arch/powerpc/kvm/book3s_hv.c

   1 /*
   2  * Copyright 2011 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com>
   3  * Copyright (C) 2009. SUSE Linux Products GmbH. All rights reserved.
   4  *
   5  * Authors:
   6  *    Paul Mackerras <paulus@au1.ibm.com>
   7  *    Alexander Graf <agraf@suse.de>
   8  *    Kevin Wolf <mail@kevin-wolf.de>
   9  *
  10  * Description: KVM functions specific to running on Book 3S
  11  * processors in hypervisor mode (specifically POWER7 and later).
  12  *
  13  * This file is derived from arch/powerpc/kvm/book3s.c,
  14  * by Alexander Graf <agraf@suse.de>.
  15  *
  16  * This program is free software; you can redistribute it and/or modify
  17  * it under the terms of the GNU General Public License, version 2, as
  18  * published by the Free Software Foundation.
  19  */
  20
  21 #include <linux/kvm_host.h>
  22 #include <linux/kernel.h>
  23 #include <linux/err.h>
  24 #include <linux/slab.h>
  25 #include <linux/preempt.h>
  26 #include <linux/sched/signal.h>
  27 #include <linux/sched/stat.h>
  28 #include <linux/delay.h>
  29 #include <linux/export.h>
  30 #include <linux/fs.h>
  31 #include <linux/anon_inodes.h>
  32 #include <linux/cpu.h>
  33 #include <linux/cpumask.h>
  34 #include <linux/spinlock.h>
  35 #include <linux/page-flags.h>
  36 #include <linux/srcu.h>
  37 #include <linux/miscdevice.h>
  38 #include <linux/debugfs.h>
  39 #include <linux/gfp.h>
  40 #include <linux/vmalloc.h>
  41 #include <linux/highmem.h>
  42 #include <linux/hugetlb.h>
  43 #include <linux/kvm_irqfd.h>
  44 #include <linux/irqbypass.h>
  45 #include <linux/module.h>
  46 #include <linux/compiler.h>
  47 #include <linux/of.h>
  48
  49 #include <asm/ftrace.h>
  50 #include <asm/reg.h>
  51 #include <asm/ppc-opcode.h>
  52 #include <asm/asm-prototypes.h>
  53 #include <asm/archrandom.h>
  54 #include <asm/debug.h>
  55 #include <asm/disassemble.h>
  56 #include <asm/cputable.h>
  57 #include <asm/cacheflush.h>
  58 #include <linux/uaccess.h>
  59 #include <asm/io.h>
  60 #include <asm/kvm_ppc.h>
  61 #include <asm/kvm_book3s.h>
  62 #include <asm/mmu_context.h>
  63 #include <asm/lppaca.h>
  64 #include <asm/processor.h>
  65 #include <asm/cputhreads.h>
  66 #include <asm/page.h>
  67 #include <asm/hvcall.h>
  68 #include <asm/switch_to.h>
  69 #include <asm/smp.h>
  70 #include <asm/dbell.h>
  71 #include <asm/hmi.h>
  72 #include <asm/pnv-pci.h>
  73 #include <asm/mmu.h>
  74 #include <asm/opal.h>
  75 #include <asm/xics.h>
  76 #include <asm/xive.h>
  77
  78 #include "book3s.h"
  79
  80 #define CREATE_TRACE_POINTS
  81 #include "trace_hv.h"
  82
  83 /* #define EXIT_DEBUG */
  84 /* #define EXIT_DEBUG_SIMPLE */
  85 /* #define EXIT_DEBUG_INT */
  86
  87 /* Used to indicate that a guest page fault needs to be handled */
  88 #define RESUME_PAGE_FAULT       (RESUME_GUEST | RESUME_FLAG_ARCH1)
  89 /* Used to indicate that a guest passthrough interrupt needs to be handled */
  90 #define RESUME_PASSTHROUGH      (RESUME_GUEST | RESUME_FLAG_ARCH2)
  91
  92 /* Used as a "null" value for timebase values */
  93 #define TB_NIL  (~(u64)0)
  94
  95 static DECLARE_BITMAP(default_enabled_hcalls, MAX_HCALL_OPCODE/4 + 1);
  96
  97 static int dynamic_mt_modes = 6;
  98 module_param(dynamic_mt_modes, int, 0644);
  99 MODULE_PARM_DESC(dynamic_mt_modes, "Set of allowed dynamic micro-threading modes: 0 (= none), 2, 4, or 6 (= 2 or 4)");
 100 static int target_smt_mode;
 101 module_param(target_smt_mode, int, 0644);
 102 MODULE_PARM_DESC(target_smt_mode, "Target threads per core (0 = max)");
 103
 104 static bool indep_threads_mode = true;
 105 module_param(indep_threads_mode, bool, S_IRUGO | S_IWUSR);
 106 MODULE_PARM_DESC(indep_threads_mode, "Independent-threads mode (only on POWER9)");
 107
 108 static bool one_vm_per_core;
 109 module_param(one_vm_per_core, bool, S_IRUGO | S_IWUSR);
 110 MODULE_PARM_DESC(one_vm_per_core, "Only run vCPUs from the same VM on a core (requires indep_threads_mode=N)");
 111
 112 #ifdef CONFIG_KVM_XICS
 113 static struct kernel_param_ops module_param_ops = {
 114         .set = param_set_int,
 115         .get = param_get_int,
 116 };
 117
 118 module_param_cb(kvm_irq_bypass, &module_param_ops, &kvm_irq_bypass, 0644);
 119 MODULE_PARM_DESC(kvm_irq_bypass, "Bypass passthrough interrupt optimization");
 120
 121 module_param_cb(h_ipi_redirect, &module_param_ops, &h_ipi_redirect, 0644);
 122 MODULE_PARM_DESC(h_ipi_redirect, "Redirect H_IPI wakeup to a free host core");
 123 #endif
 124
 125 /* If set, guests are allowed to create and control nested guests */
 126 static bool nested = true;
 127 module_param(nested, bool, S_IRUGO | S_IWUSR);
 128 MODULE_PARM_DESC(nested, "Enable nested virtualization (only on POWER9)");
 129
 130 static inline bool nesting_enabled(struct kvm *kvm)
 131 {
 132         return kvm->arch.nested_enable && kvm_is_radix(kvm);
 133 }
 134
 135 /* If set, the threads on each CPU core have to be in the same MMU mode */
 136 static bool no_mixing_hpt_and_radix;
 137
 138 static void kvmppc_end_cede(struct kvm_vcpu *vcpu);
 139 static int kvmppc_hv_setup_htab_rma(struct kvm_vcpu *vcpu);
 140
 141 /*
 142  * RWMR values for POWER8.  These control the rate at which PURR
 143  * and SPURR count and should be set according to the number of
 144  * online threads in the vcore being run.
 145  */
 146 #define RWMR_RPA_P8_1THREAD     0x164520C62609AECAUL
 147 #define RWMR_RPA_P8_2THREAD     0x7FFF2908450D8DA9UL
 148 #define RWMR_RPA_P8_3THREAD     0x164520C62609AECAUL
 149 #define RWMR_RPA_P8_4THREAD     0x199A421245058DA9UL
 150 #define RWMR_RPA_P8_5THREAD     0x164520C62609AECAUL
 151 #define RWMR_RPA_P8_6THREAD     0x164520C62609AECAUL
 152 #define RWMR_RPA_P8_7THREAD     0x164520C62609AECAUL
 153 #define RWMR_RPA_P8_8THREAD     0x164520C62609AECAUL
 154
 155 static unsigned long p8_rwmr_values[MAX_SMT_THREADS + 1] = {
 156         RWMR_RPA_P8_1THREAD,
 157         RWMR_RPA_P8_1THREAD,
 158         RWMR_RPA_P8_2THREAD,
 159         RWMR_RPA_P8_3THREAD,
 160         RWMR_RPA_P8_4THREAD,
 161         RWMR_RPA_P8_5THREAD,
 162         RWMR_RPA_P8_6THREAD,
 163         RWMR_RPA_P8_7THREAD,
 164         RWMR_RPA_P8_8THREAD,
 165 };
 166
 167 static inline struct kvm_vcpu *next_runnable_thread(struct kvmppc_vcore *vc,
 168                 int *ip)
 169 {
 170         int i = *ip;
 171         struct kvm_vcpu *vcpu;
 172
 173         while (++i < MAX_SMT_THREADS) {
 174                 vcpu = READ_ONCE(vc->runnable_threads[i]);
 175                 if (vcpu) {
 176                         *ip = i;
 177                         return vcpu;
 178                 }
 179         }
 180         return NULL;
 181 }
 182
 183 /* Used to traverse the list of runnable threads for a given vcore */
 184 #define for_each_runnable_thread(i, vcpu, vc) \
 185         for (i = -1; (vcpu = next_runnable_thread(vc, &i)); )
 186
 187 static bool kvmppc_ipi_thread(int cpu)
 188 {
 189         unsigned long msg = PPC_DBELL_TYPE(PPC_DBELL_SERVER);
 190
 191         /* If we're a nested hypervisor, fall back to ordinary IPIs for now */
 192         if (kvmhv_on_pseries())
 193                 return false;
 194
 195         /* On POWER9 we can use msgsnd to IPI any cpu */
 196         if (cpu_has_feature(CPU_FTR_ARCH_300)) {
 197                 msg |= get_hard_smp_processor_id(cpu);
 198                 smp_mb();
 199                 __asm__ __volatile__ (PPC_MSGSND(%0) : : "r" (msg));
 200                 return true;
 201         }
 202
 203         /* On POWER8 for IPIs to threads in the same core, use msgsnd */
 204         if (cpu_has_feature(CPU_FTR_ARCH_207S)) {
 205                 preempt_disable();
 206                 if (cpu_first_thread_sibling(cpu) ==
 207                     cpu_first_thread_sibling(smp_processor_id())) {
 208                         msg |= cpu_thread_in_core(cpu);
 209                         smp_mb();
 210                         __asm__ __volatile__ (PPC_MSGSND(%0) : : "r" (msg));
 211                         preempt_enable();
 212                         return true;
 213                 }
 214                 preempt_enable();
 215         }
 216
 217 #if defined(CONFIG_PPC_ICP_NATIVE) && defined(CONFIG_SMP)
 218         if (cpu >= 0 && cpu < nr_cpu_ids) {
 219                 if (paca_ptrs[cpu]->kvm_hstate.xics_phys) {
 220                         xics_wake_cpu(cpu);
 221                         return true;
 222                 }
 223                 opal_int_set_mfrr(get_hard_smp_processor_id(cpu), IPI_PRIORITY);
 224                 return true;
 225         }
 226 #endif
 227
 228         return false;
 229 }
 230
 231 static void kvmppc_fast_vcpu_kick_hv(struct kvm_vcpu *vcpu)
 232 {
 233         int cpu;
 234         struct swait_queue_head *wqp;
 235
 236         wqp = kvm_arch_vcpu_wq(vcpu);
 237         if (swq_has_sleeper(wqp)) {
 238                 swake_up_one(wqp);
 239                 ++vcpu->stat.halt_wakeup;
 240         }
 241
 242         cpu = READ_ONCE(vcpu->arch.thread_cpu);
 243         if (cpu >= 0 && kvmppc_ipi_thread(cpu))
 244                 return;
 245
 246         /* CPU points to the first thread of the core */
 247         cpu = vcpu->cpu;
 248         if (cpu >= 0 && cpu < nr_cpu_ids && cpu_online(cpu))
 249                 smp_send_reschedule(cpu);
 250 }
 251
 252 /*
 253  * We use the vcpu_load/put functions to measure stolen time.
 254  * Stolen time is counted as time when either the vcpu is able to
 255  * run as part of a virtual core, but the task running the vcore
 256  * is preempted or sleeping, or when the vcpu needs something done
 257  * in the kernel by the task running the vcpu, but that task is
 258  * preempted or sleeping.  Those two things have to be counted
 259  * separately, since one of the vcpu tasks will take on the job
 260  * of running the core, and the other vcpu tasks in the vcore will
 261  * sleep waiting for it to do that, but that sleep shouldn't count
 262  * as stolen time.
 263  *
 264  * Hence we accumulate stolen time when the vcpu can run as part of
 265  * a vcore using vc->stolen_tb, and the stolen time when the vcpu
 266  * needs its task to do other things in the kernel (for example,
 267  * service a page fault) in busy_stolen.  We don't accumulate
 268  * stolen time for a vcore when it is inactive, or for a vcpu
 269  * when it is in state RUNNING or NOTREADY.  NOTREADY is a bit of
 270  * a misnomer; it means that the vcpu task is not executing in
 271  * the KVM_VCPU_RUN ioctl, i.e. it is in userspace or elsewhere in
 272  * the kernel.  We don't have any way of dividing up that time
 273  * between time that the vcpu is genuinely stopped, time that
 274  * the task is actively working on behalf of the vcpu, and time
 275  * that the task is preempted, so we don't count any of it as
 276  * stolen.
 277  *
 278  * Updates to busy_stolen are protected by arch.tbacct_lock;
 279  * updates to vc->stolen_tb are protected by the vcore->stoltb_lock
 280  * lock.  The stolen times are measured in units of timebase ticks.
 281  * (Note that the != TB_NIL checks below are purely defensive;
 282  * they should never fail.)
 283  */
 284
 285 static void kvmppc_core_start_stolen(struct kvmppc_vcore *vc)
 286 {
 287         unsigned long flags;
 288
 289         spin_lock_irqsave(&vc->stoltb_lock, flags);
 290         vc->preempt_tb = mftb();
 291         spin_unlock_irqrestore(&vc->stoltb_lock, flags);
 292 }
 293
 294 static void kvmppc_core_end_stolen(struct kvmppc_vcore *vc)
 295 {
 296         unsigned long flags;
 297
 298         spin_lock_irqsave(&vc->stoltb_lock, flags);
 299         if (vc->preempt_tb != TB_NIL) {
 300                 vc->stolen_tb += mftb() - vc->preempt_tb;
 301                 vc->preempt_tb = TB_NIL;
 302         }
 303         spin_unlock_irqrestore(&vc->stoltb_lock, flags);
 304 }
 305
 306 static void kvmppc_core_vcpu_load_hv(struct kvm_vcpu *vcpu, int cpu)
 307 {
 308         struct kvmppc_vcore *vc = vcpu->arch.vcore;
 309         unsigned long flags;
 310
 311         /*
 312          * We can test vc->runner without taking the vcore lock,
 313          * because only this task ever sets vc->runner to this
 314          * vcpu, and once it is set to this vcpu, only this task
 315          * ever sets it to NULL.
 316          */
 317         if (vc->runner == vcpu && vc->vcore_state >= VCORE_SLEEPING)
 318                 kvmppc_core_end_stolen(vc);
 319
 320         spin_lock_irqsave(&vcpu->arch.tbacct_lock, flags);
 321         if (vcpu->arch.state == KVMPPC_VCPU_BUSY_IN_HOST &&
 322             vcpu->arch.busy_preempt != TB_NIL) {
 323                 vcpu->arch.busy_stolen += mftb() - vcpu->arch.busy_preempt;
 324                 vcpu->arch.busy_preempt = TB_NIL;
 325         }
 326         spin_unlock_irqrestore(&vcpu->arch.tbacct_lock, flags);
 327 }
 328
 329 static void kvmppc_core_vcpu_put_hv(struct kvm_vcpu *vcpu)
 330 {
 331         struct kvmppc_vcore *vc = vcpu->arch.vcore;
 332         unsigned long flags;
 333
 334         if (vc->runner == vcpu && vc->vcore_state >= VCORE_SLEEPING)
 335                 kvmppc_core_start_stolen(vc);
 336
 337         spin_lock_irqsave(&vcpu->arch.tbacct_lock, flags);
 338         if (vcpu->arch.state == KVMPPC_VCPU_BUSY_IN_HOST)
 339                 vcpu->arch.busy_preempt = mftb();
 340         spin_unlock_irqrestore(&vcpu->arch.tbacct_lock, flags);
 341 }
 342
 343 static void kvmppc_set_msr_hv(struct kvm_vcpu *vcpu, u64 msr)
 344 {
 345         /*
 346          * Check for illegal transactional state bit combination
 347          * and if we find it, force the TS field to a safe state.
 348          */
 349         if ((msr & MSR_TS_MASK) == MSR_TS_MASK)
 350                 msr &= ~MSR_TS_MASK;
 351         vcpu->arch.shregs.msr = msr;
 352         kvmppc_end_cede(vcpu);
 353 }
 354
 355 static void kvmppc_set_pvr_hv(struct kvm_vcpu *vcpu, u32 pvr)
 356 {
 357         vcpu->arch.pvr = pvr;
 358 }
 359
 360 /* Dummy value used in computing PCR value below */
 361 #define PCR_ARCH_300    (PCR_ARCH_207 << 1)
 362
 363 static int kvmppc_set_arch_compat(struct kvm_vcpu *vcpu, u32 arch_compat)
 364 {
 365         unsigned long host_pcr_bit = 0, guest_pcr_bit = 0;
 366         struct kvmppc_vcore *vc = vcpu->arch.vcore;
 367
 368         /* We can (emulate) our own architecture version and anything older */
 369         if (cpu_has_feature(CPU_FTR_ARCH_300))
 370                 host_pcr_bit = PCR_ARCH_300;
 371         else if (cpu_has_feature(CPU_FTR_ARCH_207S))
 372                 host_pcr_bit = PCR_ARCH_207;
 373         else if (cpu_has_feature(CPU_FTR_ARCH_206))
 374                 host_pcr_bit = PCR_ARCH_206;
 375         else
 376                 host_pcr_bit = PCR_ARCH_205;
 377
 378         /* Determine lowest PCR bit needed to run guest in given PVR level */
 379         guest_pcr_bit = host_pcr_bit;
 380         if (arch_compat) {
 381                 switch (arch_compat) {
 382                 case PVR_ARCH_205:
 383                         guest_pcr_bit = PCR_ARCH_205;
 384                         break;
 385                 case PVR_ARCH_206:
 386                 case PVR_ARCH_206p:
 387                         guest_pcr_bit = PCR_ARCH_206;
 388                         break;
 389                 case PVR_ARCH_207:
 390                         guest_pcr_bit = PCR_ARCH_207;
 391                         break;
 392                 case PVR_ARCH_300:
 393                         guest_pcr_bit = PCR_ARCH_300;
 394                         break;
 395                 default:
 396                         return -EINVAL;
 397                 }
 398         }
 399
 400         /* Check requested PCR bits don't exceed our capabilities */
 401         if (guest_pcr_bit > host_pcr_bit)
 402                 return -EINVAL;
 403
 404         spin_lock(&vc->lock);
 405         vc->arch_compat = arch_compat;
 406         /* Set all PCR bits for which guest_pcr_bit <= bit < host_pcr_bit */
 407         vc->pcr = host_pcr_bit - guest_pcr_bit;
 408         spin_unlock(&vc->lock);
 409
 410         return 0;
 411 }
 412
 413 static void kvmppc_dump_regs(struct kvm_vcpu *vcpu)
 414 {
 415         int r;
 416
 417         pr_err("vcpu %p (%d):\n", vcpu, vcpu->vcpu_id);
 418         pr_err("pc  = %.16lx  msr = %.16llx  trap = %x\n",
 419                vcpu->arch.regs.nip, vcpu->arch.shregs.msr, vcpu->arch.trap);
 420         for (r = 0; r < 16; ++r)
 421                 pr_err("r%2d = %.16lx  r%d = %.16lx\n",
 422                        r, kvmppc_get_gpr(vcpu, r),
 423                        r+16, kvmppc_get_gpr(vcpu, r+16));
 424         pr_err("ctr = %.16lx  lr  = %.16lx\n",
 425                vcpu->arch.regs.ctr, vcpu->arch.regs.link);
 426         pr_err("srr0 = %.16llx srr1 = %.16llx\n",
 427                vcpu->arch.shregs.srr0, vcpu->arch.shregs.srr1);
 428         pr_err("sprg0 = %.16llx sprg1 = %.16llx\n",
 429                vcpu->arch.shregs.sprg0, vcpu->arch.shregs.sprg1);
 430         pr_err("sprg2 = %.16llx sprg3 = %.16llx\n",
 431                vcpu->arch.shregs.sprg2, vcpu->arch.shregs.sprg3);
 432         pr_err("cr = %.8lx  xer = %.16lx  dsisr = %.8x\n",
 433                vcpu->arch.regs.ccr, vcpu->arch.regs.xer, vcpu->arch.shregs.dsisr);
 434         pr_err("dar = %.16llx\n", vcpu->arch.shregs.dar);
 435         pr_err("fault dar = %.16lx dsisr = %.8x\n",
 436                vcpu->arch.fault_dar, vcpu->arch.fault_dsisr);
 437         pr_err("SLB (%d entries):\n", vcpu->arch.slb_max);
 438         for (r = 0; r < vcpu->arch.slb_max; ++r)
 439                 pr_err("  ESID = %.16llx VSID = %.16llx\n",
 440                        vcpu->arch.slb[r].orige, vcpu->arch.slb[r].origv);
 441         pr_err("lpcr = %.16lx sdr1 = %.16lx last_inst = %.8x\n",
 442                vcpu->arch.vcore->lpcr, vcpu->kvm->arch.sdr1,
 443                vcpu->arch.last_inst);
 444 }
 445
 446 static struct kvm_vcpu *kvmppc_find_vcpu(struct kvm *kvm, int id)
 447 {
 448         struct kvm_vcpu *ret;
 449
 450         mutex_lock(&kvm->lock);
 451         ret = kvm_get_vcpu_by_id(kvm, id);
 452         mutex_unlock(&kvm->lock);
 453         return ret;
 454 }
 455
 456 static void init_vpa(struct kvm_vcpu *vcpu, struct lppaca *vpa)
 457 {
 458         vpa->__old_status |= LPPACA_OLD_SHARED_PROC;
 459         vpa->yield_count = cpu_to_be32(1);
 460 }
 461
 462 static int set_vpa(struct kvm_vcpu *vcpu, struct kvmppc_vpa *v,
 463                    unsigned long addr, unsigned long len)
 464 {
 465         /* check address is cacheline aligned */
 466         if (addr & (L1_CACHE_BYTES - 1))
 467                 return -EINVAL;
 468         spin_lock(&vcpu->arch.vpa_update_lock);
 469         if (v->next_gpa != addr || v->len != len) {
 470                 v->next_gpa = addr;
 471                 v->len = addr ? len : 0;
 472                 v->update_pending = 1;
 473         }
 474         spin_unlock(&vcpu->arch.vpa_update_lock);
 475         return 0;
 476 }
 477
 478 /* Length for a per-processor buffer is passed in at offset 4 in the buffer */
 479 struct reg_vpa {
 480         u32 dummy;
 481         union {
 482                 __be16 hword;
 483                 __be32 word;
 484         } length;
 485 };
 486
 487 static int vpa_is_registered(struct kvmppc_vpa *vpap)
 488 {
 489         if (vpap->update_pending)
 490                 return vpap->next_gpa != 0;
 491         return vpap->pinned_addr != NULL;
 492 }
 493
 494 static unsigned long do_h_register_vpa(struct kvm_vcpu *vcpu,
 495                                        unsigned long flags,
 496                                        unsigned long vcpuid, unsigned long vpa)
 497 {
 498         struct kvm *kvm = vcpu->kvm;
 499         unsigned long len, nb;
 500         void *va;
 501         struct kvm_vcpu *tvcpu;
 502         int err;
 503         int subfunc;
 504         struct kvmppc_vpa *vpap;
 505
 506         tvcpu = kvmppc_find_vcpu(kvm, vcpuid);
 507         if (!tvcpu)
 508                 return H_PARAMETER;
 509
 510         subfunc = (flags >> H_VPA_FUNC_SHIFT) & H_VPA_FUNC_MASK;
 511         if (subfunc == H_VPA_REG_VPA || subfunc == H_VPA_REG_DTL ||
 512             subfunc == H_VPA_REG_SLB) {
 513                 /* Registering new area - address must be cache-line aligned */
 514                 if ((vpa & (L1_CACHE_BYTES - 1)) || !vpa)
 515                         return H_PARAMETER;
 516
 517                 /* convert logical addr to kernel addr and read length */
 518                 va = kvmppc_pin_guest_page(kvm, vpa, &nb);
 519                 if (va == NULL)
 520                         return H_PARAMETER;
 521                 if (subfunc == H_VPA_REG_VPA)
 522                         len = be16_to_cpu(((struct reg_vpa *)va)->length.hword);
 523                 else
 524                         len = be32_to_cpu(((struct reg_vpa *)va)->length.word);
 525                 kvmppc_unpin_guest_page(kvm, va, vpa, false);
 526
 527                 /* Check length */
 528                 if (len > nb || len < sizeof(struct reg_vpa))
 529                         return H_PARAMETER;
 530         } else {
 531                 vpa = 0;
 532                 len = 0;
 533         }
 534
 535         err = H_PARAMETER;
 536         vpap = NULL;
 537         spin_lock(&tvcpu->arch.vpa_update_lock);
 538
 539         switch (subfunc) {
 540         case H_VPA_REG_VPA:             /* register VPA */
 541                 /*
 542                  * The size of our lppaca is 1kB because of the way we align
 543                  * it for the guest to avoid crossing a 4kB boundary. We only
 544                  * use 640 bytes of the structure though, so we should accept
 545                  * clients that set a size of 640.
 546                  */
 547                 BUILD_BUG_ON(sizeof(struct lppaca) != 640);
 548                 if (len < sizeof(struct lppaca))
 549                         break;
 550                 vpap = &tvcpu->arch.vpa;
 551                 err = 0;
 552                 break;
 553
 554         case H_VPA_REG_DTL:             /* register DTL */
 555                 if (len < sizeof(struct dtl_entry))
 556                         break;
 557                 len -= len % sizeof(struct dtl_entry);
 558
 559                 /* Check that they have previously registered a VPA */
 560                 err = H_RESOURCE;
 561                 if (!vpa_is_registered(&tvcpu->arch.vpa))
 562                         break;
 563
 564                 vpap = &tvcpu->arch.dtl;
 565                 err = 0;
 566                 break;
 567
 568         case H_VPA_REG_SLB:             /* register SLB shadow buffer */
 569                 /* Check that they have previously registered a VPA */
 570                 err = H_RESOURCE;
 571                 if (!vpa_is_registered(&tvcpu->arch.vpa))
 572                         break;
 573
 574                 vpap = &tvcpu->arch.slb_shadow;
 575                 err = 0;
 576                 break;
 577
 578         case H_VPA_DEREG_VPA:           /* deregister VPA */
 579                 /* Check they don't still have a DTL or SLB buf registered */
 580                 err = H_RESOURCE;
 581                 if (vpa_is_registered(&tvcpu->arch.dtl) ||
 582                     vpa_is_registered(&tvcpu->arch.slb_shadow))
 583                         break;
 584
 585                 vpap = &tvcpu->arch.vpa;
 586                 err = 0;
 587                 break;
 588
 589         case H_VPA_DEREG_DTL:           /* deregister DTL */
 590                 vpap = &tvcpu->arch.dtl;
 591                 err = 0;
 592                 break;
 593
 594         case H_VPA_DEREG_SLB:           /* deregister SLB shadow buffer */
 595                 vpap = &tvcpu->arch.slb_shadow;
 596                 err = 0;
 597                 break;
 598         }
 599
 600         if (vpap) {
 601                 vpap->next_gpa = vpa;
 602                 vpap->len = len;
 603                 vpap->update_pending = 1;
 604         }
 605
 606         spin_unlock(&tvcpu->arch.vpa_update_lock);
 607
 608         return err;
 609 }
 610
 611 static void kvmppc_update_vpa(struct kvm_vcpu *vcpu, struct kvmppc_vpa *vpap)
 612 {
 613         struct kvm *kvm = vcpu->kvm;
 614         void *va;
 615         unsigned long nb;
 616         unsigned long gpa;
 617
 618         /*
 619          * We need to pin the page pointed to by vpap->next_gpa,
 620          * but we can't call kvmppc_pin_guest_page under the lock
 621          * as it does get_user_pages() and down_read().  So we
 622          * have to drop the lock, pin the page, then get the lock
 623          * again and check that a new area didn't get registered
 624          * in the meantime.
 625          */
 626         for (;;) {
 627                 gpa = vpap->next_gpa;
 628                 spin_unlock(&vcpu->arch.vpa_update_lock);
 629                 va = NULL;
 630                 nb = 0;
 631                 if (gpa)
 632                         va = kvmppc_pin_guest_page(kvm, gpa, &nb);
 633                 spin_lock(&vcpu->arch.vpa_update_lock);
 634                 if (gpa == vpap->next_gpa)
 635                         break;
 636                 /* sigh... unpin that one and try again */
 637                 if (va)
 638                         kvmppc_unpin_guest_page(kvm, va, gpa, false);
 639         }
 640
 641         vpap->update_pending = 0;
 642         if (va && nb < vpap->len) {
 643                 /*
 644                  * If it's now too short, it must be that userspace
 645                  * has changed the mappings underlying guest memory,
 646                  * so unregister the region.
 647                  */
 648                 kvmppc_unpin_guest_page(kvm, va, gpa, false);
 649                 va = NULL;
 650         }
 651         if (vpap->pinned_addr)
 652                 kvmppc_unpin_guest_page(kvm, vpap->pinned_addr, vpap->gpa,
 653                                         vpap->dirty);
 654         vpap->gpa = gpa;
 655         vpap->pinned_addr = va;
 656         vpap->dirty = false;
 657         if (va)
 658                 vpap->pinned_end = va + vpap->len;
 659 }
 660
 661 static void kvmppc_update_vpas(struct kvm_vcpu *vcpu)
 662 {
 663         if (!(vcpu->arch.vpa.update_pending ||
 664               vcpu->arch.slb_shadow.update_pending ||
 665               vcpu->arch.dtl.update_pending))
 666                 return;
 667
 668         spin_lock(&vcpu->arch.vpa_update_lock);
 669         if (vcpu->arch.vpa.update_pending) {
 670                 kvmppc_update_vpa(vcpu, &vcpu->arch.vpa);
 671                 if (vcpu->arch.vpa.pinned_addr)
 672                         init_vpa(vcpu, vcpu->arch.vpa.pinned_addr);
 673         }
 674         if (vcpu->arch.dtl.update_pending) {
 675                 kvmppc_update_vpa(vcpu, &vcpu->arch.dtl);
 676                 vcpu->arch.dtl_ptr = vcpu->arch.dtl.pinned_addr;
 677                 vcpu->arch.dtl_index = 0;
 678         }
 679         if (vcpu->arch.slb_shadow.update_pending)
 680                 kvmppc_update_vpa(vcpu, &vcpu->arch.slb_shadow);
 681         spin_unlock(&vcpu->arch.vpa_update_lock);
 682 }
 683
 684 /*
 685  * Return the accumulated stolen time for the vcore up until `now'.
 686  * The caller should hold the vcore lock.
 687  */
 688 static u64 vcore_stolen_time(struct kvmppc_vcore *vc, u64 now)
 689 {
 690         u64 p;
 691         unsigned long flags;
 692
 693         spin_lock_irqsave(&vc->stoltb_lock, flags);
 694         p = vc->stolen_tb;
 695         if (vc->vcore_state != VCORE_INACTIVE &&
 696             vc->preempt_tb != TB_NIL)
 697                 p += now - vc->preempt_tb;
 698         spin_unlock_irqrestore(&vc->stoltb_lock, flags);
 699         return p;
 700 }
 701
 702 static void kvmppc_create_dtl_entry(struct kvm_vcpu *vcpu,
 703                                     struct kvmppc_vcore *vc)
 704 {
 705         struct dtl_entry *dt;
 706         struct lppaca *vpa;
 707         unsigned long stolen;
 708         unsigned long core_stolen;
 709         u64 now;
 710         unsigned long flags;
 711
 712         dt = vcpu->arch.dtl_ptr;
 713         vpa = vcpu->arch.vpa.pinned_addr;
 714         now = mftb();
 715         core_stolen = vcore_stolen_time(vc, now);
 716         stolen = core_stolen - vcpu->arch.stolen_logged;
 717         vcpu->arch.stolen_logged = core_stolen;
 718         spin_lock_irqsave(&vcpu->arch.tbacct_lock, flags);
 719         stolen += vcpu->arch.busy_stolen;
 720         vcpu->arch.busy_stolen = 0;
 721         spin_unlock_irqrestore(&vcpu->arch.tbacct_lock, flags);
 722         if (!dt || !vpa)
 723                 return;
 724         memset(dt, 0, sizeof(struct dtl_entry));
 725         dt->dispatch_reason = 7;
 726         dt->processor_id = cpu_to_be16(vc->pcpu + vcpu->arch.ptid);
 727         dt->timebase = cpu_to_be64(now + vc->tb_offset);
 728         dt->enqueue_to_dispatch_time = cpu_to_be32(stolen);
 729         dt->srr0 = cpu_to_be64(kvmppc_get_pc(vcpu));
 730         dt->srr1 = cpu_to_be64(vcpu->arch.shregs.msr);
 731         ++dt;
 732         if (dt == vcpu->arch.dtl.pinned_end)
 733                 dt = vcpu->arch.dtl.pinned_addr;
 734         vcpu->arch.dtl_ptr = dt;
 735         /* order writing *dt vs. writing vpa->dtl_idx */
 736         smp_wmb();
 737         vpa->dtl_idx = cpu_to_be64(++vcpu->arch.dtl_index);
 738         vcpu->arch.dtl.dirty = true;
 739 }
 740
 741 /* See if there is a doorbell interrupt pending for a vcpu */
 742 static bool kvmppc_doorbell_pending(struct kvm_vcpu *vcpu)
 743 {
 744         int thr;
 745         struct kvmppc_vcore *vc;
 746
 747         if (vcpu->arch.doorbell_request)
 748                 return true;
 749         /*
 750          * Ensure that the read of vcore->dpdes comes after the read
 751          * of vcpu->doorbell_request.  This barrier matches the
 752          * smb_wmb() in kvmppc_guest_entry_inject().
 753          */
 754         smp_rmb();
 755         vc = vcpu->arch.vcore;
 756         thr = vcpu->vcpu_id - vc->first_vcpuid;
 757         return !!(vc->dpdes & (1 << thr));
 758 }
 759
 760 static bool kvmppc_power8_compatible(struct kvm_vcpu *vcpu)
 761 {
 762         if (vcpu->arch.vcore->arch_compat >= PVR_ARCH_207)
 763                 return true;
 764         if ((!vcpu->arch.vcore->arch_compat) &&
 765             cpu_has_feature(CPU_FTR_ARCH_207S))
 766                 return true;
 767         return false;
 768 }
 769
 770 static int kvmppc_h_set_mode(struct kvm_vcpu *vcpu, unsigned long mflags,
 771                              unsigned long resource, unsigned long value1,
 772                              unsigned long value2)
 773 {
 774         switch (resource) {
 775         case H_SET_MODE_RESOURCE_SET_CIABR:
 776                 if (!kvmppc_power8_compatible(vcpu))
 777                         return H_P2;
 778                 if (value2)
 779                         return H_P4;
 780                 if (mflags)
 781                         return H_UNSUPPORTED_FLAG_START;
 782                 /* Guests can't breakpoint the hypervisor */
 783                 if ((value1 & CIABR_PRIV) == CIABR_PRIV_HYPER)
 784                         return H_P3;
 785                 vcpu->arch.ciabr  = value1;
 786                 return H_SUCCESS;
 787         case H_SET_MODE_RESOURCE_SET_DAWR:
 788                 if (!kvmppc_power8_compatible(vcpu))
 789                         return H_P2;
 790                 if (!ppc_breakpoint_available())
 791                         return H_P2;
 792                 if (mflags)
 793                         return H_UNSUPPORTED_FLAG_START;
 794                 if (value2 & DABRX_HYP)
 795                         return H_P4;
 796                 vcpu->arch.dawr  = value1;
 797                 vcpu->arch.dawrx = value2;
 798                 return H_SUCCESS;
 799         default:
 800                 return H_TOO_HARD;
 801         }
 802 }
 803
 804 static int kvm_arch_vcpu_yield_to(struct kvm_vcpu *target)
 805 {
 806         struct kvmppc_vcore *vcore = target->arch.vcore;
 807
 808         /*
 809          * We expect to have been called by the real mode handler
 810          * (kvmppc_rm_h_confer()) which would have directly returned
 811          * H_SUCCESS if the source vcore wasn't idle (e.g. if it may
 812          * have useful work to do and should not confer) so we don't
 813          * recheck that here.
 814          */
 815
 816         spin_lock(&vcore->lock);
 817         if (target->arch.state == KVMPPC_VCPU_RUNNABLE &&
 818             vcore->vcore_state != VCORE_INACTIVE &&
 819             vcore->runner)
 820                 target = vcore->runner;
 821         spin_unlock(&vcore->lock);
 822
 823         return kvm_vcpu_yield_to(target);
 824 }
 825
 826 static int kvmppc_get_yield_count(struct kvm_vcpu *vcpu)
 827 {
 828         int yield_count = 0;
 829         struct lppaca *lppaca;
 830
 831         spin_lock(&vcpu->arch.vpa_update_lock);
 832         lppaca = (struct lppaca *)vcpu->arch.vpa.pinned_addr;
 833         if (lppaca)
 834                 yield_count = be32_to_cpu(lppaca->yield_count);
 835         spin_unlock(&vcpu->arch.vpa_update_lock);
 836         return yield_count;
 837 }
 838
 839 int kvmppc_pseries_do_hcall(struct kvm_vcpu *vcpu)
 840 {
 841         unsigned long req = kvmppc_get_gpr(vcpu, 3);
 842         unsigned long target, ret = H_SUCCESS;
 843         int yield_count;
 844         struct kvm_vcpu *tvcpu;
 845         int idx, rc;
 846
 847         if (req <= MAX_HCALL_OPCODE &&
 848             !test_bit(req/4, vcpu->kvm->arch.enabled_hcalls))
 849                 return RESUME_HOST;
 850
 851         switch (req) {
 852         case H_CEDE:
 853                 break;
 854         case H_PROD:
 855                 target = kvmppc_get_gpr(vcpu, 4);
 856                 tvcpu = kvmppc_find_vcpu(vcpu->kvm, target);
 857                 if (!tvcpu) {
 858                         ret = H_PARAMETER;
 859                         break;
 860                 }
 861                 tvcpu->arch.prodded = 1;
 862                 smp_mb();
 863                 if (tvcpu->arch.ceded)
 864                         kvmppc_fast_vcpu_kick_hv(tvcpu);
 865                 break;
 866         case H_CONFER:
 867                 target = kvmppc_get_gpr(vcpu, 4);
 868                 if (target == -1)
 869                         break;
 870                 tvcpu = kvmppc_find_vcpu(vcpu->kvm, target);
 871                 if (!tvcpu) {
 872                         ret = H_PARAMETER;
 873                         break;
 874                 }
 875                 yield_count = kvmppc_get_gpr(vcpu, 5);
 876                 if (kvmppc_get_yield_count(tvcpu) != yield_count)
 877                         break;
 878                 kvm_arch_vcpu_yield_to(tvcpu);
 879                 break;
 880         case H_REGISTER_VPA:
 881                 ret = do_h_register_vpa(vcpu, kvmppc_get_gpr(vcpu, 4),
 882                                         kvmppc_get_gpr(vcpu, 5),
 883                                         kvmppc_get_gpr(vcpu, 6));
 884                 break;
 885         case H_RTAS:
 886                 if (list_empty(&vcpu->kvm->arch.rtas_tokens))
 887                         return RESUME_HOST;
 888
 889                 idx = srcu_read_lock(&vcpu->kvm->srcu);
 890                 rc = kvmppc_rtas_hcall(vcpu);
 891                 srcu_read_unlock(&vcpu->kvm->srcu, idx);
 892
 893                 if (rc == -ENOENT)
 894                         return RESUME_HOST;
 895                 else if (rc == 0)
 896                         break;
 897
 898                 /* Send the error out to userspace via KVM_RUN */
 899                 return rc;
 900         case H_LOGICAL_CI_LOAD:
 901                 ret = kvmppc_h_logical_ci_load(vcpu);
 902                 if (ret == H_TOO_HARD)
 903                         return RESUME_HOST;
 904                 break;
 905         case H_LOGICAL_CI_STORE:
 906                 ret = kvmppc_h_logical_ci_store(vcpu);
 907                 if (ret == H_TOO_HARD)
 908                         return RESUME_HOST;
 909                 break;
 910         case H_SET_MODE:
 911                 ret = kvmppc_h_set_mode(vcpu, kvmppc_get_gpr(vcpu, 4),
 912                                         kvmppc_get_gpr(vcpu, 5),
 913                                         kvmppc_get_gpr(vcpu, 6),
 914                                         kvmppc_get_gpr(vcpu, 7));
 915                 if (ret == H_TOO_HARD)
 916                         return RESUME_HOST;
 917                 break;
 918         case H_XIRR:
 919         case H_CPPR:
 920         case H_EOI:
 921         case H_IPI:
 922         case H_IPOLL:
 923         case H_XIRR_X:
 924                 if (kvmppc_xics_enabled(vcpu)) {
 925                         if (xive_enabled()) {
 926                                 ret = H_NOT_AVAILABLE;
 927                                 return RESUME_GUEST;
 928                         }
 929                         ret = kvmppc_xics_hcall(vcpu, req);
 930                         break;
 931                 }
 932                 return RESUME_HOST;
 933         case H_SET_DABR:
 934                 ret = kvmppc_h_set_dabr(vcpu, kvmppc_get_gpr(vcpu, 4));
 935                 break;
 936         case H_SET_XDABR:
 937                 ret = kvmppc_h_set_xdabr(vcpu, kvmppc_get_gpr(vcpu, 4),
 938                                                 kvmppc_get_gpr(vcpu, 5));
 939                 break;
 940         case H_GET_TCE:
 941                 ret = kvmppc_h_get_tce(vcpu, kvmppc_get_gpr(vcpu, 4),
 942                                                 kvmppc_get_gpr(vcpu, 5));
 943                 if (ret == H_TOO_HARD)
 944                         return RESUME_HOST;
 945                 break;
 946         case H_PUT_TCE:
 947                 ret = kvmppc_h_put_tce(vcpu, kvmppc_get_gpr(vcpu, 4),
 948                                                 kvmppc_get_gpr(vcpu, 5),
 949                                                 kvmppc_get_gpr(vcpu, 6));
 950                 if (ret == H_TOO_HARD)
 951                         return RESUME_HOST;
 952                 break;
 953         case H_PUT_TCE_INDIRECT:
 954                 ret = kvmppc_h_put_tce_indirect(vcpu, kvmppc_get_gpr(vcpu, 4),
 955                                                 kvmppc_get_gpr(vcpu, 5),
 956                                                 kvmppc_get_gpr(vcpu, 6),
 957                                                 kvmppc_get_gpr(vcpu, 7));
 958                 if (ret == H_TOO_HARD)
 959                         return RESUME_HOST;
 960                 break;
 961         case H_STUFF_TCE:
 962                 ret = kvmppc_h_stuff_tce(vcpu, kvmppc_get_gpr(vcpu, 4),
 963                                                 kvmppc_get_gpr(vcpu, 5),
 964                                                 kvmppc_get_gpr(vcpu, 6),
 965                                                 kvmppc_get_gpr(vcpu, 7));
 966                 if (ret == H_TOO_HARD)
 967                         return RESUME_HOST;
 968                 break;
 969         case H_RANDOM:
 970                 if (!powernv_get_random_long(&vcpu->arch.regs.gpr[4]))
 971                         ret = H_HARDWARE;
 972                 break;
 973
 974         case H_SET_PARTITION_TABLE:
 975                 ret = H_FUNCTION;
 976                 if (nesting_enabled(vcpu->kvm))
 977                         ret = kvmhv_set_partition_table(vcpu);
 978                 break;
 979         case H_ENTER_NESTED:
 980                 ret = H_FUNCTION;
 981                 if (!nesting_enabled(vcpu->kvm))
 982                         break;
 983                 ret = kvmhv_enter_nested_guest(vcpu);
 984                 if (ret == H_INTERRUPT) {
 985                         kvmppc_set_gpr(vcpu, 3, 0);
 986                         return -EINTR;
 987                 }
 988                 break;
 989         case H_TLB_INVALIDATE:
 990                 ret = H_FUNCTION;
 991                 if (nesting_enabled(vcpu->kvm))
 992                         ret = kvmhv_do_nested_tlbie(vcpu);
 993                 break;
 994
 995         default:
 996                 return RESUME_HOST;
 997         }
 998         kvmppc_set_gpr(vcpu, 3, ret);
 999         vcpu->arch.hcall_needed = 0;
1000         return RESUME_GUEST;
1001 }
1002
1003 /*
1004  * Handle H_CEDE in the nested virtualization case where we haven't
1005  * called the real-mode hcall handlers in book3s_hv_rmhandlers.S.
1006  * This has to be done early, not in kvmppc_pseries_do_hcall(), so
1007  * that the cede logic in kvmppc_run_single_vcpu() works properly.
1008  */
1009 static void kvmppc_nested_cede(struct kvm_vcpu *vcpu)
1010 {
1011         vcpu->arch.shregs.msr |= MSR_EE;
1012         vcpu->arch.ceded = 1;
1013         smp_mb();
1014         if (vcpu->arch.prodded) {
1015                 vcpu->arch.prodded = 0;
1016                 smp_mb();
1017                 vcpu->arch.ceded = 0;
1018         }
1019 }
1020
1021 static int kvmppc_hcall_impl_hv(unsigned long cmd)
1022 {
1023         switch (cmd) {
1024         case H_CEDE:
1025         case H_PROD:
1026         case H_CONFER:
1027         case H_REGISTER_VPA:
1028         case H_SET_MODE:
1029         case H_LOGICAL_CI_LOAD:
1030         case H_LOGICAL_CI_STORE:
1031 #ifdef CONFIG_KVM_XICS
1032         case H_XIRR:
1033         case H_CPPR:
1034         case H_EOI:
1035         case H_IPI:
1036         case H_IPOLL:
1037         case H_XIRR_X:
1038 #endif
1039                 return 1;
1040         }
1041
1042         /* See if it's in the real-mode table */
1043         return kvmppc_hcall_impl_hv_realmode(cmd);
1044 }
1045
1046 static int kvmppc_emulate_debug_inst(struct kvm_run *run,
1047                                         struct kvm_vcpu *vcpu)
1048 {
1049         u32 last_inst;
1050
1051         if (kvmppc_get_last_inst(vcpu, INST_GENERIC, &last_inst) !=
1052                                         EMULATE_DONE) {
1053                 /*
1054                  * Fetch failed, so return to guest and
1055                  * try executing it again.
1056                  */
1057                 return RESUME_GUEST;
1058         }
1059
1060         if (last_inst == KVMPPC_INST_SW_BREAKPOINT) {
1061                 run->exit_reason = KVM_EXIT_DEBUG;
1062                 run->debug.arch.address = kvmppc_get_pc(vcpu);
1063                 return RESUME_HOST;
1064         } else {
1065                 kvmppc_core_queue_program(vcpu, SRR1_PROGILL);
1066                 return RESUME_GUEST;
1067         }
1068 }
1069
1070 static void do_nothing(void *x)
1071 {
1072 }
1073
1074 static unsigned long kvmppc_read_dpdes(struct kvm_vcpu *vcpu)
1075 {
1076         int thr, cpu, pcpu, nthreads;
1077         struct kvm_vcpu *v;
1078         unsigned long dpdes;
1079
1080         nthreads = vcpu->kvm->arch.emul_smt_mode;
1081         dpdes = 0;
1082         cpu = vcpu->vcpu_id & ~(nthreads - 1);
1083         for (thr = 0; thr < nthreads; ++thr, ++cpu) {
1084                 v = kvmppc_find_vcpu(vcpu->kvm, cpu);
1085                 if (!v)
1086                         continue;
1087                 /*
1088                  * If the vcpu is currently running on a physical cpu thread,
1089                  * interrupt it in order to pull it out of the guest briefly,
1090                  * which will update its vcore->dpdes value.
1091                  */
1092                 pcpu = READ_ONCE(v->cpu);
1093                 if (pcpu >= 0)
1094                         smp_call_function_single(pcpu, do_nothing, NULL, 1);
1095                 if (kvmppc_doorbell_pending(v))
1096                         dpdes |= 1 << thr;
1097         }
1098         return dpdes;
1099 }
1100
1101 /*
1102  * On POWER9, emulate doorbell-related instructions in order to
1103  * give the guest the illusion of running on a multi-threaded core.
1104  * The instructions emulated are msgsndp, msgclrp, mfspr TIR,
1105  * and mfspr DPDES.
1106  */
1107 static int kvmppc_emulate_doorbell_instr(struct kvm_vcpu *vcpu)
1108 {
1109         u32 inst, rb, thr;
1110         unsigned long arg;
1111         struct kvm *kvm = vcpu->kvm;
1112         struct kvm_vcpu *tvcpu;
1113
1114         if (kvmppc_get_last_inst(vcpu, INST_GENERIC, &inst) != EMULATE_DONE)
1115                 return RESUME_GUEST;
1116         if (get_op(inst) != 31)
1117                 return EMULATE_FAIL;
1118         rb = get_rb(inst);
1119         thr = vcpu->vcpu_id & (kvm->arch.emul_smt_mode - 1);
1120         switch (get_xop(inst)) {
1121         case OP_31_XOP_MSGSNDP:
1122                 arg = kvmppc_get_gpr(vcpu, rb);
1123                 if (((arg >> 27) & 0xf) != PPC_DBELL_SERVER)
1124                         break;
1125                 arg &= 0x3f;
1126                 if (arg >= kvm->arch.emul_smt_mode)
1127                         break;
1128                 tvcpu = kvmppc_find_vcpu(kvm, vcpu->vcpu_id - thr + arg);
1129                 if (!tvcpu)
1130                         break;
1131                 if (!tvcpu->arch.doorbell_request) {
1132                         tvcpu->arch.doorbell_request = 1;
1133                         kvmppc_fast_vcpu_kick_hv(tvcpu);
1134                 }
1135                 break;
1136         case OP_31_XOP_MSGCLRP:
1137                 arg = kvmppc_get_gpr(vcpu, rb);
1138                 if (((arg >> 27) & 0xf) != PPC_DBELL_SERVER)
1139                         break;
1140                 vcpu->arch.vcore->dpdes = 0;
1141                 vcpu->arch.doorbell_request = 0;
1142                 break;
1143         case OP_31_XOP_MFSPR:
1144                 switch (get_sprn(inst)) {
1145                 case SPRN_TIR:
1146                         arg = thr;
1147                         break;
1148                 case SPRN_DPDES:
1149                         arg = kvmppc_read_dpdes(vcpu);
1150                         break;
1151                 default:
1152                         return EMULATE_FAIL;
1153                 }
1154                 kvmppc_set_gpr(vcpu, get_rt(inst), arg);
1155                 break;
1156         default:
1157                 return EMULATE_FAIL;
1158         }
1159         kvmppc_set_pc(vcpu, kvmppc_get_pc(vcpu) + 4);
1160         return RESUME_GUEST;
1161 }
1162
1163 static int kvmppc_handle_exit_hv(struct kvm_run *run, struct kvm_vcpu *vcpu,
1164                                  struct task_struct *tsk)
1165 {
1166         int r = RESUME_HOST;
1167
1168         vcpu->stat.sum_exits++;
1169
1170         /*
1171          * This can happen if an interrupt occurs in the last stages
1172          * of guest entry or the first stages of guest exit (i.e. after
1173          * setting paca->kvm_hstate.in_guest to KVM_GUEST_MODE_GUEST_HV
1174          * and before setting it to KVM_GUEST_MODE_HOST_HV).
1175          * That can happen due to a bug, or due to a machine check
1176          * occurring at just the wrong time.
1177          */
1178         if (vcpu->arch.shregs.msr & MSR_HV) {
1179                 printk(KERN_EMERG "KVM trap in HV mode!\n");
1180                 printk(KERN_EMERG "trap=0x%x | pc=0x%lx | msr=0x%llx\n",
1181                         vcpu->arch.trap, kvmppc_get_pc(vcpu),
1182                         vcpu->arch.shregs.msr);
1183                 kvmppc_dump_regs(vcpu);
1184                 run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
1185                 run->hw.hardware_exit_reason = vcpu->arch.trap;
1186                 return RESUME_HOST;
1187         }
1188         run->exit_reason = KVM_EXIT_UNKNOWN;
1189         run->ready_for_interrupt_injection = 1;
1190         switch (vcpu->arch.trap) {
1191         /* We're good on these - the host merely wanted to get our attention */
1192         case BOOK3S_INTERRUPT_HV_DECREMENTER:
1193                 vcpu->stat.dec_exits++;
1194                 r = RESUME_GUEST;
1195                 break;
1196         case BOOK3S_INTERRUPT_EXTERNAL:
1197         case BOOK3S_INTERRUPT_H_DOORBELL:
1198         case BOOK3S_INTERRUPT_H_VIRT:
1199                 vcpu->stat.ext_intr_exits++;
1200                 r = RESUME_GUEST;
1201                 break;
1202         /* SR/HMI/PMI are HV interrupts that host has handled. Resume guest.*/
1203         case BOOK3S_INTERRUPT_HMI:
1204         case BOOK3S_INTERRUPT_PERFMON:
1205         case BOOK3S_INTERRUPT_SYSTEM_RESET:
1206                 r = RESUME_GUEST;
1207                 break;
1208         case BOOK3S_INTERRUPT_MACHINE_CHECK:
1209                 /* Exit to guest with KVM_EXIT_NMI as exit reason */
1210                 run->exit_reason = KVM_EXIT_NMI;
1211                 run->hw.hardware_exit_reason = vcpu->arch.trap;
1212                 /* Clear out the old NMI status from run->flags */
1213                 run->flags &= ~KVM_RUN_PPC_NMI_DISP_MASK;
1214                 /* Now set the NMI status */
1215                 if (vcpu->arch.mce_evt.disposition == MCE_DISPOSITION_RECOVERED)
1216                         run->flags |= KVM_RUN_PPC_NMI_DISP_FULLY_RECOV;
1217                 else
1218                         run->flags |= KVM_RUN_PPC_NMI_DISP_NOT_RECOV;
1219
1220                 r = RESUME_HOST;
1221                 /* Print the MCE event to host console. */
1222                 machine_check_print_event_info(&vcpu->arch.mce_evt, false);
1223                 break;
1224         case BOOK3S_INTERRUPT_PROGRAM:
1225         {
1226                 ulong flags;
1227                 /*
1228                  * Normally program interrupts are delivered directly
1229                  * to the guest by the hardware, but we can get here
1230                  * as a result of a hypervisor emulation interrupt
1231                  * (e40) getting turned into a 700 by BML RTAS.
1232                  */
1233                 flags = vcpu->arch.shregs.msr & 0x1f0000ull;
1234                 kvmppc_core_queue_program(vcpu, flags);
1235                 r = RESUME_GUEST;
1236                 break;
1237         }
1238         case BOOK3S_INTERRUPT_SYSCALL:
1239         {
1240                 /* hcall - punt to userspace */
1241                 int i;
1242
1243                 /* hypercall with MSR_PR has already been handled in rmode,
1244                  * and never reaches here.
1245                  */
1246
1247                 run->papr_hcall.nr = kvmppc_get_gpr(vcpu, 3);
1248                 for (i = 0; i < 9; ++i)
1249                         run->papr_hcall.args[i] = kvmppc_get_gpr(vcpu, 4 + i);
1250                 run->exit_reason = KVM_EXIT_PAPR_HCALL;
1251                 vcpu->arch.hcall_needed = 1;
1252                 r = RESUME_HOST;
1253                 break;
1254         }
1255         /*
1256          * We get these next two if the guest accesses a page which it thinks
1257          * it has mapped but which is not actually present, either because
1258          * it is for an emulated I/O device or because the corresonding
1259          * host page has been paged out.  Any other HDSI/HISI interrupts
1260          * have been handled already.
1261          */
1262         case BOOK3S_INTERRUPT_H_DATA_STORAGE:
1263                 r = RESUME_PAGE_FAULT;
1264                 break;
1265         case BOOK3S_INTERRUPT_H_INST_STORAGE:
1266                 vcpu->arch.fault_dar = kvmppc_get_pc(vcpu);
1267                 vcpu->arch.fault_dsisr = vcpu->arch.shregs.msr &
1268                         DSISR_SRR1_MATCH_64S;
1269                 if (vcpu->arch.shregs.msr & HSRR1_HISI_WRITE)
1270                         vcpu->arch.fault_dsisr |= DSISR_ISSTORE;
1271                 r = RESUME_PAGE_FAULT;
1272                 break;
1273         /*
1274          * This occurs if the guest executes an illegal instruction.
1275          * If the guest debug is disabled, generate a program interrupt
1276          * to the guest. If guest debug is enabled, we need to check
1277          * whether the instruction is a software breakpoint instruction.
1278          * Accordingly return to Guest or Host.
1279          */
1280         case BOOK3S_INTERRUPT_H_EMUL_ASSIST:
1281                 if (vcpu->arch.emul_inst != KVM_INST_FETCH_FAILED)
1282                         vcpu->arch.last_inst = kvmppc_need_byteswap(vcpu) ?
1283                                 swab32(vcpu->arch.emul_inst) :
1284                                 vcpu->arch.emul_inst;
1285                 if (vcpu->guest_debug & KVM_GUESTDBG_USE_SW_BP) {
1286                         r = kvmppc_emulate_debug_inst(run, vcpu);
1287                 } else {
1288                         kvmppc_core_queue_program(vcpu, SRR1_PROGILL);
1289                         r = RESUME_GUEST;
1290                 }
1291                 break;
1292         /*
1293          * This occurs if the guest (kernel or userspace), does something that
1294          * is prohibited by HFSCR.
1295          * On POWER9, this could be a doorbell instruction that we need
1296          * to emulate.
1297          * Otherwise, we just generate a program interrupt to the guest.
1298          */
1299         case BOOK3S_INTERRUPT_H_FAC_UNAVAIL:
1300                 r = EMULATE_FAIL;
1301                 if (((vcpu->arch.hfscr >> 56) == FSCR_MSGP_LG) &&
1302                     cpu_has_feature(CPU_FTR_ARCH_300))
1303                         r = kvmppc_emulate_doorbell_instr(vcpu);
1304                 if (r == EMULATE_FAIL) {
1305                         kvmppc_core_queue_program(vcpu, SRR1_PROGILL);
1306                         r = RESUME_GUEST;
1307                 }
1308                 break;
1309
1310 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1311         case BOOK3S_INTERRUPT_HV_SOFTPATCH:
1312                 /*
1313                  * This occurs for various TM-related instructions that
1314                  * we need to emulate on POWER9 DD2.2.  We have already
1315                  * handled the cases where the guest was in real-suspend
1316                  * mode and was transitioning to transactional state.
1317                  */
1318                 r = kvmhv_p9_tm_emulation(vcpu);
1319                 break;
1320 #endif
1321
1322         case BOOK3S_INTERRUPT_HV_RM_HARD:
1323                 r = RESUME_PASSTHROUGH;
1324                 break;
1325         default:
1326                 kvmppc_dump_regs(vcpu);
1327                 printk(KERN_EMERG "trap=0x%x | pc=0x%lx | msr=0x%llx\n",
1328                         vcpu->arch.trap, kvmppc_get_pc(vcpu),
1329                         vcpu->arch.shregs.msr);
1330                 run->hw.hardware_exit_reason = vcpu->arch.trap;
1331                 r = RESUME_HOST;
1332                 break;
1333         }
1334
1335         return r;
1336 }
1337
1338 static int kvmppc_handle_nested_exit(struct kvm_vcpu *vcpu)
1339 {
1340         int r;
1341         int srcu_idx;
1342
1343         vcpu->stat.sum_exits++;
1344
1345         /*
1346          * This can happen if an interrupt occurs in the last stages
1347          * of guest entry or the first stages of guest exit (i.e. after
1348          * setting paca->kvm_hstate.in_guest to KVM_GUEST_MODE_GUEST_HV
1349          * and before setting it to KVM_GUEST_MODE_HOST_HV).
1350          * That can happen due to a bug, or due to a machine check
1351          * occurring at just the wrong time.
1352          */
1353         if (vcpu->arch.shregs.msr & MSR_HV) {
1354                 pr_emerg("KVM trap in HV mode while nested!\n");
1355                 pr_emerg("trap=0x%x | pc=0x%lx | msr=0x%llx\n",
1356                          vcpu->arch.trap, kvmppc_get_pc(vcpu),
1357                          vcpu->arch.shregs.msr);
1358                 kvmppc_dump_regs(vcpu);
1359                 return RESUME_HOST;
1360         }
1361         switch (vcpu->arch.trap) {
1362         /* We're good on these - the host merely wanted to get our attention */
1363         case BOOK3S_INTERRUPT_HV_DECREMENTER:
1364                 vcpu->stat.dec_exits++;
1365                 r = RESUME_GUEST;
1366                 break;
1367         case BOOK3S_INTERRUPT_EXTERNAL:
1368                 vcpu->stat.ext_intr_exits++;
1369                 r = RESUME_HOST;
1370                 break;
1371         case BOOK3S_INTERRUPT_H_DOORBELL:
1372         case BOOK3S_INTERRUPT_H_VIRT:
1373                 vcpu->stat.ext_intr_exits++;
1374                 r = RESUME_GUEST;
1375                 break;
1376         /* SR/HMI/PMI are HV interrupts that host has handled. Resume guest.*/
1377         case BOOK3S_INTERRUPT_HMI:
1378         case BOOK3S_INTERRUPT_PERFMON:
1379         case BOOK3S_INTERRUPT_SYSTEM_RESET:
1380                 r = RESUME_GUEST;
1381                 break;
1382         case BOOK3S_INTERRUPT_MACHINE_CHECK:
1383                 /* Pass the machine check to the L1 guest */
1384                 r = RESUME_HOST;
1385                 /* Print the MCE event to host console. */
1386                 machine_check_print_event_info(&vcpu->arch.mce_evt, false);
1387                 break;
1388         /*
1389          * We get these next two if the guest accesses a page which it thinks
1390          * it has mapped but which is not actually present, either because
1391          * it is for an emulated I/O device or because the corresonding
1392          * host page has been paged out.
1393          */
1394         case BOOK3S_INTERRUPT_H_DATA_STORAGE:
1395                 srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
1396                 r = kvmhv_nested_page_fault(vcpu);
1397                 srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx);
1398                 break;
1399         case BOOK3S_INTERRUPT_H_INST_STORAGE:
1400                 vcpu->arch.fault_dar = kvmppc_get_pc(vcpu);
1401                 vcpu->arch.fault_dsisr = kvmppc_get_msr(vcpu) &
1402                                          DSISR_SRR1_MATCH_64S;
1403                 if (vcpu->arch.shregs.msr & HSRR1_HISI_WRITE)
1404                         vcpu->arch.fault_dsisr |= DSISR_ISSTORE;
1405                 srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
1406                 r = kvmhv_nested_page_fault(vcpu);
1407                 srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx);
1408                 break;
1409
1410 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1411         case BOOK3S_INTERRUPT_HV_SOFTPATCH:
1412                 /*
1413                  * This occurs for various TM-related instructions that
1414                  * we need to emulate on POWER9 DD2.2.  We have already
1415                  * handled the cases where the guest was in real-suspend
1416                  * mode and was transitioning to transactional state.
1417                  */
1418                 r = kvmhv_p9_tm_emulation(vcpu);
1419                 break;
1420 #endif
1421
1422         case BOOK3S_INTERRUPT_HV_RM_HARD:
1423                 vcpu->arch.trap = 0;
1424                 r = RESUME_GUEST;
1425                 if (!xive_enabled())
1426                         kvmppc_xics_rm_complete(vcpu, 0);
1427                 break;
1428         default:
1429                 r = RESUME_HOST;
1430                 break;
1431         }
1432
1433         return r;
1434 }
1435
1436 static int kvm_arch_vcpu_ioctl_get_sregs_hv(struct kvm_vcpu *vcpu,
1437                                             struct kvm_sregs *sregs)
1438 {
1439         int i;
1440
1441         memset(sregs, 0, sizeof(struct kvm_sregs));
1442         sregs->pvr = vcpu->arch.pvr;
1443         for (i = 0; i < vcpu->arch.slb_max; i++) {
1444                 sregs->u.s.ppc64.slb[i].slbe = vcpu->arch.slb[i].orige;
1445                 sregs->u.s.ppc64.slb[i].slbv = vcpu->arch.slb[i].origv;
1446         }
1447
1448         return 0;
1449 }
1450
1451 static int kvm_arch_vcpu_ioctl_set_sregs_hv(struct kvm_vcpu *vcpu,
1452                                             struct kvm_sregs *sregs)
1453 {
1454         int i, j;
1455
1456         /* Only accept the same PVR as the host's, since we can't spoof it */
1457         if (sregs->pvr != vcpu->arch.pvr)
1458                 return -EINVAL;
1459
1460         j = 0;
1461         for (i = 0; i < vcpu->arch.slb_nr; i++) {
1462                 if (sregs->u.s.ppc64.slb[i].slbe & SLB_ESID_V) {
1463                         vcpu->arch.slb[j].orige = sregs->u.s.ppc64.slb[i].slbe;
1464                         vcpu->arch.slb[j].origv = sregs->u.s.ppc64.slb[i].slbv;
1465                         ++j;
1466                 }
1467         }
1468         vcpu->arch.slb_max = j;
1469
1470         return 0;
1471 }
1472
1473 static void kvmppc_set_lpcr(struct kvm_vcpu *vcpu, u64 new_lpcr,
1474                 bool preserve_top32)
1475 {
1476         struct kvm *kvm = vcpu->kvm;
1477         struct kvmppc_vcore *vc = vcpu->arch.vcore;
1478         u64 mask;
1479
1480         mutex_lock(&kvm->lock);
1481         spin_lock(&vc->lock);
1482         /*
1483          * If ILE (interrupt little-endian) has changed, update the
1484          * MSR_LE bit in the intr_msr for each vcpu in this vcore.
1485          */
1486         if ((new_lpcr & LPCR_ILE) != (vc->lpcr & LPCR_ILE)) {
1487                 struct kvm_vcpu *vcpu;
1488                 int i;
1489
1490                 kvm_for_each_vcpu(i, vcpu, kvm) {
1491                         if (vcpu->arch.vcore != vc)
1492                                 continue;
1493                         if (new_lpcr & LPCR_ILE)
1494                                 vcpu->arch.intr_msr |= MSR_LE;
1495                         else
1496                                 vcpu->arch.intr_msr &= ~MSR_LE;
1497                 }
1498         }
1499
1500         /*
1501          * Userspace can only modify DPFD (default prefetch depth),
1502          * ILE (interrupt little-endian) and TC (translation control).
1503          * On POWER8 and POWER9 userspace can also modify AIL (alt. interrupt loc.).
1504          */
1505         mask = LPCR_DPFD | LPCR_ILE | LPCR_TC;
1506         if (cpu_has_feature(CPU_FTR_ARCH_207S))
1507                 mask |= LPCR_AIL;
1508         /*
1509          * On POWER9, allow userspace to enable large decrementer for the
1510          * guest, whether or not the host has it enabled.
1511          */
1512         if (cpu_has_feature(CPU_FTR_ARCH_300))
1513                 mask |= LPCR_LD;
1514
1515         /* Broken 32-bit version of LPCR must not clear top bits */
1516         if (preserve_top32)
1517                 mask &= 0xFFFFFFFF;
1518         vc->lpcr = (vc->lpcr & ~mask) | (new_lpcr & mask);
1519         spin_unlock(&vc->lock);
1520         mutex_unlock(&kvm->lock);
1521 }
1522
1523 static int kvmppc_get_one_reg_hv(struct kvm_vcpu *vcpu, u64 id,
1524                                  union kvmppc_one_reg *val)
1525 {
1526         int r = 0;
1527         long int i;
1528
1529         switch (id) {
1530         case KVM_REG_PPC_DEBUG_INST:
1531                 *val = get_reg_val(id, KVMPPC_INST_SW_BREAKPOINT);
1532                 break;
1533         case KVM_REG_PPC_HIOR:
1534                 *val = get_reg_val(id, 0);
1535                 break;
1536         case KVM_REG_PPC_DABR:
1537                 *val = get_reg_val(id, vcpu->arch.dabr);
1538                 break;
1539         case KVM_REG_PPC_DABRX:
1540                 *val = get_reg_val(id, vcpu->arch.dabrx);
1541                 break;
1542         case KVM_REG_PPC_DSCR:
1543                 *val = get_reg_val(id, vcpu->arch.dscr);
1544                 break;
1545         case KVM_REG_PPC_PURR:
1546                 *val = get_reg_val(id, vcpu->arch.purr);
1547                 break;
1548         case KVM_REG_PPC_SPURR:
1549                 *val = get_reg_val(id, vcpu->arch.spurr);
1550                 break;
1551         case KVM_REG_PPC_AMR:
1552                 *val = get_reg_val(id, vcpu->arch.amr);
1553                 break;
1554         case KVM_REG_PPC_UAMOR:
1555                 *val = get_reg_val(id, vcpu->arch.uamor);
1556                 break;
1557         case KVM_REG_PPC_MMCR0 ... KVM_REG_PPC_MMCRS:
1558                 i = id - KVM_REG_PPC_MMCR0;
1559                 *val = get_reg_val(id, vcpu->arch.mmcr[i]);
1560                 break;
1561         case KVM_REG_PPC_PMC1 ... KVM_REG_PPC_PMC8:
1562                 i = id - KVM_REG_PPC_PMC1;
1563                 *val = get_reg_val(id, vcpu->arch.pmc[i]);
1564                 break;
1565         case KVM_REG_PPC_SPMC1 ... KVM_REG_PPC_SPMC2:
1566                 i = id - KVM_REG_PPC_SPMC1;
1567                 *val = get_reg_val(id, vcpu->arch.spmc[i]);
1568                 break;
1569         case KVM_REG_PPC_SIAR:
1570                 *val = get_reg_val(id, vcpu->arch.siar);
1571                 break;
1572         case KVM_REG_PPC_SDAR:
1573                 *val = get_reg_val(id, vcpu->arch.sdar);
1574                 break;
1575         case KVM_REG_PPC_SIER:
1576                 *val = get_reg_val(id, vcpu->arch.sier);
1577                 break;
1578         case KVM_REG_PPC_IAMR:
1579                 *val = get_reg_val(id, vcpu->arch.iamr);
1580                 break;
1581         case KVM_REG_PPC_PSPB:
1582                 *val = get_reg_val(id, vcpu->arch.pspb);
1583                 break;
1584         case KVM_REG_PPC_DPDES:
1585                 *val = get_reg_val(id, vcpu->arch.vcore->dpdes);
1586                 break;
1587         case KVM_REG_PPC_VTB:
1588                 *val = get_reg_val(id, vcpu->arch.vcore->vtb);
1589                 break;
1590         case KVM_REG_PPC_DAWR:
1591                 *val = get_reg_val(id, vcpu->arch.dawr);
1592                 break;
1593         case KVM_REG_PPC_DAWRX:
1594                 *val = get_reg_val(id, vcpu->arch.dawrx);
1595                 break;
1596         case KVM_REG_PPC_CIABR:
1597                 *val = get_reg_val(id, vcpu->arch.ciabr);
1598                 break;
1599         case KVM_REG_PPC_CSIGR:
1600                 *val = get_reg_val(id, vcpu->arch.csigr);
1601                 break;
1602         case KVM_REG_PPC_TACR:
1603                 *val = get_reg_val(id, vcpu->arch.tacr);
1604                 break;
1605         case KVM_REG_PPC_TCSCR:
1606                 *val = get_reg_val(id, vcpu->arch.tcscr);
1607                 break;
1608         case KVM_REG_PPC_PID:
1609                 *val = get_reg_val(id, vcpu->arch.pid);
1610                 break;
1611         case KVM_REG_PPC_ACOP:
1612                 *val = get_reg_val(id, vcpu->arch.acop);
1613                 break;
1614         case KVM_REG_PPC_WORT:
1615                 *val = get_reg_val(id, vcpu->arch.wort);
1616                 break;
1617         case KVM_REG_PPC_TIDR:
1618                 *val = get_reg_val(id, vcpu->arch.tid);
1619                 break;
1620         case KVM_REG_PPC_PSSCR:
1621                 *val = get_reg_val(id, vcpu->arch.psscr);
1622                 break;
1623         case KVM_REG_PPC_VPA_ADDR:
1624                 spin_lock(&vcpu->arch.vpa_update_lock);
1625                 *val = get_reg_val(id, vcpu->arch.vpa.next_gpa);
1626                 spin_unlock(&vcpu->arch.vpa_update_lock);
1627                 break;
1628         case KVM_REG_PPC_VPA_SLB:
1629                 spin_lock(&vcpu->arch.vpa_update_lock);
1630                 val->vpaval.addr = vcpu->arch.slb_shadow.next_gpa;
1631                 val->vpaval.length = vcpu->arch.slb_shadow.len;
1632                 spin_unlock(&vcpu->arch.vpa_update_lock);
1633                 break;
1634         case KVM_REG_PPC_VPA_DTL:
1635                 spin_lock(&vcpu->arch.vpa_update_lock);
1636                 val->vpaval.addr = vcpu->arch.dtl.next_gpa;
1637                 val->vpaval.length = vcpu->arch.dtl.len;
1638                 spin_unlock(&vcpu->arch.vpa_update_lock);
1639                 break;
1640         case KVM_REG_PPC_TB_OFFSET:
1641                 *val = get_reg_val(id, vcpu->arch.vcore->tb_offset);
1642                 break;
1643         case KVM_REG_PPC_LPCR:
1644         case KVM_REG_PPC_LPCR_64:
1645                 *val = get_reg_val(id, vcpu->arch.vcore->lpcr);
1646                 break;
1647         case KVM_REG_PPC_PPR:
1648                 *val = get_reg_val(id, vcpu->arch.ppr);
1649                 break;
1650 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1651         case KVM_REG_PPC_TFHAR:
1652                 *val = get_reg_val(id, vcpu->arch.tfhar);
1653                 break;
1654         case KVM_REG_PPC_TFIAR:
1655                 *val = get_reg_val(id, vcpu->arch.tfiar);
1656                 break;
1657         case KVM_REG_PPC_TEXASR:
1658                 *val = get_reg_val(id, vcpu->arch.texasr);
1659                 break;
1660         case KVM_REG_PPC_TM_GPR0 ... KVM_REG_PPC_TM_GPR31:
1661                 i = id - KVM_REG_PPC_TM_GPR0;
1662                 *val = get_reg_val(id, vcpu->arch.gpr_tm[i]);
1663                 break;
1664         case KVM_REG_PPC_TM_VSR0 ... KVM_REG_PPC_TM_VSR63:
1665         {
1666                 int j;
1667                 i = id - KVM_REG_PPC_TM_VSR0;
1668                 if (i < 32)
1669                         for (j = 0; j < TS_FPRWIDTH; j++)
1670                                 val->vsxval[j] = vcpu->arch.fp_tm.fpr[i][j];
1671                 else {
1672                         if (cpu_has_feature(CPU_FTR_ALTIVEC))
1673                                 val->vval = vcpu->arch.vr_tm.vr[i-32];
1674                         else
1675                                 r = -ENXIO;
1676                 }
1677                 break;
1678         }
1679         case KVM_REG_PPC_TM_CR:
1680                 *val = get_reg_val(id, vcpu->arch.cr_tm);
1681                 break;
1682         case KVM_REG_PPC_TM_XER:
1683                 *val = get_reg_val(id, vcpu->arch.xer_tm);
1684                 break;
1685         case KVM_REG_PPC_TM_LR:
1686                 *val = get_reg_val(id, vcpu->arch.lr_tm);
1687                 break;
1688         case KVM_REG_PPC_TM_CTR:
1689                 *val = get_reg_val(id, vcpu->arch.ctr_tm);
1690                 break;
1691         case KVM_REG_PPC_TM_FPSCR:
1692                 *val = get_reg_val(id, vcpu->arch.fp_tm.fpscr);
1693                 break;
1694         case KVM_REG_PPC_TM_AMR:
1695                 *val = get_reg_val(id, vcpu->arch.amr_tm);
1696                 break;
1697         case KVM_REG_PPC_TM_PPR:
1698                 *val = get_reg_val(id, vcpu->arch.ppr_tm);
1699                 break;
1700         case KVM_REG_PPC_TM_VRSAVE:
1701                 *val = get_reg_val(id, vcpu->arch.vrsave_tm);
1702                 break;
1703         case KVM_REG_PPC_TM_VSCR:
1704                 if (cpu_has_feature(CPU_FTR_ALTIVEC))
1705                         *val = get_reg_val(id, vcpu->arch.vr_tm.vscr.u[3]);
1706                 else
1707                         r = -ENXIO;
1708                 break;
1709         case KVM_REG_PPC_TM_DSCR:
1710                 *val = get_reg_val(id, vcpu->arch.dscr_tm);
1711                 break;
1712         case KVM_REG_PPC_TM_TAR:
1713                 *val = get_reg_val(id, vcpu->arch.tar_tm);
1714                 break;
1715 #endif
1716         case KVM_REG_PPC_ARCH_COMPAT:
1717                 *val = get_reg_val(id, vcpu->arch.vcore->arch_compat);
1718                 break;
1719         case KVM_REG_PPC_DEC_EXPIRY:
1720                 *val = get_reg_val(id, vcpu->arch.dec_expires +
1721                                    vcpu->arch.vcore->tb_offset);
1722                 break;
1723         case KVM_REG_PPC_ONLINE:
1724                 *val = get_reg_val(id, vcpu->arch.online);
1725                 break;
1726         case KVM_REG_PPC_PTCR:
1727                 *val = get_reg_val(id, vcpu->kvm->arch.l1_ptcr);
1728                 break;
1729         default:
1730                 r = -EINVAL;
1731                 break;
1732         }
1733
1734         return r;
1735 }
1736
1737 static int kvmppc_set_one_reg_hv(struct kvm_vcpu *vcpu, u64 id,
1738                                  union kvmppc_one_reg *val)
1739 {
1740         int r = 0;
1741         long int i;
1742         unsigned long addr, len;
1743
1744         switch (id) {
1745         case KVM_REG_PPC_HIOR:
1746                 /* Only allow this to be set to zero */
1747                 if (set_reg_val(id, *val))
1748                         r = -EINVAL;
1749                 break;
1750         case KVM_REG_PPC_DABR:
1751                 vcpu->arch.dabr = set_reg_val(id, *val);
1752                 break;
1753         case KVM_REG_PPC_DABRX:
1754                 vcpu->arch.dabrx = set_reg_val(id, *val) & ~DABRX_HYP;
1755                 break;
1756         case KVM_REG_PPC_DSCR:
1757                 vcpu->arch.dscr = set_reg_val(id, *val);
1758                 break;
1759         case KVM_REG_PPC_PURR:
1760                 vcpu->arch.purr = set_reg_val(id, *val);
1761                 break;
1762         case KVM_REG_PPC_SPURR:
1763                 vcpu->arch.spurr = set_reg_val(id, *val);
1764                 break;
1765         case KVM_REG_PPC_AMR:
1766                 vcpu->arch.amr = set_reg_val(id, *val);
1767                 break;
1768         case KVM_REG_PPC_UAMOR:
1769                 vcpu->arch.uamor = set_reg_val(id, *val);
1770                 break;
1771         case KVM_REG_PPC_MMCR0 ... KVM_REG_PPC_MMCRS:
1772                 i = id - KVM_REG_PPC_MMCR0;
1773                 vcpu->arch.mmcr[i] = set_reg_val(id, *val);
1774                 break;
1775         case KVM_REG_PPC_PMC1 ... KVM_REG_PPC_PMC8:
1776                 i = id - KVM_REG_PPC_PMC1;
1777                 vcpu->arch.pmc[i] = set_reg_val(id, *val);
1778                 break;
1779         case KVM_REG_PPC_SPMC1 ... KVM_REG_PPC_SPMC2:
1780                 i = id - KVM_REG_PPC_SPMC1;
1781                 vcpu->arch.spmc[i] = set_reg_val(id, *val);
1782                 break;
1783         case KVM_REG_PPC_SIAR:
1784                 vcpu->arch.siar = set_reg_val(id, *val);
1785                 break;
1786         case KVM_REG_PPC_SDAR:
1787                 vcpu->arch.sdar = set_reg_val(id, *val);
1788                 break;
1789         case KVM_REG_PPC_SIER:
1790                 vcpu->arch.sier = set_reg_val(id, *val);
1791                 break;
1792         case KVM_REG_PPC_IAMR:
1793                 vcpu->arch.iamr = set_reg_val(id, *val);
1794                 break;
1795         case KVM_REG_PPC_PSPB:
1796                 vcpu->arch.pspb = set_reg_val(id, *val);
1797                 break;
1798         case KVM_REG_PPC_DPDES:
1799                 vcpu->arch.vcore->dpdes = set_reg_val(id, *val);
1800                 break;
1801         case KVM_REG_PPC_VTB:
1802                 vcpu->arch.vcore->vtb = set_reg_val(id, *val);
1803                 break;
1804         case KVM_REG_PPC_DAWR:
1805                 vcpu->arch.dawr = set_reg_val(id, *val);
1806                 break;
1807         case KVM_REG_PPC_DAWRX:
1808                 vcpu->arch.dawrx = set_reg_val(id, *val) & ~DAWRX_HYP;
1809                 break;
1810         case KVM_REG_PPC_CIABR:
1811                 vcpu->arch.ciabr = set_reg_val(id, *val);
1812                 /* Don't allow setting breakpoints in hypervisor code */
1813                 if ((vcpu->arch.ciabr & CIABR_PRIV) == CIABR_PRIV_HYPER)
1814                         vcpu->arch.ciabr &= ~CIABR_PRIV;        /* disable */
1815                 break;
1816         case KVM_REG_PPC_CSIGR:
1817                 vcpu->arch.csigr = set_reg_val(id, *val);
1818                 break;
1819         case KVM_REG_PPC_TACR:
1820                 vcpu->arch.tacr = set_reg_val(id, *val);
1821                 break;
1822         case KVM_REG_PPC_TCSCR:
1823                 vcpu->arch.tcscr = set_reg_val(id, *val);
1824                 break;
1825         case KVM_REG_PPC_PID:
1826                 vcpu->arch.pid = set_reg_val(id, *val);
1827                 break;
1828         case KVM_REG_PPC_ACOP:
1829                 vcpu->arch.acop = set_reg_val(id, *val);
1830                 break;
1831         case KVM_REG_PPC_WORT:
1832                 vcpu->arch.wort = set_reg_val(id, *val);
1833                 break;
1834         case KVM_REG_PPC_TIDR:
1835                 vcpu->arch.tid = set_reg_val(id, *val);
1836                 break;
1837         case KVM_REG_PPC_PSSCR:
1838                 vcpu->arch.psscr = set_reg_val(id, *val) & PSSCR_GUEST_VIS;
1839                 break;
1840         case KVM_REG_PPC_VPA_ADDR:
1841                 addr = set_reg_val(id, *val);
1842                 r = -EINVAL;
1843                 if (!addr && (vcpu->arch.slb_shadow.next_gpa ||
1844                               vcpu->arch.dtl.next_gpa))
1845                         break;
1846                 r = set_vpa(vcpu, &vcpu->arch.vpa, addr, sizeof(struct lppaca));
1847                 break;
1848         case KVM_REG_PPC_VPA_SLB:
1849                 addr = val->vpaval.addr;
1850                 len = val->vpaval.length;
1851                 r = -EINVAL;
1852                 if (addr && !vcpu->arch.vpa.next_gpa)
1853                         break;
1854                 r = set_vpa(vcpu, &vcpu->arch.slb_shadow, addr, len);
1855                 break;
1856         case KVM_REG_PPC_VPA_DTL:
1857                 addr = val->vpaval.addr;
1858                 len = val->vpaval.length;
1859                 r = -EINVAL;
1860                 if (addr && (len < sizeof(struct dtl_entry) ||
1861                              !vcpu->arch.vpa.next_gpa))
1862                         break;
1863                 len -= len % sizeof(struct dtl_entry);
1864                 r = set_vpa(vcpu, &vcpu->arch.dtl, addr, len);
1865                 break;
1866         case KVM_REG_PPC_TB_OFFSET:
1867                 /* round up to multiple of 2^24 */
1868                 vcpu->arch.vcore->tb_offset =
1869                         ALIGN(set_reg_val(id, *val), 1UL << 24);
1870                 break;
1871         case KVM_REG_PPC_LPCR:
1872                 kvmppc_set_lpcr(vcpu, set_reg_val(id, *val), true);
1873                 break;
1874         case KVM_REG_PPC_LPCR_64:
1875                 kvmppc_set_lpcr(vcpu, set_reg_val(id, *val), false);
1876                 break;
1877         case KVM_REG_PPC_PPR:
1878                 vcpu->arch.ppr = set_reg_val(id, *val);
1879                 break;
1880 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1881         case KVM_REG_PPC_TFHAR:
1882                 vcpu->arch.tfhar = set_reg_val(id, *val);
1883                 break;
1884         case KVM_REG_PPC_TFIAR:
1885                 vcpu->arch.tfiar = set_reg_val(id, *val);
1886                 break;
1887         case KVM_REG_PPC_TEXASR:
1888                 vcpu->arch.texasr = set_reg_val(id, *val);
1889                 break;
1890         case KVM_REG_PPC_TM_GPR0 ... KVM_REG_PPC_TM_GPR31:
1891                 i = id - KVM_REG_PPC_TM_GPR0;
1892                 vcpu->arch.gpr_tm[i] = set_reg_val(id, *val);
1893                 break;
1894         case KVM_REG_PPC_TM_VSR0 ... KVM_REG_PPC_TM_VSR63:
1895         {
1896                 int j;
1897                 i = id - KVM_REG_PPC_TM_VSR0;
1898                 if (i < 32)
1899                         for (j = 0; j < TS_FPRWIDTH; j++)
1900                                 vcpu->arch.fp_tm.fpr[i][j] = val->vsxval[j];
1901                 else
1902                         if (cpu_has_feature(CPU_FTR_ALTIVEC))
1903                                 vcpu->arch.vr_tm.vr[i-32] = val->vval;
1904                         else
1905                                 r = -ENXIO;
1906                 break;
1907         }
1908         case KVM_REG_PPC_TM_CR:
1909                 vcpu->arch.cr_tm = set_reg_val(id, *val);
1910                 break;
1911         case KVM_REG_PPC_TM_XER:
1912                 vcpu->arch.xer_tm = set_reg_val(id, *val);
1913                 break;
1914         case KVM_REG_PPC_TM_LR:
1915                 vcpu->arch.lr_tm = set_reg_val(id, *val);
1916                 break;
1917         case KVM_REG_PPC_TM_CTR:
1918                 vcpu->arch.ctr_tm = set_reg_val(id, *val);
1919                 break;
1920         case KVM_REG_PPC_TM_FPSCR:
1921                 vcpu->arch.fp_tm.fpscr = set_reg_val(id, *val);
1922                 break;
1923         case KVM_REG_PPC_TM_AMR:
1924                 vcpu->arch.amr_tm = set_reg_val(id, *val);
1925                 break;
1926         case KVM_REG_PPC_TM_PPR:
1927                 vcpu->arch.ppr_tm = set_reg_val(id, *val);
1928                 break;
1929         case KVM_REG_PPC_TM_VRSAVE:
1930                 vcpu->arch.vrsave_tm = set_reg_val(id, *val);
1931                 break;
1932         case KVM_REG_PPC_TM_VSCR:
1933                 if (cpu_has_feature(CPU_FTR_ALTIVEC))
1934                         vcpu->arch.vr.vscr.u[3] = set_reg_val(id, *val);
1935                 else
1936                         r = - ENXIO;
1937                 break;
1938         case KVM_REG_PPC_TM_DSCR:
1939                 vcpu->arch.dscr_tm = set_reg_val(id, *val);
1940                 break;
1941         case KVM_REG_PPC_TM_TAR:
1942                 vcpu->arch.tar_tm = set_reg_val(id, *val);
1943                 break;
1944 #endif
1945         case KVM_REG_PPC_ARCH_COMPAT:
1946                 r = kvmppc_set_arch_compat(vcpu, set_reg_val(id, *val));
1947                 break;
1948         case KVM_REG_PPC_DEC_EXPIRY:
1949                 vcpu->arch.dec_expires = set_reg_val(id, *val) -
1950                         vcpu->arch.vcore->tb_offset;
1951                 break;
1952         case KVM_REG_PPC_ONLINE:
1953                 i = set_reg_val(id, *val);
1954                 if (i && !vcpu->arch.online)
1955                         atomic_inc(&vcpu->arch.vcore->online_count);
1956                 else if (!i && vcpu->arch.online)
1957                         atomic_dec(&vcpu->arch.vcore->online_count);
1958                 vcpu->arch.online = i;
1959                 break;
1960         case KVM_REG_PPC_PTCR:
1961                 vcpu->kvm->arch.l1_ptcr = set_reg_val(id, *val);
1962                 break;
1963         default:
1964                 r = -EINVAL;
1965                 break;
1966         }
1967
1968         return r;
1969 }
1970
1971 /*
1972  * On POWER9, threads are independent and can be in different partitions.
1973  * Therefore we consider each thread to be a subcore.
1974  * There is a restriction that all threads have to be in the same
1975  * MMU mode (radix or HPT), unfortunately, but since we only support
1976  * HPT guests on a HPT host so far, that isn't an impediment yet.
1977  */
1978 static int threads_per_vcore(struct kvm *kvm)
1979 {
1980         if (kvm->arch.threads_indep)
1981                 return 1;
1982         return threads_per_subcore;
1983 }
1984
1985 static struct kvmppc_vcore *kvmppc_vcore_create(struct kvm *kvm, int id)
1986 {
1987         struct kvmppc_vcore *vcore;
1988
1989         vcore = kzalloc(sizeof(struct kvmppc_vcore), GFP_KERNEL);
1990
1991         if (vcore == NULL)
1992                 return NULL;
1993
1994         spin_lock_init(&vcore->lock);
1995         spin_lock_init(&vcore->stoltb_lock);
1996         init_swait_queue_head(&vcore->wq);
1997         vcore->preempt_tb = TB_NIL;
1998         vcore->lpcr = kvm->arch.lpcr;
1999         vcore->first_vcpuid = id;
2000         vcore->kvm = kvm;
2001         INIT_LIST_HEAD(&vcore->preempt_list);
2002
2003         return vcore;
2004 }
2005
2006 #ifdef CONFIG_KVM_BOOK3S_HV_EXIT_TIMING
2007 static struct debugfs_timings_element {
2008         const char *name;
2009         size_t offset;
2010 } timings[] = {
2011         {"rm_entry",    offsetof(struct kvm_vcpu, arch.rm_entry)},
2012         {"rm_intr",     offsetof(struct kvm_vcpu, arch.rm_intr)},
2013         {"rm_exit",     offsetof(struct kvm_vcpu, arch.rm_exit)},
2014         {"guest",       offsetof(struct kvm_vcpu, arch.guest_time)},
2015         {"cede",        offsetof(struct kvm_vcpu, arch.cede_time)},
2016 };
2017
2018 #define N_TIMINGS       (ARRAY_SIZE(timings))
2019
2020 struct debugfs_timings_state {
2021         struct kvm_vcpu *vcpu;
2022         unsigned int    buflen;
2023         char            buf[N_TIMINGS * 100];
2024 };
2025
2026 static int debugfs_timings_open(struct inode *inode, struct file *file)
2027 {
2028         struct kvm_vcpu *vcpu = inode->i_private;
2029         struct debugfs_timings_state *p;
2030
2031         p = kzalloc(sizeof(*p), GFP_KERNEL);
2032         if (!p)
2033                 return -ENOMEM;
2034
2035         kvm_get_kvm(vcpu->kvm);
2036         p->vcpu = vcpu;
2037         file->private_data = p;
2038
2039         return nonseekable_open(inode, file);
2040 }
2041
2042 static int debugfs_timings_release(struct inode *inode, struct file *file)
2043 {
2044         struct debugfs_timings_state *p = file->private_data;
2045
2046         kvm_put_kvm(p->vcpu->kvm);
2047         kfree(p);
2048         return 0;
2049 }
2050
2051 static ssize_t debugfs_timings_read(struct file *file, char __user *buf,
2052                                     size_t len, loff_t *ppos)
2053 {
2054         struct debugfs_timings_state *p = file->private_data;
2055         struct kvm_vcpu *vcpu = p->vcpu;
2056         char *s, *buf_end;
2057         struct kvmhv_tb_accumulator tb;
2058         u64 count;
2059         loff_t pos;
2060         ssize_t n;
2061         int i, loops;
2062         bool ok;
2063
2064         if (!p->buflen) {
2065                 s = p->buf;
2066                 buf_end = s + sizeof(p->buf);
2067                 for (i = 0; i < N_TIMINGS; ++i) {
2068                         struct kvmhv_tb_accumulator *acc;
2069
2070                         acc = (struct kvmhv_tb_accumulator *)
2071                                 ((unsigned long)vcpu + timings[i].offset);
2072                         ok = false;
2073                         for (loops = 0; loops < 1000; ++loops) {
2074                                 count = acc->seqcount;
2075                                 if (!(count & 1)) {
2076                                         smp_rmb();
2077                                         tb = *acc;
2078                                         smp_rmb();
2079                                         if (count == acc->seqcount) {
2080                                                 ok = true;
2081                                                 break;
2082                                         }
2083                                 }
2084                                 udelay(1);
2085                         }
2086                         if (!ok)
2087                                 snprintf(s, buf_end - s, "%s: stuck\n",
2088                                         timings[i].name);
2089                         else
2090                                 snprintf(s, buf_end - s,
2091                                         "%s: %llu %llu %llu %llu\n",
2092                                         timings[i].name, count / 2,
2093                                         tb_to_ns(tb.tb_total),
2094                                         tb_to_ns(tb.tb_min),
2095                                         tb_to_ns(tb.tb_max));
2096                         s += strlen(s);
2097                 }
2098                 p->buflen = s - p->buf;
2099         }
2100
2101         pos = *ppos;
2102         if (pos >= p->buflen)
2103                 return 0;
2104         if (len > p->buflen - pos)
2105                 len = p->buflen - pos;
2106         n = copy_to_user(buf, p->buf + pos, len);
2107         if (n) {
2108                 if (n == len)
2109                         return -EFAULT;
2110                 len -= n;
2111         }
2112         *ppos = pos + len;
2113         return len;
2114 }
2115
2116 static ssize_t debugfs_timings_write(struct file *file, const char __user *buf,
2117                                      size_t len, loff_t *ppos)
2118 {
2119         return -EACCES;
2120 }
2121
2122 static const struct file_operations debugfs_timings_ops = {
2123         .owner   = THIS_MODULE,
2124         .open    = debugfs_timings_open,
2125         .release = debugfs_timings_release,
2126         .read    = debugfs_timings_read,
2127         .write   = debugfs_timings_write,
2128         .llseek  = generic_file_llseek,
2129 };
2130
2131 /* Create a debugfs directory for the vcpu */
2132 static void debugfs_vcpu_init(struct kvm_vcpu *vcpu, unsigned int id)
2133 {
2134         char buf[16];
2135         struct kvm *kvm = vcpu->kvm;
2136
2137         snprintf(buf, sizeof(buf), "vcpu%u", id);
2138         if (IS_ERR_OR_NULL(kvm->arch.debugfs_dir))
2139                 return;
2140         vcpu->arch.debugfs_dir = debugfs_create_dir(buf, kvm->arch.debugfs_dir);
2141         if (IS_ERR_OR_NULL(vcpu->arch.debugfs_dir))
2142                 return;
2143         vcpu->arch.debugfs_timings =
2144                 debugfs_create_file("timings", 0444, vcpu->arch.debugfs_dir,
2145                                     vcpu, &debugfs_timings_ops);
2146 }
2147
2148 #else /* CONFIG_KVM_BOOK3S_HV_EXIT_TIMING */
2149 static void debugfs_vcpu_init(struct kvm_vcpu *vcpu, unsigned int id)
2150 {
2151 }
2152 #endif /* CONFIG_KVM_BOOK3S_HV_EXIT_TIMING */
2153
2154 static struct kvm_vcpu *kvmppc_core_vcpu_create_hv(struct kvm *kvm,
2155                                                    unsigned int id)
2156 {
2157         struct kvm_vcpu *vcpu;
2158         int err;
2159         int core;
2160         struct kvmppc_vcore *vcore;
2161
2162         err = -ENOMEM;
2163         vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
2164         if (!vcpu)
2165                 goto out;
2166
2167         err = kvm_vcpu_init(vcpu, kvm, id);
2168         if (err)
2169                 goto free_vcpu;
2170
2171         vcpu->arch.shared = &vcpu->arch.shregs;
2172 #ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE
2173         /*
2174          * The shared struct is never shared on HV,
2175          * so we can always use host endianness
2176          */
2177 #ifdef __BIG_ENDIAN__
2178         vcpu->arch.shared_big_endian = true;
2179 #else
2180         vcpu->arch.shared_big_endian = false;
2181 #endif
2182 #endif
2183         vcpu->arch.mmcr[0] = MMCR0_FC;
2184         vcpu->arch.ctrl = CTRL_RUNLATCH;
2185         /* default to host PVR, since we can't spoof it */
2186         kvmppc_set_pvr_hv(vcpu, mfspr(SPRN_PVR));
2187         spin_lock_init(&vcpu->arch.vpa_update_lock);
2188         spin_lock_init(&vcpu->arch.tbacct_lock);
2189         vcpu->arch.busy_preempt = TB_NIL;
2190         vcpu->arch.intr_msr = MSR_SF | MSR_ME;
2191
2192         /*
2193          * Set the default HFSCR for the guest from the host value.
2194          * This value is only used on POWER9.
2195          * On POWER9, we want to virtualize the doorbell facility, so we
2196          * don't set the HFSCR_MSGP bit, and that causes those instructions
2197          * to trap and then we emulate them.
2198          */
2199         vcpu->arch.hfscr = HFSCR_TAR | HFSCR_EBB | HFSCR_PM | HFSCR_BHRB |
2200                 HFSCR_DSCR | HFSCR_VECVSX | HFSCR_FP;
2201         if (cpu_has_feature(CPU_FTR_HVMODE)) {
2202                 vcpu->arch.hfscr &= mfspr(SPRN_HFSCR);
2203                 if (cpu_has_feature(CPU_FTR_P9_TM_HV_ASSIST))
2204                         vcpu->arch.hfscr |= HFSCR_TM;
2205         }
2206         if (cpu_has_feature(CPU_FTR_TM_COMP))
2207                 vcpu->arch.hfscr |= HFSCR_TM;
2208
2209         kvmppc_mmu_book3s_hv_init(vcpu);
2210
2211         vcpu->arch.state = KVMPPC_VCPU_NOTREADY;
2212
2213         init_waitqueue_head(&vcpu->arch.cpu_run);
2214
2215         mutex_lock(&kvm->lock);
2216         vcore = NULL;
2217         err = -EINVAL;
2218         if (cpu_has_feature(CPU_FTR_ARCH_300)) {
2219                 if (id >= (KVM_MAX_VCPUS * kvm->arch.emul_smt_mode)) {
2220                         pr_devel("KVM: VCPU ID too high\n");
2221                         core = KVM_MAX_VCORES;
2222                 } else {
2223                         BUG_ON(kvm->arch.smt_mode != 1);
2224                         core = kvmppc_pack_vcpu_id(kvm, id);
2225                 }
2226         } else {
2227                 core = id / kvm->arch.smt_mode;
2228         }
2229         if (core < KVM_MAX_VCORES) {
2230                 vcore = kvm->arch.vcores[core];
2231                 if (vcore && cpu_has_feature(CPU_FTR_ARCH_300)) {
2232                         pr_devel("KVM: collision on id %u", id);
2233                         vcore = NULL;
2234                 } else if (!vcore) {
2235                         err = -ENOMEM;
2236                         vcore = kvmppc_vcore_create(kvm,
2237                                         id & ~(kvm->arch.smt_mode - 1));
2238                         kvm->arch.vcores[core] = vcore;
2239                         kvm->arch.online_vcores++;
2240                 }
2241         }
2242         mutex_unlock(&kvm->lock);
2243
2244         if (!vcore)
2245                 goto free_vcpu;
2246
2247         spin_lock(&vcore->lock);
2248         ++vcore->num_threads;
2249         spin_unlock(&vcore->lock);
2250         vcpu->arch.vcore = vcore;
2251         vcpu->arch.ptid = vcpu->vcpu_id - vcore->first_vcpuid;
2252         vcpu->arch.thread_cpu = -1;
2253         vcpu->arch.prev_cpu = -1;
2254
2255         vcpu->arch.cpu_type = KVM_CPU_3S_64;
2256         kvmppc_sanity_check(vcpu);
2257
2258         debugfs_vcpu_init(vcpu, id);
2259
2260         return vcpu;
2261
2262 free_vcpu:
2263         kmem_cache_free(kvm_vcpu_cache, vcpu);
2264 out:
2265         return ERR_PTR(err);
2266 }
2267
2268 static int kvmhv_set_smt_mode(struct kvm *kvm, unsigned long smt_mode,
2269                               unsigned long flags)
2270 {
2271         int err;
2272         int esmt = 0;
2273
2274         if (flags)
2275                 return -EINVAL;
2276         if (smt_mode > MAX_SMT_THREADS || !is_power_of_2(smt_mode))
2277                 return -EINVAL;
2278         if (!cpu_has_feature(CPU_FTR_ARCH_300)) {
2279                 /*
2280                  * On POWER8 (or POWER7), the threading mode is "strict",
2281                  * so we pack smt_mode vcpus per vcore.
2282                  */
2283                 if (smt_mode > threads_per_subcore)
2284                         return -EINVAL;
2285         } else {
2286                 /*
2287                  * On POWER9, the threading mode is "loose",
2288                  * so each vcpu gets its own vcore.
2289                  */
2290                 esmt = smt_mode;
2291                 smt_mode = 1;
2292         }
2293         mutex_lock(&kvm->lock);
2294         err = -EBUSY;
2295         if (!kvm->arch.online_vcores) {
2296                 kvm->arch.smt_mode = smt_mode;
2297                 kvm->arch.emul_smt_mode = esmt;
2298                 err = 0;
2299         }
2300         mutex_unlock(&kvm->lock);
2301
2302         return err;
2303 }
2304
2305 static void unpin_vpa(struct kvm *kvm, struct kvmppc_vpa *vpa)
2306 {
2307         if (vpa->pinned_addr)
2308                 kvmppc_unpin_guest_page(kvm, vpa->pinned_addr, vpa->gpa,
2309                                         vpa->dirty);
2310 }
2311
2312 static void kvmppc_core_vcpu_free_hv(struct kvm_vcpu *vcpu)
2313 {
2314         spin_lock(&vcpu->arch.vpa_update_lock);
2315         unpin_vpa(vcpu->kvm, &vcpu->arch.dtl);
2316         unpin_vpa(vcpu->kvm, &vcpu->arch.slb_shadow);
2317         unpin_vpa(vcpu->kvm, &vcpu->arch.vpa);
2318         spin_unlock(&vcpu->arch.vpa_update_lock);
2319         kvm_vcpu_uninit(vcpu);
2320         kmem_cache_free(kvm_vcpu_cache, vcpu);
2321 }
2322
2323 static int kvmppc_core_check_requests_hv(struct kvm_vcpu *vcpu)
2324 {
2325         /* Indicate we want to get back into the guest */
2326         return 1;
2327 }
2328
2329 static void kvmppc_set_timer(struct kvm_vcpu *vcpu)
2330 {
2331         unsigned long dec_nsec, now;
2332
2333         now = get_tb();
2334         if (now > vcpu->arch.dec_expires) {
2335                 /* decrementer has already gone negative */
2336                 kvmppc_core_queue_dec(vcpu);
2337                 kvmppc_core_prepare_to_enter(vcpu);
2338                 return;
2339         }
2340         dec_nsec = tb_to_ns(vcpu->arch.dec_expires - now);
2341         hrtimer_start(&vcpu->arch.dec_timer, dec_nsec, HRTIMER_MODE_REL);
2342         vcpu->arch.timer_running = 1;
2343 }
2344
2345 static void kvmppc_end_cede(struct kvm_vcpu *vcpu)
2346 {
2347         vcpu->arch.ceded = 0;
2348         if (vcpu->arch.timer_running) {
2349                 hrtimer_try_to_cancel(&vcpu->arch.dec_timer);
2350                 vcpu->arch.timer_running = 0;
2351         }
2352 }
2353
2354 extern int __kvmppc_vcore_entry(void);
2355
2356 static void kvmppc_remove_runnable(struct kvmppc_vcore *vc,
2357                                    struct kvm_vcpu *vcpu)
2358 {
2359         u64 now;
2360
2361         if (vcpu->arch.state != KVMPPC_VCPU_RUNNABLE)
2362                 return;
2363         spin_lock_irq(&vcpu->arch.tbacct_lock);
2364         now = mftb();
2365         vcpu->arch.busy_stolen += vcore_stolen_time(vc, now) -
2366                 vcpu->arch.stolen_logged;
2367         vcpu->arch.busy_preempt = now;
2368         vcpu->arch.state = KVMPPC_VCPU_BUSY_IN_HOST;
2369         spin_unlock_irq(&vcpu->arch.tbacct_lock);
2370         --vc->n_runnable;
2371         WRITE_ONCE(vc->runnable_threads[vcpu->arch.ptid], NULL);
2372 }
2373
2374 static int kvmppc_grab_hwthread(int cpu)
2375 {
2376         struct paca_struct *tpaca;
2377         long timeout = 10000;
2378
2379         tpaca = paca_ptrs[cpu];
2380
2381         /* Ensure the thread won't go into the kernel if it wakes */
2382         tpaca->kvm_hstate.kvm_vcpu = NULL;
2383         tpaca->kvm_hstate.kvm_vcore = NULL;
2384         tpaca->kvm_hstate.napping = 0;
2385         smp_wmb();
2386         tpaca->kvm_hstate.hwthread_req = 1;
2387
2388         /*
2389          * If the thread is already executing in the kernel (e.g. handling
2390          * a stray interrupt), wait for it to get back to nap mode.
2391          * The smp_mb() is to ensure that our setting of hwthread_req
2392          * is visible before we look at hwthread_state, so if this
2393          * races with the code at system_reset_pSeries and the thread
2394          * misses our setting of hwthread_req, we are sure to see its
2395          * setting of hwthread_state, and vice versa.
2396          */
2397         smp_mb();
2398         while (tpaca->kvm_hstate.hwthread_state == KVM_HWTHREAD_IN_KERNEL) {
2399                 if (--timeout <= 0) {
2400                         pr_err("KVM: couldn't grab cpu %d\n", cpu);
2401                         return -EBUSY;
2402                 }
2403                 udelay(1);
2404         }
2405         return 0;
2406 }
2407
2408 static void kvmppc_release_hwthread(int cpu)
2409 {
2410         struct paca_struct *tpaca;
2411
2412         tpaca = paca_ptrs[cpu];
2413         tpaca->kvm_hstate.hwthread_req = 0;
2414         tpaca->kvm_hstate.kvm_vcpu = NULL;
2415         tpaca->kvm_hstate.kvm_vcore = NULL;
2416         tpaca->kvm_hstate.kvm_split_mode = NULL;
2417 }
2418
2419 static void radix_flush_cpu(struct kvm *kvm, int cpu, struct kvm_vcpu *vcpu)
2420 {
2421         struct kvm_nested_guest *nested = vcpu->arch.nested;
2422         cpumask_t *cpu_in_guest;
2423         int i;
2424
2425         cpu = cpu_first_thread_sibling(cpu);
2426         if (nested) {
2427                 cpumask_set_cpu(cpu, &nested->need_tlb_flush);
2428                 cpu_in_guest = &nested->cpu_in_guest;
2429         } else {
2430                 cpumask_set_cpu(cpu, &kvm->arch.need_tlb_flush);
2431                 cpu_in_guest = &kvm->arch.cpu_in_guest;
2432         }
2433         /*
2434          * Make sure setting of bit in need_tlb_flush precedes
2435          * testing of cpu_in_guest bits.  The matching barrier on
2436          * the other side is the first smp_mb() in kvmppc_run_core().
2437          */
2438         smp_mb();
2439         for (i = 0; i < threads_per_core; ++i)
2440                 if (cpumask_test_cpu(cpu + i, cpu_in_guest))
2441                         smp_call_function_single(cpu + i, do_nothing, NULL, 1);
2442 }
2443
2444 static void kvmppc_prepare_radix_vcpu(struct kvm_vcpu *vcpu, int pcpu)
2445 {
2446         struct kvm_nested_guest *nested = vcpu->arch.nested;
2447         struct kvm *kvm = vcpu->kvm;
2448         int prev_cpu;
2449
2450         if (!cpu_has_feature(CPU_FTR_HVMODE))
2451                 return;
2452
2453         if (nested)
2454                 prev_cpu = nested->prev_cpu[vcpu->arch.nested_vcpu_id];
2455         else
2456                 prev_cpu = vcpu->arch.prev_cpu;
2457
2458         /*
2459          * With radix, the guest can do TLB invalidations itself,
2460          * and it could choose to use the local form (tlbiel) if
2461          * it is invalidating a translation that has only ever been
2462          * used on one vcpu.  However, that doesn't mean it has
2463          * only ever been used on one physical cpu, since vcpus
2464          * can move around between pcpus.  To cope with this, when
2465          * a vcpu moves from one pcpu to another, we need to tell
2466          * any vcpus running on the same core as this vcpu previously
2467          * ran to flush the TLB.  The TLB is shared between threads,
2468          * so we use a single bit in .need_tlb_flush for all 4 threads.
2469          */
2470         if (prev_cpu != pcpu) {
2471                 if (prev_cpu >= 0 &&
2472                     cpu_first_thread_sibling(prev_cpu) !=
2473                     cpu_first_thread_sibling(pcpu))
2474                         radix_flush_cpu(kvm, prev_cpu, vcpu);
2475                 if (nested)
2476                         nested->prev_cpu[vcpu->arch.nested_vcpu_id] = pcpu;
2477                 else
2478                         vcpu->arch.prev_cpu = pcpu;
2479         }
2480 }
2481
2482 static void kvmppc_radix_check_need_tlb_flush(struct kvm *kvm, int pcpu,
2483                                               struct kvm_nested_guest *nested)
2484 {
2485         cpumask_t *need_tlb_flush;
2486         int lpid;
2487
2488         if (!cpu_has_feature(CPU_FTR_HVMODE))
2489                 return;
2490
2491         if (cpu_has_feature(CPU_FTR_ARCH_300))
2492                 pcpu &= ~0x3UL;
2493
2494         if (nested) {
2495                 lpid = nested->shadow_lpid;
2496                 need_tlb_flush = &nested->need_tlb_flush;
2497         } else {
2498                 lpid = kvm->arch.lpid;
2499                 need_tlb_flush = &kvm->arch.need_tlb_flush;
2500         }
2501
2502         mtspr(SPRN_LPID, lpid);
2503         isync();
2504         smp_mb();
2505
2506         if (cpumask_test_cpu(pcpu, need_tlb_flush)) {
2507                 radix__local_flush_tlb_lpid_guest(lpid);
2508                 /* Clear the bit after the TLB flush */
2509                 cpumask_clear_cpu(pcpu, need_tlb_flush);
2510         }
2511 }
2512
2513 static void kvmppc_start_thread(struct kvm_vcpu *vcpu, struct kvmppc_vcore *vc)
2514 {
2515         int cpu;
2516         struct paca_struct *tpaca;
2517         struct kvm *kvm = vc->kvm;
2518
2519         cpu = vc->pcpu;
2520         if (vcpu) {
2521                 if (vcpu->arch.timer_running) {
2522                         hrtimer_try_to_cancel(&vcpu->arch.dec_timer);
2523                         vcpu->arch.timer_running = 0;
2524                 }
2525                 cpu += vcpu->arch.ptid;
2526                 vcpu->cpu = vc->pcpu;
2527                 vcpu->arch.thread_cpu = cpu;
2528                 cpumask_set_cpu(cpu, &kvm->arch.cpu_in_guest);
2529         }
2530         tpaca = paca_ptrs[cpu];
2531         tpaca->kvm_hstate.kvm_vcpu = vcpu;
2532         tpaca->kvm_hstate.ptid = cpu - vc->pcpu;
2533         tpaca->kvm_hstate.fake_suspend = 0;
2534         /* Order stores to hstate.kvm_vcpu etc. before store to kvm_vcore */
2535         smp_wmb();
2536         tpaca->kvm_hstate.kvm_vcore = vc;
2537         if (cpu != smp_processor_id())
2538                 kvmppc_ipi_thread(cpu);
2539 }
2540
2541 static void kvmppc_wait_for_nap(int n_threads)
2542 {
2543         int cpu = smp_processor_id();
2544         int i, loops;
2545
2546         if (n_threads <= 1)
2547                 return;
2548         for (loops = 0; loops < 1000000; ++loops) {
2549                 /*
2550                  * Check if all threads are finished.
2551                  * We set the vcore pointer when starting a thread
2552                  * and the thread clears it when finished, so we look
2553                  * for any threads that still have a non-NULL vcore ptr.
2554                  */
2555                 for (i = 1; i < n_threads; ++i)
2556                         if (paca_ptrs[cpu + i]->kvm_hstate.kvm_vcore)
2557                                 break;
2558                 if (i == n_threads) {
2559                         HMT_medium();
2560                         return;
2561                 }
2562                 HMT_low();
2563         }
2564         HMT_medium();
2565         for (i = 1; i < n_threads; ++i)
2566                 if (paca_ptrs[cpu + i]->kvm_hstate.kvm_vcore)
2567                         pr_err("KVM: CPU %d seems to be stuck\n", cpu + i);
2568 }
2569
2570 /*
2571  * Check that we are on thread 0 and that any other threads in
2572  * this core are off-line.  Then grab the threads so they can't
2573  * enter the kernel.
2574  */
2575 static int on_primary_thread(void)
2576 {
2577         int cpu = smp_processor_id();
2578         int thr;
2579
2580         /* Are we on a primary subcore? */
2581         if (cpu_thread_in_subcore(cpu))
2582                 return 0;
2583
2584         thr = 0;
2585         while (++thr < threads_per_subcore)
2586                 if (cpu_online(cpu + thr))
2587                         return 0;
2588
2589         /* Grab all hw threads so they can't go into the kernel */
2590         for (thr = 1; thr < threads_per_subcore; ++thr) {
2591                 if (kvmppc_grab_hwthread(cpu + thr)) {
2592                         /* Couldn't grab one; let the others go */
2593                         do {
2594                                 kvmppc_release_hwthread(cpu + thr);
2595                         } while (--thr > 0);
2596                         return 0;
2597                 }
2598         }
2599         return 1;
2600 }
2601
2602 /*
2603  * A list of virtual cores for each physical CPU.
2604  * These are vcores that could run but their runner VCPU tasks are
2605  * (or may be) preempted.
2606  */
2607 struct preempted_vcore_list {
2608         struct list_head        list;
2609         spinlock_t              lock;
2610 };
2611
2612 static DEFINE_PER_CPU(struct preempted_vcore_list, preempted_vcores);
2613
2614 static void init_vcore_lists(void)
2615 {
2616         int cpu;
2617
2618         for_each_possible_cpu(cpu) {
2619                 struct preempted_vcore_list *lp = &per_cpu(preempted_vcores, cpu);
2620                 spin_lock_init(&lp->lock);
2621                 INIT_LIST_HEAD(&lp->list);
2622         }
2623 }
2624
2625 static void kvmppc_vcore_preempt(struct kvmppc_vcore *vc)
2626 {
2627         struct preempted_vcore_list *lp = this_cpu_ptr(&preempted_vcores);
2628
2629         vc->vcore_state = VCORE_PREEMPT;
2630         vc->pcpu = smp_processor_id();
2631         if (vc->num_threads < threads_per_vcore(vc->kvm)) {
2632                 spin_lock(&lp->lock);
2633                 list_add_tail(&vc->preempt_list, &lp->list);
2634                 spin_unlock(&lp->lock);
2635         }
2636
2637         /* Start accumulating stolen time */
2638         kvmppc_core_start_stolen(vc);
2639 }
2640
2641 static void kvmppc_vcore_end_preempt(struct kvmppc_vcore *vc)
2642 {
2643         struct preempted_vcore_list *lp;
2644
2645         kvmppc_core_end_stolen(vc);
2646         if (!list_empty(&vc->preempt_list)) {
2647                 lp = &per_cpu(preempted_vcores, vc->pcpu);
2648                 spin_lock(&lp->lock);
2649                 list_del_init(&vc->preempt_list);
2650                 spin_unlock(&lp->lock);
2651         }
2652         vc->vcore_state = VCORE_INACTIVE;
2653 }
2654
2655 /*
2656  * This stores information about the virtual cores currently
2657  * assigned to a physical core.
2658  */
2659 struct core_info {
2660         int             n_subcores;
2661         int             max_subcore_threads;
2662         int             total_threads;
2663         int             subcore_threads[MAX_SUBCORES];
2664         struct kvmppc_vcore *vc[MAX_SUBCORES];
2665 };
2666
2667 /*
2668  * This mapping means subcores 0 and 1 can use threads 0-3 and 4-7
2669  * respectively in 2-way micro-threading (split-core) mode on POWER8.
2670  */
2671 static int subcore_thread_map[MAX_SUBCORES] = { 0, 4, 2, 6 };
2672
2673 static void init_core_info(struct core_info *cip, struct kvmppc_vcore *vc)
2674 {
2675         memset(cip, 0, sizeof(*cip));
2676         cip->n_subcores = 1;
2677         cip->max_subcore_threads = vc->num_threads;
2678         cip->total_threads = vc->num_threads;
2679         cip->subcore_threads[0] = vc->num_threads;
2680         cip->vc[0] = vc;
2681 }
2682
2683 static bool subcore_config_ok(int n_subcores, int n_threads)
2684 {
2685         /*
2686          * POWER9 "SMT4" cores are permanently in what is effectively a 4-way
2687          * split-core mode, with one thread per subcore.
2688          */
2689         if (cpu_has_feature(CPU_FTR_ARCH_300))
2690                 return n_subcores <= 4 && n_threads == 1;
2691
2692         /* On POWER8, can only dynamically split if unsplit to begin with */
2693         if (n_subcores > 1 && threads_per_subcore < MAX_SMT_THREADS)
2694                 return false;
2695         if (n_subcores > MAX_SUBCORES)
2696                 return false;
2697         if (n_subcores > 1) {
2698                 if (!(dynamic_mt_modes & 2))
2699                         n_subcores = 4;
2700                 if (n_subcores > 2 && !(dynamic_mt_modes & 4))
2701                         return false;
2702         }
2703
2704         return n_subcores * roundup_pow_of_two(n_threads) <= MAX_SMT_THREADS;
2705 }
2706
2707 static void init_vcore_to_run(struct kvmppc_vcore *vc)
2708 {
2709         vc->entry_exit_map = 0;
2710         vc->in_guest = 0;
2711         vc->napping_threads = 0;
2712         vc->conferring_threads = 0;
2713         vc->tb_offset_applied = 0;
2714 }
2715
2716 static bool can_dynamic_split(struct kvmppc_vcore *vc, struct core_info *cip)
2717 {
2718         int n_threads = vc->num_threads;
2719         int sub;
2720
2721         if (!cpu_has_feature(CPU_FTR_ARCH_207S))
2722                 return false;
2723
2724         /* In one_vm_per_core mode, require all vcores to be from the same vm */
2725         if (one_vm_per_core && vc->kvm != cip->vc[0]->kvm)
2726                 return false;
2727
2728         /* Some POWER9 chips require all threads to be in the same MMU mode */
2729         if (no_mixing_hpt_and_radix &&
2730             kvm_is_radix(vc->kvm) != kvm_is_radix(cip->vc[0]->kvm))
2731                 return false;
2732
2733         if (n_threads < cip->max_subcore_threads)
2734                 n_threads = cip->max_subcore_threads;
2735         if (!subcore_config_ok(cip->n_subcores + 1, n_threads))
2736                 return false;
2737         cip->max_subcore_threads = n_threads;
2738
2739         sub = cip->n_subcores;
2740         ++cip->n_subcores;
2741         cip->total_threads += vc->num_threads;
2742         cip->subcore_threads[sub] = vc->num_threads;
2743         cip->vc[sub] = vc;
2744         init_vcore_to_run(vc);
2745         list_del_init(&vc->preempt_list);
2746
2747         return true;
2748 }
2749
2750 /*
2751  * Work out whether it is possible to piggyback the execution of
2752  * vcore *pvc onto the execution of the other vcores described in *cip.
2753  */
2754 static bool can_piggyback(struct kvmppc_vcore *pvc, struct core_info *cip,
2755                           int target_threads)
2756 {
2757         if (cip->total_threads + pvc->num_threads > target_threads)
2758                 return false;
2759
2760         return can_dynamic_split(pvc, cip);
2761 }
2762
2763 static void prepare_threads(struct kvmppc_vcore *vc)
2764 {
2765         int i;
2766         struct kvm_vcpu *vcpu;
2767
2768         for_each_runnable_thread(i, vcpu, vc) {
2769                 if (signal_pending(vcpu->arch.run_task))
2770                         vcpu->arch.ret = -EINTR;
2771                 else if (vcpu->arch.vpa.update_pending ||
2772                          vcpu->arch.slb_shadow.update_pending ||
2773                          vcpu->arch.dtl.update_pending)
2774                         vcpu->arch.ret = RESUME_GUEST;
2775                 else
2776                         continue;
2777                 kvmppc_remove_runnable(vc, vcpu);
2778                 wake_up(&vcpu->arch.cpu_run);
2779         }
2780 }
2781
2782 static void collect_piggybacks(struct core_info *cip, int target_threads)
2783 {
2784         struct preempted_vcore_list *lp = this_cpu_ptr(&preempted_vcores);
2785         struct kvmppc_vcore *pvc, *vcnext;
2786
2787         spin_lock(&lp->lock);
2788         list_for_each_entry_safe(pvc, vcnext, &lp->list, preempt_list) {
2789                 if (!spin_trylock(&pvc->lock))
2790                         continue;
2791                 prepare_threads(pvc);
2792                 if (!pvc->n_runnable) {
2793                         list_del_init(&pvc->preempt_list);
2794                         if (pvc->runner == NULL) {
2795                                 pvc->vcore_state = VCORE_INACTIVE;
2796                                 kvmppc_core_end_stolen(pvc);
2797                         }
2798                         spin_unlock(&pvc->lock);
2799                         continue;
2800                 }
2801                 if (!can_piggyback(pvc, cip, target_threads)) {
2802                         spin_unlock(&pvc->lock);
2803                         continue;
2804                 }
2805                 kvmppc_core_end_stolen(pvc);
2806                 pvc->vcore_state = VCORE_PIGGYBACK;
2807                 if (cip->total_threads >= target_threads)
2808                         break;
2809         }
2810         spin_unlock(&lp->lock);
2811 }
2812
2813 static bool recheck_signals(struct core_info *cip)
2814 {
2815         int sub, i;
2816         struct kvm_vcpu *vcpu;
2817
2818         for (sub = 0; sub < cip->n_subcores; ++sub)
2819                 for_each_runnable_thread(i, vcpu, cip->vc[sub])
2820                         if (signal_pending(vcpu->arch.run_task))
2821                                 return true;
2822         return false;
2823 }
2824
2825 static void post_guest_process(struct kvmppc_vcore *vc, bool is_master)
2826 {
2827         int still_running = 0, i;
2828         u64 now;
2829         long ret;
2830         struct kvm_vcpu *vcpu;
2831
2832         spin_lock(&vc->lock);
2833         now = get_tb();
2834         for_each_runnable_thread(i, vcpu, vc) {
2835                 /*
2836                  * It's safe to unlock the vcore in the loop here, because
2837                  * for_each_runnable_thread() is safe against removal of
2838                  * the vcpu, and the vcore state is VCORE_EXITING here,
2839                  * so any vcpus becoming runnable will have their arch.trap
2840                  * set to zero and can't actually run in the guest.
2841                  */
2842                 spin_unlock(&vc->lock);
2843                 /* cancel pending dec exception if dec is positive */
2844                 if (now < vcpu->arch.dec_expires &&
2845                     kvmppc_core_pending_dec(vcpu))
2846                         kvmppc_core_dequeue_dec(vcpu);
2847
2848                 trace_kvm_guest_exit(vcpu);
2849
2850                 ret = RESUME_GUEST;
2851                 if (vcpu->arch.trap)
2852                         ret = kvmppc_handle_exit_hv(vcpu->arch.kvm_run, vcpu,
2853                                                     vcpu->arch.run_task);
2854
2855                 vcpu->arch.ret = ret;
2856                 vcpu->arch.trap = 0;
2857
2858                 spin_lock(&vc->lock);
2859                 if (is_kvmppc_resume_guest(vcpu->arch.ret)) {
2860                         if (vcpu->arch.pending_exceptions)
2861                                 kvmppc_core_prepare_to_enter(vcpu);
2862                         if (vcpu->arch.ceded)
2863                                 kvmppc_set_timer(vcpu);
2864                         else
2865                                 ++still_running;
2866                 } else {
2867                         kvmppc_remove_runnable(vc, vcpu);
2868                         wake_up(&vcpu->arch.cpu_run);
2869                 }
2870         }
2871         if (!is_master) {
2872                 if (still_running > 0) {
2873                         kvmppc_vcore_preempt(vc);
2874                 } else if (vc->runner) {
2875                         vc->vcore_state = VCORE_PREEMPT;
2876                         kvmppc_core_start_stolen(vc);
2877                 } else {
2878                         vc->vcore_state = VCORE_INACTIVE;
2879                 }
2880                 if (vc->n_runnable > 0 && vc->runner == NULL) {
2881                         /* make sure there's a candidate runner awake */
2882                         i = -1;
2883                         vcpu = next_runnable_thread(vc, &i);
2884                         wake_up(&vcpu->arch.cpu_run);
2885                 }
2886         }
2887         spin_unlock(&vc->lock);
2888 }
2889
2890 /*
2891  * Clear core from the list of active host cores as we are about to
2892  * enter the guest. Only do this if it is the primary thread of the
2893  * core (not if a subcore) that is entering the guest.
2894  */
2895 static inline int kvmppc_clear_host_core(unsigned int cpu)
2896 {
2897         int core;
2898
2899         if (!kvmppc_host_rm_ops_hv || cpu_thread_in_core(cpu))
2900                 return 0;
2901         /*
2902          * Memory barrier can be omitted here as we will do a smp_wmb()
2903          * later in kvmppc_start_thread and we need ensure that state is
2904          * visible to other CPUs only after we enter guest.
2905          */
2906         core = cpu >> threads_shift;
2907         kvmppc_host_rm_ops_hv->rm_core[core].rm_state.in_host = 0;
2908         return 0;
2909 }
2910
2911 /*
2912  * Advertise this core as an active host core since we exited the guest
2913  * Only need to do this if it is the primary thread of the core that is
2914  * exiting.
2915  */
2916 static inline int kvmppc_set_host_core(unsigned int cpu)
2917 {
2918         int core;
2919
2920         if (!kvmppc_host_rm_ops_hv || cpu_thread_in_core(cpu))
2921                 return 0;
2922
2923         /*
2924          * Memory barrier can be omitted here because we do a spin_unlock
2925          * immediately after this which provides the memory barrier.
2926          */
2927         core = cpu >> threads_shift;
2928         kvmppc_host_rm_ops_hv->rm_core[core].rm_state.in_host = 1;
2929         return 0;
2930 }
2931
2932 static void set_irq_happened(int trap)
2933 {
2934         switch (trap) {
2935         case BOOK3S_INTERRUPT_EXTERNAL:
2936                 local_paca->irq_happened |= PACA_IRQ_EE;
2937                 break;
2938         case BOOK3S_INTERRUPT_H_DOORBELL:
2939                 local_paca->irq_happened |= PACA_IRQ_DBELL;
2940                 break;
2941         case BOOK3S_INTERRUPT_HMI:
2942                 local_paca->irq_happened |= PACA_IRQ_HMI;
2943                 break;
2944         case BOOK3S_INTERRUPT_SYSTEM_RESET:
2945                 replay_system_reset();
2946                 break;
2947         }
2948 }
2949
2950 /*
2951  * Run a set of guest threads on a physical core.
2952  * Called with vc->lock held.
2953  */
2954 static noinline void kvmppc_run_core(struct kvmppc_vcore *vc)
2955 {
2956         struct kvm_vcpu *vcpu;
2957         int i;
2958         int srcu_idx;
2959         struct core_info core_info;
2960         struct kvmppc_vcore *pvc;
2961         struct kvm_split_mode split_info, *sip;
2962         int split, subcore_size, active;
2963         int sub;
2964         bool thr0_done;
2965         unsigned long cmd_bit, stat_bit;
2966         int pcpu, thr;
2967         int target_threads;
2968         int controlled_threads;
2969         int trap;
2970         bool is_power8;
2971         bool hpt_on_radix;
2972
2973         /*
2974          * Remove from the list any threads that have a signal pending
2975          * or need a VPA update done
2976          */
2977         prepare_threads(vc);
2978
2979         /* if the runner is no longer runnable, let the caller pick a new one */
2980         if (vc->runner->arch.state != KVMPPC_VCPU_RUNNABLE)
2981                 return;
2982
2983         /*
2984          * Initialize *vc.
2985          */
2986         init_vcore_to_run(vc);
2987         vc->preempt_tb = TB_NIL;
2988
2989         /*
2990          * Number of threads that we will be controlling: the same as
2991          * the number of threads per subcore, except on POWER9,
2992          * where it's 1 because the threads are (mostly) independent.
2993          */
2994         controlled_threads = threads_per_vcore(vc->kvm);
2995
2996         /*
2997          * Make sure we are running on primary threads, and that secondary
2998          * threads are offline.  Also check if the number of threads in this
2999          * guest are greater than the current system threads per guest.
3000          * On POWER9, we need to be not in independent-threads mode if
3001          * this is a HPT guest on a radix host machine where the
3002          * CPU threads may not be in different MMU modes.
3003          */
3004         hpt_on_radix = no_mixing_hpt_and_radix && radix_enabled() &&
3005                 !kvm_is_radix(vc->kvm);
3006         if (((controlled_threads > 1) &&
3007              ((vc->num_threads > threads_per_subcore) || !on_primary_thread())) ||
3008             (hpt_on_radix && vc->kvm->arch.threads_indep)) {
3009                 for_each_runnable_thread(i, vcpu, vc) {
3010                         vcpu->arch.ret = -EBUSY;
3011                         kvmppc_remove_runnable(vc, vcpu);
3012                         wake_up(&vcpu->arch.cpu_run);
3013                 }
3014                 goto out;
3015         }
3016
3017         /*
3018          * See if we could run any other vcores on the physical core
3019          * along with this one.
3020          */
3021         init_core_info(&core_info, vc);
3022         pcpu = smp_processor_id();
3023         target_threads = controlled_threads;
3024         if (target_smt_mode && target_smt_mode < target_threads)
3025                 target_threads = target_smt_mode;
3026         if (vc->num_threads < target_threads)
3027                 collect_piggybacks(&core_info, target_threads);
3028
3029         /*
3030          * On radix, arrange for TLB flushing if necessary.
3031          * This has to be done before disabling interrupts since
3032          * it uses smp_call_function().
3033          */
3034         pcpu = smp_processor_id();
3035         if (kvm_is_radix(vc->kvm)) {
3036                 for (sub = 0; sub < core_info.n_subcores; ++sub)
3037                         for_each_runnable_thread(i, vcpu, core_info.vc[sub])
3038                                 kvmppc_prepare_radix_vcpu(vcpu, pcpu);
3039         }
3040
3041         /*
3042          * Hard-disable interrupts, and check resched flag and signals.
3043          * If we need to reschedule or deliver a signal, clean up
3044          * and return without going into the guest(s).
3045          * If the mmu_ready flag has been cleared, don't go into the
3046          * guest because that means a HPT resize operation is in progress.
3047          */
3048         local_irq_disable();
3049         hard_irq_disable();
3050         if (lazy_irq_pending() || need_resched() ||
3051             recheck_signals(&core_info) || !vc->kvm->arch.mmu_ready) {
3052                 local_irq_enable();
3053                 vc->vcore_state = VCORE_INACTIVE;
3054                 /* Unlock all except the primary vcore */
3055                 for (sub = 1; sub < core_info.n_subcores; ++sub) {
3056                         pvc = core_info.vc[sub];
3057                         /* Put back on to the preempted vcores list */
3058                         kvmppc_vcore_preempt(pvc);
3059                         spin_unlock(&pvc->lock);
3060                 }
3061                 for (i = 0; i < controlled_threads; ++i)
3062                         kvmppc_release_hwthread(pcpu + i);
3063                 return;
3064         }
3065
3066         kvmppc_clear_host_core(pcpu);
3067
3068         /* Decide on micro-threading (split-core) mode */
3069         subcore_size = threads_per_subcore;
3070         cmd_bit = stat_bit = 0;
3071         split = core_info.n_subcores;
3072         sip = NULL;
3073         is_power8 = cpu_has_feature(CPU_FTR_ARCH_207S)
3074                 && !cpu_has_feature(CPU_FTR_ARCH_300);
3075
3076         if (split > 1 || hpt_on_radix) {
3077                 sip = &split_info;
3078                 memset(&split_info, 0, sizeof(split_info));
3079                 for (sub = 0; sub < core_info.n_subcores; ++sub)
3080                         split_info.vc[sub] = core_info.vc[sub];
3081
3082                 if (is_power8) {
3083                         if (split == 2 && (dynamic_mt_modes & 2)) {
3084                                 cmd_bit = HID0_POWER8_1TO2LPAR;
3085                                 stat_bit = HID0_POWER8_2LPARMODE;
3086                         } else {
3087                                 split = 4;
3088                                 cmd_bit = HID0_POWER8_1TO4LPAR;
3089                                 stat_bit = HID0_POWER8_4LPARMODE;
3090                         }
3091                         subcore_size = MAX_SMT_THREADS / split;
3092                         split_info.rpr = mfspr(SPRN_RPR);
3093                         split_info.pmmar = mfspr(SPRN_PMMAR);
3094                         split_info.ldbar = mfspr(SPRN_LDBAR);
3095                         split_info.subcore_size = subcore_size;
3096                 } else {
3097                         split_info.subcore_size = 1;
3098                         if (hpt_on_radix) {
3099                                 /* Use the split_info for LPCR/LPIDR changes */
3100                                 split_info.lpcr_req = vc->lpcr;
3101                                 split_info.lpidr_req = vc->kvm->arch.lpid;
3102                                 split_info.host_lpcr = vc->kvm->arch.host_lpcr;
3103                                 split_info.do_set = 1;
3104                         }
3105                 }
3106
3107                 /* order writes to split_info before kvm_split_mode pointer */
3108                 smp_wmb();
3109         }
3110
3111         for (thr = 0; thr < controlled_threads; ++thr) {
3112                 struct paca_struct *paca = paca_ptrs[pcpu + thr];
3113
3114                 paca->kvm_hstate.tid = thr;
3115                 paca->kvm_hstate.napping = 0;
3116                 paca->kvm_hstate.kvm_split_mode = sip;
3117         }
3118
3119         /* Initiate micro-threading (split-core) on POWER8 if required */
3120         if (cmd_bit) {
3121                 unsigned long hid0 = mfspr(SPRN_HID0);
3122
3123                 hid0 |= cmd_bit | HID0_POWER8_DYNLPARDIS;
3124                 mb();
3125                 mtspr(SPRN_HID0, hid0);
3126                 isync();
3127                 for (;;) {
3128                         hid0 = mfspr(SPRN_HID0);
3129                         if (hid0 & stat_bit)
3130                                 break;
3131                         cpu_relax();
3132                 }
3133         }
3134
3135         /*
3136          * On POWER8, set RWMR register.
3137          * Since it only affects PURR and SPURR, it doesn't affect
3138          * the host, so we don't save/restore the host value.
3139          */
3140         if (is_power8) {
3141                 unsigned long rwmr_val = RWMR_RPA_P8_8THREAD;
3142                 int n_online = atomic_read(&vc->online_count);
3143
3144                 /*
3145                  * Use the 8-thread value if we're doing split-core
3146                  * or if the vcore's online count looks bogus.
3147                  */
3148                 if (split == 1 && threads_per_subcore == MAX_SMT_THREADS &&
3149                     n_online >= 1 && n_online <= MAX_SMT_THREADS)
3150                         rwmr_val = p8_rwmr_values[n_online];
3151                 mtspr(SPRN_RWMR, rwmr_val);
3152         }
3153
3154         /* Start all the threads */
3155         active = 0;
3156         for (sub = 0; sub < core_info.n_subcores; ++sub) {
3157                 thr = is_power8 ? subcore_thread_map[sub] : sub;
3158                 thr0_done = false;
3159                 active |= 1 << thr;
3160                 pvc = core_info.vc[sub];
3161                 pvc->pcpu = pcpu + thr;
3162                 for_each_runnable_thread(i, vcpu, pvc) {
3163                         kvmppc_start_thread(vcpu, pvc);
3164                         kvmppc_create_dtl_entry(vcpu, pvc);
3165                         trace_kvm_guest_enter(vcpu);
3166                         if (!vcpu->arch.ptid)
3167                                 thr0_done = true;
3168                         active |= 1 << (thr + vcpu->arch.ptid);
3169                 }
3170                 /*
3171                  * We need to start the first thread of each subcore
3172                  * even if it doesn't have a vcpu.
3173                  */
3174                 if (!thr0_done)
3175                         kvmppc_start_thread(NULL, pvc);
3176         }
3177
3178         /*
3179          * Ensure that split_info.do_nap is set after setting
3180          * the vcore pointer in the PACA of the secondaries.
3181          */
3182         smp_mb();
3183
3184         /*
3185          * When doing micro-threading, poke the inactive threads as well.
3186          * This gets them to the nap instruction after kvm_do_nap,
3187          * which reduces the time taken to unsplit later.
3188          * For POWER9 HPT guest on radix host, we need all the secondary
3189          * threads woken up so they can do the LPCR/LPIDR change.
3190          */
3191         if (cmd_bit || hpt_on_radix) {
3192                 split_info.do_nap = 1;  /* ask secondaries to nap when done */
3193                 for (thr = 1; thr < threads_per_subcore; ++thr)
3194                         if (!(active & (1 << thr)))
3195                                 kvmppc_ipi_thread(pcpu + thr);
3196         }
3197
3198         vc->vcore_state = VCORE_RUNNING;
3199         preempt_disable();
3200
3201         trace_kvmppc_run_core(vc, 0);
3202
3203         for (sub = 0; sub < core_info.n_subcores; ++sub)
3204                 spin_unlock(&core_info.vc[sub]->lock);
3205
3206         if (kvm_is_radix(vc->kvm)) {
3207                 /*
3208                  * Do we need to flush the process scoped TLB for the LPAR?
3209                  *
3210                  * On POWER9, individual threads can come in here, but the
3211                  * TLB is shared between the 4 threads in a core, hence
3212                  * invalidating on one thread invalidates for all.
3213                  * Thus we make all 4 threads use the same bit here.
3214                  *
3215                  * Hash must be flushed in realmode in order to use tlbiel.
3216                  */
3217                 kvmppc_radix_check_need_tlb_flush(vc->kvm, pcpu, NULL);
3218         }
3219
3220         /*
3221          * Interrupts will be enabled once we get into the guest,
3222          * so tell lockdep that we're about to enable interrupts.
3223          */
3224         trace_hardirqs_on();
3225
3226         guest_enter_irqoff();
3227
3228         srcu_idx = srcu_read_lock(&vc->kvm->srcu);
3229
3230         this_cpu_disable_ftrace();
3231
3232         trap = __kvmppc_vcore_entry();
3233
3234         this_cpu_enable_ftrace();
3235
3236         srcu_read_unlock(&vc->kvm->srcu, srcu_idx);
3237
3238         trace_hardirqs_off();
3239         set_irq_happened(trap);
3240
3241         spin_lock(&vc->lock);
3242         /* prevent other vcpu threads from doing kvmppc_start_thread() now */
3243         vc->vcore_state = VCORE_EXITING;
3244
3245         /* wait for secondary threads to finish writing their state to memory */
3246         kvmppc_wait_for_nap(controlled_threads);
3247
3248         /* Return to whole-core mode if we split the core earlier */
3249         if (cmd_bit) {
3250                 unsigned long hid0 = mfspr(SPRN_HID0);
3251                 unsigned long loops = 0;
3252
3253                 hid0 &= ~HID0_POWER8_DYNLPARDIS;
3254                 stat_bit = HID0_POWER8_2LPARMODE | HID0_POWER8_4LPARMODE;
3255                 mb();
3256                 mtspr(SPRN_HID0, hid0);
3257                 isync();
3258                 for (;;) {
3259                         hid0 = mfspr(SPRN_HID0);
3260                         if (!(hid0 & stat_bit))
3261                                 break;
3262                         cpu_relax();
3263                         ++loops;
3264                 }
3265         } else if (hpt_on_radix) {
3266                 /* Wait for all threads to have seen final sync */
3267                 for (thr = 1; thr < controlled_threads; ++thr) {
3268                         struct paca_struct *paca = paca_ptrs[pcpu + thr];
3269
3270                         while (paca->kvm_hstate.kvm_split_mode) {
3271                                 HMT_low();
3272                                 barrier();
3273                         }
3274                         HMT_medium();
3275                 }
3276         }
3277         split_info.do_nap = 0;
3278
3279         kvmppc_set_host_core(pcpu);
3280
3281         local_irq_enable();
3282         guest_exit();
3283
3284         /* Let secondaries go back to the offline loop */
3285         for (i = 0; i < controlled_threads; ++i) {
3286                 kvmppc_release_hwthread(pcpu + i);
3287                 if (sip && sip->napped[i])
3288                         kvmppc_ipi_thread(pcpu + i);
3289                 cpumask_clear_cpu(pcpu + i, &vc->kvm->arch.cpu_in_guest);
3290         }
3291
3292         spin_unlock(&vc->lock);
3293
3294         /* make sure updates to secondary vcpu structs are visible now */
3295         smp_mb();
3296
3297         preempt_enable();
3298
3299         for (sub = 0; sub < core_info.n_subcores; ++sub) {
3300                 pvc = core_info.vc[sub];
3301                 post_guest_process(pvc, pvc == vc);
3302         }
3303
3304         spin_lock(&vc->lock);
3305
3306  out:
3307         vc->vcore_state = VCORE_INACTIVE;
3308         trace_kvmppc_run_core(vc, 1);
3309 }
3310
3311 /*
3312  * Load up hypervisor-mode registers on P9.
3313  */
3314 static int kvmhv_load_hv_regs_and_go(struct kvm_vcpu *vcpu, u64 time_limit,
3315                                      unsigned long lpcr)
3316 {
3317         struct kvmppc_vcore *vc = vcpu->arch.vcore;
3318         s64 hdec;
3319         u64 tb, purr, spurr;
3320         int trap;
3321         unsigned long host_hfscr = mfspr(SPRN_HFSCR);
3322         unsigned long host_ciabr = mfspr(SPRN_CIABR);
3323         unsigned long host_dawr = mfspr(SPRN_DAWR);
3324         unsigned long host_dawrx = mfspr(SPRN_DAWRX);
3325         unsigned long host_psscr = mfspr(SPRN_PSSCR);
3326         unsigned long host_pidr = mfspr(SPRN_PID);
3327
3328         hdec = time_limit - mftb();
3329         if (hdec < 0)
3330                 return BOOK3S_INTERRUPT_HV_DECREMENTER;
3331         mtspr(SPRN_HDEC, hdec);
3332
3333         if (vc->tb_offset) {
3334                 u64 new_tb = mftb() + vc->tb_offset;
3335                 mtspr(SPRN_TBU40, new_tb);
3336                 tb = mftb();
3337                 if ((tb & 0xffffff) < (new_tb & 0xffffff))
3338                         mtspr(SPRN_TBU40, new_tb + 0x1000000);
3339                 vc->tb_offset_applied = vc->tb_offset;
3340         }
3341
3342         if (vc->pcr)
3343                 mtspr(SPRN_PCR, vc->pcr);
3344         mtspr(SPRN_DPDES, vc->dpdes);
3345         mtspr(SPRN_VTB, vc->vtb);
3346
3347         local_paca->kvm_hstate.host_purr = mfspr(SPRN_PURR);
3348         local_paca->kvm_hstate.host_spurr = mfspr(SPRN_SPURR);
3349         mtspr(SPRN_PURR, vcpu->arch.purr);
3350         mtspr(SPRN_SPURR, vcpu->arch.spurr);
3351
3352         if (cpu_has_feature(CPU_FTR_DAWR)) {
3353                 mtspr(SPRN_DAWR, vcpu->arch.dawr);
3354                 mtspr(SPRN_DAWRX, vcpu->arch.dawrx);
3355         }
3356         mtspr(SPRN_CIABR, vcpu->arch.ciabr);
3357         mtspr(SPRN_IC, vcpu->arch.ic);
3358         mtspr(SPRN_PID, vcpu->arch.pid);
3359
3360         mtspr(SPRN_PSSCR, vcpu->arch.psscr | PSSCR_EC |
3361               (local_paca->kvm_hstate.fake_suspend << PSSCR_FAKE_SUSPEND_LG));
3362
3363         mtspr(SPRN_HFSCR, vcpu->arch.hfscr);
3364
3365         mtspr(SPRN_SPRG0, vcpu->arch.shregs.sprg0);
3366         mtspr(SPRN_SPRG1, vcpu->arch.shregs.sprg1);
3367         mtspr(SPRN_SPRG2, vcpu->arch.shregs.sprg2);
3368         mtspr(SPRN_SPRG3, vcpu->arch.shregs.sprg3);
3369
3370         mtspr(SPRN_AMOR, ~0UL);
3371
3372         mtspr(SPRN_LPCR, lpcr);
3373         isync();
3374
3375         kvmppc_xive_push_vcpu(vcpu);
3376
3377         mtspr(SPRN_SRR0, vcpu->arch.shregs.srr0);
3378         mtspr(SPRN_SRR1, vcpu->arch.shregs.srr1);
3379
3380         trap = __kvmhv_vcpu_entry_p9(vcpu);
3381
3382         /* Advance host PURR/SPURR by the amount used by guest */
3383         purr = mfspr(SPRN_PURR);
3384         spurr = mfspr(SPRN_SPURR);
3385         mtspr(SPRN_PURR, local_paca->kvm_hstate.host_purr +
3386               purr - vcpu->arch.purr);
3387         mtspr(SPRN_SPURR, local_paca->kvm_hstate.host_spurr +
3388               spurr - vcpu->arch.spurr);
3389         vcpu->arch.purr = purr;
3390         vcpu->arch.spurr = spurr;
3391
3392         vcpu->arch.ic = mfspr(SPRN_IC);
3393         vcpu->arch.pid = mfspr(SPRN_PID);
3394         vcpu->arch.psscr = mfspr(SPRN_PSSCR) & PSSCR_GUEST_VIS;
3395
3396         vcpu->arch.shregs.sprg0 = mfspr(SPRN_SPRG0);
3397         vcpu->arch.shregs.sprg1 = mfspr(SPRN_SPRG1);
3398         vcpu->arch.shregs.sprg2 = mfspr(SPRN_SPRG2);
3399         vcpu->arch.shregs.sprg3 = mfspr(SPRN_SPRG3);
3400
3401         mtspr(SPRN_PSSCR, host_psscr);
3402         mtspr(SPRN_HFSCR, host_hfscr);
3403         mtspr(SPRN_CIABR, host_ciabr);
3404         mtspr(SPRN_DAWR, host_dawr);
3405         mtspr(SPRN_DAWRX, host_dawrx);
3406         mtspr(SPRN_PID, host_pidr);
3407
3408         /*
3409          * Since this is radix, do a eieio; tlbsync; ptesync sequence in
3410          * case we interrupted the guest between a tlbie and a ptesync.
3411          */
3412         asm volatile("eieio; tlbsync; ptesync");
3413
3414         mtspr(SPRN_LPID, vcpu->kvm->arch.host_lpid);    /* restore host LPID */
3415         isync();
3416
3417         vc->dpdes = mfspr(SPRN_DPDES);
3418         vc->vtb = mfspr(SPRN_VTB);
3419         mtspr(SPRN_DPDES, 0);
3420         if (vc->pcr)
3421                 mtspr(SPRN_PCR, 0);
3422
3423         if (vc->tb_offset_applied) {
3424                 u64 new_tb = mftb() - vc->tb_offset_applied;
3425                 mtspr(SPRN_TBU40, new_tb);
3426                 tb = mftb();
3427                 if ((tb & 0xffffff) < (new_tb & 0xffffff))
3428                         mtspr(SPRN_TBU40, new_tb + 0x1000000);
3429                 vc->tb_offset_applied = 0;
3430         }
3431
3432         mtspr(SPRN_HDEC, 0x7fffffff);
3433         mtspr(SPRN_LPCR, vcpu->kvm->arch.host_lpcr);
3434
3435         return trap;
3436 }
3437
3438 /*
3439  * Virtual-mode guest entry for POWER9 and later when the host and
3440  * guest are both using the radix MMU.  The LPIDR has already been set.
3441  */
3442 int kvmhv_p9_guest_entry(struct kvm_vcpu *vcpu, u64 time_limit,
3443                          unsigned long lpcr)
3444 {
3445         struct kvmppc_vcore *vc = vcpu->arch.vcore;
3446         unsigned long host_dscr = mfspr(SPRN_DSCR);
3447         unsigned long host_tidr = mfspr(SPRN_TIDR);
3448         unsigned long host_iamr = mfspr(SPRN_IAMR);
3449         s64 dec;
3450         u64 tb;
3451         int trap, save_pmu;
3452
3453         dec = mfspr(SPRN_DEC);
3454         tb = mftb();
3455         if (dec < 512)
3456                 return BOOK3S_INTERRUPT_HV_DECREMENTER;
3457         local_paca->kvm_hstate.dec_expires = dec + tb;
3458         if (local_paca->kvm_hstate.dec_expires < time_limit)
3459                 time_limit = local_paca->kvm_hstate.dec_expires;
3460
3461         vcpu->arch.ceded = 0;
3462
3463         kvmhv_save_host_pmu();          /* saves it to PACA kvm_hstate */
3464
3465         kvmppc_subcore_enter_guest();
3466
3467         vc->entry_exit_map = 1;
3468         vc->in_guest = 1;
3469
3470         if (vcpu->arch.vpa.pinned_addr) {
3471                 struct lppaca *lp = vcpu->arch.vpa.pinned_addr;
3472                 u32 yield_count = be32_to_cpu(lp->yield_count) + 1;
3473                 lp->yield_count = cpu_to_be32(yield_count);
3474                 vcpu->arch.vpa.dirty = 1;
3475         }
3476
3477         if (cpu_has_feature(CPU_FTR_TM) ||
3478             cpu_has_feature(CPU_FTR_P9_TM_HV_ASSIST))
3479                 kvmppc_restore_tm_hv(vcpu, vcpu->arch.shregs.msr, true);
3480
3481         kvmhv_load_guest_pmu(vcpu);
3482
3483         msr_check_and_set(MSR_FP | MSR_VEC | MSR_VSX);
3484         load_fp_state(&vcpu->arch.fp);
3485 #ifdef CONFIG_ALTIVEC
3486         load_vr_state(&vcpu->arch.vr);
3487 #endif
3488
3489         mtspr(SPRN_DSCR, vcpu->arch.dscr);
3490         mtspr(SPRN_IAMR, vcpu->arch.iamr);
3491         mtspr(SPRN_PSPB, vcpu->arch.pspb);
3492         mtspr(SPRN_FSCR, vcpu->arch.fscr);
3493         mtspr(SPRN_TAR, vcpu->arch.tar);
3494         mtspr(SPRN_EBBHR, vcpu->arch.ebbhr);
3495         mtspr(SPRN_EBBRR, vcpu->arch.ebbrr);
3496         mtspr(SPRN_BESCR, vcpu->arch.bescr);
3497         mtspr(SPRN_WORT, vcpu->arch.wort);
3498         mtspr(SPRN_TIDR, vcpu->arch.tid);
3499         mtspr(SPRN_DAR, vcpu->arch.shregs.dar);
3500         mtspr(SPRN_DSISR, vcpu->arch.shregs.dsisr);
3501         mtspr(SPRN_AMR, vcpu->arch.amr);
3502         mtspr(SPRN_UAMOR, vcpu->arch.uamor);
3503
3504         if (!(vcpu->arch.ctrl & 1))
3505                 mtspr(SPRN_CTRLT, mfspr(SPRN_CTRLF) & ~1);
3506
3507         mtspr(SPRN_DEC, vcpu->arch.dec_expires - mftb());
3508
3509         if (kvmhv_on_pseries()) {
3510                 /* call our hypervisor to load up HV regs and go */
3511                 struct hv_guest_state hvregs;
3512
3513                 kvmhv_save_hv_regs(vcpu, &hvregs);
3514                 hvregs.lpcr = lpcr;
3515                 vcpu->arch.regs.msr = vcpu->arch.shregs.msr;
3516                 hvregs.version = HV_GUEST_STATE_VERSION;
3517                 if (vcpu->arch.nested) {
3518                         hvregs.lpid = vcpu->arch.nested->shadow_lpid;
3519                         hvregs.vcpu_token = vcpu->arch.nested_vcpu_id;
3520                 } else {
3521                         hvregs.lpid = vcpu->kvm->arch.lpid;
3522                         hvregs.vcpu_token = vcpu->vcpu_id;
3523                 }
3524                 hvregs.hdec_expiry = time_limit;
3525                 trap = plpar_hcall_norets(H_ENTER_NESTED, __pa(&hvregs),
3526                                           __pa(&vcpu->arch.regs));
3527                 kvmhv_restore_hv_return_state(vcpu, &hvregs);
3528                 vcpu->arch.shregs.msr = vcpu->arch.regs.msr;
3529                 vcpu->arch.shregs.dar = mfspr(SPRN_DAR);
3530                 vcpu->arch.shregs.dsisr = mfspr(SPRN_DSISR);
3531
3532                 /* H_CEDE has to be handled now, not later */
3533                 if (trap == BOOK3S_INTERRUPT_SYSCALL && !vcpu->arch.nested &&
3534                     kvmppc_get_gpr(vcpu, 3) == H_CEDE) {
3535                         kvmppc_nested_cede(vcpu);
3536                         trap = 0;
3537                 }
3538         } else {
3539                 trap = kvmhv_load_hv_regs_and_go(vcpu, time_limit, lpcr);
3540         }
3541
3542         vcpu->arch.slb_max = 0;
3543         dec = mfspr(SPRN_DEC);
3544         tb = mftb();
3545         vcpu->arch.dec_expires = dec + tb;
3546         vcpu->cpu = -1;
3547         vcpu->arch.thread_cpu = -1;
3548         vcpu->arch.ctrl = mfspr(SPRN_CTRLF);
3549
3550         vcpu->arch.iamr = mfspr(SPRN_IAMR);
3551         vcpu->arch.pspb = mfspr(SPRN_PSPB);
3552         vcpu->arch.fscr = mfspr(SPRN_FSCR);
3553         vcpu->arch.tar = mfspr(SPRN_TAR);
3554         vcpu->arch.ebbhr = mfspr(SPRN_EBBHR);
3555         vcpu->arch.ebbrr = mfspr(SPRN_EBBRR);
3556         vcpu->arch.bescr = mfspr(SPRN_BESCR);
3557         vcpu->arch.wort = mfspr(SPRN_WORT);
3558         vcpu->arch.tid = mfspr(SPRN_TIDR);
3559         vcpu->arch.amr = mfspr(SPRN_AMR);
3560         vcpu->arch.uamor = mfspr(SPRN_UAMOR);
3561         vcpu->arch.dscr = mfspr(SPRN_DSCR);
3562
3563         mtspr(SPRN_PSPB, 0);
3564         mtspr(SPRN_WORT, 0);
3565         mtspr(SPRN_AMR, 0);
3566         mtspr(SPRN_UAMOR, 0);
3567         mtspr(SPRN_DSCR, host_dscr);
3568         mtspr(SPRN_TIDR, host_tidr);
3569         mtspr(SPRN_IAMR, host_iamr);
3570         mtspr(SPRN_PSPB, 0);
3571
3572         msr_check_and_set(MSR_FP | MSR_VEC | MSR_VSX);
3573         store_fp_state(&vcpu->arch.fp);
3574 #ifdef CONFIG_ALTIVEC
3575         store_vr_state(&vcpu->arch.vr);
3576 #endif
3577
3578         if (cpu_has_feature(CPU_FTR_TM) ||
3579             cpu_has_feature(CPU_FTR_P9_TM_HV_ASSIST))
3580                 kvmppc_save_tm_hv(vcpu, vcpu->arch.shregs.msr, true);
3581
3582         save_pmu = 1;
3583         if (vcpu->arch.vpa.pinned_addr) {
3584                 struct lppaca *lp = vcpu->arch.vpa.pinned_addr;
3585                 u32 yield_count = be32_to_cpu(lp->yield_count) + 1;
3586                 lp->yield_count = cpu_to_be32(yield_count);
3587                 vcpu->arch.vpa.dirty = 1;
3588                 save_pmu = lp->pmcregs_in_use;
3589         }
3590
3591         kvmhv_save_guest_pmu(vcpu, save_pmu);
3592
3593         vc->entry_exit_map = 0x101;
3594         vc->in_guest = 0;
3595
3596         mtspr(SPRN_DEC, local_paca->kvm_hstate.dec_expires - mftb());
3597
3598         kvmhv_load_host_pmu();
3599
3600         kvmppc_subcore_exit_guest();
3601
3602         return trap;
3603 }
3604
3605 /*
3606  * Wait for some other vcpu thread to execute us, and
3607  * wake us up when we need to handle something in the host.
3608  */
3609 static void kvmppc_wait_for_exec(struct kvmppc_vcore *vc,
3610                                  struct kvm_vcpu *vcpu, int wait_state)
3611 {
3612         DEFINE_WAIT(wait);
3613
3614         prepare_to_wait(&vcpu->arch.cpu_run, &wait, wait_state);
3615         if (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE) {
3616                 spin_unlock(&vc->lock);
3617                 schedule();
3618                 spin_lock(&vc->lock);
3619         }
3620         finish_wait(&vcpu->arch.cpu_run, &wait);
3621 }
3622
3623 static void grow_halt_poll_ns(struct kvmppc_vcore *vc)
3624 {
3625         /* 10us base */
3626         if (vc->halt_poll_ns == 0 && halt_poll_ns_grow)
3627                 vc->halt_poll_ns = 10000;
3628         else
3629                 vc->halt_poll_ns *= halt_poll_ns_grow;
3630 }
3631
3632 static void shrink_halt_poll_ns(struct kvmppc_vcore *vc)
3633 {
3634         if (halt_poll_ns_shrink == 0)
3635                 vc->halt_poll_ns = 0;
3636         else
3637                 vc->halt_poll_ns /= halt_poll_ns_shrink;
3638 }
3639
3640 #ifdef CONFIG_KVM_XICS
3641 static inline bool xive_interrupt_pending(struct kvm_vcpu *vcpu)
3642 {
3643         if (!xive_enabled())
3644                 return false;
3645         return vcpu->arch.irq_pending || vcpu->arch.xive_saved_state.pipr <
3646                 vcpu->arch.xive_saved_state.cppr;
3647 }
3648 #else
3649 static inline bool xive_interrupt_pending(struct kvm_vcpu *vcpu)
3650 {
3651         return false;
3652 }
3653 #endif /* CONFIG_KVM_XICS */
3654
3655 static bool kvmppc_vcpu_woken(struct kvm_vcpu *vcpu)
3656 {
3657         if (vcpu->arch.pending_exceptions || vcpu->arch.prodded ||
3658             kvmppc_doorbell_pending(vcpu) || xive_interrupt_pending(vcpu))
3659                 return true;
3660
3661         return false;
3662 }
3663
3664 /*
3665  * Check to see if any of the runnable vcpus on the vcore have pending
3666  * exceptions or are no longer ceded
3667  */
3668 static int kvmppc_vcore_check_block(struct kvmppc_vcore *vc)
3669 {
3670         struct kvm_vcpu *vcpu;
3671         int i;
3672
3673         for_each_runnable_thread(i, vcpu, vc) {
3674                 if (!vcpu->arch.ceded || kvmppc_vcpu_woken(vcpu))
3675                         return 1;
3676         }
3677
3678         return 0;
3679 }
3680
3681 /*
3682  * All the vcpus in this vcore are idle, so wait for a decrementer
3683  * or external interrupt to one of the vcpus.  vc->lock is held.
3684  */
3685 static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
3686 {
3687         ktime_t cur, start_poll, start_wait;
3688         int do_sleep = 1;
3689         u64 block_ns;
3690         DECLARE_SWAITQUEUE(wait);
3691
3692         /* Poll for pending exceptions and ceded state */
3693         cur = start_poll = ktime_get();
3694         if (vc->halt_poll_ns) {
3695                 ktime_t stop = ktime_add_ns(start_poll, vc->halt_poll_ns);
3696                 ++vc->runner->stat.halt_attempted_poll;
3697
3698                 vc->vcore_state = VCORE_POLLING;
3699                 spin_unlock(&vc->lock);
3700
3701                 do {
3702                         if (kvmppc_vcore_check_block(vc)) {
3703                                 do_sleep = 0;
3704                                 break;
3705                         }
3706                         cur = ktime_get();
3707                 } while (single_task_running() && ktime_before(cur, stop));
3708
3709                 spin_lock(&vc->lock);
3710                 vc->vcore_state = VCORE_INACTIVE;
3711
3712                 if (!do_sleep) {
3713                         ++vc->runner->stat.halt_successful_poll;
3714                         goto out;
3715                 }
3716         }
3717
3718         prepare_to_swait_exclusive(&vc->wq, &wait, TASK_INTERRUPTIBLE);
3719
3720         if (kvmppc_vcore_check_block(vc)) {
3721                 finish_swait(&vc->wq, &wait);
3722                 do_sleep = 0;
3723                 /* If we polled, count this as a successful poll */
3724                 if (vc->halt_poll_ns)
3725                         ++vc->runner->stat.halt_successful_poll;
3726                 goto out;
3727         }
3728
3729         start_wait = ktime_get();
3730
3731         vc->vcore_state = VCORE_SLEEPING;
3732         trace_kvmppc_vcore_blocked(vc, 0);
3733         spin_unlock(&vc->lock);
3734         schedule();
3735         finish_swait(&vc->wq, &wait);
3736         spin_lock(&vc->lock);
3737         vc->vcore_state = VCORE_INACTIVE;
3738         trace_kvmppc_vcore_blocked(vc, 1);
3739         ++vc->runner->stat.halt_successful_wait;
3740
3741         cur = ktime_get();
3742
3743 out:
3744         block_ns = ktime_to_ns(cur) - ktime_to_ns(start_poll);
3745
3746         /* Attribute wait time */
3747         if (do_sleep) {
3748                 vc->runner->stat.halt_wait_ns +=
3749                         ktime_to_ns(cur) - ktime_to_ns(start_wait);
3750                 /* Attribute failed poll time */
3751                 if (vc->halt_poll_ns)
3752                         vc->runner->stat.halt_poll_fail_ns +=
3753                                 ktime_to_ns(start_wait) -
3754                                 ktime_to_ns(start_poll);
3755         } else {
3756                 /* Attribute successful poll time */
3757                 if (vc->halt_poll_ns)
3758                         vc->runner->stat.halt_poll_success_ns +=
3759                                 ktime_to_ns(cur) -
3760                                 ktime_to_ns(start_poll);
3761         }
3762
3763         /* Adjust poll time */
3764         if (halt_poll_ns) {
3765                 if (block_ns <= vc->halt_poll_ns)
3766                         ;
3767                 /* We slept and blocked for longer than the max halt time */
3768                 else if (vc->halt_poll_ns && block_ns > halt_poll_ns)
3769                         shrink_halt_poll_ns(vc);
3770                 /* We slept and our poll time is too small */
3771                 else if (vc->halt_poll_ns < halt_poll_ns &&
3772                                 block_ns < halt_poll_ns)
3773                         grow_halt_poll_ns(vc);
3774                 if (vc->halt_poll_ns > halt_poll_ns)
3775                         vc->halt_poll_ns = halt_poll_ns;
3776         } else
3777                 vc->halt_poll_ns = 0;
3778
3779         trace_kvmppc_vcore_wakeup(do_sleep, block_ns);
3780 }
3781
3782 /*
3783  * This never fails for a radix guest, as none of the operations it does
3784  * for a radix guest can fail or have a way to report failure.
3785  * kvmhv_run_single_vcpu() relies on this fact.
3786  */
3787 static int kvmhv_setup_mmu(struct kvm_vcpu *vcpu)
3788 {
3789         int r = 0;
3790         struct kvm *kvm = vcpu->kvm;
3791
3792         mutex_lock(&kvm->lock);
3793         if (!kvm->arch.mmu_ready) {
3794                 if (!kvm_is_radix(kvm))
3795                         r = kvmppc_hv_setup_htab_rma(vcpu);
3796                 if (!r) {
3797                         if (cpu_has_feature(CPU_FTR_ARCH_300))
3798                                 kvmppc_setup_partition_table(kvm);
3799                         kvm->arch.mmu_ready = 1;
3800                 }
3801         }
3802         mutex_unlock(&kvm->lock);
3803         return r;
3804 }
3805
3806 static int kvmppc_run_vcpu(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
3807 {
3808         int n_ceded, i, r;
3809         struct kvmppc_vcore *vc;
3810         struct kvm_vcpu *v;
3811
3812         trace_kvmppc_run_vcpu_enter(vcpu);
3813
3814         kvm_run->exit_reason = 0;
3815         vcpu->arch.ret = RESUME_GUEST;
3816         vcpu->arch.trap = 0;
3817         kvmppc_update_vpas(vcpu);
3818
3819         /*
3820          * Synchronize with other threads in this virtual core
3821          */
3822         vc = vcpu->arch.vcore;
3823         spin_lock(&vc->lock);
3824         vcpu->arch.ceded = 0;
3825         vcpu->arch.run_task = current;
3826         vcpu->arch.kvm_run = kvm_run;
3827         vcpu->arch.stolen_logged = vcore_stolen_time(vc, mftb());
3828         vcpu->arch.state = KVMPPC_VCPU_RUNNABLE;
3829         vcpu->arch.busy_preempt = TB_NIL;
3830         WRITE_ONCE(vc->runnable_threads[vcpu->arch.ptid], vcpu);
3831         ++vc->n_runnable;
3832
3833         /*
3834          * This happens the first time this is called for a vcpu.
3835          * If the vcore is already running, we may be able to start
3836          * this thread straight away and have it join in.
3837          */
3838         if (!signal_pending(current)) {
3839                 if ((vc->vcore_state == VCORE_PIGGYBACK ||
3840                      vc->vcore_state == VCORE_RUNNING) &&
3841                            !VCORE_IS_EXITING(vc)) {
3842                         kvmppc_create_dtl_entry(vcpu, vc);
3843                         kvmppc_start_thread(vcpu, vc);
3844                         trace_kvm_guest_enter(vcpu);
3845                 } else if (vc->vcore_state == VCORE_SLEEPING) {
3846                         swake_up_one(&vc->wq);
3847                 }
3848
3849         }
3850
3851         while (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE &&
3852                !signal_pending(current)) {
3853                 /* See if the MMU is ready to go */
3854                 if (!vcpu->kvm->arch.mmu_ready) {
3855                         spin_unlock(&vc->lock);
3856                         r = kvmhv_setup_mmu(vcpu);
3857                         spin_lock(&vc->lock);
3858                         if (r) {
3859                                 kvm_run->exit_reason = KVM_EXIT_FAIL_ENTRY;
3860                                 kvm_run->fail_entry.
3861                                         hardware_entry_failure_reason = 0;
3862                                 vcpu->arch.ret = r;
3863                                 break;
3864                         }
3865                 }
3866
3867                 if (vc->vcore_state == VCORE_PREEMPT && vc->runner == NULL)
3868                         kvmppc_vcore_end_preempt(vc);
3869
3870                 if (vc->vcore_state != VCORE_INACTIVE) {
3871                         kvmppc_wait_for_exec(vc, vcpu, TASK_INTERRUPTIBLE);
3872                         continue;
3873                 }
3874                 for_each_runnable_thread(i, v, vc) {
3875                         kvmppc_core_prepare_to_enter(v);
3876                         if (signal_pending(v->arch.run_task)) {
3877                                 kvmppc_remove_runnable(vc, v);
3878                                 v->stat.signal_exits++;
3879                                 v->arch.kvm_run->exit_reason = KVM_EXIT_INTR;
3880                                 v->arch.ret = -EINTR;
3881                                 wake_up(&v->arch.cpu_run);
3882                         }
3883                 }
3884                 if (!vc->n_runnable || vcpu->arch.state != KVMPPC_VCPU_RUNNABLE)
3885                         break;
3886                 n_ceded = 0;
3887                 for_each_runnable_thread(i, v, vc) {
3888                         if (!kvmppc_vcpu_woken(v))
3889                                 n_ceded += v->arch.ceded;
3890                         else
3891                                 v->arch.ceded = 0;
3892                 }
3893                 vc->runner = vcpu;
3894                 if (n_ceded == vc->n_runnable) {
3895                         kvmppc_vcore_blocked(vc);
3896                 } else if (need_resched()) {
3897                         kvmppc_vcore_preempt(vc);
3898                         /* Let something else run */
3899                         cond_resched_lock(&vc->lock);
3900                         if (vc->vcore_state == VCORE_PREEMPT)
3901                                 kvmppc_vcore_end_preempt(vc);
3902                 } else {
3903                         kvmppc_run_core(vc);
3904                 }
3905                 vc->runner = NULL;
3906         }
3907
3908         while (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE &&
3909                (vc->vcore_state == VCORE_RUNNING ||
3910                 vc->vcore_state == VCORE_EXITING ||
3911                 vc->vcore_state == VCORE_PIGGYBACK))
3912                 kvmppc_wait_for_exec(vc, vcpu, TASK_UNINTERRUPTIBLE);
3913
3914         if (vc->vcore_state == VCORE_PREEMPT && vc->runner == NULL)
3915                 kvmppc_vcore_end_preempt(vc);
3916
3917         if (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE) {
3918                 kvmppc_remove_runnable(vc, vcpu);
3919                 vcpu->stat.signal_exits++;
3920                 kvm_run->exit_reason = KVM_EXIT_INTR;
3921                 vcpu->arch.ret = -EINTR;
3922         }
3923
3924         if (vc->n_runnable && vc->vcore_state == VCORE_INACTIVE) {
3925                 /* Wake up some vcpu to run the core */
3926                 i = -1;
3927                 v = next_runnable_thread(vc, &i);
3928                 wake_up(&v->arch.cpu_run);
3929         }
3930
3931         trace_kvmppc_run_vcpu_exit(vcpu, kvm_run);
3932         spin_unlock(&vc->lock);
3933         return vcpu->arch.ret;
3934 }
3935
3936 int kvmhv_run_single_vcpu(struct kvm_run *kvm_run,
3937                           struct kvm_vcpu *vcpu, u64 time_limit,
3938                           unsigned long lpcr)
3939 {
3940         int trap, r, pcpu;
3941         int srcu_idx;
3942         struct kvmppc_vcore *vc;
3943         struct kvm *kvm = vcpu->kvm;
3944         struct kvm_nested_guest *nested = vcpu->arch.nested;
3945
3946         trace_kvmppc_run_vcpu_enter(vcpu);
3947
3948         kvm_run->exit_reason = 0;
3949         vcpu->arch.ret = RESUME_GUEST;
3950         vcpu->arch.trap = 0;
3951
3952         vc = vcpu->arch.vcore;
3953         vcpu->arch.ceded = 0;
3954         vcpu->arch.run_task = current;
3955         vcpu->arch.kvm_run = kvm_run;
3956         vcpu->arch.stolen_logged = vcore_stolen_time(vc, mftb());
3957         vcpu->arch.state = KVMPPC_VCPU_RUNNABLE;
3958         vcpu->arch.busy_preempt = TB_NIL;
3959         vcpu->arch.last_inst = KVM_INST_FETCH_FAILED;
3960         vc->runnable_threads[0] = vcpu;
3961         vc->n_runnable = 1;
3962         vc->runner = vcpu;
3963
3964         /* See if the MMU is ready to go */
3965         if (!kvm->arch.mmu_ready)
3966                 kvmhv_setup_mmu(vcpu);
3967
3968         if (need_resched())
3969                 cond_resched();
3970
3971         kvmppc_update_vpas(vcpu);
3972
3973         init_vcore_to_run(vc);
3974         vc->preempt_tb = TB_NIL;
3975
3976         preempt_disable();
3977         pcpu = smp_processor_id();
3978         vc->pcpu = pcpu;
3979         kvmppc_prepare_radix_vcpu(vcpu, pcpu);
3980
3981         local_irq_disable();
3982         hard_irq_disable();
3983         if (signal_pending(current))
3984                 goto sigpend;
3985         if (lazy_irq_pending() || need_resched() || !kvm->arch.mmu_ready)
3986                 goto out;
3987
3988         if (!nested) {
3989                 kvmppc_core_prepare_to_enter(vcpu);
3990                 if (vcpu->arch.doorbell_request) {
3991                         vc->dpdes = 1;
3992                         smp_wmb();
3993                         vcpu->arch.doorbell_request = 0;
3994                 }
3995                 if (test_bit(BOOK3S_IRQPRIO_EXTERNAL,
3996                              &vcpu->arch.pending_exceptions))
3997                         lpcr |= LPCR_MER;
3998         } else if (vcpu->arch.pending_exceptions ||
3999                    vcpu->arch.doorbell_request ||
4000                    xive_interrupt_pending(vcpu)) {
4001                 vcpu->arch.ret = RESUME_HOST;
4002                 goto out;
4003         }
4004
4005         kvmppc_clear_host_core(pcpu);
4006
4007         local_paca->kvm_hstate.tid = 0;
4008         local_paca->kvm_hstate.napping = 0;
4009         local_paca->kvm_hstate.kvm_split_mode = NULL;
4010         kvmppc_start_thread(vcpu, vc);
4011         kvmppc_create_dtl_entry(vcpu, vc);
4012         trace_kvm_guest_enter(vcpu);
4013
4014         vc->vcore_state = VCORE_RUNNING;
4015         trace_kvmppc_run_core(vc, 0);
4016
4017         if (cpu_has_feature(CPU_FTR_HVMODE))
4018                 kvmppc_radix_check_need_tlb_flush(kvm, pcpu, nested);
4019
4020         trace_hardirqs_on();
4021         guest_enter_irqoff();
4022
4023         srcu_idx = srcu_read_lock(&kvm->srcu);
4024
4025         this_cpu_disable_ftrace();
4026
4027         trap = kvmhv_p9_guest_entry(vcpu, time_limit, lpcr);
4028         vcpu->arch.trap = trap;
4029
4030         this_cpu_enable_ftrace();
4031
4032         srcu_read_unlock(&kvm->srcu, srcu_idx);
4033
4034         if (cpu_has_feature(CPU_FTR_HVMODE)) {
4035                 mtspr(SPRN_LPID, kvm->arch.host_lpid);
4036                 isync();
4037         }
4038
4039         trace_hardirqs_off();
4040         set_irq_happened(trap);
4041
4042         kvmppc_set_host_core(pcpu);
4043
4044         local_irq_enable();
4045         guest_exit();
4046
4047         cpumask_clear_cpu(pcpu, &kvm->arch.cpu_in_guest);
4048
4049         preempt_enable();
4050
4051         /* cancel pending decrementer exception if DEC is now positive */
4052         if (get_tb() < vcpu->arch.dec_expires && kvmppc_core_pending_dec(vcpu))
4053                 kvmppc_core_dequeue_dec(vcpu);
4054
4055         trace_kvm_guest_exit(vcpu);
4056         r = RESUME_GUEST;
4057         if (trap) {
4058                 if (!nested)
4059                         r = kvmppc_handle_exit_hv(kvm_run, vcpu, current);
4060                 else
4061                         r = kvmppc_handle_nested_exit(vcpu);
4062         }
4063         vcpu->arch.ret = r;
4064
4065         if (is_kvmppc_resume_guest(r) && vcpu->arch.ceded &&
4066             !kvmppc_vcpu_woken(vcpu)) {
4067                 kvmppc_set_timer(vcpu);
4068                 while (vcpu->arch.ceded && !kvmppc_vcpu_woken(vcpu)) {
4069                         if (signal_pending(current)) {
4070                                 vcpu->stat.signal_exits++;
4071                                 kvm_run->exit_reason = KVM_EXIT_INTR;
4072                                 vcpu->arch.ret = -EINTR;
4073                                 break;
4074                         }
4075                         spin_lock(&vc->lock);
4076                         kvmppc_vcore_blocked(vc);
4077                         spin_unlock(&vc->lock);
4078                 }
4079         }
4080         vcpu->arch.ceded = 0;
4081
4082         vc->vcore_state = VCORE_INACTIVE;
4083         trace_kvmppc_run_core(vc, 1);
4084
4085  done:
4086         kvmppc_remove_runnable(vc, vcpu);
4087         trace_kvmppc_run_vcpu_exit(vcpu, kvm_run);
4088
4089         return vcpu->arch.ret;
4090
4091  sigpend:
4092         vcpu->stat.signal_exits++;
4093         kvm_run->exit_reason = KVM_EXIT_INTR;
4094         vcpu->arch.ret = -EINTR;
4095  out:
4096         local_irq_enable();
4097         preempt_enable();
4098         goto done;
4099 }
4100
4101 static int kvmppc_vcpu_run_hv(struct kvm_run *run, struct kvm_vcpu *vcpu)
4102 {
4103         int r;
4104         int srcu_idx;
4105         unsigned long ebb_regs[3] = {}; /* shut up GCC */
4106         unsigned long user_tar = 0;
4107         unsigned int user_vrsave;
4108         struct kvm *kvm;
4109
4110         if (!vcpu->arch.sane) {
4111                 run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
4112                 return -EINVAL;
4113         }
4114
4115         /*
4116          * Don't allow entry with a suspended transaction, because
4117          * the guest entry/exit code will lose it.
4118          * If the guest has TM enabled, save away their TM-related SPRs
4119          * (they will get restored by the TM unavailable interrupt).
4120          */
4121 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
4122         if (cpu_has_feature(CPU_FTR_TM) && current->thread.regs &&
4123             (current->thread.regs->msr & MSR_TM)) {
4124                 if (MSR_TM_ACTIVE(current->thread.regs->msr)) {
4125                         run->exit_reason = KVM_EXIT_FAIL_ENTRY;
4126                         run->fail_entry.hardware_entry_failure_reason = 0;
4127                         return -EINVAL;
4128                 }
4129                 /* Enable TM so we can read the TM SPRs */
4130                 mtmsr(mfmsr() | MSR_TM);
4131                 current->thread.tm_tfhar = mfspr(SPRN_TFHAR);
4132                 current->thread.tm_tfiar = mfspr(SPRN_TFIAR);
4133                 current->thread.tm_texasr = mfspr(SPRN_TEXASR);
4134                 current->thread.regs->msr &= ~MSR_TM;
4135         }
4136 #endif
4137
4138         /*
4139          * Force online to 1 for the sake of old userspace which doesn't
4140          * set it.
4141          */
4142         if (!vcpu->arch.online) {
4143                 atomic_inc(&vcpu->arch.vcore->online_count);
4144                 vcpu->arch.online = 1;
4145         }
4146
4147         kvmppc_core_prepare_to_enter(vcpu);
4148
4149         /* No need to go into the guest when all we'll do is come back out */
4150         if (signal_pending(current)) {
4151                 run->exit_reason = KVM_EXIT_INTR;
4152                 return -EINTR;
4153         }
4154
4155         kvm = vcpu->kvm;
4156         atomic_inc(&kvm->arch.vcpus_running);
4157         /* Order vcpus_running vs. mmu_ready, see kvmppc_alloc_reset_hpt */
4158         smp_mb();
4159
4160         flush_all_to_thread(current);
4161
4162         /* Save userspace EBB and other register values */
4163         if (cpu_has_feature(CPU_FTR_ARCH_207S)) {
4164                 ebb_regs[0] = mfspr(SPRN_EBBHR);
4165                 ebb_regs[1] = mfspr(SPRN_EBBRR);
4166                 ebb_regs[2] = mfspr(SPRN_BESCR);
4167                 user_tar = mfspr(SPRN_TAR);
4168         }
4169         user_vrsave = mfspr(SPRN_VRSAVE);
4170
4171         vcpu->arch.wqp = &vcpu->arch.vcore->wq;
4172         vcpu->arch.pgdir = current->mm->pgd;
4173         vcpu->arch.state = KVMPPC_VCPU_BUSY_IN_HOST;
4174
4175         do {
4176                 /*
4177                  * The early POWER9 chips that can't mix radix and HPT threads
4178                  * on the same core also need the workaround for the problem
4179                  * where the TLB would prefetch entries in the guest exit path
4180                  * for radix guests using the guest PIDR value and LPID 0.
4181                  * The workaround is in the old path (kvmppc_run_vcpu())
4182                  * but not the new path (kvmhv_run_single_vcpu()).
4183                  */
4184                 if (kvm->arch.threads_indep && kvm_is_radix(kvm) &&
4185                     !no_mixing_hpt_and_radix)
4186                         r = kvmhv_run_single_vcpu(run, vcpu, ~(u64)0,
4187                                                   vcpu->arch.vcore->lpcr);
4188                 else
4189                         r = kvmppc_run_vcpu(run, vcpu);
4190
4191                 if (run->exit_reason == KVM_EXIT_PAPR_HCALL &&
4192                     !(vcpu->arch.shregs.msr & MSR_PR)) {
4193                         trace_kvm_hcall_enter(vcpu);
4194                         r = kvmppc_pseries_do_hcall(vcpu);
4195                         trace_kvm_hcall_exit(vcpu, r);
4196                         kvmppc_core_prepare_to_enter(vcpu);
4197                 } else if (r == RESUME_PAGE_FAULT) {
4198                         srcu_idx = srcu_read_lock(&kvm->srcu);
4199                         r = kvmppc_book3s_hv_page_fault(run, vcpu,
4200                                 vcpu->arch.fault_dar, vcpu->arch.fault_dsisr);
4201                         srcu_read_unlock(&kvm->srcu, srcu_idx);
4202                 } else if (r == RESUME_PASSTHROUGH) {
4203                         if (WARN_ON(xive_enabled()))
4204                                 r = H_SUCCESS;
4205                         else
4206                                 r = kvmppc_xics_rm_complete(vcpu, 0);
4207                 }
4208         } while (is_kvmppc_resume_guest(r));
4209
4210         /* Restore userspace EBB and other register values */
4211         if (cpu_has_feature(CPU_FTR_ARCH_207S)) {
4212                 mtspr(SPRN_EBBHR, ebb_regs[0]);
4213                 mtspr(SPRN_EBBRR, ebb_regs[1]);
4214                 mtspr(SPRN_BESCR, ebb_regs[2]);
4215                 mtspr(SPRN_TAR, user_tar);
4216                 mtspr(SPRN_FSCR, current->thread.fscr);
4217         }
4218         mtspr(SPRN_VRSAVE, user_vrsave);
4219
4220         vcpu->arch.state = KVMPPC_VCPU_NOTREADY;
4221         atomic_dec(&kvm->arch.vcpus_running);
4222         return r;
4223 }
4224
4225 static void kvmppc_add_seg_page_size(struct kvm_ppc_one_seg_page_size **sps,
4226                                      int shift, int sllp)
4227 {
4228         (*sps)->page_shift = shift;
4229         (*sps)->slb_enc = sllp;
4230         (*sps)->enc[0].page_shift = shift;
4231         (*sps)->enc[0].pte_enc = kvmppc_pgsize_lp_encoding(shift, shift);
4232         /*
4233          * Add 16MB MPSS support (may get filtered out by userspace)
4234          */
4235         if (shift != 24) {
4236                 int penc = kvmppc_pgsize_lp_encoding(shift, 24);
4237                 if (penc != -1) {
4238                         (*sps)->enc[1].page_shift = 24;
4239                         (*sps)->enc[1].pte_enc = penc;
4240                 }
4241         }
4242         (*sps)++;
4243 }
4244
4245 static int kvm_vm_ioctl_get_smmu_info_hv(struct kvm *kvm,
4246                                          struct kvm_ppc_smmu_info *info)
4247 {
4248         struct kvm_ppc_one_seg_page_size *sps;
4249
4250         /*
4251          * POWER7, POWER8 and POWER9 all support 32 storage keys for data.
4252          * POWER7 doesn't support keys for instruction accesses,
4253          * POWER8 and POWER9 do.
4254          */
4255         info->data_keys = 32;
4256         info->instr_keys = cpu_has_feature(CPU_FTR_ARCH_207S) ? 32 : 0;
4257
4258         /* POWER7, 8 and 9 all have 1T segments and 32-entry SLB */
4259         info->flags = KVM_PPC_PAGE_SIZES_REAL | KVM_PPC_1T_SEGMENTS;
4260         info->slb_size = 32;
4261
4262         /* We only support these sizes for now, and no muti-size segments */
4263         sps = &info->sps[0];
4264         kvmppc_add_seg_page_size(&sps, 12, 0);
4265         kvmppc_add_seg_page_size(&sps, 16, SLB_VSID_L | SLB_VSID_LP_01);
4266         kvmppc_add_seg_page_size(&sps, 24, SLB_VSID_L);
4267
4268         /* If running as a nested hypervisor, we don't support HPT guests */
4269         if (kvmhv_on_pseries())
4270                 info->flags |= KVM_PPC_NO_HASH;
4271
4272         return 0;
4273 }
4274
4275 /*
4276  * Get (and clear) the dirty memory log for a memory slot.
4277  */
4278 static int kvm_vm_ioctl_get_dirty_log_hv(struct kvm *kvm,
4279                                          struct kvm_dirty_log *log)
4280 {
4281         struct kvm_memslots *slots;
4282         struct kvm_memory_slot *memslot;
4283         int i, r;
4284         unsigned long n;
4285         unsigned long *buf, *p;
4286         struct kvm_vcpu *vcpu;
4287
4288         mutex_lock(&kvm->slots_lock);
4289
4290         r = -EINVAL;
4291         if (log->slot >= KVM_USER_MEM_SLOTS)
4292                 goto out;
4293
4294         slots = kvm_memslots(kvm);
4295         memslot = id_to_memslot(slots, log->slot);
4296         r = -ENOENT;
4297         if (!memslot->dirty_bitmap)
4298                 goto out;
4299
4300         /*
4301          * Use second half of bitmap area because both HPT and radix
4302          * accumulate bits in the first half.
4303          */
4304         n = kvm_dirty_bitmap_bytes(memslot);
4305         buf = memslot->dirty_bitmap + n / sizeof(long);
4306         memset(buf, 0, n);
4307
4308         if (kvm_is_radix(kvm))
4309                 r = kvmppc_hv_get_dirty_log_radix(kvm, memslot, buf);
4310         else
4311                 r = kvmppc_hv_get_dirty_log_hpt(kvm, memslot, buf);
4312         if (r)
4313                 goto out;
4314
4315         /*
4316          * We accumulate dirty bits in the first half of the
4317          * memslot's dirty_bitmap area, for when pages are paged
4318          * out or modified by the host directly.  Pick up these
4319          * bits and add them to the map.
4320          */
4321         p = memslot->dirty_bitmap;
4322         for (i = 0; i < n / sizeof(long); ++i)
4323                 buf[i] |= xchg(&p[i], 0);
4324
4325         /* Harvest dirty bits from VPA and DTL updates */
4326         /* Note: we never modify the SLB shadow buffer areas */
4327         kvm_for_each_vcpu(i, vcpu, kvm) {
4328                 spin_lock(&vcpu->arch.vpa_update_lock);
4329                 kvmppc_harvest_vpa_dirty(&vcpu->arch.vpa, memslot, buf);
4330                 kvmppc_harvest_vpa_dirty(&vcpu->arch.dtl, memslot, buf);
4331                 spin_unlock(&vcpu->arch.vpa_update_lock);
4332         }
4333
4334         r = -EFAULT;
4335         if (copy_to_user(log->dirty_bitmap, buf, n))
4336                 goto out;
4337
4338         r = 0;
4339 out:
4340         mutex_unlock(&kvm->slots_lock);
4341         return r;
4342 }
4343
4344 static void kvmppc_core_free_memslot_hv(struct kvm_memory_slot *free,
4345                                         struct kvm_memory_slot *dont)
4346 {
4347         if (!dont || free->arch.rmap != dont->arch.rmap) {
4348                 vfree(free->arch.rmap);
4349                 free->arch.rmap = NULL;
4350         }
4351 }
4352
4353 static int kvmppc_core_create_memslot_hv(struct kvm_memory_slot *slot,
4354                                          unsigned long npages)
4355 {
4356         slot->arch.rmap = vzalloc(array_size(npages, sizeof(*slot->arch.rmap)));
4357         if (!slot->arch.rmap)
4358                 return -ENOMEM;
4359
4360         return 0;
4361 }
4362
4363 static int kvmppc_core_prepare_memory_region_hv(struct kvm *kvm,
4364                                         struct kvm_memory_slot *memslot,
4365                                         const struct kvm_userspace_memory_region *mem)
4366 {
4367         return 0;
4368 }
4369
4370 static void kvmppc_core_commit_memory_region_hv(struct kvm *kvm,
4371                                 const struct kvm_userspace_memory_region *mem,
4372                                 const struct kvm_memory_slot *old,
4373                                 const struct kvm_memory_slot *new)
4374 {
4375         unsigned long npages = mem->memory_size >> PAGE_SHIFT;
4376
4377         /*
4378          * If we are making a new memslot, it might make
4379          * some address that was previously cached as emulated
4380          * MMIO be no longer emulated MMIO, so invalidate
4381          * all the caches of emulated MMIO translations.
4382          */
4383         if (npages)
4384                 atomic64_inc(&kvm->arch.mmio_update);
4385 }
4386
4387 /*
4388  * Update LPCR values in kvm->arch and in vcores.
4389  * Caller must hold kvm->lock.
4390  */
4391 void kvmppc_update_lpcr(struct kvm *kvm, unsigned long lpcr, unsigned long mask)
4392 {
4393         long int i;
4394         u32 cores_done = 0;
4395
4396         if ((kvm->arch.lpcr & mask) == lpcr)
4397                 return;
4398
4399         kvm->arch.lpcr = (kvm->arch.lpcr & ~mask) | lpcr;
4400
4401         for (i = 0; i < KVM_MAX_VCORES; ++i) {
4402                 struct kvmppc_vcore *vc = kvm->arch.vcores[i];
4403                 if (!vc)
4404                         continue;
4405                 spin_lock(&vc->lock);
4406                 vc->lpcr = (vc->lpcr & ~mask) | lpcr;
4407                 spin_unlock(&vc->lock);
4408                 if (++cores_done >= kvm->arch.online_vcores)
4409                         break;
4410         }
4411 }
4412
4413 static void kvmppc_mmu_destroy_hv(struct kvm_vcpu *vcpu)
4414 {
4415         return;
4416 }
4417
4418 void kvmppc_setup_partition_table(struct kvm *kvm)
4419 {
4420         unsigned long dw0, dw1;
4421
4422         if (!kvm_is_radix(kvm)) {
4423                 /* PS field - page size for VRMA */
4424                 dw0 = ((kvm->arch.vrma_slb_v & SLB_VSID_L) >> 1) |
4425                         ((kvm->arch.vrma_slb_v & SLB_VSID_LP) << 1);
4426                 /* HTABSIZE and HTABORG fields */
4427                 dw0 |= kvm->arch.sdr1;
4428
4429                 /* Second dword as set by userspace */
4430                 dw1 = kvm->arch.process_table;
4431         } else {
4432                 dw0 = PATB_HR | radix__get_tree_size() |
4433                         __pa(kvm->arch.pgtable) | RADIX_PGD_INDEX_SIZE;
4434                 dw1 = PATB_GR | kvm->arch.process_table;
4435         }
4436         kvmhv_set_ptbl_entry(kvm->arch.lpid, dw0, dw1);
4437 }
4438
4439 /*
4440  * Set up HPT (hashed page table) and RMA (real-mode area).
4441  * Must be called with kvm->lock held.
4442  */
4443 static int kvmppc_hv_setup_htab_rma(struct kvm_vcpu *vcpu)
4444 {
4445         int err = 0;
4446         struct kvm *kvm = vcpu->kvm;
4447         unsigned long hva;
4448         struct kvm_memory_slot *memslot;
4449         struct vm_area_struct *vma;
4450         unsigned long lpcr = 0, senc;
4451         unsigned long psize, porder;
4452         int srcu_idx;
4453
4454         /* Allocate hashed page table (if not done already) and reset it */
4455         if (!kvm->arch.hpt.virt) {
4456                 int order = KVM_DEFAULT_HPT_ORDER;
4457                 struct kvm_hpt_info info;
4458
4459                 err = kvmppc_allocate_hpt(&info, order);
4460                 /* If we get here, it means userspace didn't specify a
4461                  * size explicitly.  So, try successively smaller
4462                  * sizes if the default failed. */
4463                 while ((err == -ENOMEM) && --order >= PPC_MIN_HPT_ORDER)
4464                         err  = kvmppc_allocate_hpt(&info, order);
4465
4466                 if (err < 0) {
4467                         pr_err("KVM: Couldn't alloc HPT\n");
4468                         goto out;
4469                 }
4470
4471                 kvmppc_set_hpt(kvm, &info);
4472         }
4473
4474         /* Look up the memslot for guest physical address 0 */
4475         srcu_idx = srcu_read_lock(&kvm->srcu);
4476         memslot = gfn_to_memslot(kvm, 0);
4477
4478         /* We must have some memory at 0 by now */
4479         err = -EINVAL;
4480         if (!memslot || (memslot->flags & KVM_MEMSLOT_INVALID))
4481                 goto out_srcu;
4482
4483         /* Look up the VMA for the start of this memory slot */
4484         hva = memslot->userspace_addr;
4485         down_read(&current->mm->mmap_sem);
4486         vma = find_vma(current->mm, hva);
4487         if (!vma || vma->vm_start > hva || (vma->vm_flags & VM_IO))
4488                 goto up_out;
4489
4490         psize = vma_kernel_pagesize(vma);
4491
4492         up_read(&current->mm->mmap_sem);
4493
4494         /* We can handle 4k, 64k or 16M pages in the VRMA */
4495         if (psize >= 0x1000000)
4496                 psize = 0x1000000;
4497         else if (psize >= 0x10000)
4498                 psize = 0x10000;
4499         else
4500                 psize = 0x1000;
4501         porder = __ilog2(psize);
4502
4503         senc = slb_pgsize_encoding(psize);
4504         kvm->arch.vrma_slb_v = senc | SLB_VSID_B_1T |
4505                 (VRMA_VSID << SLB_VSID_SHIFT_1T);
4506         /* Create HPTEs in the hash page table for the VRMA */
4507         kvmppc_map_vrma(vcpu, memslot, porder);
4508
4509         /* Update VRMASD field in the LPCR */
4510         if (!cpu_has_feature(CPU_FTR_ARCH_300)) {
4511                 /* the -4 is to account for senc values starting at 0x10 */
4512                 lpcr = senc << (LPCR_VRMASD_SH - 4);
4513                 kvmppc_update_lpcr(kvm, lpcr, LPCR_VRMASD);
4514         }
4515
4516         /* Order updates to kvm->arch.lpcr etc. vs. mmu_ready */
4517         smp_wmb();
4518         err = 0;
4519  out_srcu:
4520         srcu_read_unlock(&kvm->srcu, srcu_idx);
4521  out:
4522         return err;
4523
4524  up_out:
4525         up_read(&current->mm->mmap_sem);
4526         goto out_srcu;
4527 }
4528
4529 /* Must be called with kvm->lock held and mmu_ready = 0 and no vcpus running */
4530 int kvmppc_switch_mmu_to_hpt(struct kvm *kvm)
4531 {
4532         if (nesting_enabled(kvm))
4533                 kvmhv_release_all_nested(kvm);
4534         kvmppc_free_radix(kvm);
4535         kvmppc_update_lpcr(kvm, LPCR_VPM1,
4536                            LPCR_VPM1 | LPCR_UPRT | LPCR_GTSE | LPCR_HR);
4537         kvmppc_rmap_reset(kvm);
4538         kvm->arch.radix = 0;
4539         kvm->arch.process_table = 0;
4540         return 0;
4541 }
4542
4543 /* Must be called with kvm->lock held and mmu_ready = 0 and no vcpus running */
4544 int kvmppc_switch_mmu_to_radix(struct kvm *kvm)
4545 {
4546         int err;
4547
4548         err = kvmppc_init_vm_radix(kvm);
4549         if (err)
4550                 return err;
4551
4552         kvmppc_free_hpt(&kvm->arch.hpt);
4553         kvmppc_update_lpcr(kvm, LPCR_UPRT | LPCR_GTSE | LPCR_HR,
4554                            LPCR_VPM1 | LPCR_UPRT | LPCR_GTSE | LPCR_HR);
4555         kvmppc_rmap_reset(kvm);
4556         kvm->arch.radix = 1;
4557         return 0;
4558 }
4559
4560 #ifdef CONFIG_KVM_XICS
4561 /*
4562  * Allocate a per-core structure for managing state about which cores are
4563  * running in the host versus the guest and for exchanging data between
4564  * real mode KVM and CPU running in the host.
4565  * This is only done for the first VM.
4566  * The allocated structure stays even if all VMs have stopped.
4567  * It is only freed when the kvm-hv module is unloaded.
4568  * It's OK for this routine to fail, we just don't support host
4569  * core operations like redirecting H_IPI wakeups.
4570  */
4571 void kvmppc_alloc_host_rm_ops(void)
4572 {
4573         struct kvmppc_host_rm_ops *ops;
4574         unsigned long l_ops;
4575         int cpu, core;
4576         int size;
4577
4578         /* Not the first time here ? */
4579         if (kvmppc_host_rm_ops_hv != NULL)
4580                 return;
4581
4582         ops = kzalloc(sizeof(struct kvmppc_host_rm_ops), GFP_KERNEL);
4583         if (!ops)
4584                 return;
4585
4586         size = cpu_nr_cores() * sizeof(struct kvmppc_host_rm_core);
4587         ops->rm_core = kzalloc(size, GFP_KERNEL);
4588
4589         if (!ops->rm_core) {
4590                 kfree(ops);
4591                 return;
4592         }
4593
4594         cpus_read_lock();
4595
4596         for (cpu = 0; cpu < nr_cpu_ids; cpu += threads_per_core) {
4597                 if (!cpu_online(cpu))
4598                         continue;
4599
4600                 core = cpu >> threads_shift;
4601                 ops->rm_core[core].rm_state.in_host = 1;
4602         }
4603
4604         ops->vcpu_kick = kvmppc_fast_vcpu_kick_hv;
4605
4606         /*
4607          * Make the contents of the kvmppc_host_rm_ops structure visible
4608          * to other CPUs before we assign it to the global variable.
4609          * Do an atomic assignment (no locks used here), but if someone
4610          * beats us to it, just free our copy and return.
4611          */
4612         smp_wmb();
4613         l_ops = (unsigned long) ops;
4614
4615         if (cmpxchg64((unsigned long *)&kvmppc_host_rm_ops_hv, 0, l_ops)) {
4616                 cpus_read_unlock();
4617                 kfree(ops->rm_core);
4618                 kfree(ops);
4619                 return;
4620         }
4621
4622         cpuhp_setup_state_nocalls_cpuslocked(CPUHP_KVM_PPC_BOOK3S_PREPARE,
4623                                              "ppc/kvm_book3s:prepare",
4624                                              kvmppc_set_host_core,
4625                                              kvmppc_clear_host_core);
4626         cpus_read_unlock();
4627 }
4628
4629 void kvmppc_free_host_rm_ops(void)
4630 {
4631         if (kvmppc_host_rm_ops_hv) {
4632                 cpuhp_remove_state_nocalls(CPUHP_KVM_PPC_BOOK3S_PREPARE);
4633                 kfree(kvmppc_host_rm_ops_hv->rm_core);
4634                 kfree(kvmppc_host_rm_ops_hv);
4635                 kvmppc_host_rm_ops_hv = NULL;
4636         }
4637 }
4638 #endif
4639
4640 static int kvmppc_core_init_vm_hv(struct kvm *kvm)
4641 {
4642         unsigned long lpcr, lpid;
4643         char buf[32];
4644         int ret;
4645
4646         /* Allocate the guest's logical partition ID */
4647
4648         lpid = kvmppc_alloc_lpid();
4649         if ((long)lpid < 0)
4650                 return -ENOMEM;
4651         kvm->arch.lpid = lpid;
4652
4653         kvmppc_alloc_host_rm_ops();
4654
4655         kvmhv_vm_nested_init(kvm);
4656
4657         /*
4658          * Since we don't flush the TLB when tearing down a VM,
4659          * and this lpid might have previously been used,
4660          * make sure we flush on each core before running the new VM.
4661          * On POWER9, the tlbie in mmu_partition_table_set_entry()
4662          * does this flush for us.
4663          */
4664         if (!cpu_has_feature(CPU_FTR_ARCH_300))
4665                 cpumask_setall(&kvm->arch.need_tlb_flush);
4666
4667         /* Start out with the default set of hcalls enabled */
4668         memcpy(kvm->arch.enabled_hcalls, default_enabled_hcalls,
4669                sizeof(kvm->arch.enabled_hcalls));
4670
4671         if (!cpu_has_feature(CPU_FTR_ARCH_300))
4672                 kvm->arch.host_sdr1 = mfspr(SPRN_SDR1);
4673
4674         /* Init LPCR for virtual RMA mode */
4675         if (cpu_has_feature(CPU_FTR_HVMODE)) {
4676                 kvm->arch.host_lpid = mfspr(SPRN_LPID);
4677                 kvm->arch.host_lpcr = lpcr = mfspr(SPRN_LPCR);
4678                 lpcr &= LPCR_PECE | LPCR_LPES;
4679         } else {
4680                 lpcr = 0;
4681         }
4682         lpcr |= (4UL << LPCR_DPFD_SH) | LPCR_HDICE |
4683                 LPCR_VPM0 | LPCR_VPM1;
4684         kvm->arch.vrma_slb_v = SLB_VSID_B_1T |
4685                 (VRMA_VSID << SLB_VSID_SHIFT_1T);
4686         /* On POWER8 turn on online bit to enable PURR/SPURR */
4687         if (cpu_has_feature(CPU_FTR_ARCH_207S))
4688                 lpcr |= LPCR_ONL;
4689         /*
4690          * On POWER9, VPM0 bit is reserved (VPM0=1 behaviour is assumed)
4691          * Set HVICE bit to enable hypervisor virtualization interrupts.
4692          * Set HEIC to prevent OS interrupts to go to hypervisor (should
4693          * be unnecessary but better safe than sorry in case we re-enable
4694          * EE in HV mode with this LPCR still set)
4695          */
4696         if (cpu_has_feature(CPU_FTR_ARCH_300)) {
4697                 lpcr &= ~LPCR_VPM0;
4698                 lpcr |= LPCR_HVICE | LPCR_HEIC;
4699
4700                 /*
4701                  * If xive is enabled, we route 0x500 interrupts directly
4702                  * to the guest.
4703                  */
4704                 if (xive_enabled())
4705                         lpcr |= LPCR_LPES;
4706         }
4707
4708         /*
4709          * If the host uses radix, the guest starts out as radix.
4710          */
4711         if (radix_enabled()) {
4712                 kvm->arch.radix = 1;
4713                 kvm->arch.mmu_ready = 1;
4714                 lpcr &= ~LPCR_VPM1;
4715                 lpcr |= LPCR_UPRT | LPCR_GTSE | LPCR_HR;
4716                 ret = kvmppc_init_vm_radix(kvm);
4717                 if (ret) {
4718                         kvmppc_free_lpid(kvm->arch.lpid);
4719                         return ret;
4720                 }
4721                 kvmppc_setup_partition_table(kvm);
4722         }
4723
4724         kvm->arch.lpcr = lpcr;
4725
4726         /* Initialization for future HPT resizes */
4727         kvm->arch.resize_hpt = NULL;
4728
4729         /*
4730          * Work out how many sets the TLB has, for the use of
4731          * the TLB invalidation loop in book3s_hv_rmhandlers.S.
4732          */
4733         if (radix_enabled())
4734                 kvm->arch.tlb_sets = POWER9_TLB_SETS_RADIX;     /* 128 */
4735         else if (cpu_has_feature(CPU_FTR_ARCH_300))
4736                 kvm->arch.tlb_sets = POWER9_TLB_SETS_HASH;      /* 256 */
4737         else if (cpu_has_feature(CPU_FTR_ARCH_207S))
4738                 kvm->arch.tlb_sets = POWER8_TLB_SETS;           /* 512 */
4739         else
4740                 kvm->arch.tlb_sets = POWER7_TLB_SETS;           /* 128 */
4741
4742         /*
4743          * Track that we now have a HV mode VM active. This blocks secondary
4744          * CPU threads from coming online.
4745          * On POWER9, we only need to do this if the "indep_threads_mode"
4746          * module parameter has been set to N.
4747          */
4748         if (cpu_has_feature(CPU_FTR_ARCH_300)) {
4749                 if (!indep_threads_mode && !cpu_has_feature(CPU_FTR_HVMODE)) {
4750                         pr_warn("KVM: Ignoring indep_threads_mode=N in nested hypervisor\n");
4751                         kvm->arch.threads_indep = true;
4752                 } else {
4753                         kvm->arch.threads_indep = indep_threads_mode;
4754                 }
4755         }
4756         if (!kvm->arch.threads_indep)
4757                 kvm_hv_vm_activated();
4758
4759         /*
4760          * Initialize smt_mode depending on processor.
4761          * POWER8 and earlier have to use "strict" threading, where
4762          * all vCPUs in a vcore have to run on the same (sub)core,
4763          * whereas on POWER9 the threads can each run a different
4764          * guest.
4765          */
4766         if (!cpu_has_feature(CPU_FTR_ARCH_300))
4767                 kvm->arch.smt_mode = threads_per_subcore;
4768         else
4769                 kvm->arch.smt_mode = 1;
4770         kvm->arch.emul_smt_mode = 1;
4771
4772         /*
4773          * Create a debugfs directory for the VM
4774          */
4775         snprintf(buf, sizeof(buf), "vm%d", current->pid);
4776         kvm->arch.debugfs_dir = debugfs_create_dir(buf, kvm_debugfs_dir);
4777         kvmppc_mmu_debugfs_init(kvm);
4778         if (radix_enabled())
4779                 kvmhv_radix_debugfs_init(kvm);
4780
4781         return 0;
4782 }
4783
4784 static void kvmppc_free_vcores(struct kvm *kvm)
4785 {
4786         long int i;
4787
4788         for (i = 0; i < KVM_MAX_VCORES; ++i)
4789                 kfree(kvm->arch.vcores[i]);
4790         kvm->arch.online_vcores = 0;
4791 }
4792
4793 static void kvmppc_core_destroy_vm_hv(struct kvm *kvm)
4794 {
4795         debugfs_remove_recursive(kvm->arch.debugfs_dir);
4796
4797         if (!kvm->arch.threads_indep)
4798                 kvm_hv_vm_deactivated();
4799
4800         kvmppc_free_vcores(kvm);
4801
4802
4803         if (kvm_is_radix(kvm))
4804                 kvmppc_free_radix(kvm);
4805         else
4806                 kvmppc_free_hpt(&kvm->arch.hpt);
4807
4808         /* Perform global invalidation and return lpid to the pool */
4809         if (cpu_has_feature(CPU_FTR_ARCH_300)) {
4810                 if (nesting_enabled(kvm))
4811                         kvmhv_release_all_nested(kvm);
4812                 kvm->arch.process_table = 0;
4813                 kvmhv_set_ptbl_entry(kvm->arch.lpid, 0, 0);
4814         }
4815         kvmppc_free_lpid(kvm->arch.lpid);
4816
4817         kvmppc_free_pimap(kvm);
4818 }
4819
4820 /* We don't need to emulate any privileged instructions or dcbz */
4821 static int kvmppc_core_emulate_op_hv(struct kvm_run *run, struct kvm_vcpu *vcpu,
4822                                      unsigned int inst, int *advance)
4823 {
4824         return EMULATE_FAIL;
4825 }
4826
4827 static int kvmppc_core_emulate_mtspr_hv(struct kvm_vcpu *vcpu, int sprn,
4828                                         ulong spr_val)
4829 {
4830         return EMULATE_FAIL;
4831 }
4832
4833 static int kvmppc_core_emulate_mfspr_hv(struct kvm_vcpu *vcpu, int sprn,
4834                                         ulong *spr_val)
4835 {
4836         return EMULATE_FAIL;
4837 }
4838
4839 static int kvmppc_core_check_processor_compat_hv(void)
4840 {
4841         if (cpu_has_feature(CPU_FTR_HVMODE) &&
4842             cpu_has_feature(CPU_FTR_ARCH_206))
4843                 return 0;
4844
4845         /* POWER9 in radix mode is capable of being a nested hypervisor. */
4846         if (cpu_has_feature(CPU_FTR_ARCH_300) && radix_enabled())
4847                 return 0;
4848
4849         return -EIO;
4850 }
4851
4852 #ifdef CONFIG_KVM_XICS
4853
4854 void kvmppc_free_pimap(struct kvm *kvm)
4855 {
4856         kfree(kvm->arch.pimap);
4857 }
4858
4859 static struct kvmppc_passthru_irqmap *kvmppc_alloc_pimap(void)
4860 {
4861         return kzalloc(sizeof(struct kvmppc_passthru_irqmap), GFP_KERNEL);
4862 }
4863
4864 static int kvmppc_set_passthru_irq(struct kvm *kvm, int host_irq, int guest_gsi)
4865 {
4866         struct irq_desc *desc;
4867         struct kvmppc_irq_map *irq_map;
4868         struct kvmppc_passthru_irqmap *pimap;
4869         struct irq_chip *chip;
4870         int i, rc = 0;
4871
4872         if (!kvm_irq_bypass)
4873                 return 1;
4874
4875         desc = irq_to_desc(host_irq);
4876         if (!desc)
4877                 return -EIO;
4878
4879         mutex_lock(&kvm->lock);
4880
4881         pimap = kvm->arch.pimap;
4882         if (pimap == NULL) {
4883                 /* First call, allocate structure to hold IRQ map */
4884                 pimap = kvmppc_alloc_pimap();
4885                 if (pimap == NULL) {
4886                         mutex_unlock(&kvm->lock);
4887                         return -ENOMEM;
4888                 }
4889                 kvm->arch.pimap = pimap;
4890         }
4891
4892         /*
4893          * For now, we only support interrupts for which the EOI operation
4894          * is an OPAL call followed by a write to XIRR, since that's
4895          * what our real-mode EOI code does, or a XIVE interrupt
4896          */
4897         chip = irq_data_get_irq_chip(&desc->irq_data);
4898         if (!chip || !(is_pnv_opal_msi(chip) || is_xive_irq(chip))) {
4899                 pr_warn("kvmppc_set_passthru_irq_hv: Could not assign IRQ map for (%d,%d)\n",
4900                         host_irq, guest_gsi);
4901                 mutex_unlock(&kvm->lock);
4902                 return -ENOENT;
4903         }
4904
4905         /*
4906          * See if we already have an entry for this guest IRQ number.
4907          * If it's mapped to a hardware IRQ number, that's an error,
4908          * otherwise re-use this entry.
4909          */
4910         for (i = 0; i < pimap->n_mapped; i++) {
4911                 if (guest_gsi == pimap->mapped[i].v_hwirq) {
4912                         if (pimap->mapped[i].r_hwirq) {
4913                                 mutex_unlock(&kvm->lock);
4914                                 return -EINVAL;
4915                         }
4916                         break;
4917                 }
4918         }
4919
4920         if (i == KVMPPC_PIRQ_MAPPED) {
4921                 mutex_unlock(&kvm->lock);
4922                 return -EAGAIN;         /* table is full */
4923         }
4924
4925         irq_map = &pimap->mapped[i];
4926
4927         irq_map->v_hwirq = guest_gsi;
4928         irq_map->desc = desc;
4929
4930         /*
4931          * Order the above two stores before the next to serialize with
4932          * the KVM real mode handler.
4933          */
4934         smp_wmb();
4935         irq_map->r_hwirq = desc->irq_data.hwirq;
4936
4937         if (i == pimap->n_mapped)
4938                 pimap->n_mapped++;
4939
4940         if (xive_enabled())
4941                 rc = kvmppc_xive_set_mapped(kvm, guest_gsi, desc);
4942         else
4943                 kvmppc_xics_set_mapped(kvm, guest_gsi, desc->irq_data.hwirq);
4944         if (rc)
4945                 irq_map->r_hwirq = 0;
4946
4947         mutex_unlock(&kvm->lock);
4948
4949         return 0;
4950 }
4951
4952 static int kvmppc_clr_passthru_irq(struct kvm *kvm, int host_irq, int guest_gsi)
4953 {
4954         struct irq_desc *desc;
4955         struct kvmppc_passthru_irqmap *pimap;
4956         int i, rc = 0;
4957
4958         if (!kvm_irq_bypass)
4959                 return 0;
4960
4961         desc = irq_to_desc(host_irq);
4962         if (!desc)
4963                 return -EIO;
4964
4965         mutex_lock(&kvm->lock);
4966         if (!kvm->arch.pimap)
4967                 goto unlock;
4968
4969         pimap = kvm->arch.pimap;
4970
4971         for (i = 0; i < pimap->n_mapped; i++) {
4972                 if (guest_gsi == pimap->mapped[i].v_hwirq)
4973                         break;
4974         }
4975
4976         if (i == pimap->n_mapped) {
4977                 mutex_unlock(&kvm->lock);
4978                 return -ENODEV;
4979         }
4980
4981         if (xive_enabled())
4982                 rc = kvmppc_xive_clr_mapped(kvm, guest_gsi, pimap->mapped[i].desc);
4983         else
4984                 kvmppc_xics_clr_mapped(kvm, guest_gsi, pimap->mapped[i].r_hwirq);
4985
4986         /* invalidate the entry (what do do on error from the above ?) */
4987         pimap->mapped[i].r_hwirq = 0;
4988
4989         /*
4990          * We don't free this structure even when the count goes to
4991          * zero. The structure is freed when we destroy the VM.
4992          */
4993  unlock:
4994         mutex_unlock(&kvm->lock);
4995         return rc;
4996 }
4997
4998 static int kvmppc_irq_bypass_add_producer_hv(struct irq_bypass_consumer *cons,
4999                                              struct irq_bypass_producer *prod)
5000 {
5001         int ret = 0;
5002         struct kvm_kernel_irqfd *irqfd =
5003                 container_of(cons, struct kvm_kernel_irqfd, consumer);
5004
5005         irqfd->producer = prod;
5006
5007         ret = kvmppc_set_passthru_irq(irqfd->kvm, prod->irq, irqfd->gsi);
5008         if (ret)
5009                 pr_info("kvmppc_set_passthru_irq (irq %d, gsi %d) fails: %d\n",
5010                         prod->irq, irqfd->gsi, ret);
5011
5012         return ret;
5013 }
5014
5015 static void kvmppc_irq_bypass_del_producer_hv(struct irq_bypass_consumer *cons,
5016                                               struct irq_bypass_producer *prod)
5017 {
5018         int ret;
5019         struct kvm_kernel_irqfd *irqfd =
5020                 container_of(cons, struct kvm_kernel_irqfd, consumer);
5021
5022         irqfd->producer = NULL;
5023
5024         /*
5025          * When producer of consumer is unregistered, we change back to
5026          * default external interrupt handling mode - KVM real mode
5027          * will switch back to host.
5028          */
5029         ret = kvmppc_clr_passthru_irq(irqfd->kvm, prod->irq, irqfd->gsi);
5030         if (ret)
5031                 pr_warn("kvmppc_clr_passthru_irq (irq %d, gsi %d) fails: %d\n",
5032                         prod->irq, irqfd->gsi, ret);
5033 }
5034 #endif
5035
5036 static long kvm_arch_vm_ioctl_hv(struct file *filp,
5037                                  unsigned int ioctl, unsigned long arg)
5038 {
5039         struct kvm *kvm __maybe_unused = filp->private_data;
5040         void __user *argp = (void __user *)arg;
5041         long r;
5042
5043         switch (ioctl) {
5044
5045         case KVM_PPC_ALLOCATE_HTAB: {
5046                 u32 htab_order;
5047
5048                 r = -EFAULT;
5049                 if (get_user(htab_order, (u32 __user *)argp))
5050                         break;
5051                 r = kvmppc_alloc_reset_hpt(kvm, htab_order);
5052                 if (r)
5053                         break;
5054                 r = 0;
5055                 break;
5056         }
5057
5058         case KVM_PPC_GET_HTAB_FD: {
5059                 struct kvm_get_htab_fd ghf;
5060
5061                 r = -EFAULT;
5062                 if (copy_from_user(&ghf, argp, sizeof(ghf)))
5063                         break;
5064                 r = kvm_vm_ioctl_get_htab_fd(kvm, &ghf);
5065                 break;
5066         }
5067
5068         case KVM_PPC_RESIZE_HPT_PREPARE: {
5069                 struct kvm_ppc_resize_hpt rhpt;
5070
5071                 r = -EFAULT;
5072                 if (copy_from_user(&rhpt, argp, sizeof(rhpt)))
5073                         break;
5074
5075                 r = kvm_vm_ioctl_resize_hpt_prepare(kvm, &rhpt);
5076                 break;
5077         }
5078
5079         case KVM_PPC_RESIZE_HPT_COMMIT: {
5080                 struct kvm_ppc_resize_hpt rhpt;
5081
5082                 r = -EFAULT;
5083                 if (copy_from_user(&rhpt, argp, sizeof(rhpt)))
5084                         break;
5085
5086                 r = kvm_vm_ioctl_resize_hpt_commit(kvm, &rhpt);
5087                 break;
5088         }
5089
5090         default:
5091                 r = -ENOTTY;
5092         }
5093
5094         return r;
5095 }
5096
5097 /*
5098  * List of hcall numbers to enable by default.
5099  * For compatibility with old userspace, we enable by default
5100  * all hcalls that were implemented before the hcall-enabling
5101  * facility was added.  Note this list should not include H_RTAS.
5102  */
5103 static unsigned int default_hcall_list[] = {
5104         H_REMOVE,
5105         H_ENTER,
5106         H_READ,
5107         H_PROTECT,
5108         H_BULK_REMOVE,
5109         H_GET_TCE,
5110         H_PUT_TCE,
5111         H_SET_DABR,
5112         H_SET_XDABR,
5113         H_CEDE,
5114         H_PROD,
5115         H_CONFER,
5116         H_REGISTER_VPA,
5117 #ifdef CONFIG_KVM_XICS
5118         H_EOI,
5119         H_CPPR,
5120         H_IPI,
5121         H_IPOLL,
5122         H_XIRR,
5123         H_XIRR_X,
5124 #endif
5125         0
5126 };
5127
5128 static void init_default_hcalls(void)
5129 {
5130         int i;
5131         unsigned int hcall;
5132
5133         for (i = 0; default_hcall_list[i]; ++i) {
5134                 hcall = default_hcall_list[i];
5135                 WARN_ON(!kvmppc_hcall_impl_hv(hcall));
5136                 __set_bit(hcall / 4, default_enabled_hcalls);
5137         }
5138 }
5139
5140 static int kvmhv_configure_mmu(struct kvm *kvm, struct kvm_ppc_mmuv3_cfg *cfg)
5141 {
5142         unsigned long lpcr;
5143         int radix;
5144         int err;
5145
5146         /* If not on a POWER9, reject it */
5147         if (!cpu_has_feature(CPU_FTR_ARCH_300))
5148                 return -ENODEV;
5149
5150         /* If any unknown flags set, reject it */
5151         if (cfg->flags & ~(KVM_PPC_MMUV3_RADIX | KVM_PPC_MMUV3_GTSE))
5152                 return -EINVAL;
5153
5154         /* GR (guest radix) bit in process_table field must match */
5155         radix = !!(cfg->flags & KVM_PPC_MMUV3_RADIX);
5156         if (!!(cfg->process_table & PATB_GR) != radix)
5157                 return -EINVAL;
5158
5159         /* Process table size field must be reasonable, i.e. <= 24 */
5160         if ((cfg->process_table & PRTS_MASK) > 24)
5161                 return -EINVAL;
5162
5163         /* We can change a guest to/from radix now, if the host is radix */
5164         if (radix && !radix_enabled())
5165                 return -EINVAL;
5166
5167         /* If we're a nested hypervisor, we currently only support radix */
5168         if (kvmhv_on_pseries() && !radix)
5169                 return -EINVAL;
5170
5171         mutex_lock(&kvm->lock);
5172         if (radix != kvm_is_radix(kvm)) {
5173                 if (kvm->arch.mmu_ready) {
5174                         kvm->arch.mmu_ready = 0;
5175                         /* order mmu_ready vs. vcpus_running */
5176                         smp_mb();
5177                         if (atomic_read(&kvm->arch.vcpus_running)) {
5178                                 kvm->arch.mmu_ready = 1;
5179                                 err = -EBUSY;
5180                                 goto out_unlock;
5181                         }
5182                 }
5183                 if (radix)
5184                         err = kvmppc_switch_mmu_to_radix(kvm);
5185                 else
5186                         err = kvmppc_switch_mmu_to_hpt(kvm);
5187                 if (err)
5188                         goto out_unlock;
5189         }
5190
5191         kvm->arch.process_table = cfg->process_table;
5192         kvmppc_setup_partition_table(kvm);
5193
5194         lpcr = (cfg->flags & KVM_PPC_MMUV3_GTSE) ? LPCR_GTSE : 0;
5195         kvmppc_update_lpcr(kvm, lpcr, LPCR_GTSE);
5196         err = 0;
5197
5198  out_unlock:
5199         mutex_unlock(&kvm->lock);
5200         return err;
5201 }
5202
5203 static int kvmhv_enable_nested(struct kvm *kvm)
5204 {
5205         if (!nested)
5206                 return -EPERM;
5207         if (!cpu_has_feature(CPU_FTR_ARCH_300) || no_mixing_hpt_and_radix)
5208                 return -ENODEV;
5209
5210         /* kvm == NULL means the caller is testing if the capability exists */
5211         if (kvm)
5212                 kvm->arch.nested_enable = true;
5213         return 0;
5214 }
5215
5216 static struct kvmppc_ops kvm_ops_hv = {
5217         .get_sregs = kvm_arch_vcpu_ioctl_get_sregs_hv,
5218         .set_sregs = kvm_arch_vcpu_ioctl_set_sregs_hv,
5219         .get_one_reg = kvmppc_get_one_reg_hv,
5220         .set_one_reg = kvmppc_set_one_reg_hv,
5221         .vcpu_load   = kvmppc_core_vcpu_load_hv,
5222         .vcpu_put    = kvmppc_core_vcpu_put_hv,
5223         .set_msr     = kvmppc_set_msr_hv,
5224         .vcpu_run    = kvmppc_vcpu_run_hv,
5225         .vcpu_create = kvmppc_core_vcpu_create_hv,
5226         .vcpu_free   = kvmppc_core_vcpu_free_hv,
5227         .check_requests = kvmppc_core_check_requests_hv,
5228         .get_dirty_log  = kvm_vm_ioctl_get_dirty_log_hv,
5229         .flush_memslot  = kvmppc_core_flush_memslot_hv,
5230         .prepare_memory_region = kvmppc_core_prepare_memory_region_hv,
5231         .commit_memory_region  = kvmppc_core_commit_memory_region_hv,
5232         .unmap_hva_range = kvm_unmap_hva_range_hv,
5233         .age_hva  = kvm_age_hva_hv,
5234         .test_age_hva = kvm_test_age_hva_hv,
5235         .set_spte_hva = kvm_set_spte_hva_hv,
5236         .mmu_destroy  = kvmppc_mmu_destroy_hv,
5237         .free_memslot = kvmppc_core_free_memslot_hv,
5238         .create_memslot = kvmppc_core_create_memslot_hv,
5239         .init_vm =  kvmppc_core_init_vm_hv,
5240         .destroy_vm = kvmppc_core_destroy_vm_hv,
5241         .get_smmu_info = kvm_vm_ioctl_get_smmu_info_hv,
5242         .emulate_op = kvmppc_core_emulate_op_hv,
5243         .emulate_mtspr = kvmppc_core_emulate_mtspr_hv,
5244         .emulate_mfspr = kvmppc_core_emulate_mfspr_hv,
5245         .fast_vcpu_kick = kvmppc_fast_vcpu_kick_hv,
5246         .arch_vm_ioctl  = kvm_arch_vm_ioctl_hv,
5247         .hcall_implemented = kvmppc_hcall_impl_hv,
5248 #ifdef CONFIG_KVM_XICS
5249         .irq_bypass_add_producer = kvmppc_irq_bypass_add_producer_hv,
5250         .irq_bypass_del_producer = kvmppc_irq_bypass_del_producer_hv,
5251 #endif
5252         .configure_mmu = kvmhv_configure_mmu,
5253         .get_rmmu_info = kvmhv_get_rmmu_info,
5254         .set_smt_mode = kvmhv_set_smt_mode,
5255         .enable_nested = kvmhv_enable_nested,
5256 };
5257
5258 static int kvm_init_subcore_bitmap(void)
5259 {
5260         int i, j;
5261         int nr_cores = cpu_nr_cores();
5262         struct sibling_subcore_state *sibling_subcore_state;
5263
5264         for (i = 0; i < nr_cores; i++) {
5265                 int first_cpu = i * threads_per_core;
5266                 int node = cpu_to_node(first_cpu);
5267
5268                 /* Ignore if it is already allocated. */
5269                 if (paca_ptrs[first_cpu]->sibling_subcore_state)
5270                         continue;
5271
5272                 sibling_subcore_state =
5273                         kmalloc_node(sizeof(struct sibling_subcore_state),
5274                                                         GFP_KERNEL, node);
5275                 if (!sibling_subcore_state)
5276                         return -ENOMEM;
5277
5278                 memset(sibling_subcore_state, 0,
5279                                 sizeof(struct sibling_subcore_state));
5280
5281                 for (j = 0; j < threads_per_core; j++) {
5282                         int cpu = first_cpu + j;
5283
5284                         paca_ptrs[cpu]->sibling_subcore_state =
5285                                                 sibling_subcore_state;
5286                 }
5287         }
5288         return 0;
5289 }
5290
5291 static int kvmppc_radix_possible(void)
5292 {
5293         return cpu_has_feature(CPU_FTR_ARCH_300) && radix_enabled();
5294 }
5295
5296 static int kvmppc_book3s_init_hv(void)
5297 {
5298         int r;
5299         /*
5300          * FIXME!! Do we need to check on all cpus ?
5301          */
5302         r = kvmppc_core_check_processor_compat_hv();
5303         if (r < 0)
5304                 return -ENODEV;
5305
5306         r = kvmhv_nested_init();
5307         if (r)
5308                 return r;
5309
5310         r = kvm_init_subcore_bitmap();
5311         if (r)
5312                 return r;
5313
5314         /*
5315          * We need a way of accessing the XICS interrupt controller,
5316          * either directly, via paca_ptrs[cpu]->kvm_hstate.xics_phys, or
5317          * indirectly, via OPAL.
5318          */
5319 #ifdef CONFIG_SMP
5320         if (!xive_enabled() && !kvmhv_on_pseries() &&
5321             !local_paca->kvm_hstate.xics_phys) {
5322                 struct device_node *np;
5323
5324                 np = of_find_compatible_node(NULL, NULL, "ibm,opal-intc");
5325                 if (!np) {
5326                         pr_err("KVM-HV: Cannot determine method for accessing XICS\n");
5327                         return -ENODEV;
5328                 }
5329                 /* presence of intc confirmed - node can be dropped again */
5330                 of_node_put(np);
5331         }
5332 #endif
5333
5334         kvm_ops_hv.owner = THIS_MODULE;
5335         kvmppc_hv_ops = &kvm_ops_hv;
5336
5337         init_default_hcalls();
5338
5339         init_vcore_lists();
5340
5341         r = kvmppc_mmu_hv_init();
5342         if (r)
5343                 return r;
5344
5345         if (kvmppc_radix_possible())
5346                 r = kvmppc_radix_init();
5347
5348         /*
5349          * POWER9 chips before version 2.02 can't have some threads in
5350          * HPT mode and some in radix mode on the same core.
5351          */
5352         if (cpu_has_feature(CPU_FTR_ARCH_300)) {
5353                 unsigned int pvr = mfspr(SPRN_PVR);
5354                 if ((pvr >> 16) == PVR_POWER9 &&
5355                     (((pvr & 0xe000) == 0 && (pvr & 0xfff) < 0x202) ||
5356                      ((pvr & 0xe000) == 0x2000 && (pvr & 0xfff) < 0x101)))
5357                         no_mixing_hpt_and_radix = true;
5358         }
5359
5360         return r;
5361 }
5362
5363 static void kvmppc_book3s_exit_hv(void)
5364 {
5365         kvmppc_free_host_rm_ops();
5366         if (kvmppc_radix_possible())
5367                 kvmppc_radix_exit();
5368         kvmppc_hv_ops = NULL;
5369         kvmhv_nested_exit();
5370 }
5371
5372 module_init(kvmppc_book3s_init_hv);
5373 module_exit(kvmppc_book3s_exit_hv);
5374 MODULE_LICENSE("GPL");
5375 MODULE_ALIAS_MISCDEV(KVM_MINOR);
5376 MODULE_ALIAS("devname:kvm");