arch/powerpc/kvm/powerpc.c

   1 /*
   2  * This program is free software; you can redistribute it and/or modify
   3  * it under the terms of the GNU General Public License, version 2, as
   4  * published by the Free Software Foundation.
   5  *
   6  * This program is distributed in the hope that it will be useful,
   7  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   8  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   9  * GNU General Public License for more details.
  10  *
  11  * You should have received a copy of the GNU General Public License
  12  * along with this program; if not, write to the Free Software
  13  * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  14  *
  15  * Copyright IBM Corp. 2007
  16  *
  17  * Authors: Hollis Blanchard <hollisb@us.ibm.com>
  18  *          Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com>
  19  */
  20
  21 #include <linux/errno.h>
  22 #include <linux/err.h>
  23 #include <linux/kvm_host.h>
  24 #include <linux/module.h>
  25 #include <linux/vmalloc.h>
  26 #include <linux/fs.h>
  27 #include <asm/cputable.h>
  28 #include <asm/uaccess.h>
  29 #include <asm/kvm_ppc.h>
  30 #include <asm/tlbflush.h>
  31 #include "timing.h"
  32 #include "../mm/mmu_decl.h"
  33
  34 gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn)
  35 {
  36         return gfn;
  37 }
  38
  39 int kvm_cpu_has_interrupt(struct kvm_vcpu *v)
  40 {
  41         return !!(v->arch.pending_exceptions);
  42 }
  43
  44 int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
  45 {
  46         return !(v->arch.msr & MSR_WE);
  47 }
  48
  49
  50 int kvmppc_emulate_mmio(struct kvm_run *run, struct kvm_vcpu *vcpu)
  51 {
  52         enum emulation_result er;
  53         int r;
  54
  55         er = kvmppc_emulate_instruction(run, vcpu);
  56         switch (er) {
  57         case EMULATE_DONE:
  58                 /* Future optimization: only reload non-volatiles if they were
  59                  * actually modified. */
  60                 r = RESUME_GUEST_NV;
  61                 break;
  62         case EMULATE_DO_MMIO:
  63                 run->exit_reason = KVM_EXIT_MMIO;
  64                 /* We must reload nonvolatiles because "update" load/store
  65                  * instructions modify register state. */
  66                 /* Future optimization: only reload non-volatiles if they were
  67                  * actually modified. */
  68                 r = RESUME_HOST_NV;
  69                 break;
  70         case EMULATE_FAIL:
  71                 /* XXX Deliver Program interrupt to guest. */
  72                 printk(KERN_EMERG "%s: emulation failed (%08x)\n", __func__,
  73                        vcpu->arch.last_inst);
  74                 r = RESUME_HOST;
  75                 break;
  76         default:
  77                 BUG();
  78         }
  79
  80         return r;
  81 }
  82
  83 void kvm_arch_hardware_enable(void *garbage)
  84 {
  85 }
  86
  87 void kvm_arch_hardware_disable(void *garbage)
  88 {
  89 }
  90
  91 int kvm_arch_hardware_setup(void)
  92 {
  93         return 0;
  94 }
  95
  96 void kvm_arch_hardware_unsetup(void)
  97 {
  98 }
  99
 100 void kvm_arch_check_processor_compat(void *rtn)
 101 {
 102         *(int *)rtn = kvmppc_core_check_processor_compat();
 103 }
 104
 105 struct kvm *kvm_arch_create_vm(void)
 106 {
 107         struct kvm *kvm;
 108
 109         kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL);
 110         if (!kvm)
 111                 return ERR_PTR(-ENOMEM);
 112
 113         return kvm;
 114 }
 115
 116 static void kvmppc_free_vcpus(struct kvm *kvm)
 117 {
 118         unsigned int i;
 119
 120         for (i = 0; i < KVM_MAX_VCPUS; ++i) {
 121                 if (kvm->vcpus[i]) {
 122                         kvm_arch_vcpu_free(kvm->vcpus[i]);
 123                         kvm->vcpus[i] = NULL;
 124                 }
 125         }
 126 }
 127
 128 void kvm_arch_sync_events(struct kvm *kvm)
 129 {
 130 }
 131
 132 void kvm_arch_destroy_vm(struct kvm *kvm)
 133 {
 134         kvmppc_free_vcpus(kvm);
 135         kvm_free_physmem(kvm);
 136         kfree(kvm);
 137 }
 138
 139 int kvm_dev_ioctl_check_extension(long ext)
 140 {
 141         int r;
 142
 143         switch (ext) {
 144         case KVM_CAP_COALESCED_MMIO:
 145                 r = KVM_COALESCED_MMIO_PAGE_OFFSET;
 146                 break;
 147         default:
 148                 r = 0;
 149                 break;
 150         }
 151         return r;
 152
 153 }
 154
 155 long kvm_arch_dev_ioctl(struct file *filp,
 156                         unsigned int ioctl, unsigned long arg)
 157 {
 158         return -EINVAL;
 159 }
 160
 161 int kvm_arch_set_memory_region(struct kvm *kvm,
 162                                struct kvm_userspace_memory_region *mem,
 163                                struct kvm_memory_slot old,
 164                                int user_alloc)
 165 {
 166         return 0;
 167 }
 168
 169 void kvm_arch_flush_shadow(struct kvm *kvm)
 170 {
 171 }
 172
 173 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
 174 {
 175         struct kvm_vcpu *vcpu;
 176         vcpu = kvmppc_core_vcpu_create(kvm, id);
 177         kvmppc_create_vcpu_debugfs(vcpu, id);
 178         return vcpu;
 179 }
 180
 181 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
 182 {
 183         kvmppc_remove_vcpu_debugfs(vcpu);
 184         kvmppc_core_vcpu_free(vcpu);
 185 }
 186
 187 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
 188 {
 189         kvm_arch_vcpu_free(vcpu);
 190 }
 191
 192 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
 193 {
 194         return kvmppc_core_pending_dec(vcpu);
 195 }
 196
 197 static void kvmppc_decrementer_func(unsigned long data)
 198 {
 199         struct kvm_vcpu *vcpu = (struct kvm_vcpu *)data;
 200
 201         kvmppc_core_queue_dec(vcpu);
 202
 203         if (waitqueue_active(&vcpu->wq)) {
 204                 wake_up_interruptible(&vcpu->wq);
 205                 vcpu->stat.halt_wakeup++;
 206         }
 207 }
 208
 209 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
 210 {
 211         setup_timer(&vcpu->arch.dec_timer, kvmppc_decrementer_func,
 212                     (unsigned long)vcpu);
 213
 214         return 0;
 215 }
 216
 217 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
 218 {
 219         kvmppc_core_destroy_mmu(vcpu);
 220 }
 221
 222 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 223 {
 224         if (vcpu->guest_debug.enabled)
 225                 kvmppc_core_load_guest_debugstate(vcpu);
 226
 227         kvmppc_core_vcpu_load(vcpu, cpu);
 228 }
 229
 230 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
 231 {
 232         if (vcpu->guest_debug.enabled)
 233                 kvmppc_core_load_host_debugstate(vcpu);
 234
 235         /* Don't leave guest TLB entries resident when being de-scheduled. */
 236         /* XXX It would be nice to differentiate between heavyweight exit and
 237          * sched_out here, since we could avoid the TLB flush for heavyweight
 238          * exits. */
 239         _tlbil_all();
 240         kvmppc_core_vcpu_put(vcpu);
 241 }
 242
 243 int kvm_arch_vcpu_ioctl_debug_guest(struct kvm_vcpu *vcpu,
 244                                     struct kvm_debug_guest *dbg)
 245 {
 246         int i;
 247
 248         vcpu->guest_debug.enabled = dbg->enabled;
 249         if (vcpu->guest_debug.enabled) {
 250                 for (i=0; i < ARRAY_SIZE(vcpu->guest_debug.bp); i++) {
 251                         if (dbg->breakpoints[i].enabled)
 252                                 vcpu->guest_debug.bp[i] = dbg->breakpoints[i].address;
 253                         else
 254                                 vcpu->guest_debug.bp[i] = 0;
 255                 }
 256         }
 257
 258         return 0;
 259 }
 260
 261 static void kvmppc_complete_dcr_load(struct kvm_vcpu *vcpu,
 262                                      struct kvm_run *run)
 263 {
 264         ulong *gpr = &vcpu->arch.gpr[vcpu->arch.io_gpr];
 265         *gpr = run->dcr.data;
 266 }
 267
 268 static void kvmppc_complete_mmio_load(struct kvm_vcpu *vcpu,
 269                                       struct kvm_run *run)
 270 {
 271         ulong *gpr = &vcpu->arch.gpr[vcpu->arch.io_gpr];
 272
 273         if (run->mmio.len > sizeof(*gpr)) {
 274                 printk(KERN_ERR "bad MMIO length: %d\n", run->mmio.len);
 275                 return;
 276         }
 277
 278         if (vcpu->arch.mmio_is_bigendian) {
 279                 switch (run->mmio.len) {
 280                 case 4: *gpr = *(u32 *)run->mmio.data; break;
 281                 case 2: *gpr = *(u16 *)run->mmio.data; break;
 282                 case 1: *gpr = *(u8 *)run->mmio.data; break;
 283                 }
 284         } else {
 285                 /* Convert BE data from userland back to LE. */
 286                 switch (run->mmio.len) {
 287                 case 4: *gpr = ld_le32((u32 *)run->mmio.data); break;
 288                 case 2: *gpr = ld_le16((u16 *)run->mmio.data); break;
 289                 case 1: *gpr = *(u8 *)run->mmio.data; break;
 290                 }
 291         }
 292 }
 293
 294 int kvmppc_handle_load(struct kvm_run *run, struct kvm_vcpu *vcpu,
 295                        unsigned int rt, unsigned int bytes, int is_bigendian)
 296 {
 297         if (bytes > sizeof(run->mmio.data)) {
 298                 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
 299                        run->mmio.len);
 300         }
 301
 302         run->mmio.phys_addr = vcpu->arch.paddr_accessed;
 303         run->mmio.len = bytes;
 304         run->mmio.is_write = 0;
 305
 306         vcpu->arch.io_gpr = rt;
 307         vcpu->arch.mmio_is_bigendian = is_bigendian;
 308         vcpu->mmio_needed = 1;
 309         vcpu->mmio_is_write = 0;
 310
 311         return EMULATE_DO_MMIO;
 312 }
 313
 314 int kvmppc_handle_store(struct kvm_run *run, struct kvm_vcpu *vcpu,
 315                         u32 val, unsigned int bytes, int is_bigendian)
 316 {
 317         void *data = run->mmio.data;
 318
 319         if (bytes > sizeof(run->mmio.data)) {
 320                 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
 321                        run->mmio.len);
 322         }
 323
 324         run->mmio.phys_addr = vcpu->arch.paddr_accessed;
 325         run->mmio.len = bytes;
 326         run->mmio.is_write = 1;
 327         vcpu->mmio_needed = 1;
 328         vcpu->mmio_is_write = 1;
 329
 330         /* Store the value at the lowest bytes in 'data'. */
 331         if (is_bigendian) {
 332                 switch (bytes) {
 333                 case 4: *(u32 *)data = val; break;
 334                 case 2: *(u16 *)data = val; break;
 335                 case 1: *(u8  *)data = val; break;
 336                 }
 337         } else {
 338                 /* Store LE value into 'data'. */
 339                 switch (bytes) {
 340                 case 4: st_le32(data, val); break;
 341                 case 2: st_le16(data, val); break;
 342                 case 1: *(u8 *)data = val; break;
 343                 }
 344         }
 345
 346         return EMULATE_DO_MMIO;
 347 }
 348
 349 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
 350 {
 351         int r;
 352         sigset_t sigsaved;
 353
 354         vcpu_load(vcpu);
 355
 356         if (vcpu->sigset_active)
 357                 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
 358
 359         if (vcpu->mmio_needed) {
 360                 if (!vcpu->mmio_is_write)
 361                         kvmppc_complete_mmio_load(vcpu, run);
 362                 vcpu->mmio_needed = 0;
 363         } else if (vcpu->arch.dcr_needed) {
 364                 if (!vcpu->arch.dcr_is_write)
 365                         kvmppc_complete_dcr_load(vcpu, run);
 366                 vcpu->arch.dcr_needed = 0;
 367         }
 368
 369         kvmppc_core_deliver_interrupts(vcpu);
 370
 371         local_irq_disable();
 372         kvm_guest_enter();
 373         r = __kvmppc_vcpu_run(run, vcpu);
 374         kvm_guest_exit();
 375         local_irq_enable();
 376
 377         if (vcpu->sigset_active)
 378                 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
 379
 380         vcpu_put(vcpu);
 381
 382         return r;
 383 }
 384
 385 int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq)
 386 {
 387         kvmppc_core_queue_external(vcpu, irq);
 388
 389         if (waitqueue_active(&vcpu->wq)) {
 390                 wake_up_interruptible(&vcpu->wq);
 391                 vcpu->stat.halt_wakeup++;
 392         }
 393
 394         return 0;
 395 }
 396
 397 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
 398                                     struct kvm_mp_state *mp_state)
 399 {
 400         return -EINVAL;
 401 }
 402
 403 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
 404                                     struct kvm_mp_state *mp_state)
 405 {
 406         return -EINVAL;
 407 }
 408
 409 long kvm_arch_vcpu_ioctl(struct file *filp,
 410                          unsigned int ioctl, unsigned long arg)
 411 {
 412         struct kvm_vcpu *vcpu = filp->private_data;
 413         void __user *argp = (void __user *)arg;
 414         long r;
 415
 416         switch (ioctl) {
 417         case KVM_INTERRUPT: {
 418                 struct kvm_interrupt irq;
 419                 r = -EFAULT;
 420                 if (copy_from_user(&irq, argp, sizeof(irq)))
 421                         goto out;
 422                 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
 423                 break;
 424         }
 425         default:
 426                 r = -EINVAL;
 427         }
 428
 429 out:
 430         return r;
 431 }
 432
 433 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
 434 {
 435         return -ENOTSUPP;
 436 }
 437
 438 long kvm_arch_vm_ioctl(struct file *filp,
 439                        unsigned int ioctl, unsigned long arg)
 440 {
 441         long r;
 442
 443         switch (ioctl) {
 444         default:
 445                 r = -EINVAL;
 446         }
 447
 448         return r;
 449 }
 450
 451 int kvm_arch_init(void *opaque)
 452 {
 453         return 0;
 454 }
 455
 456 void kvm_arch_exit(void)
 457 {
 458 }