abcd24fdde3fc9142768452dea3eaf839ec56648
[sfrench/cifs-2.6.git] / arch / s390 / kvm / kvm-s390.c
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * hosting IBM Z kernel virtual machines (s390x)
4  *
5  * Copyright IBM Corp. 2008, 2017
6  *
7  *    Author(s): Carsten Otte <cotte@de.ibm.com>
8  *               Christian Borntraeger <borntraeger@de.ibm.com>
9  *               Heiko Carstens <heiko.carstens@de.ibm.com>
10  *               Christian Ehrhardt <ehrhardt@de.ibm.com>
11  *               Jason J. Herne <jjherne@us.ibm.com>
12  */
13
14 #include <linux/compiler.h>
15 #include <linux/err.h>
16 #include <linux/fs.h>
17 #include <linux/hrtimer.h>
18 #include <linux/init.h>
19 #include <linux/kvm.h>
20 #include <linux/kvm_host.h>
21 #include <linux/mman.h>
22 #include <linux/module.h>
23 #include <linux/moduleparam.h>
24 #include <linux/random.h>
25 #include <linux/slab.h>
26 #include <linux/timer.h>
27 #include <linux/vmalloc.h>
28 #include <linux/bitmap.h>
29 #include <linux/sched/signal.h>
30 #include <linux/string.h>
31
32 #include <asm/asm-offsets.h>
33 #include <asm/lowcore.h>
34 #include <asm/stp.h>
35 #include <asm/pgtable.h>
36 #include <asm/gmap.h>
37 #include <asm/nmi.h>
38 #include <asm/switch_to.h>
39 #include <asm/isc.h>
40 #include <asm/sclp.h>
41 #include <asm/cpacf.h>
42 #include <asm/timex.h>
43 #include "kvm-s390.h"
44 #include "gaccess.h"
45
46 #define KMSG_COMPONENT "kvm-s390"
47 #undef pr_fmt
48 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
49
50 #define CREATE_TRACE_POINTS
51 #include "trace.h"
52 #include "trace-s390.h"
53
54 #define MEM_OP_MAX_SIZE 65536   /* Maximum transfer size for KVM_S390_MEM_OP */
55 #define LOCAL_IRQS 32
56 #define VCPU_IRQS_MAX_BUF (sizeof(struct kvm_s390_irq) * \
57                            (KVM_MAX_VCPUS + LOCAL_IRQS))
58
59 #define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU
60
61 struct kvm_stats_debugfs_item debugfs_entries[] = {
62         { "userspace_handled", VCPU_STAT(exit_userspace) },
63         { "exit_null", VCPU_STAT(exit_null) },
64         { "exit_validity", VCPU_STAT(exit_validity) },
65         { "exit_stop_request", VCPU_STAT(exit_stop_request) },
66         { "exit_external_request", VCPU_STAT(exit_external_request) },
67         { "exit_external_interrupt", VCPU_STAT(exit_external_interrupt) },
68         { "exit_instruction", VCPU_STAT(exit_instruction) },
69         { "exit_pei", VCPU_STAT(exit_pei) },
70         { "exit_program_interruption", VCPU_STAT(exit_program_interruption) },
71         { "exit_instr_and_program_int", VCPU_STAT(exit_instr_and_program) },
72         { "exit_operation_exception", VCPU_STAT(exit_operation_exception) },
73         { "halt_successful_poll", VCPU_STAT(halt_successful_poll) },
74         { "halt_attempted_poll", VCPU_STAT(halt_attempted_poll) },
75         { "halt_poll_invalid", VCPU_STAT(halt_poll_invalid) },
76         { "halt_wakeup", VCPU_STAT(halt_wakeup) },
77         { "instruction_lctlg", VCPU_STAT(instruction_lctlg) },
78         { "instruction_lctl", VCPU_STAT(instruction_lctl) },
79         { "instruction_stctl", VCPU_STAT(instruction_stctl) },
80         { "instruction_stctg", VCPU_STAT(instruction_stctg) },
81         { "deliver_emergency_signal", VCPU_STAT(deliver_emergency_signal) },
82         { "deliver_external_call", VCPU_STAT(deliver_external_call) },
83         { "deliver_service_signal", VCPU_STAT(deliver_service_signal) },
84         { "deliver_virtio_interrupt", VCPU_STAT(deliver_virtio_interrupt) },
85         { "deliver_stop_signal", VCPU_STAT(deliver_stop_signal) },
86         { "deliver_prefix_signal", VCPU_STAT(deliver_prefix_signal) },
87         { "deliver_restart_signal", VCPU_STAT(deliver_restart_signal) },
88         { "deliver_program_interruption", VCPU_STAT(deliver_program_int) },
89         { "exit_wait_state", VCPU_STAT(exit_wait_state) },
90         { "instruction_pfmf", VCPU_STAT(instruction_pfmf) },
91         { "instruction_stidp", VCPU_STAT(instruction_stidp) },
92         { "instruction_spx", VCPU_STAT(instruction_spx) },
93         { "instruction_stpx", VCPU_STAT(instruction_stpx) },
94         { "instruction_stap", VCPU_STAT(instruction_stap) },
95         { "instruction_storage_key", VCPU_STAT(instruction_storage_key) },
96         { "instruction_ipte_interlock", VCPU_STAT(instruction_ipte_interlock) },
97         { "instruction_stsch", VCPU_STAT(instruction_stsch) },
98         { "instruction_chsc", VCPU_STAT(instruction_chsc) },
99         { "instruction_essa", VCPU_STAT(instruction_essa) },
100         { "instruction_stsi", VCPU_STAT(instruction_stsi) },
101         { "instruction_stfl", VCPU_STAT(instruction_stfl) },
102         { "instruction_tprot", VCPU_STAT(instruction_tprot) },
103         { "instruction_sthyi", VCPU_STAT(instruction_sthyi) },
104         { "instruction_sie", VCPU_STAT(instruction_sie) },
105         { "instruction_sigp_sense", VCPU_STAT(instruction_sigp_sense) },
106         { "instruction_sigp_sense_running", VCPU_STAT(instruction_sigp_sense_running) },
107         { "instruction_sigp_external_call", VCPU_STAT(instruction_sigp_external_call) },
108         { "instruction_sigp_emergency", VCPU_STAT(instruction_sigp_emergency) },
109         { "instruction_sigp_cond_emergency", VCPU_STAT(instruction_sigp_cond_emergency) },
110         { "instruction_sigp_start", VCPU_STAT(instruction_sigp_start) },
111         { "instruction_sigp_stop", VCPU_STAT(instruction_sigp_stop) },
112         { "instruction_sigp_stop_store_status", VCPU_STAT(instruction_sigp_stop_store_status) },
113         { "instruction_sigp_store_status", VCPU_STAT(instruction_sigp_store_status) },
114         { "instruction_sigp_store_adtl_status", VCPU_STAT(instruction_sigp_store_adtl_status) },
115         { "instruction_sigp_set_arch", VCPU_STAT(instruction_sigp_arch) },
116         { "instruction_sigp_set_prefix", VCPU_STAT(instruction_sigp_prefix) },
117         { "instruction_sigp_restart", VCPU_STAT(instruction_sigp_restart) },
118         { "instruction_sigp_cpu_reset", VCPU_STAT(instruction_sigp_cpu_reset) },
119         { "instruction_sigp_init_cpu_reset", VCPU_STAT(instruction_sigp_init_cpu_reset) },
120         { "instruction_sigp_unknown", VCPU_STAT(instruction_sigp_unknown) },
121         { "diagnose_10", VCPU_STAT(diagnose_10) },
122         { "diagnose_44", VCPU_STAT(diagnose_44) },
123         { "diagnose_9c", VCPU_STAT(diagnose_9c) },
124         { "diagnose_258", VCPU_STAT(diagnose_258) },
125         { "diagnose_308", VCPU_STAT(diagnose_308) },
126         { "diagnose_500", VCPU_STAT(diagnose_500) },
127         { NULL }
128 };
129
130 struct kvm_s390_tod_clock_ext {
131         __u8 epoch_idx;
132         __u64 tod;
133         __u8 reserved[7];
134 } __packed;
135
136 /* allow nested virtualization in KVM (if enabled by user space) */
137 static int nested;
138 module_param(nested, int, S_IRUGO);
139 MODULE_PARM_DESC(nested, "Nested virtualization support");
140
141 /* upper facilities limit for kvm */
142 unsigned long kvm_s390_fac_list_mask[16] = { FACILITIES_KVM };
143
144 unsigned long kvm_s390_fac_list_mask_size(void)
145 {
146         BUILD_BUG_ON(ARRAY_SIZE(kvm_s390_fac_list_mask) > S390_ARCH_FAC_MASK_SIZE_U64);
147         return ARRAY_SIZE(kvm_s390_fac_list_mask);
148 }
149
150 /* available cpu features supported by kvm */
151 static DECLARE_BITMAP(kvm_s390_available_cpu_feat, KVM_S390_VM_CPU_FEAT_NR_BITS);
152 /* available subfunctions indicated via query / "test bit" */
153 static struct kvm_s390_vm_cpu_subfunc kvm_s390_available_subfunc;
154
155 static struct gmap_notifier gmap_notifier;
156 static struct gmap_notifier vsie_gmap_notifier;
157 debug_info_t *kvm_s390_dbf;
158
159 /* Section: not file related */
160 int kvm_arch_hardware_enable(void)
161 {
162         /* every s390 is virtualization enabled ;-) */
163         return 0;
164 }
165
166 static void kvm_gmap_notifier(struct gmap *gmap, unsigned long start,
167                               unsigned long end);
168
169 /*
170  * This callback is executed during stop_machine(). All CPUs are therefore
171  * temporarily stopped. In order not to change guest behavior, we have to
172  * disable preemption whenever we touch the epoch of kvm and the VCPUs,
173  * so a CPU won't be stopped while calculating with the epoch.
174  */
175 static int kvm_clock_sync(struct notifier_block *notifier, unsigned long val,
176                           void *v)
177 {
178         struct kvm *kvm;
179         struct kvm_vcpu *vcpu;
180         int i;
181         unsigned long long *delta = v;
182
183         list_for_each_entry(kvm, &vm_list, vm_list) {
184                 kvm->arch.epoch -= *delta;
185                 kvm_for_each_vcpu(i, vcpu, kvm) {
186                         vcpu->arch.sie_block->epoch -= *delta;
187                         if (vcpu->arch.cputm_enabled)
188                                 vcpu->arch.cputm_start += *delta;
189                         if (vcpu->arch.vsie_block)
190                                 vcpu->arch.vsie_block->epoch -= *delta;
191                 }
192         }
193         return NOTIFY_OK;
194 }
195
196 static struct notifier_block kvm_clock_notifier = {
197         .notifier_call = kvm_clock_sync,
198 };
199
200 int kvm_arch_hardware_setup(void)
201 {
202         gmap_notifier.notifier_call = kvm_gmap_notifier;
203         gmap_register_pte_notifier(&gmap_notifier);
204         vsie_gmap_notifier.notifier_call = kvm_s390_vsie_gmap_notifier;
205         gmap_register_pte_notifier(&vsie_gmap_notifier);
206         atomic_notifier_chain_register(&s390_epoch_delta_notifier,
207                                        &kvm_clock_notifier);
208         return 0;
209 }
210
211 void kvm_arch_hardware_unsetup(void)
212 {
213         gmap_unregister_pte_notifier(&gmap_notifier);
214         gmap_unregister_pte_notifier(&vsie_gmap_notifier);
215         atomic_notifier_chain_unregister(&s390_epoch_delta_notifier,
216                                          &kvm_clock_notifier);
217 }
218
219 static void allow_cpu_feat(unsigned long nr)
220 {
221         set_bit_inv(nr, kvm_s390_available_cpu_feat);
222 }
223
224 static inline int plo_test_bit(unsigned char nr)
225 {
226         register unsigned long r0 asm("0") = (unsigned long) nr | 0x100;
227         int cc;
228
229         asm volatile(
230                 /* Parameter registers are ignored for "test bit" */
231                 "       plo     0,0,0,0(0)\n"
232                 "       ipm     %0\n"
233                 "       srl     %0,28\n"
234                 : "=d" (cc)
235                 : "d" (r0)
236                 : "cc");
237         return cc == 0;
238 }
239
240 static void kvm_s390_cpu_feat_init(void)
241 {
242         int i;
243
244         for (i = 0; i < 256; ++i) {
245                 if (plo_test_bit(i))
246                         kvm_s390_available_subfunc.plo[i >> 3] |= 0x80 >> (i & 7);
247         }
248
249         if (test_facility(28)) /* TOD-clock steering */
250                 ptff(kvm_s390_available_subfunc.ptff,
251                      sizeof(kvm_s390_available_subfunc.ptff),
252                      PTFF_QAF);
253
254         if (test_facility(17)) { /* MSA */
255                 __cpacf_query(CPACF_KMAC, (cpacf_mask_t *)
256                               kvm_s390_available_subfunc.kmac);
257                 __cpacf_query(CPACF_KMC, (cpacf_mask_t *)
258                               kvm_s390_available_subfunc.kmc);
259                 __cpacf_query(CPACF_KM, (cpacf_mask_t *)
260                               kvm_s390_available_subfunc.km);
261                 __cpacf_query(CPACF_KIMD, (cpacf_mask_t *)
262                               kvm_s390_available_subfunc.kimd);
263                 __cpacf_query(CPACF_KLMD, (cpacf_mask_t *)
264                               kvm_s390_available_subfunc.klmd);
265         }
266         if (test_facility(76)) /* MSA3 */
267                 __cpacf_query(CPACF_PCKMO, (cpacf_mask_t *)
268                               kvm_s390_available_subfunc.pckmo);
269         if (test_facility(77)) { /* MSA4 */
270                 __cpacf_query(CPACF_KMCTR, (cpacf_mask_t *)
271                               kvm_s390_available_subfunc.kmctr);
272                 __cpacf_query(CPACF_KMF, (cpacf_mask_t *)
273                               kvm_s390_available_subfunc.kmf);
274                 __cpacf_query(CPACF_KMO, (cpacf_mask_t *)
275                               kvm_s390_available_subfunc.kmo);
276                 __cpacf_query(CPACF_PCC, (cpacf_mask_t *)
277                               kvm_s390_available_subfunc.pcc);
278         }
279         if (test_facility(57)) /* MSA5 */
280                 __cpacf_query(CPACF_PRNO, (cpacf_mask_t *)
281                               kvm_s390_available_subfunc.ppno);
282
283         if (test_facility(146)) /* MSA8 */
284                 __cpacf_query(CPACF_KMA, (cpacf_mask_t *)
285                               kvm_s390_available_subfunc.kma);
286
287         if (MACHINE_HAS_ESOP)
288                 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_ESOP);
289         /*
290          * We need SIE support, ESOP (PROT_READ protection for gmap_shadow),
291          * 64bit SCAO (SCA passthrough) and IDTE (for gmap_shadow unshadowing).
292          */
293         if (!sclp.has_sief2 || !MACHINE_HAS_ESOP || !sclp.has_64bscao ||
294             !test_facility(3) || !nested)
295                 return;
296         allow_cpu_feat(KVM_S390_VM_CPU_FEAT_SIEF2);
297         if (sclp.has_64bscao)
298                 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_64BSCAO);
299         if (sclp.has_siif)
300                 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_SIIF);
301         if (sclp.has_gpere)
302                 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_GPERE);
303         if (sclp.has_gsls)
304                 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_GSLS);
305         if (sclp.has_ib)
306                 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_IB);
307         if (sclp.has_cei)
308                 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_CEI);
309         if (sclp.has_ibs)
310                 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_IBS);
311         if (sclp.has_kss)
312                 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_KSS);
313         /*
314          * KVM_S390_VM_CPU_FEAT_SKEY: Wrong shadow of PTE.I bits will make
315          * all skey handling functions read/set the skey from the PGSTE
316          * instead of the real storage key.
317          *
318          * KVM_S390_VM_CPU_FEAT_CMMA: Wrong shadow of PTE.I bits will make
319          * pages being detected as preserved although they are resident.
320          *
321          * KVM_S390_VM_CPU_FEAT_PFMFI: Wrong shadow of PTE.I bits will
322          * have the same effect as for KVM_S390_VM_CPU_FEAT_SKEY.
323          *
324          * For KVM_S390_VM_CPU_FEAT_SKEY, KVM_S390_VM_CPU_FEAT_CMMA and
325          * KVM_S390_VM_CPU_FEAT_PFMFI, all PTE.I and PGSTE bits have to be
326          * correctly shadowed. We can do that for the PGSTE but not for PTE.I.
327          *
328          * KVM_S390_VM_CPU_FEAT_SIGPIF: Wrong SCB addresses in the SCA. We
329          * cannot easily shadow the SCA because of the ipte lock.
330          */
331 }
332
333 int kvm_arch_init(void *opaque)
334 {
335         kvm_s390_dbf = debug_register("kvm-trace", 32, 1, 7 * sizeof(long));
336         if (!kvm_s390_dbf)
337                 return -ENOMEM;
338
339         if (debug_register_view(kvm_s390_dbf, &debug_sprintf_view)) {
340                 debug_unregister(kvm_s390_dbf);
341                 return -ENOMEM;
342         }
343
344         kvm_s390_cpu_feat_init();
345
346         /* Register floating interrupt controller interface. */
347         return kvm_register_device_ops(&kvm_flic_ops, KVM_DEV_TYPE_FLIC);
348 }
349
350 void kvm_arch_exit(void)
351 {
352         debug_unregister(kvm_s390_dbf);
353 }
354
355 /* Section: device related */
356 long kvm_arch_dev_ioctl(struct file *filp,
357                         unsigned int ioctl, unsigned long arg)
358 {
359         if (ioctl == KVM_S390_ENABLE_SIE)
360                 return s390_enable_sie();
361         return -EINVAL;
362 }
363
364 int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
365 {
366         int r;
367
368         switch (ext) {
369         case KVM_CAP_S390_PSW:
370         case KVM_CAP_S390_GMAP:
371         case KVM_CAP_SYNC_MMU:
372 #ifdef CONFIG_KVM_S390_UCONTROL
373         case KVM_CAP_S390_UCONTROL:
374 #endif
375         case KVM_CAP_ASYNC_PF:
376         case KVM_CAP_SYNC_REGS:
377         case KVM_CAP_ONE_REG:
378         case KVM_CAP_ENABLE_CAP:
379         case KVM_CAP_S390_CSS_SUPPORT:
380         case KVM_CAP_IOEVENTFD:
381         case KVM_CAP_DEVICE_CTRL:
382         case KVM_CAP_ENABLE_CAP_VM:
383         case KVM_CAP_S390_IRQCHIP:
384         case KVM_CAP_VM_ATTRIBUTES:
385         case KVM_CAP_MP_STATE:
386         case KVM_CAP_IMMEDIATE_EXIT:
387         case KVM_CAP_S390_INJECT_IRQ:
388         case KVM_CAP_S390_USER_SIGP:
389         case KVM_CAP_S390_USER_STSI:
390         case KVM_CAP_S390_SKEYS:
391         case KVM_CAP_S390_IRQ_STATE:
392         case KVM_CAP_S390_USER_INSTR0:
393         case KVM_CAP_S390_CMMA_MIGRATION:
394         case KVM_CAP_S390_AIS:
395         case KVM_CAP_S390_AIS_MIGRATION:
396                 r = 1;
397                 break;
398         case KVM_CAP_S390_MEM_OP:
399                 r = MEM_OP_MAX_SIZE;
400                 break;
401         case KVM_CAP_NR_VCPUS:
402         case KVM_CAP_MAX_VCPUS:
403                 r = KVM_S390_BSCA_CPU_SLOTS;
404                 if (!kvm_s390_use_sca_entries())
405                         r = KVM_MAX_VCPUS;
406                 else if (sclp.has_esca && sclp.has_64bscao)
407                         r = KVM_S390_ESCA_CPU_SLOTS;
408                 break;
409         case KVM_CAP_NR_MEMSLOTS:
410                 r = KVM_USER_MEM_SLOTS;
411                 break;
412         case KVM_CAP_S390_COW:
413                 r = MACHINE_HAS_ESOP;
414                 break;
415         case KVM_CAP_S390_VECTOR_REGISTERS:
416                 r = MACHINE_HAS_VX;
417                 break;
418         case KVM_CAP_S390_RI:
419                 r = test_facility(64);
420                 break;
421         case KVM_CAP_S390_GS:
422                 r = test_facility(133);
423                 break;
424         default:
425                 r = 0;
426         }
427         return r;
428 }
429
430 static void kvm_s390_sync_dirty_log(struct kvm *kvm,
431                                         struct kvm_memory_slot *memslot)
432 {
433         gfn_t cur_gfn, last_gfn;
434         unsigned long address;
435         struct gmap *gmap = kvm->arch.gmap;
436
437         /* Loop over all guest pages */
438         last_gfn = memslot->base_gfn + memslot->npages;
439         for (cur_gfn = memslot->base_gfn; cur_gfn <= last_gfn; cur_gfn++) {
440                 address = gfn_to_hva_memslot(memslot, cur_gfn);
441
442                 if (test_and_clear_guest_dirty(gmap->mm, address))
443                         mark_page_dirty(kvm, cur_gfn);
444                 if (fatal_signal_pending(current))
445                         return;
446                 cond_resched();
447         }
448 }
449
450 /* Section: vm related */
451 static void sca_del_vcpu(struct kvm_vcpu *vcpu);
452
453 /*
454  * Get (and clear) the dirty memory log for a memory slot.
455  */
456 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
457                                struct kvm_dirty_log *log)
458 {
459         int r;
460         unsigned long n;
461         struct kvm_memslots *slots;
462         struct kvm_memory_slot *memslot;
463         int is_dirty = 0;
464
465         if (kvm_is_ucontrol(kvm))
466                 return -EINVAL;
467
468         mutex_lock(&kvm->slots_lock);
469
470         r = -EINVAL;
471         if (log->slot >= KVM_USER_MEM_SLOTS)
472                 goto out;
473
474         slots = kvm_memslots(kvm);
475         memslot = id_to_memslot(slots, log->slot);
476         r = -ENOENT;
477         if (!memslot->dirty_bitmap)
478                 goto out;
479
480         kvm_s390_sync_dirty_log(kvm, memslot);
481         r = kvm_get_dirty_log(kvm, log, &is_dirty);
482         if (r)
483                 goto out;
484
485         /* Clear the dirty log */
486         if (is_dirty) {
487                 n = kvm_dirty_bitmap_bytes(memslot);
488                 memset(memslot->dirty_bitmap, 0, n);
489         }
490         r = 0;
491 out:
492         mutex_unlock(&kvm->slots_lock);
493         return r;
494 }
495
496 static void icpt_operexc_on_all_vcpus(struct kvm *kvm)
497 {
498         unsigned int i;
499         struct kvm_vcpu *vcpu;
500
501         kvm_for_each_vcpu(i, vcpu, kvm) {
502                 kvm_s390_sync_request(KVM_REQ_ICPT_OPEREXC, vcpu);
503         }
504 }
505
506 static int kvm_vm_ioctl_enable_cap(struct kvm *kvm, struct kvm_enable_cap *cap)
507 {
508         int r;
509
510         if (cap->flags)
511                 return -EINVAL;
512
513         switch (cap->cap) {
514         case KVM_CAP_S390_IRQCHIP:
515                 VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_IRQCHIP");
516                 kvm->arch.use_irqchip = 1;
517                 r = 0;
518                 break;
519         case KVM_CAP_S390_USER_SIGP:
520                 VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_USER_SIGP");
521                 kvm->arch.user_sigp = 1;
522                 r = 0;
523                 break;
524         case KVM_CAP_S390_VECTOR_REGISTERS:
525                 mutex_lock(&kvm->lock);
526                 if (kvm->created_vcpus) {
527                         r = -EBUSY;
528                 } else if (MACHINE_HAS_VX) {
529                         set_kvm_facility(kvm->arch.model.fac_mask, 129);
530                         set_kvm_facility(kvm->arch.model.fac_list, 129);
531                         if (test_facility(134)) {
532                                 set_kvm_facility(kvm->arch.model.fac_mask, 134);
533                                 set_kvm_facility(kvm->arch.model.fac_list, 134);
534                         }
535                         if (test_facility(135)) {
536                                 set_kvm_facility(kvm->arch.model.fac_mask, 135);
537                                 set_kvm_facility(kvm->arch.model.fac_list, 135);
538                         }
539                         r = 0;
540                 } else
541                         r = -EINVAL;
542                 mutex_unlock(&kvm->lock);
543                 VM_EVENT(kvm, 3, "ENABLE: CAP_S390_VECTOR_REGISTERS %s",
544                          r ? "(not available)" : "(success)");
545                 break;
546         case KVM_CAP_S390_RI:
547                 r = -EINVAL;
548                 mutex_lock(&kvm->lock);
549                 if (kvm->created_vcpus) {
550                         r = -EBUSY;
551                 } else if (test_facility(64)) {
552                         set_kvm_facility(kvm->arch.model.fac_mask, 64);
553                         set_kvm_facility(kvm->arch.model.fac_list, 64);
554                         r = 0;
555                 }
556                 mutex_unlock(&kvm->lock);
557                 VM_EVENT(kvm, 3, "ENABLE: CAP_S390_RI %s",
558                          r ? "(not available)" : "(success)");
559                 break;
560         case KVM_CAP_S390_AIS:
561                 mutex_lock(&kvm->lock);
562                 if (kvm->created_vcpus) {
563                         r = -EBUSY;
564                 } else {
565                         set_kvm_facility(kvm->arch.model.fac_mask, 72);
566                         set_kvm_facility(kvm->arch.model.fac_list, 72);
567                         r = 0;
568                 }
569                 mutex_unlock(&kvm->lock);
570                 VM_EVENT(kvm, 3, "ENABLE: AIS %s",
571                          r ? "(not available)" : "(success)");
572                 break;
573         case KVM_CAP_S390_GS:
574                 r = -EINVAL;
575                 mutex_lock(&kvm->lock);
576                 if (atomic_read(&kvm->online_vcpus)) {
577                         r = -EBUSY;
578                 } else if (test_facility(133)) {
579                         set_kvm_facility(kvm->arch.model.fac_mask, 133);
580                         set_kvm_facility(kvm->arch.model.fac_list, 133);
581                         r = 0;
582                 }
583                 mutex_unlock(&kvm->lock);
584                 VM_EVENT(kvm, 3, "ENABLE: CAP_S390_GS %s",
585                          r ? "(not available)" : "(success)");
586                 break;
587         case KVM_CAP_S390_USER_STSI:
588                 VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_USER_STSI");
589                 kvm->arch.user_stsi = 1;
590                 r = 0;
591                 break;
592         case KVM_CAP_S390_USER_INSTR0:
593                 VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_USER_INSTR0");
594                 kvm->arch.user_instr0 = 1;
595                 icpt_operexc_on_all_vcpus(kvm);
596                 r = 0;
597                 break;
598         default:
599                 r = -EINVAL;
600                 break;
601         }
602         return r;
603 }
604
605 static int kvm_s390_get_mem_control(struct kvm *kvm, struct kvm_device_attr *attr)
606 {
607         int ret;
608
609         switch (attr->attr) {
610         case KVM_S390_VM_MEM_LIMIT_SIZE:
611                 ret = 0;
612                 VM_EVENT(kvm, 3, "QUERY: max guest memory: %lu bytes",
613                          kvm->arch.mem_limit);
614                 if (put_user(kvm->arch.mem_limit, (u64 __user *)attr->addr))
615                         ret = -EFAULT;
616                 break;
617         default:
618                 ret = -ENXIO;
619                 break;
620         }
621         return ret;
622 }
623
624 static int kvm_s390_set_mem_control(struct kvm *kvm, struct kvm_device_attr *attr)
625 {
626         int ret;
627         unsigned int idx;
628         switch (attr->attr) {
629         case KVM_S390_VM_MEM_ENABLE_CMMA:
630                 ret = -ENXIO;
631                 if (!sclp.has_cmma)
632                         break;
633
634                 ret = -EBUSY;
635                 VM_EVENT(kvm, 3, "%s", "ENABLE: CMMA support");
636                 mutex_lock(&kvm->lock);
637                 if (!kvm->created_vcpus) {
638                         kvm->arch.use_cmma = 1;
639                         ret = 0;
640                 }
641                 mutex_unlock(&kvm->lock);
642                 break;
643         case KVM_S390_VM_MEM_CLR_CMMA:
644                 ret = -ENXIO;
645                 if (!sclp.has_cmma)
646                         break;
647                 ret = -EINVAL;
648                 if (!kvm->arch.use_cmma)
649                         break;
650
651                 VM_EVENT(kvm, 3, "%s", "RESET: CMMA states");
652                 mutex_lock(&kvm->lock);
653                 idx = srcu_read_lock(&kvm->srcu);
654                 s390_reset_cmma(kvm->arch.gmap->mm);
655                 srcu_read_unlock(&kvm->srcu, idx);
656                 mutex_unlock(&kvm->lock);
657                 ret = 0;
658                 break;
659         case KVM_S390_VM_MEM_LIMIT_SIZE: {
660                 unsigned long new_limit;
661
662                 if (kvm_is_ucontrol(kvm))
663                         return -EINVAL;
664
665                 if (get_user(new_limit, (u64 __user *)attr->addr))
666                         return -EFAULT;
667
668                 if (kvm->arch.mem_limit != KVM_S390_NO_MEM_LIMIT &&
669                     new_limit > kvm->arch.mem_limit)
670                         return -E2BIG;
671
672                 if (!new_limit)
673                         return -EINVAL;
674
675                 /* gmap_create takes last usable address */
676                 if (new_limit != KVM_S390_NO_MEM_LIMIT)
677                         new_limit -= 1;
678
679                 ret = -EBUSY;
680                 mutex_lock(&kvm->lock);
681                 if (!kvm->created_vcpus) {
682                         /* gmap_create will round the limit up */
683                         struct gmap *new = gmap_create(current->mm, new_limit);
684
685                         if (!new) {
686                                 ret = -ENOMEM;
687                         } else {
688                                 gmap_remove(kvm->arch.gmap);
689                                 new->private = kvm;
690                                 kvm->arch.gmap = new;
691                                 ret = 0;
692                         }
693                 }
694                 mutex_unlock(&kvm->lock);
695                 VM_EVENT(kvm, 3, "SET: max guest address: %lu", new_limit);
696                 VM_EVENT(kvm, 3, "New guest asce: 0x%pK",
697                          (void *) kvm->arch.gmap->asce);
698                 break;
699         }
700         default:
701                 ret = -ENXIO;
702                 break;
703         }
704         return ret;
705 }
706
707 static void kvm_s390_vcpu_crypto_setup(struct kvm_vcpu *vcpu);
708
709 static int kvm_s390_vm_set_crypto(struct kvm *kvm, struct kvm_device_attr *attr)
710 {
711         struct kvm_vcpu *vcpu;
712         int i;
713
714         if (!test_kvm_facility(kvm, 76))
715                 return -EINVAL;
716
717         mutex_lock(&kvm->lock);
718         switch (attr->attr) {
719         case KVM_S390_VM_CRYPTO_ENABLE_AES_KW:
720                 get_random_bytes(
721                         kvm->arch.crypto.crycb->aes_wrapping_key_mask,
722                         sizeof(kvm->arch.crypto.crycb->aes_wrapping_key_mask));
723                 kvm->arch.crypto.aes_kw = 1;
724                 VM_EVENT(kvm, 3, "%s", "ENABLE: AES keywrapping support");
725                 break;
726         case KVM_S390_VM_CRYPTO_ENABLE_DEA_KW:
727                 get_random_bytes(
728                         kvm->arch.crypto.crycb->dea_wrapping_key_mask,
729                         sizeof(kvm->arch.crypto.crycb->dea_wrapping_key_mask));
730                 kvm->arch.crypto.dea_kw = 1;
731                 VM_EVENT(kvm, 3, "%s", "ENABLE: DEA keywrapping support");
732                 break;
733         case KVM_S390_VM_CRYPTO_DISABLE_AES_KW:
734                 kvm->arch.crypto.aes_kw = 0;
735                 memset(kvm->arch.crypto.crycb->aes_wrapping_key_mask, 0,
736                         sizeof(kvm->arch.crypto.crycb->aes_wrapping_key_mask));
737                 VM_EVENT(kvm, 3, "%s", "DISABLE: AES keywrapping support");
738                 break;
739         case KVM_S390_VM_CRYPTO_DISABLE_DEA_KW:
740                 kvm->arch.crypto.dea_kw = 0;
741                 memset(kvm->arch.crypto.crycb->dea_wrapping_key_mask, 0,
742                         sizeof(kvm->arch.crypto.crycb->dea_wrapping_key_mask));
743                 VM_EVENT(kvm, 3, "%s", "DISABLE: DEA keywrapping support");
744                 break;
745         default:
746                 mutex_unlock(&kvm->lock);
747                 return -ENXIO;
748         }
749
750         kvm_for_each_vcpu(i, vcpu, kvm) {
751                 kvm_s390_vcpu_crypto_setup(vcpu);
752                 exit_sie(vcpu);
753         }
754         mutex_unlock(&kvm->lock);
755         return 0;
756 }
757
758 static void kvm_s390_sync_request_broadcast(struct kvm *kvm, int req)
759 {
760         int cx;
761         struct kvm_vcpu *vcpu;
762
763         kvm_for_each_vcpu(cx, vcpu, kvm)
764                 kvm_s390_sync_request(req, vcpu);
765 }
766
767 /*
768  * Must be called with kvm->srcu held to avoid races on memslots, and with
769  * kvm->lock to avoid races with ourselves and kvm_s390_vm_stop_migration.
770  */
771 static int kvm_s390_vm_start_migration(struct kvm *kvm)
772 {
773         struct kvm_s390_migration_state *mgs;
774         struct kvm_memory_slot *ms;
775         /* should be the only one */
776         struct kvm_memslots *slots;
777         unsigned long ram_pages;
778         int slotnr;
779
780         /* migration mode already enabled */
781         if (kvm->arch.migration_state)
782                 return 0;
783
784         slots = kvm_memslots(kvm);
785         if (!slots || !slots->used_slots)
786                 return -EINVAL;
787
788         mgs = kzalloc(sizeof(*mgs), GFP_KERNEL);
789         if (!mgs)
790                 return -ENOMEM;
791         kvm->arch.migration_state = mgs;
792
793         if (kvm->arch.use_cmma) {
794                 /*
795                  * Get the first slot. They are reverse sorted by base_gfn, so
796                  * the first slot is also the one at the end of the address
797                  * space. We have verified above that at least one slot is
798                  * present.
799                  */
800                 ms = slots->memslots;
801                 /* round up so we only use full longs */
802                 ram_pages = roundup(ms->base_gfn + ms->npages, BITS_PER_LONG);
803                 /* allocate enough bytes to store all the bits */
804                 mgs->pgste_bitmap = vmalloc(ram_pages / 8);
805                 if (!mgs->pgste_bitmap) {
806                         kfree(mgs);
807                         kvm->arch.migration_state = NULL;
808                         return -ENOMEM;
809                 }
810
811                 mgs->bitmap_size = ram_pages;
812                 atomic64_set(&mgs->dirty_pages, ram_pages);
813                 /* mark all the pages in active slots as dirty */
814                 for (slotnr = 0; slotnr < slots->used_slots; slotnr++) {
815                         ms = slots->memslots + slotnr;
816                         bitmap_set(mgs->pgste_bitmap, ms->base_gfn, ms->npages);
817                 }
818
819                 kvm_s390_sync_request_broadcast(kvm, KVM_REQ_START_MIGRATION);
820         }
821         return 0;
822 }
823
824 /*
825  * Must be called with kvm->lock to avoid races with ourselves and
826  * kvm_s390_vm_start_migration.
827  */
828 static int kvm_s390_vm_stop_migration(struct kvm *kvm)
829 {
830         struct kvm_s390_migration_state *mgs;
831
832         /* migration mode already disabled */
833         if (!kvm->arch.migration_state)
834                 return 0;
835         mgs = kvm->arch.migration_state;
836         kvm->arch.migration_state = NULL;
837
838         if (kvm->arch.use_cmma) {
839                 kvm_s390_sync_request_broadcast(kvm, KVM_REQ_STOP_MIGRATION);
840                 vfree(mgs->pgste_bitmap);
841         }
842         kfree(mgs);
843         return 0;
844 }
845
846 static int kvm_s390_vm_set_migration(struct kvm *kvm,
847                                      struct kvm_device_attr *attr)
848 {
849         int idx, res = -ENXIO;
850
851         mutex_lock(&kvm->lock);
852         switch (attr->attr) {
853         case KVM_S390_VM_MIGRATION_START:
854                 idx = srcu_read_lock(&kvm->srcu);
855                 res = kvm_s390_vm_start_migration(kvm);
856                 srcu_read_unlock(&kvm->srcu, idx);
857                 break;
858         case KVM_S390_VM_MIGRATION_STOP:
859                 res = kvm_s390_vm_stop_migration(kvm);
860                 break;
861         default:
862                 break;
863         }
864         mutex_unlock(&kvm->lock);
865
866         return res;
867 }
868
869 static int kvm_s390_vm_get_migration(struct kvm *kvm,
870                                      struct kvm_device_attr *attr)
871 {
872         u64 mig = (kvm->arch.migration_state != NULL);
873
874         if (attr->attr != KVM_S390_VM_MIGRATION_STATUS)
875                 return -ENXIO;
876
877         if (copy_to_user((void __user *)attr->addr, &mig, sizeof(mig)))
878                 return -EFAULT;
879         return 0;
880 }
881
882 static int kvm_s390_set_tod_ext(struct kvm *kvm, struct kvm_device_attr *attr)
883 {
884         struct kvm_s390_vm_tod_clock gtod;
885
886         if (copy_from_user(&gtod, (void __user *)attr->addr, sizeof(gtod)))
887                 return -EFAULT;
888
889         if (test_kvm_facility(kvm, 139))
890                 kvm_s390_set_tod_clock_ext(kvm, &gtod);
891         else if (gtod.epoch_idx == 0)
892                 kvm_s390_set_tod_clock(kvm, gtod.tod);
893         else
894                 return -EINVAL;
895
896         VM_EVENT(kvm, 3, "SET: TOD extension: 0x%x, TOD base: 0x%llx",
897                 gtod.epoch_idx, gtod.tod);
898
899         return 0;
900 }
901
902 static int kvm_s390_set_tod_high(struct kvm *kvm, struct kvm_device_attr *attr)
903 {
904         u8 gtod_high;
905
906         if (copy_from_user(&gtod_high, (void __user *)attr->addr,
907                                            sizeof(gtod_high)))
908                 return -EFAULT;
909
910         if (gtod_high != 0)
911                 return -EINVAL;
912         VM_EVENT(kvm, 3, "SET: TOD extension: 0x%x", gtod_high);
913
914         return 0;
915 }
916
917 static int kvm_s390_set_tod_low(struct kvm *kvm, struct kvm_device_attr *attr)
918 {
919         u64 gtod;
920
921         if (copy_from_user(&gtod, (void __user *)attr->addr, sizeof(gtod)))
922                 return -EFAULT;
923
924         kvm_s390_set_tod_clock(kvm, gtod);
925         VM_EVENT(kvm, 3, "SET: TOD base: 0x%llx", gtod);
926         return 0;
927 }
928
929 static int kvm_s390_set_tod(struct kvm *kvm, struct kvm_device_attr *attr)
930 {
931         int ret;
932
933         if (attr->flags)
934                 return -EINVAL;
935
936         switch (attr->attr) {
937         case KVM_S390_VM_TOD_EXT:
938                 ret = kvm_s390_set_tod_ext(kvm, attr);
939                 break;
940         case KVM_S390_VM_TOD_HIGH:
941                 ret = kvm_s390_set_tod_high(kvm, attr);
942                 break;
943         case KVM_S390_VM_TOD_LOW:
944                 ret = kvm_s390_set_tod_low(kvm, attr);
945                 break;
946         default:
947                 ret = -ENXIO;
948                 break;
949         }
950         return ret;
951 }
952
953 static void kvm_s390_get_tod_clock_ext(struct kvm *kvm,
954                                         struct kvm_s390_vm_tod_clock *gtod)
955 {
956         struct kvm_s390_tod_clock_ext htod;
957
958         preempt_disable();
959
960         get_tod_clock_ext((char *)&htod);
961
962         gtod->tod = htod.tod + kvm->arch.epoch;
963         gtod->epoch_idx = htod.epoch_idx + kvm->arch.epdx;
964
965         if (gtod->tod < htod.tod)
966                 gtod->epoch_idx += 1;
967
968         preempt_enable();
969 }
970
971 static int kvm_s390_get_tod_ext(struct kvm *kvm, struct kvm_device_attr *attr)
972 {
973         struct kvm_s390_vm_tod_clock gtod;
974
975         memset(&gtod, 0, sizeof(gtod));
976
977         if (test_kvm_facility(kvm, 139))
978                 kvm_s390_get_tod_clock_ext(kvm, &gtod);
979         else
980                 gtod.tod = kvm_s390_get_tod_clock_fast(kvm);
981
982         if (copy_to_user((void __user *)attr->addr, &gtod, sizeof(gtod)))
983                 return -EFAULT;
984
985         VM_EVENT(kvm, 3, "QUERY: TOD extension: 0x%x, TOD base: 0x%llx",
986                 gtod.epoch_idx, gtod.tod);
987         return 0;
988 }
989
990 static int kvm_s390_get_tod_high(struct kvm *kvm, struct kvm_device_attr *attr)
991 {
992         u8 gtod_high = 0;
993
994         if (copy_to_user((void __user *)attr->addr, &gtod_high,
995                                          sizeof(gtod_high)))
996                 return -EFAULT;
997         VM_EVENT(kvm, 3, "QUERY: TOD extension: 0x%x", gtod_high);
998
999         return 0;
1000 }
1001
1002 static int kvm_s390_get_tod_low(struct kvm *kvm, struct kvm_device_attr *attr)
1003 {
1004         u64 gtod;
1005
1006         gtod = kvm_s390_get_tod_clock_fast(kvm);
1007         if (copy_to_user((void __user *)attr->addr, &gtod, sizeof(gtod)))
1008                 return -EFAULT;
1009         VM_EVENT(kvm, 3, "QUERY: TOD base: 0x%llx", gtod);
1010
1011         return 0;
1012 }
1013
1014 static int kvm_s390_get_tod(struct kvm *kvm, struct kvm_device_attr *attr)
1015 {
1016         int ret;
1017
1018         if (attr->flags)
1019                 return -EINVAL;
1020
1021         switch (attr->attr) {
1022         case KVM_S390_VM_TOD_EXT:
1023                 ret = kvm_s390_get_tod_ext(kvm, attr);
1024                 break;
1025         case KVM_S390_VM_TOD_HIGH:
1026                 ret = kvm_s390_get_tod_high(kvm, attr);
1027                 break;
1028         case KVM_S390_VM_TOD_LOW:
1029                 ret = kvm_s390_get_tod_low(kvm, attr);
1030                 break;
1031         default:
1032                 ret = -ENXIO;
1033                 break;
1034         }
1035         return ret;
1036 }
1037
1038 static int kvm_s390_set_processor(struct kvm *kvm, struct kvm_device_attr *attr)
1039 {
1040         struct kvm_s390_vm_cpu_processor *proc;
1041         u16 lowest_ibc, unblocked_ibc;
1042         int ret = 0;
1043
1044         mutex_lock(&kvm->lock);
1045         if (kvm->created_vcpus) {
1046                 ret = -EBUSY;
1047                 goto out;
1048         }
1049         proc = kzalloc(sizeof(*proc), GFP_KERNEL);
1050         if (!proc) {
1051                 ret = -ENOMEM;
1052                 goto out;
1053         }
1054         if (!copy_from_user(proc, (void __user *)attr->addr,
1055                             sizeof(*proc))) {
1056                 kvm->arch.model.cpuid = proc->cpuid;
1057                 lowest_ibc = sclp.ibc >> 16 & 0xfff;
1058                 unblocked_ibc = sclp.ibc & 0xfff;
1059                 if (lowest_ibc && proc->ibc) {
1060                         if (proc->ibc > unblocked_ibc)
1061                                 kvm->arch.model.ibc = unblocked_ibc;
1062                         else if (proc->ibc < lowest_ibc)
1063                                 kvm->arch.model.ibc = lowest_ibc;
1064                         else
1065                                 kvm->arch.model.ibc = proc->ibc;
1066                 }
1067                 memcpy(kvm->arch.model.fac_list, proc->fac_list,
1068                        S390_ARCH_FAC_LIST_SIZE_BYTE);
1069                 VM_EVENT(kvm, 3, "SET: guest ibc: 0x%4.4x, guest cpuid: 0x%16.16llx",
1070                          kvm->arch.model.ibc,
1071                          kvm->arch.model.cpuid);
1072                 VM_EVENT(kvm, 3, "SET: guest faclist: 0x%16.16llx.%16.16llx.%16.16llx",
1073                          kvm->arch.model.fac_list[0],
1074                          kvm->arch.model.fac_list[1],
1075                          kvm->arch.model.fac_list[2]);
1076         } else
1077                 ret = -EFAULT;
1078         kfree(proc);
1079 out:
1080         mutex_unlock(&kvm->lock);
1081         return ret;
1082 }
1083
1084 static int kvm_s390_set_processor_feat(struct kvm *kvm,
1085                                        struct kvm_device_attr *attr)
1086 {
1087         struct kvm_s390_vm_cpu_feat data;
1088         int ret = -EBUSY;
1089
1090         if (copy_from_user(&data, (void __user *)attr->addr, sizeof(data)))
1091                 return -EFAULT;
1092         if (!bitmap_subset((unsigned long *) data.feat,
1093                            kvm_s390_available_cpu_feat,
1094                            KVM_S390_VM_CPU_FEAT_NR_BITS))
1095                 return -EINVAL;
1096
1097         mutex_lock(&kvm->lock);
1098         if (!atomic_read(&kvm->online_vcpus)) {
1099                 bitmap_copy(kvm->arch.cpu_feat, (unsigned long *) data.feat,
1100                             KVM_S390_VM_CPU_FEAT_NR_BITS);
1101                 ret = 0;
1102         }
1103         mutex_unlock(&kvm->lock);
1104         return ret;
1105 }
1106
1107 static int kvm_s390_set_processor_subfunc(struct kvm *kvm,
1108                                           struct kvm_device_attr *attr)
1109 {
1110         /*
1111          * Once supported by kernel + hw, we have to store the subfunctions
1112          * in kvm->arch and remember that user space configured them.
1113          */
1114         return -ENXIO;
1115 }
1116
1117 static int kvm_s390_set_cpu_model(struct kvm *kvm, struct kvm_device_attr *attr)
1118 {
1119         int ret = -ENXIO;
1120
1121         switch (attr->attr) {
1122         case KVM_S390_VM_CPU_PROCESSOR:
1123                 ret = kvm_s390_set_processor(kvm, attr);
1124                 break;
1125         case KVM_S390_VM_CPU_PROCESSOR_FEAT:
1126                 ret = kvm_s390_set_processor_feat(kvm, attr);
1127                 break;
1128         case KVM_S390_VM_CPU_PROCESSOR_SUBFUNC:
1129                 ret = kvm_s390_set_processor_subfunc(kvm, attr);
1130                 break;
1131         }
1132         return ret;
1133 }
1134
1135 static int kvm_s390_get_processor(struct kvm *kvm, struct kvm_device_attr *attr)
1136 {
1137         struct kvm_s390_vm_cpu_processor *proc;
1138         int ret = 0;
1139
1140         proc = kzalloc(sizeof(*proc), GFP_KERNEL);
1141         if (!proc) {
1142                 ret = -ENOMEM;
1143                 goto out;
1144         }
1145         proc->cpuid = kvm->arch.model.cpuid;
1146         proc->ibc = kvm->arch.model.ibc;
1147         memcpy(&proc->fac_list, kvm->arch.model.fac_list,
1148                S390_ARCH_FAC_LIST_SIZE_BYTE);
1149         VM_EVENT(kvm, 3, "GET: guest ibc: 0x%4.4x, guest cpuid: 0x%16.16llx",
1150                  kvm->arch.model.ibc,
1151                  kvm->arch.model.cpuid);
1152         VM_EVENT(kvm, 3, "GET: guest faclist: 0x%16.16llx.%16.16llx.%16.16llx",
1153                  kvm->arch.model.fac_list[0],
1154                  kvm->arch.model.fac_list[1],
1155                  kvm->arch.model.fac_list[2]);
1156         if (copy_to_user((void __user *)attr->addr, proc, sizeof(*proc)))
1157                 ret = -EFAULT;
1158         kfree(proc);
1159 out:
1160         return ret;
1161 }
1162
1163 static int kvm_s390_get_machine(struct kvm *kvm, struct kvm_device_attr *attr)
1164 {
1165         struct kvm_s390_vm_cpu_machine *mach;
1166         int ret = 0;
1167
1168         mach = kzalloc(sizeof(*mach), GFP_KERNEL);
1169         if (!mach) {
1170                 ret = -ENOMEM;
1171                 goto out;
1172         }
1173         get_cpu_id((struct cpuid *) &mach->cpuid);
1174         mach->ibc = sclp.ibc;
1175         memcpy(&mach->fac_mask, kvm->arch.model.fac_mask,
1176                S390_ARCH_FAC_LIST_SIZE_BYTE);
1177         memcpy((unsigned long *)&mach->fac_list, S390_lowcore.stfle_fac_list,
1178                sizeof(S390_lowcore.stfle_fac_list));
1179         VM_EVENT(kvm, 3, "GET: host ibc:  0x%4.4x, host cpuid:  0x%16.16llx",
1180                  kvm->arch.model.ibc,
1181                  kvm->arch.model.cpuid);
1182         VM_EVENT(kvm, 3, "GET: host facmask:  0x%16.16llx.%16.16llx.%16.16llx",
1183                  mach->fac_mask[0],
1184                  mach->fac_mask[1],
1185                  mach->fac_mask[2]);
1186         VM_EVENT(kvm, 3, "GET: host faclist:  0x%16.16llx.%16.16llx.%16.16llx",
1187                  mach->fac_list[0],
1188                  mach->fac_list[1],
1189                  mach->fac_list[2]);
1190         if (copy_to_user((void __user *)attr->addr, mach, sizeof(*mach)))
1191                 ret = -EFAULT;
1192         kfree(mach);
1193 out:
1194         return ret;
1195 }
1196
1197 static int kvm_s390_get_processor_feat(struct kvm *kvm,
1198                                        struct kvm_device_attr *attr)
1199 {
1200         struct kvm_s390_vm_cpu_feat data;
1201
1202         bitmap_copy((unsigned long *) data.feat, kvm->arch.cpu_feat,
1203                     KVM_S390_VM_CPU_FEAT_NR_BITS);
1204         if (copy_to_user((void __user *)attr->addr, &data, sizeof(data)))
1205                 return -EFAULT;
1206         return 0;
1207 }
1208
1209 static int kvm_s390_get_machine_feat(struct kvm *kvm,
1210                                      struct kvm_device_attr *attr)
1211 {
1212         struct kvm_s390_vm_cpu_feat data;
1213
1214         bitmap_copy((unsigned long *) data.feat,
1215                     kvm_s390_available_cpu_feat,
1216                     KVM_S390_VM_CPU_FEAT_NR_BITS);
1217         if (copy_to_user((void __user *)attr->addr, &data, sizeof(data)))
1218                 return -EFAULT;
1219         return 0;
1220 }
1221
1222 static int kvm_s390_get_processor_subfunc(struct kvm *kvm,
1223                                           struct kvm_device_attr *attr)
1224 {
1225         /*
1226          * Once we can actually configure subfunctions (kernel + hw support),
1227          * we have to check if they were already set by user space, if so copy
1228          * them from kvm->arch.
1229          */
1230         return -ENXIO;
1231 }
1232
1233 static int kvm_s390_get_machine_subfunc(struct kvm *kvm,
1234                                         struct kvm_device_attr *attr)
1235 {
1236         if (copy_to_user((void __user *)attr->addr, &kvm_s390_available_subfunc,
1237             sizeof(struct kvm_s390_vm_cpu_subfunc)))
1238                 return -EFAULT;
1239         return 0;
1240 }
1241 static int kvm_s390_get_cpu_model(struct kvm *kvm, struct kvm_device_attr *attr)
1242 {
1243         int ret = -ENXIO;
1244
1245         switch (attr->attr) {
1246         case KVM_S390_VM_CPU_PROCESSOR:
1247                 ret = kvm_s390_get_processor(kvm, attr);
1248                 break;
1249         case KVM_S390_VM_CPU_MACHINE:
1250                 ret = kvm_s390_get_machine(kvm, attr);
1251                 break;
1252         case KVM_S390_VM_CPU_PROCESSOR_FEAT:
1253                 ret = kvm_s390_get_processor_feat(kvm, attr);
1254                 break;
1255         case KVM_S390_VM_CPU_MACHINE_FEAT:
1256                 ret = kvm_s390_get_machine_feat(kvm, attr);
1257                 break;
1258         case KVM_S390_VM_CPU_PROCESSOR_SUBFUNC:
1259                 ret = kvm_s390_get_processor_subfunc(kvm, attr);
1260                 break;
1261         case KVM_S390_VM_CPU_MACHINE_SUBFUNC:
1262                 ret = kvm_s390_get_machine_subfunc(kvm, attr);
1263                 break;
1264         }
1265         return ret;
1266 }
1267
1268 static int kvm_s390_vm_set_attr(struct kvm *kvm, struct kvm_device_attr *attr)
1269 {
1270         int ret;
1271
1272         switch (attr->group) {
1273         case KVM_S390_VM_MEM_CTRL:
1274                 ret = kvm_s390_set_mem_control(kvm, attr);
1275                 break;
1276         case KVM_S390_VM_TOD:
1277                 ret = kvm_s390_set_tod(kvm, attr);
1278                 break;
1279         case KVM_S390_VM_CPU_MODEL:
1280                 ret = kvm_s390_set_cpu_model(kvm, attr);
1281                 break;
1282         case KVM_S390_VM_CRYPTO:
1283                 ret = kvm_s390_vm_set_crypto(kvm, attr);
1284                 break;
1285         case KVM_S390_VM_MIGRATION:
1286                 ret = kvm_s390_vm_set_migration(kvm, attr);
1287                 break;
1288         default:
1289                 ret = -ENXIO;
1290                 break;
1291         }
1292
1293         return ret;
1294 }
1295
1296 static int kvm_s390_vm_get_attr(struct kvm *kvm, struct kvm_device_attr *attr)
1297 {
1298         int ret;
1299
1300         switch (attr->group) {
1301         case KVM_S390_VM_MEM_CTRL:
1302                 ret = kvm_s390_get_mem_control(kvm, attr);
1303                 break;
1304         case KVM_S390_VM_TOD:
1305                 ret = kvm_s390_get_tod(kvm, attr);
1306                 break;
1307         case KVM_S390_VM_CPU_MODEL:
1308                 ret = kvm_s390_get_cpu_model(kvm, attr);
1309                 break;
1310         case KVM_S390_VM_MIGRATION:
1311                 ret = kvm_s390_vm_get_migration(kvm, attr);
1312                 break;
1313         default:
1314                 ret = -ENXIO;
1315                 break;
1316         }
1317
1318         return ret;
1319 }
1320
1321 static int kvm_s390_vm_has_attr(struct kvm *kvm, struct kvm_device_attr *attr)
1322 {
1323         int ret;
1324
1325         switch (attr->group) {
1326         case KVM_S390_VM_MEM_CTRL:
1327                 switch (attr->attr) {
1328                 case KVM_S390_VM_MEM_ENABLE_CMMA:
1329                 case KVM_S390_VM_MEM_CLR_CMMA:
1330                         ret = sclp.has_cmma ? 0 : -ENXIO;
1331                         break;
1332                 case KVM_S390_VM_MEM_LIMIT_SIZE:
1333                         ret = 0;
1334                         break;
1335                 default:
1336                         ret = -ENXIO;
1337                         break;
1338                 }
1339                 break;
1340         case KVM_S390_VM_TOD:
1341                 switch (attr->attr) {
1342                 case KVM_S390_VM_TOD_LOW:
1343                 case KVM_S390_VM_TOD_HIGH:
1344                         ret = 0;
1345                         break;
1346                 default:
1347                         ret = -ENXIO;
1348                         break;
1349                 }
1350                 break;
1351         case KVM_S390_VM_CPU_MODEL:
1352                 switch (attr->attr) {
1353                 case KVM_S390_VM_CPU_PROCESSOR:
1354                 case KVM_S390_VM_CPU_MACHINE:
1355                 case KVM_S390_VM_CPU_PROCESSOR_FEAT:
1356                 case KVM_S390_VM_CPU_MACHINE_FEAT:
1357                 case KVM_S390_VM_CPU_MACHINE_SUBFUNC:
1358                         ret = 0;
1359                         break;
1360                 /* configuring subfunctions is not supported yet */
1361                 case KVM_S390_VM_CPU_PROCESSOR_SUBFUNC:
1362                 default:
1363                         ret = -ENXIO;
1364                         break;
1365                 }
1366                 break;
1367         case KVM_S390_VM_CRYPTO:
1368                 switch (attr->attr) {
1369                 case KVM_S390_VM_CRYPTO_ENABLE_AES_KW:
1370                 case KVM_S390_VM_CRYPTO_ENABLE_DEA_KW:
1371                 case KVM_S390_VM_CRYPTO_DISABLE_AES_KW:
1372                 case KVM_S390_VM_CRYPTO_DISABLE_DEA_KW:
1373                         ret = 0;
1374                         break;
1375                 default:
1376                         ret = -ENXIO;
1377                         break;
1378                 }
1379                 break;
1380         case KVM_S390_VM_MIGRATION:
1381                 ret = 0;
1382                 break;
1383         default:
1384                 ret = -ENXIO;
1385                 break;
1386         }
1387
1388         return ret;
1389 }
1390
1391 static long kvm_s390_get_skeys(struct kvm *kvm, struct kvm_s390_skeys *args)
1392 {
1393         uint8_t *keys;
1394         uint64_t hva;
1395         int srcu_idx, i, r = 0;
1396
1397         if (args->flags != 0)
1398                 return -EINVAL;
1399
1400         /* Is this guest using storage keys? */
1401         if (!mm_use_skey(current->mm))
1402                 return KVM_S390_GET_SKEYS_NONE;
1403
1404         /* Enforce sane limit on memory allocation */
1405         if (args->count < 1 || args->count > KVM_S390_SKEYS_MAX)
1406                 return -EINVAL;
1407
1408         keys = kvmalloc_array(args->count, sizeof(uint8_t), GFP_KERNEL);
1409         if (!keys)
1410                 return -ENOMEM;
1411
1412         down_read(&current->mm->mmap_sem);
1413         srcu_idx = srcu_read_lock(&kvm->srcu);
1414         for (i = 0; i < args->count; i++) {
1415                 hva = gfn_to_hva(kvm, args->start_gfn + i);
1416                 if (kvm_is_error_hva(hva)) {
1417                         r = -EFAULT;
1418                         break;
1419                 }
1420
1421                 r = get_guest_storage_key(current->mm, hva, &keys[i]);
1422                 if (r)
1423                         break;
1424         }
1425         srcu_read_unlock(&kvm->srcu, srcu_idx);
1426         up_read(&current->mm->mmap_sem);
1427
1428         if (!r) {
1429                 r = copy_to_user((uint8_t __user *)args->skeydata_addr, keys,
1430                                  sizeof(uint8_t) * args->count);
1431                 if (r)
1432                         r = -EFAULT;
1433         }
1434
1435         kvfree(keys);
1436         return r;
1437 }
1438
1439 static long kvm_s390_set_skeys(struct kvm *kvm, struct kvm_s390_skeys *args)
1440 {
1441         uint8_t *keys;
1442         uint64_t hva;
1443         int srcu_idx, i, r = 0;
1444
1445         if (args->flags != 0)
1446                 return -EINVAL;
1447
1448         /* Enforce sane limit on memory allocation */
1449         if (args->count < 1 || args->count > KVM_S390_SKEYS_MAX)
1450                 return -EINVAL;
1451
1452         keys = kvmalloc_array(args->count, sizeof(uint8_t), GFP_KERNEL);
1453         if (!keys)
1454                 return -ENOMEM;
1455
1456         r = copy_from_user(keys, (uint8_t __user *)args->skeydata_addr,
1457                            sizeof(uint8_t) * args->count);
1458         if (r) {
1459                 r = -EFAULT;
1460                 goto out;
1461         }
1462
1463         /* Enable storage key handling for the guest */
1464         r = s390_enable_skey();
1465         if (r)
1466                 goto out;
1467
1468         down_read(&current->mm->mmap_sem);
1469         srcu_idx = srcu_read_lock(&kvm->srcu);
1470         for (i = 0; i < args->count; i++) {
1471                 hva = gfn_to_hva(kvm, args->start_gfn + i);
1472                 if (kvm_is_error_hva(hva)) {
1473                         r = -EFAULT;
1474                         break;
1475                 }
1476
1477                 /* Lowest order bit is reserved */
1478                 if (keys[i] & 0x01) {
1479                         r = -EINVAL;
1480                         break;
1481                 }
1482
1483                 r = set_guest_storage_key(current->mm, hva, keys[i], 0);
1484                 if (r)
1485                         break;
1486         }
1487         srcu_read_unlock(&kvm->srcu, srcu_idx);
1488         up_read(&current->mm->mmap_sem);
1489 out:
1490         kvfree(keys);
1491         return r;
1492 }
1493
1494 /*
1495  * Base address and length must be sent at the start of each block, therefore
1496  * it's cheaper to send some clean data, as long as it's less than the size of
1497  * two longs.
1498  */
1499 #define KVM_S390_MAX_BIT_DISTANCE (2 * sizeof(void *))
1500 /* for consistency */
1501 #define KVM_S390_CMMA_SIZE_MAX ((u32)KVM_S390_SKEYS_MAX)
1502
1503 /*
1504  * This function searches for the next page with dirty CMMA attributes, and
1505  * saves the attributes in the buffer up to either the end of the buffer or
1506  * until a block of at least KVM_S390_MAX_BIT_DISTANCE clean bits is found;
1507  * no trailing clean bytes are saved.
1508  * In case no dirty bits were found, or if CMMA was not enabled or used, the
1509  * output buffer will indicate 0 as length.
1510  */
1511 static int kvm_s390_get_cmma_bits(struct kvm *kvm,
1512                                   struct kvm_s390_cmma_log *args)
1513 {
1514         struct kvm_s390_migration_state *s = kvm->arch.migration_state;
1515         unsigned long bufsize, hva, pgstev, i, next, cur;
1516         int srcu_idx, peek, r = 0, rr;
1517         u8 *res;
1518
1519         cur = args->start_gfn;
1520         i = next = pgstev = 0;
1521
1522         if (unlikely(!kvm->arch.use_cmma))
1523                 return -ENXIO;
1524         /* Invalid/unsupported flags were specified */
1525         if (args->flags & ~KVM_S390_CMMA_PEEK)
1526                 return -EINVAL;
1527         /* Migration mode query, and we are not doing a migration */
1528         peek = !!(args->flags & KVM_S390_CMMA_PEEK);
1529         if (!peek && !s)
1530                 return -EINVAL;
1531         /* CMMA is disabled or was not used, or the buffer has length zero */
1532         bufsize = min(args->count, KVM_S390_CMMA_SIZE_MAX);
1533         if (!bufsize || !kvm->mm->context.use_cmma) {
1534                 memset(args, 0, sizeof(*args));
1535                 return 0;
1536         }
1537
1538         if (!peek) {
1539                 /* We are not peeking, and there are no dirty pages */
1540                 if (!atomic64_read(&s->dirty_pages)) {
1541                         memset(args, 0, sizeof(*args));
1542                         return 0;
1543                 }
1544                 cur = find_next_bit(s->pgste_bitmap, s->bitmap_size,
1545                                     args->start_gfn);
1546                 if (cur >= s->bitmap_size)      /* nothing found, loop back */
1547                         cur = find_next_bit(s->pgste_bitmap, s->bitmap_size, 0);
1548                 if (cur >= s->bitmap_size) {    /* again! (very unlikely) */
1549                         memset(args, 0, sizeof(*args));
1550                         return 0;
1551                 }
1552                 next = find_next_bit(s->pgste_bitmap, s->bitmap_size, cur + 1);
1553         }
1554
1555         res = vmalloc(bufsize);
1556         if (!res)
1557                 return -ENOMEM;
1558
1559         args->start_gfn = cur;
1560
1561         down_read(&kvm->mm->mmap_sem);
1562         srcu_idx = srcu_read_lock(&kvm->srcu);
1563         while (i < bufsize) {
1564                 hva = gfn_to_hva(kvm, cur);
1565                 if (kvm_is_error_hva(hva)) {
1566                         r = -EFAULT;
1567                         break;
1568                 }
1569                 /* decrement only if we actually flipped the bit to 0 */
1570                 if (!peek && test_and_clear_bit(cur, s->pgste_bitmap))
1571                         atomic64_dec(&s->dirty_pages);
1572                 r = get_pgste(kvm->mm, hva, &pgstev);
1573                 if (r < 0)
1574                         pgstev = 0;
1575                 /* save the value */
1576                 res[i++] = (pgstev >> 24) & 0x43;
1577                 /*
1578                  * if the next bit is too far away, stop.
1579                  * if we reached the previous "next", find the next one
1580                  */
1581                 if (!peek) {
1582                         if (next > cur + KVM_S390_MAX_BIT_DISTANCE)
1583                                 break;
1584                         if (cur == next)
1585                                 next = find_next_bit(s->pgste_bitmap,
1586                                                      s->bitmap_size, cur + 1);
1587                 /* reached the end of the bitmap or of the buffer, stop */
1588                         if ((next >= s->bitmap_size) ||
1589                             (next >= args->start_gfn + bufsize))
1590                                 break;
1591                 }
1592                 cur++;
1593         }
1594         srcu_read_unlock(&kvm->srcu, srcu_idx);
1595         up_read(&kvm->mm->mmap_sem);
1596         args->count = i;
1597         args->remaining = s ? atomic64_read(&s->dirty_pages) : 0;
1598
1599         rr = copy_to_user((void __user *)args->values, res, args->count);
1600         if (rr)
1601                 r = -EFAULT;
1602
1603         vfree(res);
1604         return r;
1605 }
1606
1607 /*
1608  * This function sets the CMMA attributes for the given pages. If the input
1609  * buffer has zero length, no action is taken, otherwise the attributes are
1610  * set and the mm->context.use_cmma flag is set.
1611  */
1612 static int kvm_s390_set_cmma_bits(struct kvm *kvm,
1613                                   const struct kvm_s390_cmma_log *args)
1614 {
1615         unsigned long hva, mask, pgstev, i;
1616         uint8_t *bits;
1617         int srcu_idx, r = 0;
1618
1619         mask = args->mask;
1620
1621         if (!kvm->arch.use_cmma)
1622                 return -ENXIO;
1623         /* invalid/unsupported flags */
1624         if (args->flags != 0)
1625                 return -EINVAL;
1626         /* Enforce sane limit on memory allocation */
1627         if (args->count > KVM_S390_CMMA_SIZE_MAX)
1628                 return -EINVAL;
1629         /* Nothing to do */
1630         if (args->count == 0)
1631                 return 0;
1632
1633         bits = vmalloc(sizeof(*bits) * args->count);
1634         if (!bits)
1635                 return -ENOMEM;
1636
1637         r = copy_from_user(bits, (void __user *)args->values, args->count);
1638         if (r) {
1639                 r = -EFAULT;
1640                 goto out;
1641         }
1642
1643         down_read(&kvm->mm->mmap_sem);
1644         srcu_idx = srcu_read_lock(&kvm->srcu);
1645         for (i = 0; i < args->count; i++) {
1646                 hva = gfn_to_hva(kvm, args->start_gfn + i);
1647                 if (kvm_is_error_hva(hva)) {
1648                         r = -EFAULT;
1649                         break;
1650                 }
1651
1652                 pgstev = bits[i];
1653                 pgstev = pgstev << 24;
1654                 mask &= _PGSTE_GPS_USAGE_MASK | _PGSTE_GPS_NODAT;
1655                 set_pgste_bits(kvm->mm, hva, mask, pgstev);
1656         }
1657         srcu_read_unlock(&kvm->srcu, srcu_idx);
1658         up_read(&kvm->mm->mmap_sem);
1659
1660         if (!kvm->mm->context.use_cmma) {
1661                 down_write(&kvm->mm->mmap_sem);
1662                 kvm->mm->context.use_cmma = 1;
1663                 up_write(&kvm->mm->mmap_sem);
1664         }
1665 out:
1666         vfree(bits);
1667         return r;
1668 }
1669
1670 long kvm_arch_vm_ioctl(struct file *filp,
1671                        unsigned int ioctl, unsigned long arg)
1672 {
1673         struct kvm *kvm = filp->private_data;
1674         void __user *argp = (void __user *)arg;
1675         struct kvm_device_attr attr;
1676         int r;
1677
1678         switch (ioctl) {
1679         case KVM_S390_INTERRUPT: {
1680                 struct kvm_s390_interrupt s390int;
1681
1682                 r = -EFAULT;
1683                 if (copy_from_user(&s390int, argp, sizeof(s390int)))
1684                         break;
1685                 r = kvm_s390_inject_vm(kvm, &s390int);
1686                 break;
1687         }
1688         case KVM_ENABLE_CAP: {
1689                 struct kvm_enable_cap cap;
1690                 r = -EFAULT;
1691                 if (copy_from_user(&cap, argp, sizeof(cap)))
1692                         break;
1693                 r = kvm_vm_ioctl_enable_cap(kvm, &cap);
1694                 break;
1695         }
1696         case KVM_CREATE_IRQCHIP: {
1697                 struct kvm_irq_routing_entry routing;
1698
1699                 r = -EINVAL;
1700                 if (kvm->arch.use_irqchip) {
1701                         /* Set up dummy routing. */
1702                         memset(&routing, 0, sizeof(routing));
1703                         r = kvm_set_irq_routing(kvm, &routing, 0, 0);
1704                 }
1705                 break;
1706         }
1707         case KVM_SET_DEVICE_ATTR: {
1708                 r = -EFAULT;
1709                 if (copy_from_user(&attr, (void __user *)arg, sizeof(attr)))
1710                         break;
1711                 r = kvm_s390_vm_set_attr(kvm, &attr);
1712                 break;
1713         }
1714         case KVM_GET_DEVICE_ATTR: {
1715                 r = -EFAULT;
1716                 if (copy_from_user(&attr, (void __user *)arg, sizeof(attr)))
1717                         break;
1718                 r = kvm_s390_vm_get_attr(kvm, &attr);
1719                 break;
1720         }
1721         case KVM_HAS_DEVICE_ATTR: {
1722                 r = -EFAULT;
1723                 if (copy_from_user(&attr, (void __user *)arg, sizeof(attr)))
1724                         break;
1725                 r = kvm_s390_vm_has_attr(kvm, &attr);
1726                 break;
1727         }
1728         case KVM_S390_GET_SKEYS: {
1729                 struct kvm_s390_skeys args;
1730
1731                 r = -EFAULT;
1732                 if (copy_from_user(&args, argp,
1733                                    sizeof(struct kvm_s390_skeys)))
1734                         break;
1735                 r = kvm_s390_get_skeys(kvm, &args);
1736                 break;
1737         }
1738         case KVM_S390_SET_SKEYS: {
1739                 struct kvm_s390_skeys args;
1740
1741                 r = -EFAULT;
1742                 if (copy_from_user(&args, argp,
1743                                    sizeof(struct kvm_s390_skeys)))
1744                         break;
1745                 r = kvm_s390_set_skeys(kvm, &args);
1746                 break;
1747         }
1748         case KVM_S390_GET_CMMA_BITS: {
1749                 struct kvm_s390_cmma_log args;
1750
1751                 r = -EFAULT;
1752                 if (copy_from_user(&args, argp, sizeof(args)))
1753                         break;
1754                 r = kvm_s390_get_cmma_bits(kvm, &args);
1755                 if (!r) {
1756                         r = copy_to_user(argp, &args, sizeof(args));
1757                         if (r)
1758                                 r = -EFAULT;
1759                 }
1760                 break;
1761         }
1762         case KVM_S390_SET_CMMA_BITS: {
1763                 struct kvm_s390_cmma_log args;
1764
1765                 r = -EFAULT;
1766                 if (copy_from_user(&args, argp, sizeof(args)))
1767                         break;
1768                 r = kvm_s390_set_cmma_bits(kvm, &args);
1769                 break;
1770         }
1771         default:
1772                 r = -ENOTTY;
1773         }
1774
1775         return r;
1776 }
1777
1778 static int kvm_s390_query_ap_config(u8 *config)
1779 {
1780         u32 fcn_code = 0x04000000UL;
1781         u32 cc = 0;
1782
1783         memset(config, 0, 128);
1784         asm volatile(
1785                 "lgr 0,%1\n"
1786                 "lgr 2,%2\n"
1787                 ".long 0xb2af0000\n"            /* PQAP(QCI) */
1788                 "0: ipm %0\n"
1789                 "srl %0,28\n"
1790                 "1:\n"
1791                 EX_TABLE(0b, 1b)
1792                 : "+r" (cc)
1793                 : "r" (fcn_code), "r" (config)
1794                 : "cc", "0", "2", "memory"
1795         );
1796
1797         return cc;
1798 }
1799
1800 static int kvm_s390_apxa_installed(void)
1801 {
1802         u8 config[128];
1803         int cc;
1804
1805         if (test_facility(12)) {
1806                 cc = kvm_s390_query_ap_config(config);
1807
1808                 if (cc)
1809                         pr_err("PQAP(QCI) failed with cc=%d", cc);
1810                 else
1811                         return config[0] & 0x40;
1812         }
1813
1814         return 0;
1815 }
1816
1817 static void kvm_s390_set_crycb_format(struct kvm *kvm)
1818 {
1819         kvm->arch.crypto.crycbd = (__u32)(unsigned long) kvm->arch.crypto.crycb;
1820
1821         if (kvm_s390_apxa_installed())
1822                 kvm->arch.crypto.crycbd |= CRYCB_FORMAT2;
1823         else
1824                 kvm->arch.crypto.crycbd |= CRYCB_FORMAT1;
1825 }
1826
1827 static u64 kvm_s390_get_initial_cpuid(void)
1828 {
1829         struct cpuid cpuid;
1830
1831         get_cpu_id(&cpuid);
1832         cpuid.version = 0xff;
1833         return *((u64 *) &cpuid);
1834 }
1835
1836 static void kvm_s390_crypto_init(struct kvm *kvm)
1837 {
1838         if (!test_kvm_facility(kvm, 76))
1839                 return;
1840
1841         kvm->arch.crypto.crycb = &kvm->arch.sie_page2->crycb;
1842         kvm_s390_set_crycb_format(kvm);
1843
1844         /* Enable AES/DEA protected key functions by default */
1845         kvm->arch.crypto.aes_kw = 1;
1846         kvm->arch.crypto.dea_kw = 1;
1847         get_random_bytes(kvm->arch.crypto.crycb->aes_wrapping_key_mask,
1848                          sizeof(kvm->arch.crypto.crycb->aes_wrapping_key_mask));
1849         get_random_bytes(kvm->arch.crypto.crycb->dea_wrapping_key_mask,
1850                          sizeof(kvm->arch.crypto.crycb->dea_wrapping_key_mask));
1851 }
1852
1853 static void sca_dispose(struct kvm *kvm)
1854 {
1855         if (kvm->arch.use_esca)
1856                 free_pages_exact(kvm->arch.sca, sizeof(struct esca_block));
1857         else
1858                 free_page((unsigned long)(kvm->arch.sca));
1859         kvm->arch.sca = NULL;
1860 }
1861
1862 int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
1863 {
1864         gfp_t alloc_flags = GFP_KERNEL;
1865         int i, rc;
1866         char debug_name[16];
1867         static unsigned long sca_offset;
1868
1869         rc = -EINVAL;
1870 #ifdef CONFIG_KVM_S390_UCONTROL
1871         if (type & ~KVM_VM_S390_UCONTROL)
1872                 goto out_err;
1873         if ((type & KVM_VM_S390_UCONTROL) && (!capable(CAP_SYS_ADMIN)))
1874                 goto out_err;
1875 #else
1876         if (type)
1877                 goto out_err;
1878 #endif
1879
1880         rc = s390_enable_sie();
1881         if (rc)
1882                 goto out_err;
1883
1884         rc = -ENOMEM;
1885
1886         kvm->arch.use_esca = 0; /* start with basic SCA */
1887         if (!sclp.has_64bscao)
1888                 alloc_flags |= GFP_DMA;
1889         rwlock_init(&kvm->arch.sca_lock);
1890         kvm->arch.sca = (struct bsca_block *) get_zeroed_page(alloc_flags);
1891         if (!kvm->arch.sca)
1892                 goto out_err;
1893         spin_lock(&kvm_lock);
1894         sca_offset += 16;
1895         if (sca_offset + sizeof(struct bsca_block) > PAGE_SIZE)
1896                 sca_offset = 0;
1897         kvm->arch.sca = (struct bsca_block *)
1898                         ((char *) kvm->arch.sca + sca_offset);
1899         spin_unlock(&kvm_lock);
1900
1901         sprintf(debug_name, "kvm-%u", current->pid);
1902
1903         kvm->arch.dbf = debug_register(debug_name, 32, 1, 7 * sizeof(long));
1904         if (!kvm->arch.dbf)
1905                 goto out_err;
1906
1907         kvm->arch.sie_page2 =
1908              (struct sie_page2 *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1909         if (!kvm->arch.sie_page2)
1910                 goto out_err;
1911
1912         /* Populate the facility mask initially. */
1913         memcpy(kvm->arch.model.fac_mask, S390_lowcore.stfle_fac_list,
1914                sizeof(S390_lowcore.stfle_fac_list));
1915         for (i = 0; i < S390_ARCH_FAC_LIST_SIZE_U64; i++) {
1916                 if (i < kvm_s390_fac_list_mask_size())
1917                         kvm->arch.model.fac_mask[i] &= kvm_s390_fac_list_mask[i];
1918                 else
1919                         kvm->arch.model.fac_mask[i] = 0UL;
1920         }
1921
1922         /* Populate the facility list initially. */
1923         kvm->arch.model.fac_list = kvm->arch.sie_page2->fac_list;
1924         memcpy(kvm->arch.model.fac_list, kvm->arch.model.fac_mask,
1925                S390_ARCH_FAC_LIST_SIZE_BYTE);
1926
1927         /* we are always in czam mode - even on pre z14 machines */
1928         set_kvm_facility(kvm->arch.model.fac_mask, 138);
1929         set_kvm_facility(kvm->arch.model.fac_list, 138);
1930         /* we emulate STHYI in kvm */
1931         set_kvm_facility(kvm->arch.model.fac_mask, 74);
1932         set_kvm_facility(kvm->arch.model.fac_list, 74);
1933         if (MACHINE_HAS_TLB_GUEST) {
1934                 set_kvm_facility(kvm->arch.model.fac_mask, 147);
1935                 set_kvm_facility(kvm->arch.model.fac_list, 147);
1936         }
1937
1938         kvm->arch.model.cpuid = kvm_s390_get_initial_cpuid();
1939         kvm->arch.model.ibc = sclp.ibc & 0x0fff;
1940
1941         kvm_s390_crypto_init(kvm);
1942
1943         mutex_init(&kvm->arch.float_int.ais_lock);
1944         kvm->arch.float_int.simm = 0;
1945         kvm->arch.float_int.nimm = 0;
1946         spin_lock_init(&kvm->arch.float_int.lock);
1947         for (i = 0; i < FIRQ_LIST_COUNT; i++)
1948                 INIT_LIST_HEAD(&kvm->arch.float_int.lists[i]);
1949         init_waitqueue_head(&kvm->arch.ipte_wq);
1950         mutex_init(&kvm->arch.ipte_mutex);
1951
1952         debug_register_view(kvm->arch.dbf, &debug_sprintf_view);
1953         VM_EVENT(kvm, 3, "vm created with type %lu", type);
1954
1955         if (type & KVM_VM_S390_UCONTROL) {
1956                 kvm->arch.gmap = NULL;
1957                 kvm->arch.mem_limit = KVM_S390_NO_MEM_LIMIT;
1958         } else {
1959                 if (sclp.hamax == U64_MAX)
1960                         kvm->arch.mem_limit = TASK_SIZE_MAX;
1961                 else
1962                         kvm->arch.mem_limit = min_t(unsigned long, TASK_SIZE_MAX,
1963                                                     sclp.hamax + 1);
1964                 kvm->arch.gmap = gmap_create(current->mm, kvm->arch.mem_limit - 1);
1965                 if (!kvm->arch.gmap)
1966                         goto out_err;
1967                 kvm->arch.gmap->private = kvm;
1968                 kvm->arch.gmap->pfault_enabled = 0;
1969         }
1970
1971         kvm->arch.css_support = 0;
1972         kvm->arch.use_irqchip = 0;
1973         kvm->arch.epoch = 0;
1974
1975         spin_lock_init(&kvm->arch.start_stop_lock);
1976         kvm_s390_vsie_init(kvm);
1977         KVM_EVENT(3, "vm 0x%pK created by pid %u", kvm, current->pid);
1978
1979         return 0;
1980 out_err:
1981         free_page((unsigned long)kvm->arch.sie_page2);
1982         debug_unregister(kvm->arch.dbf);
1983         sca_dispose(kvm);
1984         KVM_EVENT(3, "creation of vm failed: %d", rc);
1985         return rc;
1986 }
1987
1988 bool kvm_arch_has_vcpu_debugfs(void)
1989 {
1990         return false;
1991 }
1992
1993 int kvm_arch_create_vcpu_debugfs(struct kvm_vcpu *vcpu)
1994 {
1995         return 0;
1996 }
1997
1998 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
1999 {
2000         VCPU_EVENT(vcpu, 3, "%s", "free cpu");
2001         trace_kvm_s390_destroy_vcpu(vcpu->vcpu_id);
2002         kvm_s390_clear_local_irqs(vcpu);
2003         kvm_clear_async_pf_completion_queue(vcpu);
2004         if (!kvm_is_ucontrol(vcpu->kvm))
2005                 sca_del_vcpu(vcpu);
2006
2007         if (kvm_is_ucontrol(vcpu->kvm))
2008                 gmap_remove(vcpu->arch.gmap);
2009
2010         if (vcpu->kvm->arch.use_cmma)
2011                 kvm_s390_vcpu_unsetup_cmma(vcpu);
2012         free_page((unsigned long)(vcpu->arch.sie_block));
2013
2014         kvm_vcpu_uninit(vcpu);
2015         kmem_cache_free(kvm_vcpu_cache, vcpu);
2016 }
2017
2018 static void kvm_free_vcpus(struct kvm *kvm)
2019 {
2020         unsigned int i;
2021         struct kvm_vcpu *vcpu;
2022
2023         kvm_for_each_vcpu(i, vcpu, kvm)
2024                 kvm_arch_vcpu_destroy(vcpu);
2025
2026         mutex_lock(&kvm->lock);
2027         for (i = 0; i < atomic_read(&kvm->online_vcpus); i++)
2028                 kvm->vcpus[i] = NULL;
2029
2030         atomic_set(&kvm->online_vcpus, 0);
2031         mutex_unlock(&kvm->lock);
2032 }
2033
2034 void kvm_arch_destroy_vm(struct kvm *kvm)
2035 {
2036         kvm_free_vcpus(kvm);
2037         sca_dispose(kvm);
2038         debug_unregister(kvm->arch.dbf);
2039         free_page((unsigned long)kvm->arch.sie_page2);
2040         if (!kvm_is_ucontrol(kvm))
2041                 gmap_remove(kvm->arch.gmap);
2042         kvm_s390_destroy_adapters(kvm);
2043         kvm_s390_clear_float_irqs(kvm);
2044         kvm_s390_vsie_destroy(kvm);
2045         if (kvm->arch.migration_state) {
2046                 vfree(kvm->arch.migration_state->pgste_bitmap);
2047                 kfree(kvm->arch.migration_state);
2048         }
2049         KVM_EVENT(3, "vm 0x%pK destroyed", kvm);
2050 }
2051
2052 /* Section: vcpu related */
2053 static int __kvm_ucontrol_vcpu_init(struct kvm_vcpu *vcpu)
2054 {
2055         vcpu->arch.gmap = gmap_create(current->mm, -1UL);
2056         if (!vcpu->arch.gmap)
2057                 return -ENOMEM;
2058         vcpu->arch.gmap->private = vcpu->kvm;
2059
2060         return 0;
2061 }
2062
2063 static void sca_del_vcpu(struct kvm_vcpu *vcpu)
2064 {
2065         if (!kvm_s390_use_sca_entries())
2066                 return;
2067         read_lock(&vcpu->kvm->arch.sca_lock);
2068         if (vcpu->kvm->arch.use_esca) {
2069                 struct esca_block *sca = vcpu->kvm->arch.sca;
2070
2071                 clear_bit_inv(vcpu->vcpu_id, (unsigned long *) sca->mcn);
2072                 sca->cpu[vcpu->vcpu_id].sda = 0;
2073         } else {
2074                 struct bsca_block *sca = vcpu->kvm->arch.sca;
2075
2076                 clear_bit_inv(vcpu->vcpu_id, (unsigned long *) &sca->mcn);
2077                 sca->cpu[vcpu->vcpu_id].sda = 0;
2078         }
2079         read_unlock(&vcpu->kvm->arch.sca_lock);
2080 }
2081
2082 static void sca_add_vcpu(struct kvm_vcpu *vcpu)
2083 {
2084         if (!kvm_s390_use_sca_entries()) {
2085                 struct bsca_block *sca = vcpu->kvm->arch.sca;
2086
2087                 /* we still need the basic sca for the ipte control */
2088                 vcpu->arch.sie_block->scaoh = (__u32)(((__u64)sca) >> 32);
2089                 vcpu->arch.sie_block->scaol = (__u32)(__u64)sca;
2090         }
2091         read_lock(&vcpu->kvm->arch.sca_lock);
2092         if (vcpu->kvm->arch.use_esca) {
2093                 struct esca_block *sca = vcpu->kvm->arch.sca;
2094
2095                 sca->cpu[vcpu->vcpu_id].sda = (__u64) vcpu->arch.sie_block;
2096                 vcpu->arch.sie_block->scaoh = (__u32)(((__u64)sca) >> 32);
2097                 vcpu->arch.sie_block->scaol = (__u32)(__u64)sca & ~0x3fU;
2098                 vcpu->arch.sie_block->ecb2 |= ECB2_ESCA;
2099                 set_bit_inv(vcpu->vcpu_id, (unsigned long *) sca->mcn);
2100         } else {
2101                 struct bsca_block *sca = vcpu->kvm->arch.sca;
2102
2103                 sca->cpu[vcpu->vcpu_id].sda = (__u64) vcpu->arch.sie_block;
2104                 vcpu->arch.sie_block->scaoh = (__u32)(((__u64)sca) >> 32);
2105                 vcpu->arch.sie_block->scaol = (__u32)(__u64)sca;
2106                 set_bit_inv(vcpu->vcpu_id, (unsigned long *) &sca->mcn);
2107         }
2108         read_unlock(&vcpu->kvm->arch.sca_lock);
2109 }
2110
2111 /* Basic SCA to Extended SCA data copy routines */
2112 static inline void sca_copy_entry(struct esca_entry *d, struct bsca_entry *s)
2113 {
2114         d->sda = s->sda;
2115         d->sigp_ctrl.c = s->sigp_ctrl.c;
2116         d->sigp_ctrl.scn = s->sigp_ctrl.scn;
2117 }
2118
2119 static void sca_copy_b_to_e(struct esca_block *d, struct bsca_block *s)
2120 {
2121         int i;
2122
2123         d->ipte_control = s->ipte_control;
2124         d->mcn[0] = s->mcn;
2125         for (i = 0; i < KVM_S390_BSCA_CPU_SLOTS; i++)
2126                 sca_copy_entry(&d->cpu[i], &s->cpu[i]);
2127 }
2128
2129 static int sca_switch_to_extended(struct kvm *kvm)
2130 {
2131         struct bsca_block *old_sca = kvm->arch.sca;
2132         struct esca_block *new_sca;
2133         struct kvm_vcpu *vcpu;
2134         unsigned int vcpu_idx;
2135         u32 scaol, scaoh;
2136
2137         new_sca = alloc_pages_exact(sizeof(*new_sca), GFP_KERNEL|__GFP_ZERO);
2138         if (!new_sca)
2139                 return -ENOMEM;
2140
2141         scaoh = (u32)((u64)(new_sca) >> 32);
2142         scaol = (u32)(u64)(new_sca) & ~0x3fU;
2143
2144         kvm_s390_vcpu_block_all(kvm);
2145         write_lock(&kvm->arch.sca_lock);
2146
2147         sca_copy_b_to_e(new_sca, old_sca);
2148
2149         kvm_for_each_vcpu(vcpu_idx, vcpu, kvm) {
2150                 vcpu->arch.sie_block->scaoh = scaoh;
2151                 vcpu->arch.sie_block->scaol = scaol;
2152                 vcpu->arch.sie_block->ecb2 |= ECB2_ESCA;
2153         }
2154         kvm->arch.sca = new_sca;
2155         kvm->arch.use_esca = 1;
2156
2157         write_unlock(&kvm->arch.sca_lock);
2158         kvm_s390_vcpu_unblock_all(kvm);
2159
2160         free_page((unsigned long)old_sca);
2161
2162         VM_EVENT(kvm, 2, "Switched to ESCA (0x%pK -> 0x%pK)",
2163                  old_sca, kvm->arch.sca);
2164         return 0;
2165 }
2166
2167 static int sca_can_add_vcpu(struct kvm *kvm, unsigned int id)
2168 {
2169         int rc;
2170
2171         if (!kvm_s390_use_sca_entries()) {
2172                 if (id < KVM_MAX_VCPUS)
2173                         return true;
2174                 return false;
2175         }
2176         if (id < KVM_S390_BSCA_CPU_SLOTS)
2177                 return true;
2178         if (!sclp.has_esca || !sclp.has_64bscao)
2179                 return false;
2180
2181         mutex_lock(&kvm->lock);
2182         rc = kvm->arch.use_esca ? 0 : sca_switch_to_extended(kvm);
2183         mutex_unlock(&kvm->lock);
2184
2185         return rc == 0 && id < KVM_S390_ESCA_CPU_SLOTS;
2186 }
2187
2188 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
2189 {
2190         vcpu->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID;
2191         kvm_clear_async_pf_completion_queue(vcpu);
2192         vcpu->run->kvm_valid_regs = KVM_SYNC_PREFIX |
2193                                     KVM_SYNC_GPRS |
2194                                     KVM_SYNC_ACRS |
2195                                     KVM_SYNC_CRS |
2196                                     KVM_SYNC_ARCH0 |
2197                                     KVM_SYNC_PFAULT;
2198         kvm_s390_set_prefix(vcpu, 0);
2199         if (test_kvm_facility(vcpu->kvm, 64))
2200                 vcpu->run->kvm_valid_regs |= KVM_SYNC_RICCB;
2201         if (test_kvm_facility(vcpu->kvm, 133))
2202                 vcpu->run->kvm_valid_regs |= KVM_SYNC_GSCB;
2203         /* fprs can be synchronized via vrs, even if the guest has no vx. With
2204          * MACHINE_HAS_VX, (load|store)_fpu_regs() will work with vrs format.
2205          */
2206         if (MACHINE_HAS_VX)
2207                 vcpu->run->kvm_valid_regs |= KVM_SYNC_VRS;
2208         else
2209                 vcpu->run->kvm_valid_regs |= KVM_SYNC_FPRS;
2210
2211         if (kvm_is_ucontrol(vcpu->kvm))
2212                 return __kvm_ucontrol_vcpu_init(vcpu);
2213
2214         return 0;
2215 }
2216
2217 /* needs disabled preemption to protect from TOD sync and vcpu_load/put */
2218 static void __start_cpu_timer_accounting(struct kvm_vcpu *vcpu)
2219 {
2220         WARN_ON_ONCE(vcpu->arch.cputm_start != 0);
2221         raw_write_seqcount_begin(&vcpu->arch.cputm_seqcount);
2222         vcpu->arch.cputm_start = get_tod_clock_fast();
2223         raw_write_seqcount_end(&vcpu->arch.cputm_seqcount);
2224 }
2225
2226 /* needs disabled preemption to protect from TOD sync and vcpu_load/put */
2227 static void __stop_cpu_timer_accounting(struct kvm_vcpu *vcpu)
2228 {
2229         WARN_ON_ONCE(vcpu->arch.cputm_start == 0);
2230         raw_write_seqcount_begin(&vcpu->arch.cputm_seqcount);
2231         vcpu->arch.sie_block->cputm -= get_tod_clock_fast() - vcpu->arch.cputm_start;
2232         vcpu->arch.cputm_start = 0;
2233         raw_write_seqcount_end(&vcpu->arch.cputm_seqcount);
2234 }
2235
2236 /* needs disabled preemption to protect from TOD sync and vcpu_load/put */
2237 static void __enable_cpu_timer_accounting(struct kvm_vcpu *vcpu)
2238 {
2239         WARN_ON_ONCE(vcpu->arch.cputm_enabled);
2240         vcpu->arch.cputm_enabled = true;
2241         __start_cpu_timer_accounting(vcpu);
2242 }
2243
2244 /* needs disabled preemption to protect from TOD sync and vcpu_load/put */
2245 static void __disable_cpu_timer_accounting(struct kvm_vcpu *vcpu)
2246 {
2247         WARN_ON_ONCE(!vcpu->arch.cputm_enabled);
2248         __stop_cpu_timer_accounting(vcpu);
2249         vcpu->arch.cputm_enabled = false;
2250 }
2251
2252 static void enable_cpu_timer_accounting(struct kvm_vcpu *vcpu)
2253 {
2254         preempt_disable(); /* protect from TOD sync and vcpu_load/put */
2255         __enable_cpu_timer_accounting(vcpu);
2256         preempt_enable();
2257 }
2258
2259 static void disable_cpu_timer_accounting(struct kvm_vcpu *vcpu)
2260 {
2261         preempt_disable(); /* protect from TOD sync and vcpu_load/put */
2262         __disable_cpu_timer_accounting(vcpu);
2263         preempt_enable();
2264 }
2265
2266 /* set the cpu timer - may only be called from the VCPU thread itself */
2267 void kvm_s390_set_cpu_timer(struct kvm_vcpu *vcpu, __u64 cputm)
2268 {
2269         preempt_disable(); /* protect from TOD sync and vcpu_load/put */
2270         raw_write_seqcount_begin(&vcpu->arch.cputm_seqcount);
2271         if (vcpu->arch.cputm_enabled)
2272                 vcpu->arch.cputm_start = get_tod_clock_fast();
2273         vcpu->arch.sie_block->cputm = cputm;
2274         raw_write_seqcount_end(&vcpu->arch.cputm_seqcount);
2275         preempt_enable();
2276 }
2277
2278 /* update and get the cpu timer - can also be called from other VCPU threads */
2279 __u64 kvm_s390_get_cpu_timer(struct kvm_vcpu *vcpu)
2280 {
2281         unsigned int seq;
2282         __u64 value;
2283
2284         if (unlikely(!vcpu->arch.cputm_enabled))
2285                 return vcpu->arch.sie_block->cputm;
2286
2287         preempt_disable(); /* protect from TOD sync and vcpu_load/put */
2288         do {
2289                 seq = raw_read_seqcount(&vcpu->arch.cputm_seqcount);
2290                 /*
2291                  * If the writer would ever execute a read in the critical
2292                  * section, e.g. in irq context, we have a deadlock.
2293                  */
2294                 WARN_ON_ONCE((seq & 1) && smp_processor_id() == vcpu->cpu);
2295                 value = vcpu->arch.sie_block->cputm;
2296                 /* if cputm_start is 0, accounting is being started/stopped */
2297                 if (likely(vcpu->arch.cputm_start))
2298                         value -= get_tod_clock_fast() - vcpu->arch.cputm_start;
2299         } while (read_seqcount_retry(&vcpu->arch.cputm_seqcount, seq & ~1));
2300         preempt_enable();
2301         return value;
2302 }
2303
2304 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
2305 {
2306
2307         gmap_enable(vcpu->arch.enabled_gmap);
2308         atomic_or(CPUSTAT_RUNNING, &vcpu->arch.sie_block->cpuflags);
2309         if (vcpu->arch.cputm_enabled && !is_vcpu_idle(vcpu))
2310                 __start_cpu_timer_accounting(vcpu);
2311         vcpu->cpu = cpu;
2312 }
2313
2314 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
2315 {
2316         vcpu->cpu = -1;
2317         if (vcpu->arch.cputm_enabled && !is_vcpu_idle(vcpu))
2318                 __stop_cpu_timer_accounting(vcpu);
2319         atomic_andnot(CPUSTAT_RUNNING, &vcpu->arch.sie_block->cpuflags);
2320         vcpu->arch.enabled_gmap = gmap_get_enabled();
2321         gmap_disable(vcpu->arch.enabled_gmap);
2322
2323 }
2324
2325 static void kvm_s390_vcpu_initial_reset(struct kvm_vcpu *vcpu)
2326 {
2327         /* this equals initial cpu reset in pop, but we don't switch to ESA */
2328         vcpu->arch.sie_block->gpsw.mask = 0UL;
2329         vcpu->arch.sie_block->gpsw.addr = 0UL;
2330         kvm_s390_set_prefix(vcpu, 0);
2331         kvm_s390_set_cpu_timer(vcpu, 0);
2332         vcpu->arch.sie_block->ckc       = 0UL;
2333         vcpu->arch.sie_block->todpr     = 0;
2334         memset(vcpu->arch.sie_block->gcr, 0, 16 * sizeof(__u64));
2335         vcpu->arch.sie_block->gcr[0]  = 0xE0UL;
2336         vcpu->arch.sie_block->gcr[14] = 0xC2000000UL;
2337         /* make sure the new fpc will be lazily loaded */
2338         save_fpu_regs();
2339         current->thread.fpu.fpc = 0;
2340         vcpu->arch.sie_block->gbea = 1;
2341         vcpu->arch.sie_block->pp = 0;
2342         vcpu->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID;
2343         kvm_clear_async_pf_completion_queue(vcpu);
2344         if (!kvm_s390_user_cpu_state_ctrl(vcpu->kvm))
2345                 kvm_s390_vcpu_stop(vcpu);
2346         kvm_s390_clear_local_irqs(vcpu);
2347 }
2348
2349 void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
2350 {
2351         mutex_lock(&vcpu->kvm->lock);
2352         preempt_disable();
2353         vcpu->arch.sie_block->epoch = vcpu->kvm->arch.epoch;
2354         preempt_enable();
2355         mutex_unlock(&vcpu->kvm->lock);
2356         if (!kvm_is_ucontrol(vcpu->kvm)) {
2357                 vcpu->arch.gmap = vcpu->kvm->arch.gmap;
2358                 sca_add_vcpu(vcpu);
2359         }
2360         if (test_kvm_facility(vcpu->kvm, 74) || vcpu->kvm->arch.user_instr0)
2361                 vcpu->arch.sie_block->ictl |= ICTL_OPEREXC;
2362         /* make vcpu_load load the right gmap on the first trigger */
2363         vcpu->arch.enabled_gmap = vcpu->arch.gmap;
2364 }
2365
2366 static void kvm_s390_vcpu_crypto_setup(struct kvm_vcpu *vcpu)
2367 {
2368         if (!test_kvm_facility(vcpu->kvm, 76))
2369                 return;
2370
2371         vcpu->arch.sie_block->ecb3 &= ~(ECB3_AES | ECB3_DEA);
2372
2373         if (vcpu->kvm->arch.crypto.aes_kw)
2374                 vcpu->arch.sie_block->ecb3 |= ECB3_AES;
2375         if (vcpu->kvm->arch.crypto.dea_kw)
2376                 vcpu->arch.sie_block->ecb3 |= ECB3_DEA;
2377
2378         vcpu->arch.sie_block->crycbd = vcpu->kvm->arch.crypto.crycbd;
2379 }
2380
2381 void kvm_s390_vcpu_unsetup_cmma(struct kvm_vcpu *vcpu)
2382 {
2383         free_page(vcpu->arch.sie_block->cbrlo);
2384         vcpu->arch.sie_block->cbrlo = 0;
2385 }
2386
2387 int kvm_s390_vcpu_setup_cmma(struct kvm_vcpu *vcpu)
2388 {
2389         vcpu->arch.sie_block->cbrlo = get_zeroed_page(GFP_KERNEL);
2390         if (!vcpu->arch.sie_block->cbrlo)
2391                 return -ENOMEM;
2392
2393         vcpu->arch.sie_block->ecb2 &= ~ECB2_PFMFI;
2394         return 0;
2395 }
2396
2397 static void kvm_s390_vcpu_setup_model(struct kvm_vcpu *vcpu)
2398 {
2399         struct kvm_s390_cpu_model *model = &vcpu->kvm->arch.model;
2400
2401         vcpu->arch.sie_block->ibc = model->ibc;
2402         if (test_kvm_facility(vcpu->kvm, 7))
2403                 vcpu->arch.sie_block->fac = (u32)(u64) model->fac_list;
2404 }
2405
2406 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
2407 {
2408         int rc = 0;
2409
2410         atomic_set(&vcpu->arch.sie_block->cpuflags, CPUSTAT_ZARCH |
2411                                                     CPUSTAT_SM |
2412                                                     CPUSTAT_STOPPED);
2413
2414         if (test_kvm_facility(vcpu->kvm, 78))
2415                 atomic_or(CPUSTAT_GED2, &vcpu->arch.sie_block->cpuflags);
2416         else if (test_kvm_facility(vcpu->kvm, 8))
2417                 atomic_or(CPUSTAT_GED, &vcpu->arch.sie_block->cpuflags);
2418
2419         kvm_s390_vcpu_setup_model(vcpu);
2420
2421         /* pgste_set_pte has special handling for !MACHINE_HAS_ESOP */
2422         if (MACHINE_HAS_ESOP)
2423                 vcpu->arch.sie_block->ecb |= ECB_HOSTPROTINT;
2424         if (test_kvm_facility(vcpu->kvm, 9))
2425                 vcpu->arch.sie_block->ecb |= ECB_SRSI;
2426         if (test_kvm_facility(vcpu->kvm, 73))
2427                 vcpu->arch.sie_block->ecb |= ECB_TE;
2428
2429         if (test_kvm_facility(vcpu->kvm, 8) && sclp.has_pfmfi)
2430                 vcpu->arch.sie_block->ecb2 |= ECB2_PFMFI;
2431         if (test_kvm_facility(vcpu->kvm, 130))
2432                 vcpu->arch.sie_block->ecb2 |= ECB2_IEP;
2433         vcpu->arch.sie_block->eca = ECA_MVPGI | ECA_PROTEXCI;
2434         if (sclp.has_cei)
2435                 vcpu->arch.sie_block->eca |= ECA_CEI;
2436         if (sclp.has_ib)
2437                 vcpu->arch.sie_block->eca |= ECA_IB;
2438         if (sclp.has_siif)
2439                 vcpu->arch.sie_block->eca |= ECA_SII;
2440         if (sclp.has_sigpif)
2441                 vcpu->arch.sie_block->eca |= ECA_SIGPI;
2442         if (test_kvm_facility(vcpu->kvm, 129)) {
2443                 vcpu->arch.sie_block->eca |= ECA_VX;
2444                 vcpu->arch.sie_block->ecd |= ECD_HOSTREGMGMT;
2445         }
2446         if (test_kvm_facility(vcpu->kvm, 139))
2447                 vcpu->arch.sie_block->ecd |= ECD_MEF;
2448
2449         vcpu->arch.sie_block->sdnxo = ((unsigned long) &vcpu->run->s.regs.sdnx)
2450                                         | SDNXC;
2451         vcpu->arch.sie_block->riccbd = (unsigned long) &vcpu->run->s.regs.riccb;
2452
2453         if (sclp.has_kss)
2454                 atomic_or(CPUSTAT_KSS, &vcpu->arch.sie_block->cpuflags);
2455         else
2456                 vcpu->arch.sie_block->ictl |= ICTL_ISKE | ICTL_SSKE | ICTL_RRBE;
2457
2458         if (vcpu->kvm->arch.use_cmma) {
2459                 rc = kvm_s390_vcpu_setup_cmma(vcpu);
2460                 if (rc)
2461                         return rc;
2462         }
2463         hrtimer_init(&vcpu->arch.ckc_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
2464         vcpu->arch.ckc_timer.function = kvm_s390_idle_wakeup;
2465
2466         kvm_s390_vcpu_crypto_setup(vcpu);
2467
2468         return rc;
2469 }
2470
2471 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
2472                                       unsigned int id)
2473 {
2474         struct kvm_vcpu *vcpu;
2475         struct sie_page *sie_page;
2476         int rc = -EINVAL;
2477
2478         if (!kvm_is_ucontrol(kvm) && !sca_can_add_vcpu(kvm, id))
2479                 goto out;
2480
2481         rc = -ENOMEM;
2482
2483         vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
2484         if (!vcpu)
2485                 goto out;
2486
2487         BUILD_BUG_ON(sizeof(struct sie_page) != 4096);
2488         sie_page = (struct sie_page *) get_zeroed_page(GFP_KERNEL);
2489         if (!sie_page)
2490                 goto out_free_cpu;
2491
2492         vcpu->arch.sie_block = &sie_page->sie_block;
2493         vcpu->arch.sie_block->itdba = (unsigned long) &sie_page->itdb;
2494
2495         /* the real guest size will always be smaller than msl */
2496         vcpu->arch.sie_block->mso = 0;
2497         vcpu->arch.sie_block->msl = sclp.hamax;
2498
2499         vcpu->arch.sie_block->icpua = id;
2500         spin_lock_init(&vcpu->arch.local_int.lock);
2501         vcpu->arch.local_int.float_int = &kvm->arch.float_int;
2502         vcpu->arch.local_int.wq = &vcpu->wq;
2503         vcpu->arch.local_int.cpuflags = &vcpu->arch.sie_block->cpuflags;
2504         seqcount_init(&vcpu->arch.cputm_seqcount);
2505
2506         rc = kvm_vcpu_init(vcpu, kvm, id);
2507         if (rc)
2508                 goto out_free_sie_block;
2509         VM_EVENT(kvm, 3, "create cpu %d at 0x%pK, sie block at 0x%pK", id, vcpu,
2510                  vcpu->arch.sie_block);
2511         trace_kvm_s390_create_vcpu(id, vcpu, vcpu->arch.sie_block);
2512
2513         return vcpu;
2514 out_free_sie_block:
2515         free_page((unsigned long)(vcpu->arch.sie_block));
2516 out_free_cpu:
2517         kmem_cache_free(kvm_vcpu_cache, vcpu);
2518 out:
2519         return ERR_PTR(rc);
2520 }
2521
2522 int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
2523 {
2524         return kvm_s390_vcpu_has_irq(vcpu, 0);
2525 }
2526
2527 bool kvm_arch_vcpu_in_kernel(struct kvm_vcpu *vcpu)
2528 {
2529         return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE);
2530 }
2531
2532 void kvm_s390_vcpu_block(struct kvm_vcpu *vcpu)
2533 {
2534         atomic_or(PROG_BLOCK_SIE, &vcpu->arch.sie_block->prog20);
2535         exit_sie(vcpu);
2536 }
2537
2538 void kvm_s390_vcpu_unblock(struct kvm_vcpu *vcpu)
2539 {
2540         atomic_andnot(PROG_BLOCK_SIE, &vcpu->arch.sie_block->prog20);
2541 }
2542
2543 static void kvm_s390_vcpu_request(struct kvm_vcpu *vcpu)
2544 {
2545         atomic_or(PROG_REQUEST, &vcpu->arch.sie_block->prog20);
2546         exit_sie(vcpu);
2547 }
2548
2549 static void kvm_s390_vcpu_request_handled(struct kvm_vcpu *vcpu)
2550 {
2551         atomic_andnot(PROG_REQUEST, &vcpu->arch.sie_block->prog20);
2552 }
2553
2554 /*
2555  * Kick a guest cpu out of SIE and wait until SIE is not running.
2556  * If the CPU is not running (e.g. waiting as idle) the function will
2557  * return immediately. */
2558 void exit_sie(struct kvm_vcpu *vcpu)
2559 {
2560         atomic_or(CPUSTAT_STOP_INT, &vcpu->arch.sie_block->cpuflags);
2561         while (vcpu->arch.sie_block->prog0c & PROG_IN_SIE)
2562                 cpu_relax();
2563 }
2564
2565 /* Kick a guest cpu out of SIE to process a request synchronously */
2566 void kvm_s390_sync_request(int req, struct kvm_vcpu *vcpu)
2567 {
2568         kvm_make_request(req, vcpu);
2569         kvm_s390_vcpu_request(vcpu);
2570 }
2571
2572 static void kvm_gmap_notifier(struct gmap *gmap, unsigned long start,
2573                               unsigned long end)
2574 {
2575         struct kvm *kvm = gmap->private;
2576         struct kvm_vcpu *vcpu;
2577         unsigned long prefix;
2578         int i;
2579
2580         if (gmap_is_shadow(gmap))
2581                 return;
2582         if (start >= 1UL << 31)
2583                 /* We are only interested in prefix pages */
2584                 return;
2585         kvm_for_each_vcpu(i, vcpu, kvm) {
2586                 /* match against both prefix pages */
2587                 prefix = kvm_s390_get_prefix(vcpu);
2588                 if (prefix <= end && start <= prefix + 2*PAGE_SIZE - 1) {
2589                         VCPU_EVENT(vcpu, 2, "gmap notifier for %lx-%lx",
2590                                    start, end);
2591                         kvm_s390_sync_request(KVM_REQ_MMU_RELOAD, vcpu);
2592                 }
2593         }
2594 }
2595
2596 int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
2597 {
2598         /* kvm common code refers to this, but never calls it */
2599         BUG();
2600         return 0;
2601 }
2602
2603 static int kvm_arch_vcpu_ioctl_get_one_reg(struct kvm_vcpu *vcpu,
2604                                            struct kvm_one_reg *reg)
2605 {
2606         int r = -EINVAL;
2607
2608         switch (reg->id) {
2609         case KVM_REG_S390_TODPR:
2610                 r = put_user(vcpu->arch.sie_block->todpr,
2611                              (u32 __user *)reg->addr);
2612                 break;
2613         case KVM_REG_S390_EPOCHDIFF:
2614                 r = put_user(vcpu->arch.sie_block->epoch,
2615                              (u64 __user *)reg->addr);
2616                 break;
2617         case KVM_REG_S390_CPU_TIMER:
2618                 r = put_user(kvm_s390_get_cpu_timer(vcpu),
2619                              (u64 __user *)reg->addr);
2620                 break;
2621         case KVM_REG_S390_CLOCK_COMP:
2622                 r = put_user(vcpu->arch.sie_block->ckc,
2623                              (u64 __user *)reg->addr);
2624                 break;
2625         case KVM_REG_S390_PFTOKEN:
2626                 r = put_user(vcpu->arch.pfault_token,
2627                              (u64 __user *)reg->addr);
2628                 break;
2629         case KVM_REG_S390_PFCOMPARE:
2630                 r = put_user(vcpu->arch.pfault_compare,
2631                              (u64 __user *)reg->addr);
2632                 break;
2633         case KVM_REG_S390_PFSELECT:
2634                 r = put_user(vcpu->arch.pfault_select,
2635                              (u64 __user *)reg->addr);
2636                 break;
2637         case KVM_REG_S390_PP:
2638                 r = put_user(vcpu->arch.sie_block->pp,
2639                              (u64 __user *)reg->addr);
2640                 break;
2641         case KVM_REG_S390_GBEA:
2642                 r = put_user(vcpu->arch.sie_block->gbea,
2643                              (u64 __user *)reg->addr);
2644                 break;
2645         default:
2646                 break;
2647         }
2648
2649         return r;
2650 }
2651
2652 static int kvm_arch_vcpu_ioctl_set_one_reg(struct kvm_vcpu *vcpu,
2653                                            struct kvm_one_reg *reg)
2654 {
2655         int r = -EINVAL;
2656         __u64 val;
2657
2658         switch (reg->id) {
2659         case KVM_REG_S390_TODPR:
2660                 r = get_user(vcpu->arch.sie_block->todpr,
2661                              (u32 __user *)reg->addr);
2662                 break;
2663         case KVM_REG_S390_EPOCHDIFF:
2664                 r = get_user(vcpu->arch.sie_block->epoch,
2665                              (u64 __user *)reg->addr);
2666                 break;
2667         case KVM_REG_S390_CPU_TIMER:
2668                 r = get_user(val, (u64 __user *)reg->addr);
2669                 if (!r)
2670                         kvm_s390_set_cpu_timer(vcpu, val);
2671                 break;
2672         case KVM_REG_S390_CLOCK_COMP:
2673                 r = get_user(vcpu->arch.sie_block->ckc,
2674                              (u64 __user *)reg->addr);
2675                 break;
2676         case KVM_REG_S390_PFTOKEN:
2677                 r = get_user(vcpu->arch.pfault_token,
2678                              (u64 __user *)reg->addr);
2679                 if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID)
2680                         kvm_clear_async_pf_completion_queue(vcpu);
2681                 break;
2682         case KVM_REG_S390_PFCOMPARE:
2683                 r = get_user(vcpu->arch.pfault_compare,
2684                              (u64 __user *)reg->addr);
2685                 break;
2686         case KVM_REG_S390_PFSELECT:
2687                 r = get_user(vcpu->arch.pfault_select,
2688                              (u64 __user *)reg->addr);
2689                 break;
2690         case KVM_REG_S390_PP:
2691                 r = get_user(vcpu->arch.sie_block->pp,
2692                              (u64 __user *)reg->addr);
2693                 break;
2694         case KVM_REG_S390_GBEA:
2695                 r = get_user(vcpu->arch.sie_block->gbea,
2696                              (u64 __user *)reg->addr);
2697                 break;
2698         default:
2699                 break;
2700         }
2701
2702         return r;
2703 }
2704
2705 static int kvm_arch_vcpu_ioctl_initial_reset(struct kvm_vcpu *vcpu)
2706 {
2707         kvm_s390_vcpu_initial_reset(vcpu);
2708         return 0;
2709 }
2710
2711 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
2712 {
2713         memcpy(&vcpu->run->s.regs.gprs, &regs->gprs, sizeof(regs->gprs));
2714         return 0;
2715 }
2716
2717 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
2718 {
2719         memcpy(&regs->gprs, &vcpu->run->s.regs.gprs, sizeof(regs->gprs));
2720         return 0;
2721 }
2722
2723 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
2724                                   struct kvm_sregs *sregs)
2725 {
2726         memcpy(&vcpu->run->s.regs.acrs, &sregs->acrs, sizeof(sregs->acrs));
2727         memcpy(&vcpu->arch.sie_block->gcr, &sregs->crs, sizeof(sregs->crs));
2728         return 0;
2729 }
2730
2731 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
2732                                   struct kvm_sregs *sregs)
2733 {
2734         memcpy(&sregs->acrs, &vcpu->run->s.regs.acrs, sizeof(sregs->acrs));
2735         memcpy(&sregs->crs, &vcpu->arch.sie_block->gcr, sizeof(sregs->crs));
2736         return 0;
2737 }
2738
2739 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
2740 {
2741         if (test_fp_ctl(fpu->fpc))
2742                 return -EINVAL;
2743         vcpu->run->s.regs.fpc = fpu->fpc;
2744         if (MACHINE_HAS_VX)
2745                 convert_fp_to_vx((__vector128 *) vcpu->run->s.regs.vrs,
2746                                  (freg_t *) fpu->fprs);
2747         else
2748                 memcpy(vcpu->run->s.regs.fprs, &fpu->fprs, sizeof(fpu->fprs));
2749         return 0;
2750 }
2751
2752 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
2753 {
2754         /* make sure we have the latest values */
2755         save_fpu_regs();
2756         if (MACHINE_HAS_VX)
2757                 convert_vx_to_fp((freg_t *) fpu->fprs,
2758                                  (__vector128 *) vcpu->run->s.regs.vrs);
2759         else
2760                 memcpy(fpu->fprs, vcpu->run->s.regs.fprs, sizeof(fpu->fprs));
2761         fpu->fpc = vcpu->run->s.regs.fpc;
2762         return 0;
2763 }
2764
2765 static int kvm_arch_vcpu_ioctl_set_initial_psw(struct kvm_vcpu *vcpu, psw_t psw)
2766 {
2767         int rc = 0;
2768
2769         if (!is_vcpu_stopped(vcpu))
2770                 rc = -EBUSY;
2771         else {
2772                 vcpu->run->psw_mask = psw.mask;
2773                 vcpu->run->psw_addr = psw.addr;
2774         }
2775         return rc;
2776 }
2777
2778 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
2779                                   struct kvm_translation *tr)
2780 {
2781         return -EINVAL; /* not implemented yet */
2782 }
2783
2784 #define VALID_GUESTDBG_FLAGS (KVM_GUESTDBG_SINGLESTEP | \
2785                               KVM_GUESTDBG_USE_HW_BP | \
2786                               KVM_GUESTDBG_ENABLE)
2787
2788 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
2789                                         struct kvm_guest_debug *dbg)
2790 {
2791         int rc = 0;
2792
2793         vcpu->guest_debug = 0;
2794         kvm_s390_clear_bp_data(vcpu);
2795
2796         if (dbg->control & ~VALID_GUESTDBG_FLAGS)
2797                 return -EINVAL;
2798         if (!sclp.has_gpere)
2799                 return -EINVAL;
2800
2801         if (dbg->control & KVM_GUESTDBG_ENABLE) {
2802                 vcpu->guest_debug = dbg->control;
2803                 /* enforce guest PER */
2804                 atomic_or(CPUSTAT_P, &vcpu->arch.sie_block->cpuflags);
2805
2806                 if (dbg->control & KVM_GUESTDBG_USE_HW_BP)
2807                         rc = kvm_s390_import_bp_data(vcpu, dbg);
2808         } else {
2809                 atomic_andnot(CPUSTAT_P, &vcpu->arch.sie_block->cpuflags);
2810                 vcpu->arch.guestdbg.last_bp = 0;
2811         }
2812
2813         if (rc) {
2814                 vcpu->guest_debug = 0;
2815                 kvm_s390_clear_bp_data(vcpu);
2816                 atomic_andnot(CPUSTAT_P, &vcpu->arch.sie_block->cpuflags);
2817         }
2818
2819         return rc;
2820 }
2821
2822 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
2823                                     struct kvm_mp_state *mp_state)
2824 {
2825         /* CHECK_STOP and LOAD are not supported yet */
2826         return is_vcpu_stopped(vcpu) ? KVM_MP_STATE_STOPPED :
2827                                        KVM_MP_STATE_OPERATING;
2828 }
2829
2830 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
2831                                     struct kvm_mp_state *mp_state)
2832 {
2833         int rc = 0;
2834
2835         /* user space knows about this interface - let it control the state */
2836         vcpu->kvm->arch.user_cpu_state_ctrl = 1;
2837
2838         switch (mp_state->mp_state) {
2839         case KVM_MP_STATE_STOPPED:
2840                 kvm_s390_vcpu_stop(vcpu);
2841                 break;
2842         case KVM_MP_STATE_OPERATING:
2843                 kvm_s390_vcpu_start(vcpu);
2844                 break;
2845         case KVM_MP_STATE_LOAD:
2846         case KVM_MP_STATE_CHECK_STOP:
2847                 /* fall through - CHECK_STOP and LOAD are not supported yet */
2848         default:
2849                 rc = -ENXIO;
2850         }
2851
2852         return rc;
2853 }
2854
2855 static bool ibs_enabled(struct kvm_vcpu *vcpu)
2856 {
2857         return atomic_read(&vcpu->arch.sie_block->cpuflags) & CPUSTAT_IBS;
2858 }
2859
2860 static int kvm_s390_handle_requests(struct kvm_vcpu *vcpu)
2861 {
2862 retry:
2863         kvm_s390_vcpu_request_handled(vcpu);
2864         if (!kvm_request_pending(vcpu))
2865                 return 0;
2866         /*
2867          * We use MMU_RELOAD just to re-arm the ipte notifier for the
2868          * guest prefix page. gmap_mprotect_notify will wait on the ptl lock.
2869          * This ensures that the ipte instruction for this request has
2870          * already finished. We might race against a second unmapper that
2871          * wants to set the blocking bit. Lets just retry the request loop.
2872          */
2873         if (kvm_check_request(KVM_REQ_MMU_RELOAD, vcpu)) {
2874                 int rc;
2875                 rc = gmap_mprotect_notify(vcpu->arch.gmap,
2876                                           kvm_s390_get_prefix(vcpu),
2877                                           PAGE_SIZE * 2, PROT_WRITE);
2878                 if (rc) {
2879                         kvm_make_request(KVM_REQ_MMU_RELOAD, vcpu);
2880                         return rc;
2881                 }
2882                 goto retry;
2883         }
2884
2885         if (kvm_check_request(KVM_REQ_TLB_FLUSH, vcpu)) {
2886                 vcpu->arch.sie_block->ihcpu = 0xffff;
2887                 goto retry;
2888         }
2889
2890         if (kvm_check_request(KVM_REQ_ENABLE_IBS, vcpu)) {
2891                 if (!ibs_enabled(vcpu)) {
2892                         trace_kvm_s390_enable_disable_ibs(vcpu->vcpu_id, 1);
2893                         atomic_or(CPUSTAT_IBS,
2894                                         &vcpu->arch.sie_block->cpuflags);
2895                 }
2896                 goto retry;
2897         }
2898
2899         if (kvm_check_request(KVM_REQ_DISABLE_IBS, vcpu)) {
2900                 if (ibs_enabled(vcpu)) {
2901                         trace_kvm_s390_enable_disable_ibs(vcpu->vcpu_id, 0);
2902                         atomic_andnot(CPUSTAT_IBS,
2903                                           &vcpu->arch.sie_block->cpuflags);
2904                 }
2905                 goto retry;
2906         }
2907
2908         if (kvm_check_request(KVM_REQ_ICPT_OPEREXC, vcpu)) {
2909                 vcpu->arch.sie_block->ictl |= ICTL_OPEREXC;
2910                 goto retry;
2911         }
2912
2913         if (kvm_check_request(KVM_REQ_START_MIGRATION, vcpu)) {
2914                 /*
2915                  * Disable CMMA virtualization; we will emulate the ESSA
2916                  * instruction manually, in order to provide additional
2917                  * functionalities needed for live migration.
2918                  */
2919                 vcpu->arch.sie_block->ecb2 &= ~ECB2_CMMA;
2920                 goto retry;
2921         }
2922
2923         if (kvm_check_request(KVM_REQ_STOP_MIGRATION, vcpu)) {
2924                 /*
2925                  * Re-enable CMMA virtualization if CMMA is available and
2926                  * was used.
2927                  */
2928                 if ((vcpu->kvm->arch.use_cmma) &&
2929                     (vcpu->kvm->mm->context.use_cmma))
2930                         vcpu->arch.sie_block->ecb2 |= ECB2_CMMA;
2931                 goto retry;
2932         }
2933
2934         /* nothing to do, just clear the request */
2935         kvm_clear_request(KVM_REQ_UNHALT, vcpu);
2936
2937         return 0;
2938 }
2939
2940 void kvm_s390_set_tod_clock_ext(struct kvm *kvm,
2941                                  const struct kvm_s390_vm_tod_clock *gtod)
2942 {
2943         struct kvm_vcpu *vcpu;
2944         struct kvm_s390_tod_clock_ext htod;
2945         int i;
2946
2947         mutex_lock(&kvm->lock);
2948         preempt_disable();
2949
2950         get_tod_clock_ext((char *)&htod);
2951
2952         kvm->arch.epoch = gtod->tod - htod.tod;
2953         kvm->arch.epdx = gtod->epoch_idx - htod.epoch_idx;
2954
2955         if (kvm->arch.epoch > gtod->tod)
2956                 kvm->arch.epdx -= 1;
2957
2958         kvm_s390_vcpu_block_all(kvm);
2959         kvm_for_each_vcpu(i, vcpu, kvm) {
2960                 vcpu->arch.sie_block->epoch = kvm->arch.epoch;
2961                 vcpu->arch.sie_block->epdx  = kvm->arch.epdx;
2962         }
2963
2964         kvm_s390_vcpu_unblock_all(kvm);
2965         preempt_enable();
2966         mutex_unlock(&kvm->lock);
2967 }
2968
2969 void kvm_s390_set_tod_clock(struct kvm *kvm, u64 tod)
2970 {
2971         struct kvm_vcpu *vcpu;
2972         int i;
2973
2974         mutex_lock(&kvm->lock);
2975         preempt_disable();
2976         kvm->arch.epoch = tod - get_tod_clock();
2977         kvm_s390_vcpu_block_all(kvm);
2978         kvm_for_each_vcpu(i, vcpu, kvm)
2979                 vcpu->arch.sie_block->epoch = kvm->arch.epoch;
2980         kvm_s390_vcpu_unblock_all(kvm);
2981         preempt_enable();
2982         mutex_unlock(&kvm->lock);
2983 }
2984
2985 /**
2986  * kvm_arch_fault_in_page - fault-in guest page if necessary
2987  * @vcpu: The corresponding virtual cpu
2988  * @gpa: Guest physical address
2989  * @writable: Whether the page should be writable or not
2990  *
2991  * Make sure that a guest page has been faulted-in on the host.
2992  *
2993  * Return: Zero on success, negative error code otherwise.
2994  */
2995 long kvm_arch_fault_in_page(struct kvm_vcpu *vcpu, gpa_t gpa, int writable)
2996 {
2997         return gmap_fault(vcpu->arch.gmap, gpa,
2998                           writable ? FAULT_FLAG_WRITE : 0);
2999 }
3000
3001 static void __kvm_inject_pfault_token(struct kvm_vcpu *vcpu, bool start_token,
3002                                       unsigned long token)
3003 {
3004         struct kvm_s390_interrupt inti;
3005         struct kvm_s390_irq irq;
3006
3007         if (start_token) {
3008                 irq.u.ext.ext_params2 = token;
3009                 irq.type = KVM_S390_INT_PFAULT_INIT;
3010                 WARN_ON_ONCE(kvm_s390_inject_vcpu(vcpu, &irq));
3011         } else {
3012                 inti.type = KVM_S390_INT_PFAULT_DONE;
3013                 inti.parm64 = token;
3014                 WARN_ON_ONCE(kvm_s390_inject_vm(vcpu->kvm, &inti));
3015         }
3016 }
3017
3018 void kvm_arch_async_page_not_present(struct kvm_vcpu *vcpu,
3019                                      struct kvm_async_pf *work)
3020 {
3021         trace_kvm_s390_pfault_init(vcpu, work->arch.pfault_token);
3022         __kvm_inject_pfault_token(vcpu, true, work->arch.pfault_token);
3023 }
3024
3025 void kvm_arch_async_page_present(struct kvm_vcpu *vcpu,
3026                                  struct kvm_async_pf *work)
3027 {
3028         trace_kvm_s390_pfault_done(vcpu, work->arch.pfault_token);
3029         __kvm_inject_pfault_token(vcpu, false, work->arch.pfault_token);
3030 }
3031
3032 void kvm_arch_async_page_ready(struct kvm_vcpu *vcpu,
3033                                struct kvm_async_pf *work)
3034 {
3035         /* s390 will always inject the page directly */
3036 }
3037
3038 bool kvm_arch_can_inject_async_page_present(struct kvm_vcpu *vcpu)
3039 {
3040         /*
3041          * s390 will always inject the page directly,
3042          * but we still want check_async_completion to cleanup
3043          */
3044         return true;
3045 }
3046
3047 static int kvm_arch_setup_async_pf(struct kvm_vcpu *vcpu)
3048 {
3049         hva_t hva;
3050         struct kvm_arch_async_pf arch;
3051         int rc;
3052
3053         if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID)
3054                 return 0;
3055         if ((vcpu->arch.sie_block->gpsw.mask & vcpu->arch.pfault_select) !=
3056             vcpu->arch.pfault_compare)
3057                 return 0;
3058         if (psw_extint_disabled(vcpu))
3059                 return 0;
3060         if (kvm_s390_vcpu_has_irq(vcpu, 0))
3061                 return 0;
3062         if (!(vcpu->arch.sie_block->gcr[0] & 0x200ul))
3063                 return 0;
3064         if (!vcpu->arch.gmap->pfault_enabled)
3065                 return 0;
3066
3067         hva = gfn_to_hva(vcpu->kvm, gpa_to_gfn(current->thread.gmap_addr));
3068         hva += current->thread.gmap_addr & ~PAGE_MASK;
3069         if (read_guest_real(vcpu, vcpu->arch.pfault_token, &arch.pfault_token, 8))
3070                 return 0;
3071
3072         rc = kvm_setup_async_pf(vcpu, current->thread.gmap_addr, hva, &arch);
3073         return rc;
3074 }
3075
3076 static int vcpu_pre_run(struct kvm_vcpu *vcpu)
3077 {
3078         int rc, cpuflags;
3079
3080         /*
3081          * On s390 notifications for arriving pages will be delivered directly
3082          * to the guest but the house keeping for completed pfaults is
3083          * handled outside the worker.
3084          */
3085         kvm_check_async_pf_completion(vcpu);
3086
3087         vcpu->arch.sie_block->gg14 = vcpu->run->s.regs.gprs[14];
3088         vcpu->arch.sie_block->gg15 = vcpu->run->s.regs.gprs[15];
3089
3090         if (need_resched())
3091                 schedule();
3092
3093         if (test_cpu_flag(CIF_MCCK_PENDING))
3094                 s390_handle_mcck();
3095
3096         if (!kvm_is_ucontrol(vcpu->kvm)) {
3097                 rc = kvm_s390_deliver_pending_interrupts(vcpu);
3098                 if (rc)
3099                         return rc;
3100         }
3101
3102         rc = kvm_s390_handle_requests(vcpu);
3103         if (rc)
3104                 return rc;
3105
3106         if (guestdbg_enabled(vcpu)) {
3107                 kvm_s390_backup_guest_per_regs(vcpu);
3108                 kvm_s390_patch_guest_per_regs(vcpu);
3109         }
3110
3111         vcpu->arch.sie_block->icptcode = 0;
3112         cpuflags = atomic_read(&vcpu->arch.sie_block->cpuflags);
3113         VCPU_EVENT(vcpu, 6, "entering sie flags %x", cpuflags);
3114         trace_kvm_s390_sie_enter(vcpu, cpuflags);
3115
3116         return 0;
3117 }
3118
3119 static int vcpu_post_run_fault_in_sie(struct kvm_vcpu *vcpu)
3120 {
3121         struct kvm_s390_pgm_info pgm_info = {
3122                 .code = PGM_ADDRESSING,
3123         };
3124         u8 opcode, ilen;
3125         int rc;
3126
3127         VCPU_EVENT(vcpu, 3, "%s", "fault in sie instruction");
3128         trace_kvm_s390_sie_fault(vcpu);
3129
3130         /*
3131          * We want to inject an addressing exception, which is defined as a
3132          * suppressing or terminating exception. However, since we came here
3133          * by a DAT access exception, the PSW still points to the faulting
3134          * instruction since DAT exceptions are nullifying. So we've got
3135          * to look up the current opcode to get the length of the instruction
3136          * to be able to forward the PSW.
3137          */
3138         rc = read_guest_instr(vcpu, vcpu->arch.sie_block->gpsw.addr, &opcode, 1);
3139         ilen = insn_length(opcode);
3140         if (rc < 0) {
3141                 return rc;
3142         } else if (rc) {
3143                 /* Instruction-Fetching Exceptions - we can't detect the ilen.
3144                  * Forward by arbitrary ilc, injection will take care of
3145                  * nullification if necessary.
3146                  */
3147                 pgm_info = vcpu->arch.pgm;
3148                 ilen = 4;
3149         }
3150         pgm_info.flags = ilen | KVM_S390_PGM_FLAGS_ILC_VALID;
3151         kvm_s390_forward_psw(vcpu, ilen);
3152         return kvm_s390_inject_prog_irq(vcpu, &pgm_info);
3153 }
3154
3155 static int vcpu_post_run(struct kvm_vcpu *vcpu, int exit_reason)
3156 {
3157         struct mcck_volatile_info *mcck_info;
3158         struct sie_page *sie_page;
3159
3160         VCPU_EVENT(vcpu, 6, "exit sie icptcode %d",
3161                    vcpu->arch.sie_block->icptcode);
3162         trace_kvm_s390_sie_exit(vcpu, vcpu->arch.sie_block->icptcode);
3163
3164         if (guestdbg_enabled(vcpu))
3165                 kvm_s390_restore_guest_per_regs(vcpu);
3166
3167         vcpu->run->s.regs.gprs[14] = vcpu->arch.sie_block->gg14;
3168         vcpu->run->s.regs.gprs[15] = vcpu->arch.sie_block->gg15;
3169
3170         if (exit_reason == -EINTR) {
3171                 VCPU_EVENT(vcpu, 3, "%s", "machine check");
3172                 sie_page = container_of(vcpu->arch.sie_block,
3173                                         struct sie_page, sie_block);
3174                 mcck_info = &sie_page->mcck_info;
3175                 kvm_s390_reinject_machine_check(vcpu, mcck_info);
3176                 return 0;
3177         }
3178
3179         if (vcpu->arch.sie_block->icptcode > 0) {
3180                 int rc = kvm_handle_sie_intercept(vcpu);
3181
3182                 if (rc != -EOPNOTSUPP)
3183                         return rc;
3184                 vcpu->run->exit_reason = KVM_EXIT_S390_SIEIC;
3185                 vcpu->run->s390_sieic.icptcode = vcpu->arch.sie_block->icptcode;
3186                 vcpu->run->s390_sieic.ipa = vcpu->arch.sie_block->ipa;
3187                 vcpu->run->s390_sieic.ipb = vcpu->arch.sie_block->ipb;
3188                 return -EREMOTE;
3189         } else if (exit_reason != -EFAULT) {
3190                 vcpu->stat.exit_null++;
3191                 return 0;
3192         } else if (kvm_is_ucontrol(vcpu->kvm)) {
3193                 vcpu->run->exit_reason = KVM_EXIT_S390_UCONTROL;
3194                 vcpu->run->s390_ucontrol.trans_exc_code =
3195                                                 current->thread.gmap_addr;
3196                 vcpu->run->s390_ucontrol.pgm_code = 0x10;
3197                 return -EREMOTE;
3198         } else if (current->thread.gmap_pfault) {
3199                 trace_kvm_s390_major_guest_pfault(vcpu);
3200                 current->thread.gmap_pfault = 0;
3201                 if (kvm_arch_setup_async_pf(vcpu))
3202                         return 0;
3203                 return kvm_arch_fault_in_page(vcpu, current->thread.gmap_addr, 1);
3204         }
3205         return vcpu_post_run_fault_in_sie(vcpu);
3206 }
3207
3208 static int __vcpu_run(struct kvm_vcpu *vcpu)
3209 {
3210         int rc, exit_reason;
3211
3212         /*
3213          * We try to hold kvm->srcu during most of vcpu_run (except when run-
3214          * ning the guest), so that memslots (and other stuff) are protected
3215          */
3216         vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
3217
3218         do {
3219                 rc = vcpu_pre_run(vcpu);
3220                 if (rc)
3221                         break;
3222
3223                 srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
3224                 /*
3225                  * As PF_VCPU will be used in fault handler, between
3226                  * guest_enter and guest_exit should be no uaccess.
3227                  */
3228                 local_irq_disable();
3229                 guest_enter_irqoff();
3230                 __disable_cpu_timer_accounting(vcpu);
3231                 local_irq_enable();
3232                 exit_reason = sie64a(vcpu->arch.sie_block,
3233                                      vcpu->run->s.regs.gprs);
3234                 local_irq_disable();
3235                 __enable_cpu_timer_accounting(vcpu);
3236                 guest_exit_irqoff();
3237                 local_irq_enable();
3238                 vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
3239
3240                 rc = vcpu_post_run(vcpu, exit_reason);
3241         } while (!signal_pending(current) && !guestdbg_exit_pending(vcpu) && !rc);
3242
3243         srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
3244         return rc;
3245 }
3246
3247 static void sync_regs(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)