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Linux/arch/x86/kvm/hyperv.c

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  1 /*
  2  * KVM Microsoft Hyper-V emulation
  3  *
  4  * derived from arch/x86/kvm/x86.c
  5  *
  6  * Copyright (C) 2006 Qumranet, Inc.
  7  * Copyright (C) 2008 Qumranet, Inc.
  8  * Copyright IBM Corporation, 2008
  9  * Copyright 2010 Red Hat, Inc. and/or its affiliates.
 10  * Copyright (C) 2015 Andrey Smetanin <asmetanin@virtuozzo.com>
 11  *
 12  * Authors:
 13  *   Avi Kivity   <avi@qumranet.com>
 14  *   Yaniv Kamay  <yaniv@qumranet.com>
 15  *   Amit Shah    <amit.shah@qumranet.com>
 16  *   Ben-Ami Yassour <benami@il.ibm.com>
 17  *   Andrey Smetanin <asmetanin@virtuozzo.com>
 18  *
 19  * This work is licensed under the terms of the GNU GPL, version 2.  See
 20  * the COPYING file in the top-level directory.
 21  *
 22  */
 23 
 24 #include "x86.h"
 25 #include "lapic.h"
 26 #include "ioapic.h"
 27 #include "hyperv.h"
 28 
 29 #include <linux/kvm_host.h>
 30 #include <linux/highmem.h>
 31 #include <asm/apicdef.h>
 32 #include <trace/events/kvm.h>
 33 
 34 #include "trace.h"
 35 
 36 static inline u64 synic_read_sint(struct kvm_vcpu_hv_synic *synic, int sint)
 37 {
 38         return atomic64_read(&synic->sint[sint]);
 39 }
 40 
 41 static inline int synic_get_sint_vector(u64 sint_value)
 42 {
 43         if (sint_value & HV_SYNIC_SINT_MASKED)
 44                 return -1;
 45         return sint_value & HV_SYNIC_SINT_VECTOR_MASK;
 46 }
 47 
 48 static bool synic_has_vector_connected(struct kvm_vcpu_hv_synic *synic,
 49                                       int vector)
 50 {
 51         int i;
 52 
 53         for (i = 0; i < ARRAY_SIZE(synic->sint); i++) {
 54                 if (synic_get_sint_vector(synic_read_sint(synic, i)) == vector)
 55                         return true;
 56         }
 57         return false;
 58 }
 59 
 60 static bool synic_has_vector_auto_eoi(struct kvm_vcpu_hv_synic *synic,
 61                                      int vector)
 62 {
 63         int i;
 64         u64 sint_value;
 65 
 66         for (i = 0; i < ARRAY_SIZE(synic->sint); i++) {
 67                 sint_value = synic_read_sint(synic, i);
 68                 if (synic_get_sint_vector(sint_value) == vector &&
 69                     sint_value & HV_SYNIC_SINT_AUTO_EOI)
 70                         return true;
 71         }
 72         return false;
 73 }
 74 
 75 static int synic_set_sint(struct kvm_vcpu_hv_synic *synic, int sint,
 76                           u64 data, bool host)
 77 {
 78         int vector;
 79 
 80         vector = data & HV_SYNIC_SINT_VECTOR_MASK;
 81         if (vector < 16 && !host)
 82                 return 1;
 83         /*
 84          * Guest may configure multiple SINTs to use the same vector, so
 85          * we maintain a bitmap of vectors handled by synic, and a
 86          * bitmap of vectors with auto-eoi behavior.  The bitmaps are
 87          * updated here, and atomically queried on fast paths.
 88          */
 89 
 90         atomic64_set(&synic->sint[sint], data);
 91 
 92         if (synic_has_vector_connected(synic, vector))
 93                 __set_bit(vector, synic->vec_bitmap);
 94         else
 95                 __clear_bit(vector, synic->vec_bitmap);
 96 
 97         if (synic_has_vector_auto_eoi(synic, vector))
 98                 __set_bit(vector, synic->auto_eoi_bitmap);
 99         else
100                 __clear_bit(vector, synic->auto_eoi_bitmap);
101 
102         /* Load SynIC vectors into EOI exit bitmap */
103         kvm_make_request(KVM_REQ_SCAN_IOAPIC, synic_to_vcpu(synic));
104         return 0;
105 }
106 
107 static struct kvm_vcpu_hv_synic *synic_get(struct kvm *kvm, u32 vcpu_id)
108 {
109         struct kvm_vcpu *vcpu;
110         struct kvm_vcpu_hv_synic *synic;
111 
112         if (vcpu_id >= atomic_read(&kvm->online_vcpus))
113                 return NULL;
114         vcpu = kvm_get_vcpu(kvm, vcpu_id);
115         if (!vcpu)
116                 return NULL;
117         synic = vcpu_to_synic(vcpu);
118         return (synic->active) ? synic : NULL;
119 }
120 
121 static void synic_clear_sint_msg_pending(struct kvm_vcpu_hv_synic *synic,
122                                         u32 sint)
123 {
124         struct kvm_vcpu *vcpu = synic_to_vcpu(synic);
125         struct page *page;
126         gpa_t gpa;
127         struct hv_message *msg;
128         struct hv_message_page *msg_page;
129 
130         gpa = synic->msg_page & PAGE_MASK;
131         page = kvm_vcpu_gfn_to_page(vcpu, gpa >> PAGE_SHIFT);
132         if (is_error_page(page)) {
133                 vcpu_err(vcpu, "Hyper-V SynIC can't get msg page, gpa 0x%llx\n",
134                          gpa);
135                 return;
136         }
137         msg_page = kmap_atomic(page);
138 
139         msg = &msg_page->sint_message[sint];
140         msg->header.message_flags.msg_pending = 0;
141 
142         kunmap_atomic(msg_page);
143         kvm_release_page_dirty(page);
144         kvm_vcpu_mark_page_dirty(vcpu, gpa >> PAGE_SHIFT);
145 }
146 
147 static void kvm_hv_notify_acked_sint(struct kvm_vcpu *vcpu, u32 sint)
148 {
149         struct kvm *kvm = vcpu->kvm;
150         struct kvm_vcpu_hv_synic *synic = vcpu_to_synic(vcpu);
151         struct kvm_vcpu_hv *hv_vcpu = vcpu_to_hv_vcpu(vcpu);
152         struct kvm_vcpu_hv_stimer *stimer;
153         int gsi, idx, stimers_pending;
154 
155         trace_kvm_hv_notify_acked_sint(vcpu->vcpu_id, sint);
156 
157         if (synic->msg_page & HV_SYNIC_SIMP_ENABLE)
158                 synic_clear_sint_msg_pending(synic, sint);
159 
160         /* Try to deliver pending Hyper-V SynIC timers messages */
161         stimers_pending = 0;
162         for (idx = 0; idx < ARRAY_SIZE(hv_vcpu->stimer); idx++) {
163                 stimer = &hv_vcpu->stimer[idx];
164                 if (stimer->msg_pending &&
165                     (stimer->config & HV_STIMER_ENABLE) &&
166                     HV_STIMER_SINT(stimer->config) == sint) {
167                         set_bit(stimer->index,
168                                 hv_vcpu->stimer_pending_bitmap);
169                         stimers_pending++;
170                 }
171         }
172         if (stimers_pending)
173                 kvm_make_request(KVM_REQ_HV_STIMER, vcpu);
174 
175         idx = srcu_read_lock(&kvm->irq_srcu);
176         gsi = atomic_read(&synic->sint_to_gsi[sint]);
177         if (gsi != -1)
178                 kvm_notify_acked_gsi(kvm, gsi);
179         srcu_read_unlock(&kvm->irq_srcu, idx);
180 }
181 
182 static void synic_exit(struct kvm_vcpu_hv_synic *synic, u32 msr)
183 {
184         struct kvm_vcpu *vcpu = synic_to_vcpu(synic);
185         struct kvm_vcpu_hv *hv_vcpu = &vcpu->arch.hyperv;
186 
187         hv_vcpu->exit.type = KVM_EXIT_HYPERV_SYNIC;
188         hv_vcpu->exit.u.synic.msr = msr;
189         hv_vcpu->exit.u.synic.control = synic->control;
190         hv_vcpu->exit.u.synic.evt_page = synic->evt_page;
191         hv_vcpu->exit.u.synic.msg_page = synic->msg_page;
192 
193         kvm_make_request(KVM_REQ_HV_EXIT, vcpu);
194 }
195 
196 static int synic_set_msr(struct kvm_vcpu_hv_synic *synic,
197                          u32 msr, u64 data, bool host)
198 {
199         struct kvm_vcpu *vcpu = synic_to_vcpu(synic);
200         int ret;
201 
202         if (!synic->active)
203                 return 1;
204 
205         trace_kvm_hv_synic_set_msr(vcpu->vcpu_id, msr, data, host);
206 
207         ret = 0;
208         switch (msr) {
209         case HV_X64_MSR_SCONTROL:
210                 synic->control = data;
211                 if (!host)
212                         synic_exit(synic, msr);
213                 break;
214         case HV_X64_MSR_SVERSION:
215                 if (!host) {
216                         ret = 1;
217                         break;
218                 }
219                 synic->version = data;
220                 break;
221         case HV_X64_MSR_SIEFP:
222                 if (data & HV_SYNIC_SIEFP_ENABLE)
223                         if (kvm_clear_guest(vcpu->kvm,
224                                             data & PAGE_MASK, PAGE_SIZE)) {
225                                 ret = 1;
226                                 break;
227                         }
228                 synic->evt_page = data;
229                 if (!host)
230                         synic_exit(synic, msr);
231                 break;
232         case HV_X64_MSR_SIMP:
233                 if (data & HV_SYNIC_SIMP_ENABLE)
234                         if (kvm_clear_guest(vcpu->kvm,
235                                             data & PAGE_MASK, PAGE_SIZE)) {
236                                 ret = 1;
237                                 break;
238                         }
239                 synic->msg_page = data;
240                 if (!host)
241                         synic_exit(synic, msr);
242                 break;
243         case HV_X64_MSR_EOM: {
244                 int i;
245 
246                 for (i = 0; i < ARRAY_SIZE(synic->sint); i++)
247                         kvm_hv_notify_acked_sint(vcpu, i);
248                 break;
249         }
250         case HV_X64_MSR_SINT0 ... HV_X64_MSR_SINT15:
251                 ret = synic_set_sint(synic, msr - HV_X64_MSR_SINT0, data, host);
252                 break;
253         default:
254                 ret = 1;
255                 break;
256         }
257         return ret;
258 }
259 
260 static int synic_get_msr(struct kvm_vcpu_hv_synic *synic, u32 msr, u64 *pdata)
261 {
262         int ret;
263 
264         if (!synic->active)
265                 return 1;
266 
267         ret = 0;
268         switch (msr) {
269         case HV_X64_MSR_SCONTROL:
270                 *pdata = synic->control;
271                 break;
272         case HV_X64_MSR_SVERSION:
273                 *pdata = synic->version;
274                 break;
275         case HV_X64_MSR_SIEFP:
276                 *pdata = synic->evt_page;
277                 break;
278         case HV_X64_MSR_SIMP:
279                 *pdata = synic->msg_page;
280                 break;
281         case HV_X64_MSR_EOM:
282                 *pdata = 0;
283                 break;
284         case HV_X64_MSR_SINT0 ... HV_X64_MSR_SINT15:
285                 *pdata = atomic64_read(&synic->sint[msr - HV_X64_MSR_SINT0]);
286                 break;
287         default:
288                 ret = 1;
289                 break;
290         }
291         return ret;
292 }
293 
294 int synic_set_irq(struct kvm_vcpu_hv_synic *synic, u32 sint)
295 {
296         struct kvm_vcpu *vcpu = synic_to_vcpu(synic);
297         struct kvm_lapic_irq irq;
298         int ret, vector;
299 
300         if (sint >= ARRAY_SIZE(synic->sint))
301                 return -EINVAL;
302 
303         vector = synic_get_sint_vector(synic_read_sint(synic, sint));
304         if (vector < 0)
305                 return -ENOENT;
306 
307         memset(&irq, 0, sizeof(irq));
308         irq.dest_id = kvm_apic_id(vcpu->arch.apic);
309         irq.dest_mode = APIC_DEST_PHYSICAL;
310         irq.delivery_mode = APIC_DM_FIXED;
311         irq.vector = vector;
312         irq.level = 1;
313 
314         ret = kvm_irq_delivery_to_apic(vcpu->kvm, NULL, &irq, NULL);
315         trace_kvm_hv_synic_set_irq(vcpu->vcpu_id, sint, irq.vector, ret);
316         return ret;
317 }
318 
319 int kvm_hv_synic_set_irq(struct kvm *kvm, u32 vcpu_id, u32 sint)
320 {
321         struct kvm_vcpu_hv_synic *synic;
322 
323         synic = synic_get(kvm, vcpu_id);
324         if (!synic)
325                 return -EINVAL;
326 
327         return synic_set_irq(synic, sint);
328 }
329 
330 void kvm_hv_synic_send_eoi(struct kvm_vcpu *vcpu, int vector)
331 {
332         struct kvm_vcpu_hv_synic *synic = vcpu_to_synic(vcpu);
333         int i;
334 
335         trace_kvm_hv_synic_send_eoi(vcpu->vcpu_id, vector);
336 
337         for (i = 0; i < ARRAY_SIZE(synic->sint); i++)
338                 if (synic_get_sint_vector(synic_read_sint(synic, i)) == vector)
339                         kvm_hv_notify_acked_sint(vcpu, i);
340 }
341 
342 static int kvm_hv_set_sint_gsi(struct kvm *kvm, u32 vcpu_id, u32 sint, int gsi)
343 {
344         struct kvm_vcpu_hv_synic *synic;
345 
346         synic = synic_get(kvm, vcpu_id);
347         if (!synic)
348                 return -EINVAL;
349 
350         if (sint >= ARRAY_SIZE(synic->sint_to_gsi))
351                 return -EINVAL;
352 
353         atomic_set(&synic->sint_to_gsi[sint], gsi);
354         return 0;
355 }
356 
357 void kvm_hv_irq_routing_update(struct kvm *kvm)
358 {
359         struct kvm_irq_routing_table *irq_rt;
360         struct kvm_kernel_irq_routing_entry *e;
361         u32 gsi;
362 
363         irq_rt = srcu_dereference_check(kvm->irq_routing, &kvm->irq_srcu,
364                                         lockdep_is_held(&kvm->irq_lock));
365 
366         for (gsi = 0; gsi < irq_rt->nr_rt_entries; gsi++) {
367                 hlist_for_each_entry(e, &irq_rt->map[gsi], link) {
368                         if (e->type == KVM_IRQ_ROUTING_HV_SINT)
369                                 kvm_hv_set_sint_gsi(kvm, e->hv_sint.vcpu,
370                                                     e->hv_sint.sint, gsi);
371                 }
372         }
373 }
374 
375 static void synic_init(struct kvm_vcpu_hv_synic *synic)
376 {
377         int i;
378 
379         memset(synic, 0, sizeof(*synic));
380         synic->version = HV_SYNIC_VERSION_1;
381         for (i = 0; i < ARRAY_SIZE(synic->sint); i++) {
382                 atomic64_set(&synic->sint[i], HV_SYNIC_SINT_MASKED);
383                 atomic_set(&synic->sint_to_gsi[i], -1);
384         }
385 }
386 
387 static u64 get_time_ref_counter(struct kvm *kvm)
388 {
389         return div_u64(get_kernel_ns() + kvm->arch.kvmclock_offset, 100);
390 }
391 
392 static void stimer_mark_pending(struct kvm_vcpu_hv_stimer *stimer,
393                                 bool vcpu_kick)
394 {
395         struct kvm_vcpu *vcpu = stimer_to_vcpu(stimer);
396 
397         set_bit(stimer->index,
398                 vcpu_to_hv_vcpu(vcpu)->stimer_pending_bitmap);
399         kvm_make_request(KVM_REQ_HV_STIMER, vcpu);
400         if (vcpu_kick)
401                 kvm_vcpu_kick(vcpu);
402 }
403 
404 static void stimer_cleanup(struct kvm_vcpu_hv_stimer *stimer)
405 {
406         struct kvm_vcpu *vcpu = stimer_to_vcpu(stimer);
407 
408         trace_kvm_hv_stimer_cleanup(stimer_to_vcpu(stimer)->vcpu_id,
409                                     stimer->index);
410 
411         hrtimer_cancel(&stimer->timer);
412         clear_bit(stimer->index,
413                   vcpu_to_hv_vcpu(vcpu)->stimer_pending_bitmap);
414         stimer->msg_pending = false;
415         stimer->exp_time = 0;
416 }
417 
418 static enum hrtimer_restart stimer_timer_callback(struct hrtimer *timer)
419 {
420         struct kvm_vcpu_hv_stimer *stimer;
421 
422         stimer = container_of(timer, struct kvm_vcpu_hv_stimer, timer);
423         trace_kvm_hv_stimer_callback(stimer_to_vcpu(stimer)->vcpu_id,
424                                      stimer->index);
425         stimer_mark_pending(stimer, true);
426 
427         return HRTIMER_NORESTART;
428 }
429 
430 /*
431  * stimer_start() assumptions:
432  * a) stimer->count is not equal to 0
433  * b) stimer->config has HV_STIMER_ENABLE flag
434  */
435 static int stimer_start(struct kvm_vcpu_hv_stimer *stimer)
436 {
437         u64 time_now;
438         ktime_t ktime_now;
439 
440         time_now = get_time_ref_counter(stimer_to_vcpu(stimer)->kvm);
441         ktime_now = ktime_get();
442 
443         if (stimer->config & HV_STIMER_PERIODIC) {
444                 if (stimer->exp_time) {
445                         if (time_now >= stimer->exp_time) {
446                                 u64 remainder;
447 
448                                 div64_u64_rem(time_now - stimer->exp_time,
449                                               stimer->count, &remainder);
450                                 stimer->exp_time =
451                                         time_now + (stimer->count - remainder);
452                         }
453                 } else
454                         stimer->exp_time = time_now + stimer->count;
455 
456                 trace_kvm_hv_stimer_start_periodic(
457                                         stimer_to_vcpu(stimer)->vcpu_id,
458                                         stimer->index,
459                                         time_now, stimer->exp_time);
460 
461                 hrtimer_start(&stimer->timer,
462                               ktime_add_ns(ktime_now,
463                                            100 * (stimer->exp_time - time_now)),
464                               HRTIMER_MODE_ABS);
465                 return 0;
466         }
467         stimer->exp_time = stimer->count;
468         if (time_now >= stimer->count) {
469                 /*
470                  * Expire timer according to Hypervisor Top-Level Functional
471                  * specification v4(15.3.1):
472                  * "If a one shot is enabled and the specified count is in
473                  * the past, it will expire immediately."
474                  */
475                 stimer_mark_pending(stimer, false);
476                 return 0;
477         }
478 
479         trace_kvm_hv_stimer_start_one_shot(stimer_to_vcpu(stimer)->vcpu_id,
480                                            stimer->index,
481                                            time_now, stimer->count);
482 
483         hrtimer_start(&stimer->timer,
484                       ktime_add_ns(ktime_now, 100 * (stimer->count - time_now)),
485                       HRTIMER_MODE_ABS);
486         return 0;
487 }
488 
489 static int stimer_set_config(struct kvm_vcpu_hv_stimer *stimer, u64 config,
490                              bool host)
491 {
492         trace_kvm_hv_stimer_set_config(stimer_to_vcpu(stimer)->vcpu_id,
493                                        stimer->index, config, host);
494 
495         stimer_cleanup(stimer);
496         if ((stimer->config & HV_STIMER_ENABLE) && HV_STIMER_SINT(config) == 0)
497                 config &= ~HV_STIMER_ENABLE;
498         stimer->config = config;
499         stimer_mark_pending(stimer, false);
500         return 0;
501 }
502 
503 static int stimer_set_count(struct kvm_vcpu_hv_stimer *stimer, u64 count,
504                             bool host)
505 {
506         trace_kvm_hv_stimer_set_count(stimer_to_vcpu(stimer)->vcpu_id,
507                                       stimer->index, count, host);
508 
509         stimer_cleanup(stimer);
510         stimer->count = count;
511         if (stimer->count == 0)
512                 stimer->config &= ~HV_STIMER_ENABLE;
513         else if (stimer->config & HV_STIMER_AUTOENABLE)
514                 stimer->config |= HV_STIMER_ENABLE;
515         stimer_mark_pending(stimer, false);
516         return 0;
517 }
518 
519 static int stimer_get_config(struct kvm_vcpu_hv_stimer *stimer, u64 *pconfig)
520 {
521         *pconfig = stimer->config;
522         return 0;
523 }
524 
525 static int stimer_get_count(struct kvm_vcpu_hv_stimer *stimer, u64 *pcount)
526 {
527         *pcount = stimer->count;
528         return 0;
529 }
530 
531 static int synic_deliver_msg(struct kvm_vcpu_hv_synic *synic, u32 sint,
532                              struct hv_message *src_msg)
533 {
534         struct kvm_vcpu *vcpu = synic_to_vcpu(synic);
535         struct page *page;
536         gpa_t gpa;
537         struct hv_message *dst_msg;
538         int r;
539         struct hv_message_page *msg_page;
540 
541         if (!(synic->msg_page & HV_SYNIC_SIMP_ENABLE))
542                 return -ENOENT;
543 
544         gpa = synic->msg_page & PAGE_MASK;
545         page = kvm_vcpu_gfn_to_page(vcpu, gpa >> PAGE_SHIFT);
546         if (is_error_page(page))
547                 return -EFAULT;
548 
549         msg_page = kmap_atomic(page);
550         dst_msg = &msg_page->sint_message[sint];
551         if (sync_cmpxchg(&dst_msg->header.message_type, HVMSG_NONE,
552                          src_msg->header.message_type) != HVMSG_NONE) {
553                 dst_msg->header.message_flags.msg_pending = 1;
554                 r = -EAGAIN;
555         } else {
556                 memcpy(&dst_msg->u.payload, &src_msg->u.payload,
557                        src_msg->header.payload_size);
558                 dst_msg->header.message_type = src_msg->header.message_type;
559                 dst_msg->header.payload_size = src_msg->header.payload_size;
560                 r = synic_set_irq(synic, sint);
561                 if (r >= 1)
562                         r = 0;
563                 else if (r == 0)
564                         r = -EFAULT;
565         }
566         kunmap_atomic(msg_page);
567         kvm_release_page_dirty(page);
568         kvm_vcpu_mark_page_dirty(vcpu, gpa >> PAGE_SHIFT);
569         return r;
570 }
571 
572 static int stimer_send_msg(struct kvm_vcpu_hv_stimer *stimer)
573 {
574         struct kvm_vcpu *vcpu = stimer_to_vcpu(stimer);
575         struct hv_message *msg = &stimer->msg;
576         struct hv_timer_message_payload *payload =
577                         (struct hv_timer_message_payload *)&msg->u.payload;
578 
579         payload->expiration_time = stimer->exp_time;
580         payload->delivery_time = get_time_ref_counter(vcpu->kvm);
581         return synic_deliver_msg(vcpu_to_synic(vcpu),
582                                  HV_STIMER_SINT(stimer->config), msg);
583 }
584 
585 static void stimer_expiration(struct kvm_vcpu_hv_stimer *stimer)
586 {
587         int r;
588 
589         stimer->msg_pending = true;
590         r = stimer_send_msg(stimer);
591         trace_kvm_hv_stimer_expiration(stimer_to_vcpu(stimer)->vcpu_id,
592                                        stimer->index, r);
593         if (!r) {
594                 stimer->msg_pending = false;
595                 if (!(stimer->config & HV_STIMER_PERIODIC))
596                         stimer->config &= ~HV_STIMER_ENABLE;
597         }
598 }
599 
600 void kvm_hv_process_stimers(struct kvm_vcpu *vcpu)
601 {
602         struct kvm_vcpu_hv *hv_vcpu = vcpu_to_hv_vcpu(vcpu);
603         struct kvm_vcpu_hv_stimer *stimer;
604         u64 time_now, exp_time;
605         int i;
606 
607         for (i = 0; i < ARRAY_SIZE(hv_vcpu->stimer); i++)
608                 if (test_and_clear_bit(i, hv_vcpu->stimer_pending_bitmap)) {
609                         stimer = &hv_vcpu->stimer[i];
610                         if (stimer->config & HV_STIMER_ENABLE) {
611                                 exp_time = stimer->exp_time;
612 
613                                 if (exp_time) {
614                                         time_now =
615                                                 get_time_ref_counter(vcpu->kvm);
616                                         if (time_now >= exp_time)
617                                                 stimer_expiration(stimer);
618                                 }
619 
620                                 if ((stimer->config & HV_STIMER_ENABLE) &&
621                                     stimer->count)
622                                         stimer_start(stimer);
623                                 else
624                                         stimer_cleanup(stimer);
625                         }
626                 }
627 }
628 
629 void kvm_hv_vcpu_uninit(struct kvm_vcpu *vcpu)
630 {
631         struct kvm_vcpu_hv *hv_vcpu = vcpu_to_hv_vcpu(vcpu);
632         int i;
633 
634         for (i = 0; i < ARRAY_SIZE(hv_vcpu->stimer); i++)
635                 stimer_cleanup(&hv_vcpu->stimer[i]);
636 }
637 
638 static void stimer_prepare_msg(struct kvm_vcpu_hv_stimer *stimer)
639 {
640         struct hv_message *msg = &stimer->msg;
641         struct hv_timer_message_payload *payload =
642                         (struct hv_timer_message_payload *)&msg->u.payload;
643 
644         memset(&msg->header, 0, sizeof(msg->header));
645         msg->header.message_type = HVMSG_TIMER_EXPIRED;
646         msg->header.payload_size = sizeof(*payload);
647 
648         payload->timer_index = stimer->index;
649         payload->expiration_time = 0;
650         payload->delivery_time = 0;
651 }
652 
653 static void stimer_init(struct kvm_vcpu_hv_stimer *stimer, int timer_index)
654 {
655         memset(stimer, 0, sizeof(*stimer));
656         stimer->index = timer_index;
657         hrtimer_init(&stimer->timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
658         stimer->timer.function = stimer_timer_callback;
659         stimer_prepare_msg(stimer);
660 }
661 
662 void kvm_hv_vcpu_init(struct kvm_vcpu *vcpu)
663 {
664         struct kvm_vcpu_hv *hv_vcpu = vcpu_to_hv_vcpu(vcpu);
665         int i;
666 
667         synic_init(&hv_vcpu->synic);
668 
669         bitmap_zero(hv_vcpu->stimer_pending_bitmap, HV_SYNIC_STIMER_COUNT);
670         for (i = 0; i < ARRAY_SIZE(hv_vcpu->stimer); i++)
671                 stimer_init(&hv_vcpu->stimer[i], i);
672 }
673 
674 int kvm_hv_activate_synic(struct kvm_vcpu *vcpu)
675 {
676         /*
677          * Hyper-V SynIC auto EOI SINT's are
678          * not compatible with APICV, so deactivate APICV
679          */
680         kvm_vcpu_deactivate_apicv(vcpu);
681         vcpu_to_synic(vcpu)->active = true;
682         return 0;
683 }
684 
685 static bool kvm_hv_msr_partition_wide(u32 msr)
686 {
687         bool r = false;
688 
689         switch (msr) {
690         case HV_X64_MSR_GUEST_OS_ID:
691         case HV_X64_MSR_HYPERCALL:
692         case HV_X64_MSR_REFERENCE_TSC:
693         case HV_X64_MSR_TIME_REF_COUNT:
694         case HV_X64_MSR_CRASH_CTL:
695         case HV_X64_MSR_CRASH_P0 ... HV_X64_MSR_CRASH_P4:
696         case HV_X64_MSR_RESET:
697                 r = true;
698                 break;
699         }
700 
701         return r;
702 }
703 
704 static int kvm_hv_msr_get_crash_data(struct kvm_vcpu *vcpu,
705                                      u32 index, u64 *pdata)
706 {
707         struct kvm_hv *hv = &vcpu->kvm->arch.hyperv;
708 
709         if (WARN_ON_ONCE(index >= ARRAY_SIZE(hv->hv_crash_param)))
710                 return -EINVAL;
711 
712         *pdata = hv->hv_crash_param[index];
713         return 0;
714 }
715 
716 static int kvm_hv_msr_get_crash_ctl(struct kvm_vcpu *vcpu, u64 *pdata)
717 {
718         struct kvm_hv *hv = &vcpu->kvm->arch.hyperv;
719 
720         *pdata = hv->hv_crash_ctl;
721         return 0;
722 }
723 
724 static int kvm_hv_msr_set_crash_ctl(struct kvm_vcpu *vcpu, u64 data, bool host)
725 {
726         struct kvm_hv *hv = &vcpu->kvm->arch.hyperv;
727 
728         if (host)
729                 hv->hv_crash_ctl = data & HV_X64_MSR_CRASH_CTL_NOTIFY;
730 
731         if (!host && (data & HV_X64_MSR_CRASH_CTL_NOTIFY)) {
732 
733                 vcpu_debug(vcpu, "hv crash (0x%llx 0x%llx 0x%llx 0x%llx 0x%llx)\n",
734                           hv->hv_crash_param[0],
735                           hv->hv_crash_param[1],
736                           hv->hv_crash_param[2],
737                           hv->hv_crash_param[3],
738                           hv->hv_crash_param[4]);
739 
740                 /* Send notification about crash to user space */
741                 kvm_make_request(KVM_REQ_HV_CRASH, vcpu);
742         }
743 
744         return 0;
745 }
746 
747 static int kvm_hv_msr_set_crash_data(struct kvm_vcpu *vcpu,
748                                      u32 index, u64 data)
749 {
750         struct kvm_hv *hv = &vcpu->kvm->arch.hyperv;
751 
752         if (WARN_ON_ONCE(index >= ARRAY_SIZE(hv->hv_crash_param)))
753                 return -EINVAL;
754 
755         hv->hv_crash_param[index] = data;
756         return 0;
757 }
758 
759 static int kvm_hv_set_msr_pw(struct kvm_vcpu *vcpu, u32 msr, u64 data,
760                              bool host)
761 {
762         struct kvm *kvm = vcpu->kvm;
763         struct kvm_hv *hv = &kvm->arch.hyperv;
764 
765         switch (msr) {
766         case HV_X64_MSR_GUEST_OS_ID:
767                 hv->hv_guest_os_id = data;
768                 /* setting guest os id to zero disables hypercall page */
769                 if (!hv->hv_guest_os_id)
770                         hv->hv_hypercall &= ~HV_X64_MSR_HYPERCALL_ENABLE;
771                 break;
772         case HV_X64_MSR_HYPERCALL: {
773                 u64 gfn;
774                 unsigned long addr;
775                 u8 instructions[4];
776 
777                 /* if guest os id is not set hypercall should remain disabled */
778                 if (!hv->hv_guest_os_id)
779                         break;
780                 if (!(data & HV_X64_MSR_HYPERCALL_ENABLE)) {
781                         hv->hv_hypercall = data;
782                         break;
783                 }
784                 gfn = data >> HV_X64_MSR_HYPERCALL_PAGE_ADDRESS_SHIFT;
785                 addr = gfn_to_hva(kvm, gfn);
786                 if (kvm_is_error_hva(addr))
787                         return 1;
788                 kvm_x86_ops->patch_hypercall(vcpu, instructions);
789                 ((unsigned char *)instructions)[3] = 0xc3; /* ret */
790                 if (__copy_to_user((void __user *)addr, instructions, 4))
791                         return 1;
792                 hv->hv_hypercall = data;
793                 mark_page_dirty(kvm, gfn);
794                 break;
795         }
796         case HV_X64_MSR_REFERENCE_TSC: {
797                 u64 gfn;
798                 HV_REFERENCE_TSC_PAGE tsc_ref;
799 
800                 memset(&tsc_ref, 0, sizeof(tsc_ref));
801                 hv->hv_tsc_page = data;
802                 if (!(data & HV_X64_MSR_TSC_REFERENCE_ENABLE))
803                         break;
804                 gfn = data >> HV_X64_MSR_TSC_REFERENCE_ADDRESS_SHIFT;
805                 if (kvm_write_guest(
806                                 kvm,
807                                 gfn << HV_X64_MSR_TSC_REFERENCE_ADDRESS_SHIFT,
808                                 &tsc_ref, sizeof(tsc_ref)))
809                         return 1;
810                 mark_page_dirty(kvm, gfn);
811                 break;
812         }
813         case HV_X64_MSR_CRASH_P0 ... HV_X64_MSR_CRASH_P4:
814                 return kvm_hv_msr_set_crash_data(vcpu,
815                                                  msr - HV_X64_MSR_CRASH_P0,
816                                                  data);
817         case HV_X64_MSR_CRASH_CTL:
818                 return kvm_hv_msr_set_crash_ctl(vcpu, data, host);
819         case HV_X64_MSR_RESET:
820                 if (data == 1) {
821                         vcpu_debug(vcpu, "hyper-v reset requested\n");
822                         kvm_make_request(KVM_REQ_HV_RESET, vcpu);
823                 }
824                 break;
825         default:
826                 vcpu_unimpl(vcpu, "Hyper-V uhandled wrmsr: 0x%x data 0x%llx\n",
827                             msr, data);
828                 return 1;
829         }
830         return 0;
831 }
832 
833 /* Calculate cpu time spent by current task in 100ns units */
834 static u64 current_task_runtime_100ns(void)
835 {
836         cputime_t utime, stime;
837 
838         task_cputime_adjusted(current, &utime, &stime);
839         return div_u64(cputime_to_nsecs(utime + stime), 100);
840 }
841 
842 static int kvm_hv_set_msr(struct kvm_vcpu *vcpu, u32 msr, u64 data, bool host)
843 {
844         struct kvm_vcpu_hv *hv = &vcpu->arch.hyperv;
845 
846         switch (msr) {
847         case HV_X64_MSR_APIC_ASSIST_PAGE: {
848                 u64 gfn;
849                 unsigned long addr;
850 
851                 if (!(data & HV_X64_MSR_APIC_ASSIST_PAGE_ENABLE)) {
852                         hv->hv_vapic = data;
853                         if (kvm_lapic_enable_pv_eoi(vcpu, 0))
854                                 return 1;
855                         break;
856                 }
857                 gfn = data >> HV_X64_MSR_APIC_ASSIST_PAGE_ADDRESS_SHIFT;
858                 addr = kvm_vcpu_gfn_to_hva(vcpu, gfn);
859                 if (kvm_is_error_hva(addr))
860                         return 1;
861                 if (__clear_user((void __user *)addr, PAGE_SIZE))
862                         return 1;
863                 hv->hv_vapic = data;
864                 kvm_vcpu_mark_page_dirty(vcpu, gfn);
865                 if (kvm_lapic_enable_pv_eoi(vcpu,
866                                             gfn_to_gpa(gfn) | KVM_MSR_ENABLED))
867                         return 1;
868                 break;
869         }
870         case HV_X64_MSR_EOI:
871                 return kvm_hv_vapic_msr_write(vcpu, APIC_EOI, data);
872         case HV_X64_MSR_ICR:
873                 return kvm_hv_vapic_msr_write(vcpu, APIC_ICR, data);
874         case HV_X64_MSR_TPR:
875                 return kvm_hv_vapic_msr_write(vcpu, APIC_TASKPRI, data);
876         case HV_X64_MSR_VP_RUNTIME:
877                 if (!host)
878                         return 1;
879                 hv->runtime_offset = data - current_task_runtime_100ns();
880                 break;
881         case HV_X64_MSR_SCONTROL:
882         case HV_X64_MSR_SVERSION:
883         case HV_X64_MSR_SIEFP:
884         case HV_X64_MSR_SIMP:
885         case HV_X64_MSR_EOM:
886         case HV_X64_MSR_SINT0 ... HV_X64_MSR_SINT15:
887                 return synic_set_msr(vcpu_to_synic(vcpu), msr, data, host);
888         case HV_X64_MSR_STIMER0_CONFIG:
889         case HV_X64_MSR_STIMER1_CONFIG:
890         case HV_X64_MSR_STIMER2_CONFIG:
891         case HV_X64_MSR_STIMER3_CONFIG: {
892                 int timer_index = (msr - HV_X64_MSR_STIMER0_CONFIG)/2;
893 
894                 return stimer_set_config(vcpu_to_stimer(vcpu, timer_index),
895                                          data, host);
896         }
897         case HV_X64_MSR_STIMER0_COUNT:
898         case HV_X64_MSR_STIMER1_COUNT:
899         case HV_X64_MSR_STIMER2_COUNT:
900         case HV_X64_MSR_STIMER3_COUNT: {
901                 int timer_index = (msr - HV_X64_MSR_STIMER0_COUNT)/2;
902 
903                 return stimer_set_count(vcpu_to_stimer(vcpu, timer_index),
904                                         data, host);
905         }
906         default:
907                 vcpu_unimpl(vcpu, "Hyper-V uhandled wrmsr: 0x%x data 0x%llx\n",
908                             msr, data);
909                 return 1;
910         }
911 
912         return 0;
913 }
914 
915 static int kvm_hv_get_msr_pw(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
916 {
917         u64 data = 0;
918         struct kvm *kvm = vcpu->kvm;
919         struct kvm_hv *hv = &kvm->arch.hyperv;
920 
921         switch (msr) {
922         case HV_X64_MSR_GUEST_OS_ID:
923                 data = hv->hv_guest_os_id;
924                 break;
925         case HV_X64_MSR_HYPERCALL:
926                 data = hv->hv_hypercall;
927                 break;
928         case HV_X64_MSR_TIME_REF_COUNT:
929                 data = get_time_ref_counter(kvm);
930                 break;
931         case HV_X64_MSR_REFERENCE_TSC:
932                 data = hv->hv_tsc_page;
933                 break;
934         case HV_X64_MSR_CRASH_P0 ... HV_X64_MSR_CRASH_P4:
935                 return kvm_hv_msr_get_crash_data(vcpu,
936                                                  msr - HV_X64_MSR_CRASH_P0,
937                                                  pdata);
938         case HV_X64_MSR_CRASH_CTL:
939                 return kvm_hv_msr_get_crash_ctl(vcpu, pdata);
940         case HV_X64_MSR_RESET:
941                 data = 0;
942                 break;
943         default:
944                 vcpu_unimpl(vcpu, "Hyper-V unhandled rdmsr: 0x%x\n", msr);
945                 return 1;
946         }
947 
948         *pdata = data;
949         return 0;
950 }
951 
952 static int kvm_hv_get_msr(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
953 {
954         u64 data = 0;
955         struct kvm_vcpu_hv *hv = &vcpu->arch.hyperv;
956 
957         switch (msr) {
958         case HV_X64_MSR_VP_INDEX: {
959                 int r;
960                 struct kvm_vcpu *v;
961 
962                 kvm_for_each_vcpu(r, v, vcpu->kvm) {
963                         if (v == vcpu) {
964                                 data = r;
965                                 break;
966                         }
967                 }
968                 break;
969         }
970         case HV_X64_MSR_EOI:
971                 return kvm_hv_vapic_msr_read(vcpu, APIC_EOI, pdata);
972         case HV_X64_MSR_ICR:
973                 return kvm_hv_vapic_msr_read(vcpu, APIC_ICR, pdata);
974         case HV_X64_MSR_TPR:
975                 return kvm_hv_vapic_msr_read(vcpu, APIC_TASKPRI, pdata);
976         case HV_X64_MSR_APIC_ASSIST_PAGE:
977                 data = hv->hv_vapic;
978                 break;
979         case HV_X64_MSR_VP_RUNTIME:
980                 data = current_task_runtime_100ns() + hv->runtime_offset;
981                 break;
982         case HV_X64_MSR_SCONTROL:
983         case HV_X64_MSR_SVERSION:
984         case HV_X64_MSR_SIEFP:
985         case HV_X64_MSR_SIMP:
986         case HV_X64_MSR_EOM:
987         case HV_X64_MSR_SINT0 ... HV_X64_MSR_SINT15:
988                 return synic_get_msr(vcpu_to_synic(vcpu), msr, pdata);
989         case HV_X64_MSR_STIMER0_CONFIG:
990         case HV_X64_MSR_STIMER1_CONFIG:
991         case HV_X64_MSR_STIMER2_CONFIG:
992         case HV_X64_MSR_STIMER3_CONFIG: {
993                 int timer_index = (msr - HV_X64_MSR_STIMER0_CONFIG)/2;
994 
995                 return stimer_get_config(vcpu_to_stimer(vcpu, timer_index),
996                                          pdata);
997         }
998         case HV_X64_MSR_STIMER0_COUNT:
999         case HV_X64_MSR_STIMER1_COUNT:
1000         case HV_X64_MSR_STIMER2_COUNT:
1001         case HV_X64_MSR_STIMER3_COUNT: {
1002                 int timer_index = (msr - HV_X64_MSR_STIMER0_COUNT)/2;
1003 
1004                 return stimer_get_count(vcpu_to_stimer(vcpu, timer_index),
1005                                         pdata);
1006         }
1007         default:
1008                 vcpu_unimpl(vcpu, "Hyper-V unhandled rdmsr: 0x%x\n", msr);
1009                 return 1;
1010         }
1011         *pdata = data;
1012         return 0;
1013 }
1014 
1015 int kvm_hv_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data, bool host)
1016 {
1017         if (kvm_hv_msr_partition_wide(msr)) {
1018                 int r;
1019 
1020                 mutex_lock(&vcpu->kvm->lock);
1021                 r = kvm_hv_set_msr_pw(vcpu, msr, data, host);
1022                 mutex_unlock(&vcpu->kvm->lock);
1023                 return r;
1024         } else
1025                 return kvm_hv_set_msr(vcpu, msr, data, host);
1026 }
1027 
1028 int kvm_hv_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1029 {
1030         if (kvm_hv_msr_partition_wide(msr)) {
1031                 int r;
1032 
1033                 mutex_lock(&vcpu->kvm->lock);
1034                 r = kvm_hv_get_msr_pw(vcpu, msr, pdata);
1035                 mutex_unlock(&vcpu->kvm->lock);
1036                 return r;
1037         } else
1038                 return kvm_hv_get_msr(vcpu, msr, pdata);
1039 }
1040 
1041 bool kvm_hv_hypercall_enabled(struct kvm *kvm)
1042 {
1043         return kvm->arch.hyperv.hv_hypercall & HV_X64_MSR_HYPERCALL_ENABLE;
1044 }
1045 
1046 static void kvm_hv_hypercall_set_result(struct kvm_vcpu *vcpu, u64 result)
1047 {
1048         bool longmode;
1049 
1050         longmode = is_64_bit_mode(vcpu);
1051         if (longmode)
1052                 kvm_register_write(vcpu, VCPU_REGS_RAX, result);
1053         else {
1054                 kvm_register_write(vcpu, VCPU_REGS_RDX, result >> 32);
1055                 kvm_register_write(vcpu, VCPU_REGS_RAX, result & 0xffffffff);
1056         }
1057 }
1058 
1059 static int kvm_hv_hypercall_complete_userspace(struct kvm_vcpu *vcpu)
1060 {
1061         struct kvm_run *run = vcpu->run;
1062 
1063         kvm_hv_hypercall_set_result(vcpu, run->hyperv.u.hcall.result);
1064         return 1;
1065 }
1066 
1067 int kvm_hv_hypercall(struct kvm_vcpu *vcpu)
1068 {
1069         u64 param, ingpa, outgpa, ret;
1070         uint16_t code, rep_idx, rep_cnt, res = HV_STATUS_SUCCESS, rep_done = 0;
1071         bool fast, longmode;
1072 
1073         /*
1074          * hypercall generates UD from non zero cpl and real mode
1075          * per HYPER-V spec
1076          */
1077         if (kvm_x86_ops->get_cpl(vcpu) != 0 || !is_protmode(vcpu)) {
1078                 kvm_queue_exception(vcpu, UD_VECTOR);
1079                 return 1;
1080         }
1081 
1082         longmode = is_64_bit_mode(vcpu);
1083 
1084         if (!longmode) {
1085                 param = ((u64)kvm_register_read(vcpu, VCPU_REGS_RDX) << 32) |
1086                         (kvm_register_read(vcpu, VCPU_REGS_RAX) & 0xffffffff);
1087                 ingpa = ((u64)kvm_register_read(vcpu, VCPU_REGS_RBX) << 32) |
1088                         (kvm_register_read(vcpu, VCPU_REGS_RCX) & 0xffffffff);
1089                 outgpa = ((u64)kvm_register_read(vcpu, VCPU_REGS_RDI) << 32) |
1090                         (kvm_register_read(vcpu, VCPU_REGS_RSI) & 0xffffffff);
1091         }
1092 #ifdef CONFIG_X86_64
1093         else {
1094                 param = kvm_register_read(vcpu, VCPU_REGS_RCX);
1095                 ingpa = kvm_register_read(vcpu, VCPU_REGS_RDX);
1096                 outgpa = kvm_register_read(vcpu, VCPU_REGS_R8);
1097         }
1098 #endif
1099 
1100         code = param & 0xffff;
1101         fast = (param >> 16) & 0x1;
1102         rep_cnt = (param >> 32) & 0xfff;
1103         rep_idx = (param >> 48) & 0xfff;
1104 
1105         trace_kvm_hv_hypercall(code, fast, rep_cnt, rep_idx, ingpa, outgpa);
1106 
1107         /* Hypercall continuation is not supported yet */
1108         if (rep_cnt || rep_idx) {
1109                 res = HV_STATUS_INVALID_HYPERCALL_CODE;
1110                 goto set_result;
1111         }
1112 
1113         switch (code) {
1114         case HVCALL_NOTIFY_LONG_SPIN_WAIT:
1115                 kvm_vcpu_on_spin(vcpu);
1116                 break;
1117         case HVCALL_POST_MESSAGE:
1118         case HVCALL_SIGNAL_EVENT:
1119                 /* don't bother userspace if it has no way to handle it */
1120                 if (!vcpu_to_synic(vcpu)->active) {
1121                         res = HV_STATUS_INVALID_HYPERCALL_CODE;
1122                         break;
1123                 }
1124                 vcpu->run->exit_reason = KVM_EXIT_HYPERV;
1125                 vcpu->run->hyperv.type = KVM_EXIT_HYPERV_HCALL;
1126                 vcpu->run->hyperv.u.hcall.input = param;
1127                 vcpu->run->hyperv.u.hcall.params[0] = ingpa;
1128                 vcpu->run->hyperv.u.hcall.params[1] = outgpa;
1129                 vcpu->arch.complete_userspace_io =
1130                                 kvm_hv_hypercall_complete_userspace;
1131                 return 0;
1132         default:
1133                 res = HV_STATUS_INVALID_HYPERCALL_CODE;
1134                 break;
1135         }
1136 
1137 set_result:
1138         ret = res | (((u64)rep_done & 0xfff) << 32);
1139         kvm_hv_hypercall_set_result(vcpu, ret);
1140         return 1;
1141 }
1142 

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