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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 <linux/sched/cputime.h>
32#include <linux/eventfd.h>
33
34#include <asm/apicdef.h>
35#include <trace/events/kvm.h>
36
37#include "trace.h"
38
39static inline u64 synic_read_sint(struct kvm_vcpu_hv_synic *synic, int sint)
40{
41 return atomic64_read(&synic->sint[sint]);
42}
43
44static inline int synic_get_sint_vector(u64 sint_value)
45{
46 if (sint_value & HV_SYNIC_SINT_MASKED)
47 return -1;
48 return sint_value & HV_SYNIC_SINT_VECTOR_MASK;
49}
50
51static bool synic_has_vector_connected(struct kvm_vcpu_hv_synic *synic,
52 int vector)
53{
54 int i;
55
56 for (i = 0; i < ARRAY_SIZE(synic->sint); i++) {
57 if (synic_get_sint_vector(synic_read_sint(synic, i)) == vector)
58 return true;
59 }
60 return false;
61}
62
63static bool synic_has_vector_auto_eoi(struct kvm_vcpu_hv_synic *synic,
64 int vector)
65{
66 int i;
67 u64 sint_value;
68
69 for (i = 0; i < ARRAY_SIZE(synic->sint); i++) {
70 sint_value = synic_read_sint(synic, i);
71 if (synic_get_sint_vector(sint_value) == vector &&
72 sint_value & HV_SYNIC_SINT_AUTO_EOI)
73 return true;
74 }
75 return false;
76}
77
78static void synic_update_vector(struct kvm_vcpu_hv_synic *synic,
79 int vector)
80{
81 if (vector < HV_SYNIC_FIRST_VALID_VECTOR)
82 return;
83
84 if (synic_has_vector_connected(synic, vector))
85 __set_bit(vector, synic->vec_bitmap);
86 else
87 __clear_bit(vector, synic->vec_bitmap);
88
89 if (synic_has_vector_auto_eoi(synic, vector))
90 __set_bit(vector, synic->auto_eoi_bitmap);
91 else
92 __clear_bit(vector, synic->auto_eoi_bitmap);
93}
94
95static int synic_set_sint(struct kvm_vcpu_hv_synic *synic, int sint,
96 u64 data, bool host)
97{
98 int vector, old_vector;
99 bool masked;
100
101 vector = data & HV_SYNIC_SINT_VECTOR_MASK;
102 masked = data & HV_SYNIC_SINT_MASKED;
103
104 /*
105 * Valid vectors are 16-255, however, nested Hyper-V attempts to write
106 * default '0x10000' value on boot and this should not #GP. We need to
107 * allow zero-initing the register from host as well.
108 */
109 if (vector < HV_SYNIC_FIRST_VALID_VECTOR && !host && !masked)
110 return 1;
111 /*
112 * Guest may configure multiple SINTs to use the same vector, so
113 * we maintain a bitmap of vectors handled by synic, and a
114 * bitmap of vectors with auto-eoi behavior. The bitmaps are
115 * updated here, and atomically queried on fast paths.
116 */
117 old_vector = synic_read_sint(synic, sint) & HV_SYNIC_SINT_VECTOR_MASK;
118
119 atomic64_set(&synic->sint[sint], data);
120
121 synic_update_vector(synic, old_vector);
122
123 synic_update_vector(synic, vector);
124
125 /* Load SynIC vectors into EOI exit bitmap */
126 kvm_make_request(KVM_REQ_SCAN_IOAPIC, synic_to_vcpu(synic));
127 return 0;
128}
129
130static struct kvm_vcpu *get_vcpu_by_vpidx(struct kvm *kvm, u32 vpidx)
131{
132 struct kvm_vcpu *vcpu = NULL;
133 int i;
134
135 if (vpidx < KVM_MAX_VCPUS)
136 vcpu = kvm_get_vcpu(kvm, vpidx);
137 if (vcpu && vcpu_to_hv_vcpu(vcpu)->vp_index == vpidx)
138 return vcpu;
139 kvm_for_each_vcpu(i, vcpu, kvm)
140 if (vcpu_to_hv_vcpu(vcpu)->vp_index == vpidx)
141 return vcpu;
142 return NULL;
143}
144
145static struct kvm_vcpu_hv_synic *synic_get(struct kvm *kvm, u32 vpidx)
146{
147 struct kvm_vcpu *vcpu;
148 struct kvm_vcpu_hv_synic *synic;
149
150 vcpu = get_vcpu_by_vpidx(kvm, vpidx);
151 if (!vcpu)
152 return NULL;
153 synic = vcpu_to_synic(vcpu);
154 return (synic->active) ? synic : NULL;
155}
156
157static void synic_clear_sint_msg_pending(struct kvm_vcpu_hv_synic *synic,
158 u32 sint)
159{
160 struct kvm_vcpu *vcpu = synic_to_vcpu(synic);
161 struct page *page;
162 gpa_t gpa;
163 struct hv_message *msg;
164 struct hv_message_page *msg_page;
165
166 gpa = synic->msg_page & PAGE_MASK;
167 page = kvm_vcpu_gfn_to_page(vcpu, gpa >> PAGE_SHIFT);
168 if (is_error_page(page)) {
169 vcpu_err(vcpu, "Hyper-V SynIC can't get msg page, gpa 0x%llx\n",
170 gpa);
171 return;
172 }
173 msg_page = kmap_atomic(page);
174
175 msg = &msg_page->sint_message[sint];
176 msg->header.message_flags.msg_pending = 0;
177
178 kunmap_atomic(msg_page);
179 kvm_release_page_dirty(page);
180 kvm_vcpu_mark_page_dirty(vcpu, gpa >> PAGE_SHIFT);
181}
182
183static void kvm_hv_notify_acked_sint(struct kvm_vcpu *vcpu, u32 sint)
184{
185 struct kvm *kvm = vcpu->kvm;
186 struct kvm_vcpu_hv_synic *synic = vcpu_to_synic(vcpu);
187 struct kvm_vcpu_hv *hv_vcpu = vcpu_to_hv_vcpu(vcpu);
188 struct kvm_vcpu_hv_stimer *stimer;
189 int gsi, idx, stimers_pending;
190
191 trace_kvm_hv_notify_acked_sint(vcpu->vcpu_id, sint);
192
193 if (synic->msg_page & HV_SYNIC_SIMP_ENABLE)
194 synic_clear_sint_msg_pending(synic, sint);
195
196 /* Try to deliver pending Hyper-V SynIC timers messages */
197 stimers_pending = 0;
198 for (idx = 0; idx < ARRAY_SIZE(hv_vcpu->stimer); idx++) {
199 stimer = &hv_vcpu->stimer[idx];
200 if (stimer->msg_pending &&
201 (stimer->config & HV_STIMER_ENABLE) &&
202 HV_STIMER_SINT(stimer->config) == sint) {
203 set_bit(stimer->index,
204 hv_vcpu->stimer_pending_bitmap);
205 stimers_pending++;
206 }
207 }
208 if (stimers_pending)
209 kvm_make_request(KVM_REQ_HV_STIMER, vcpu);
210
211 idx = srcu_read_lock(&kvm->irq_srcu);
212 gsi = atomic_read(&synic->sint_to_gsi[sint]);
213 if (gsi != -1)
214 kvm_notify_acked_gsi(kvm, gsi);
215 srcu_read_unlock(&kvm->irq_srcu, idx);
216}
217
218static void synic_exit(struct kvm_vcpu_hv_synic *synic, u32 msr)
219{
220 struct kvm_vcpu *vcpu = synic_to_vcpu(synic);
221 struct kvm_vcpu_hv *hv_vcpu = &vcpu->arch.hyperv;
222
223 hv_vcpu->exit.type = KVM_EXIT_HYPERV_SYNIC;
224 hv_vcpu->exit.u.synic.msr = msr;
225 hv_vcpu->exit.u.synic.control = synic->control;
226 hv_vcpu->exit.u.synic.evt_page = synic->evt_page;
227 hv_vcpu->exit.u.synic.msg_page = synic->msg_page;
228
229 kvm_make_request(KVM_REQ_HV_EXIT, vcpu);
230}
231
232static int synic_set_msr(struct kvm_vcpu_hv_synic *synic,
233 u32 msr, u64 data, bool host)
234{
235 struct kvm_vcpu *vcpu = synic_to_vcpu(synic);
236 int ret;
237
238 if (!synic->active)
239 return 1;
240
241 trace_kvm_hv_synic_set_msr(vcpu->vcpu_id, msr, data, host);
242
243 ret = 0;
244 switch (msr) {
245 case HV_X64_MSR_SCONTROL:
246 synic->control = data;
247 if (!host)
248 synic_exit(synic, msr);
249 break;
250 case HV_X64_MSR_SVERSION:
251 if (!host) {
252 ret = 1;
253 break;
254 }
255 synic->version = data;
256 break;
257 case HV_X64_MSR_SIEFP:
258 if ((data & HV_SYNIC_SIEFP_ENABLE) && !host &&
259 !synic->dont_zero_synic_pages)
260 if (kvm_clear_guest(vcpu->kvm,
261 data & PAGE_MASK, PAGE_SIZE)) {
262 ret = 1;
263 break;
264 }
265 synic->evt_page = data;
266 if (!host)
267 synic_exit(synic, msr);
268 break;
269 case HV_X64_MSR_SIMP:
270 if ((data & HV_SYNIC_SIMP_ENABLE) && !host &&
271 !synic->dont_zero_synic_pages)
272 if (kvm_clear_guest(vcpu->kvm,
273 data & PAGE_MASK, PAGE_SIZE)) {
274 ret = 1;
275 break;
276 }
277 synic->msg_page = data;
278 if (!host)
279 synic_exit(synic, msr);
280 break;
281 case HV_X64_MSR_EOM: {
282 int i;
283
284 for (i = 0; i < ARRAY_SIZE(synic->sint); i++)
285 kvm_hv_notify_acked_sint(vcpu, i);
286 break;
287 }
288 case HV_X64_MSR_SINT0 ... HV_X64_MSR_SINT15:
289 ret = synic_set_sint(synic, msr - HV_X64_MSR_SINT0, data, host);
290 break;
291 default:
292 ret = 1;
293 break;
294 }
295 return ret;
296}
297
298static int synic_get_msr(struct kvm_vcpu_hv_synic *synic, u32 msr, u64 *pdata)
299{
300 int ret;
301
302 if (!synic->active)
303 return 1;
304
305 ret = 0;
306 switch (msr) {
307 case HV_X64_MSR_SCONTROL:
308 *pdata = synic->control;
309 break;
310 case HV_X64_MSR_SVERSION:
311 *pdata = synic->version;
312 break;
313 case HV_X64_MSR_SIEFP:
314 *pdata = synic->evt_page;
315 break;
316 case HV_X64_MSR_SIMP:
317 *pdata = synic->msg_page;
318 break;
319 case HV_X64_MSR_EOM:
320 *pdata = 0;
321 break;
322 case HV_X64_MSR_SINT0 ... HV_X64_MSR_SINT15:
323 *pdata = atomic64_read(&synic->sint[msr - HV_X64_MSR_SINT0]);
324 break;
325 default:
326 ret = 1;
327 break;
328 }
329 return ret;
330}
331
332static int synic_set_irq(struct kvm_vcpu_hv_synic *synic, u32 sint)
333{
334 struct kvm_vcpu *vcpu = synic_to_vcpu(synic);
335 struct kvm_lapic_irq irq;
336 int ret, vector;
337
338 if (sint >= ARRAY_SIZE(synic->sint))
339 return -EINVAL;
340
341 vector = synic_get_sint_vector(synic_read_sint(synic, sint));
342 if (vector < 0)
343 return -ENOENT;
344
345 memset(&irq, 0, sizeof(irq));
346 irq.shorthand = APIC_DEST_SELF;
347 irq.dest_mode = APIC_DEST_PHYSICAL;
348 irq.delivery_mode = APIC_DM_FIXED;
349 irq.vector = vector;
350 irq.level = 1;
351
352 ret = kvm_irq_delivery_to_apic(vcpu->kvm, vcpu->arch.apic, &irq, NULL);
353 trace_kvm_hv_synic_set_irq(vcpu->vcpu_id, sint, irq.vector, ret);
354 return ret;
355}
356
357int kvm_hv_synic_set_irq(struct kvm *kvm, u32 vpidx, u32 sint)
358{
359 struct kvm_vcpu_hv_synic *synic;
360
361 synic = synic_get(kvm, vpidx);
362 if (!synic)
363 return -EINVAL;
364
365 return synic_set_irq(synic, sint);
366}
367
368void kvm_hv_synic_send_eoi(struct kvm_vcpu *vcpu, int vector)
369{
370 struct kvm_vcpu_hv_synic *synic = vcpu_to_synic(vcpu);
371 int i;
372
373 trace_kvm_hv_synic_send_eoi(vcpu->vcpu_id, vector);
374
375 for (i = 0; i < ARRAY_SIZE(synic->sint); i++)
376 if (synic_get_sint_vector(synic_read_sint(synic, i)) == vector)
377 kvm_hv_notify_acked_sint(vcpu, i);
378}
379
380static int kvm_hv_set_sint_gsi(struct kvm *kvm, u32 vpidx, u32 sint, int gsi)
381{
382 struct kvm_vcpu_hv_synic *synic;
383
384 synic = synic_get(kvm, vpidx);
385 if (!synic)
386 return -EINVAL;
387
388 if (sint >= ARRAY_SIZE(synic->sint_to_gsi))
389 return -EINVAL;
390
391 atomic_set(&synic->sint_to_gsi[sint], gsi);
392 return 0;
393}
394
395void kvm_hv_irq_routing_update(struct kvm *kvm)
396{
397 struct kvm_irq_routing_table *irq_rt;
398 struct kvm_kernel_irq_routing_entry *e;
399 u32 gsi;
400
401 irq_rt = srcu_dereference_check(kvm->irq_routing, &kvm->irq_srcu,
402 lockdep_is_held(&kvm->irq_lock));
403
404 for (gsi = 0; gsi < irq_rt->nr_rt_entries; gsi++) {
405 hlist_for_each_entry(e, &irq_rt->map[gsi], link) {
406 if (e->type == KVM_IRQ_ROUTING_HV_SINT)
407 kvm_hv_set_sint_gsi(kvm, e->hv_sint.vcpu,
408 e->hv_sint.sint, gsi);
409 }
410 }
411}
412
413static void synic_init(struct kvm_vcpu_hv_synic *synic)
414{
415 int i;
416
417 memset(synic, 0, sizeof(*synic));
418 synic->version = HV_SYNIC_VERSION_1;
419 for (i = 0; i < ARRAY_SIZE(synic->sint); i++) {
420 atomic64_set(&synic->sint[i], HV_SYNIC_SINT_MASKED);
421 atomic_set(&synic->sint_to_gsi[i], -1);
422 }
423}
424
425static u64 get_time_ref_counter(struct kvm *kvm)
426{
427 struct kvm_hv *hv = &kvm->arch.hyperv;
428 struct kvm_vcpu *vcpu;
429 u64 tsc;
430
431 /*
432 * The guest has not set up the TSC page or the clock isn't
433 * stable, fall back to get_kvmclock_ns.
434 */
435 if (!hv->tsc_ref.tsc_sequence)
436 return div_u64(get_kvmclock_ns(kvm), 100);
437
438 vcpu = kvm_get_vcpu(kvm, 0);
439 tsc = kvm_read_l1_tsc(vcpu, rdtsc());
440 return mul_u64_u64_shr(tsc, hv->tsc_ref.tsc_scale, 64)
441 + hv->tsc_ref.tsc_offset;
442}
443
444static void stimer_mark_pending(struct kvm_vcpu_hv_stimer *stimer,
445 bool vcpu_kick)
446{
447 struct kvm_vcpu *vcpu = stimer_to_vcpu(stimer);
448
449 set_bit(stimer->index,
450 vcpu_to_hv_vcpu(vcpu)->stimer_pending_bitmap);
451 kvm_make_request(KVM_REQ_HV_STIMER, vcpu);
452 if (vcpu_kick)
453 kvm_vcpu_kick(vcpu);
454}
455
456static void stimer_cleanup(struct kvm_vcpu_hv_stimer *stimer)
457{
458 struct kvm_vcpu *vcpu = stimer_to_vcpu(stimer);
459
460 trace_kvm_hv_stimer_cleanup(stimer_to_vcpu(stimer)->vcpu_id,
461 stimer->index);
462
463 hrtimer_cancel(&stimer->timer);
464 clear_bit(stimer->index,
465 vcpu_to_hv_vcpu(vcpu)->stimer_pending_bitmap);
466 stimer->msg_pending = false;
467 stimer->exp_time = 0;
468}
469
470static enum hrtimer_restart stimer_timer_callback(struct hrtimer *timer)
471{
472 struct kvm_vcpu_hv_stimer *stimer;
473
474 stimer = container_of(timer, struct kvm_vcpu_hv_stimer, timer);
475 trace_kvm_hv_stimer_callback(stimer_to_vcpu(stimer)->vcpu_id,
476 stimer->index);
477 stimer_mark_pending(stimer, true);
478
479 return HRTIMER_NORESTART;
480}
481
482/*
483 * stimer_start() assumptions:
484 * a) stimer->count is not equal to 0
485 * b) stimer->config has HV_STIMER_ENABLE flag
486 */
487static int stimer_start(struct kvm_vcpu_hv_stimer *stimer)
488{
489 u64 time_now;
490 ktime_t ktime_now;
491
492 time_now = get_time_ref_counter(stimer_to_vcpu(stimer)->kvm);
493 ktime_now = ktime_get();
494
495 if (stimer->config & HV_STIMER_PERIODIC) {
496 if (stimer->exp_time) {
497 if (time_now >= stimer->exp_time) {
498 u64 remainder;
499
500 div64_u64_rem(time_now - stimer->exp_time,
501 stimer->count, &remainder);
502 stimer->exp_time =
503 time_now + (stimer->count - remainder);
504 }
505 } else
506 stimer->exp_time = time_now + stimer->count;
507
508 trace_kvm_hv_stimer_start_periodic(
509 stimer_to_vcpu(stimer)->vcpu_id,
510 stimer->index,
511 time_now, stimer->exp_time);
512
513 hrtimer_start(&stimer->timer,
514 ktime_add_ns(ktime_now,
515 100 * (stimer->exp_time - time_now)),
516 HRTIMER_MODE_ABS);
517 return 0;
518 }
519 stimer->exp_time = stimer->count;
520 if (time_now >= stimer->count) {
521 /*
522 * Expire timer according to Hypervisor Top-Level Functional
523 * specification v4(15.3.1):
524 * "If a one shot is enabled and the specified count is in
525 * the past, it will expire immediately."
526 */
527 stimer_mark_pending(stimer, false);
528 return 0;
529 }
530
531 trace_kvm_hv_stimer_start_one_shot(stimer_to_vcpu(stimer)->vcpu_id,
532 stimer->index,
533 time_now, stimer->count);
534
535 hrtimer_start(&stimer->timer,
536 ktime_add_ns(ktime_now, 100 * (stimer->count - time_now)),
537 HRTIMER_MODE_ABS);
538 return 0;
539}
540
541static int stimer_set_config(struct kvm_vcpu_hv_stimer *stimer, u64 config,
542 bool host)
543{
544 trace_kvm_hv_stimer_set_config(stimer_to_vcpu(stimer)->vcpu_id,
545 stimer->index, config, host);
546
547 stimer_cleanup(stimer);
548 if ((stimer->config & HV_STIMER_ENABLE) && HV_STIMER_SINT(config) == 0)
549 config &= ~HV_STIMER_ENABLE;
550 stimer->config = config;
551 stimer_mark_pending(stimer, false);
552 return 0;
553}
554
555static int stimer_set_count(struct kvm_vcpu_hv_stimer *stimer, u64 count,
556 bool host)
557{
558 trace_kvm_hv_stimer_set_count(stimer_to_vcpu(stimer)->vcpu_id,
559 stimer->index, count, host);
560
561 stimer_cleanup(stimer);
562 stimer->count = count;
563 if (stimer->count == 0)
564 stimer->config &= ~HV_STIMER_ENABLE;
565 else if (stimer->config & HV_STIMER_AUTOENABLE)
566 stimer->config |= HV_STIMER_ENABLE;
567 stimer_mark_pending(stimer, false);
568 return 0;
569}
570
571static int stimer_get_config(struct kvm_vcpu_hv_stimer *stimer, u64 *pconfig)
572{
573 *pconfig = stimer->config;
574 return 0;
575}
576
577static int stimer_get_count(struct kvm_vcpu_hv_stimer *stimer, u64 *pcount)
578{
579 *pcount = stimer->count;
580 return 0;
581}
582
583static int synic_deliver_msg(struct kvm_vcpu_hv_synic *synic, u32 sint,
584 struct hv_message *src_msg)
585{
586 struct kvm_vcpu *vcpu = synic_to_vcpu(synic);
587 struct page *page;
588 gpa_t gpa;
589 struct hv_message *dst_msg;
590 int r;
591 struct hv_message_page *msg_page;
592
593 if (!(synic->msg_page & HV_SYNIC_SIMP_ENABLE))
594 return -ENOENT;
595
596 gpa = synic->msg_page & PAGE_MASK;
597 page = kvm_vcpu_gfn_to_page(vcpu, gpa >> PAGE_SHIFT);
598 if (is_error_page(page))
599 return -EFAULT;
600
601 msg_page = kmap_atomic(page);
602 dst_msg = &msg_page->sint_message[sint];
603 if (sync_cmpxchg(&dst_msg->header.message_type, HVMSG_NONE,
604 src_msg->header.message_type) != HVMSG_NONE) {
605 dst_msg->header.message_flags.msg_pending = 1;
606 r = -EAGAIN;
607 } else {
608 memcpy(&dst_msg->u.payload, &src_msg->u.payload,
609 src_msg->header.payload_size);
610 dst_msg->header.message_type = src_msg->header.message_type;
611 dst_msg->header.payload_size = src_msg->header.payload_size;
612 r = synic_set_irq(synic, sint);
613 if (r >= 1)
614 r = 0;
615 else if (r == 0)
616 r = -EFAULT;
617 }
618 kunmap_atomic(msg_page);
619 kvm_release_page_dirty(page);
620 kvm_vcpu_mark_page_dirty(vcpu, gpa >> PAGE_SHIFT);
621 return r;
622}
623
624static int stimer_send_msg(struct kvm_vcpu_hv_stimer *stimer)
625{
626 struct kvm_vcpu *vcpu = stimer_to_vcpu(stimer);
627 struct hv_message *msg = &stimer->msg;
628 struct hv_timer_message_payload *payload =
629 (struct hv_timer_message_payload *)&msg->u.payload;
630
631 payload->expiration_time = stimer->exp_time;
632 payload->delivery_time = get_time_ref_counter(vcpu->kvm);
633 return synic_deliver_msg(vcpu_to_synic(vcpu),
634 HV_STIMER_SINT(stimer->config), msg);
635}
636
637static void stimer_expiration(struct kvm_vcpu_hv_stimer *stimer)
638{
639 int r;
640
641 stimer->msg_pending = true;
642 r = stimer_send_msg(stimer);
643 trace_kvm_hv_stimer_expiration(stimer_to_vcpu(stimer)->vcpu_id,
644 stimer->index, r);
645 if (!r) {
646 stimer->msg_pending = false;
647 if (!(stimer->config & HV_STIMER_PERIODIC))
648 stimer->config &= ~HV_STIMER_ENABLE;
649 }
650}
651
652void kvm_hv_process_stimers(struct kvm_vcpu *vcpu)
653{
654 struct kvm_vcpu_hv *hv_vcpu = vcpu_to_hv_vcpu(vcpu);
655 struct kvm_vcpu_hv_stimer *stimer;
656 u64 time_now, exp_time;
657 int i;
658
659 for (i = 0; i < ARRAY_SIZE(hv_vcpu->stimer); i++)
660 if (test_and_clear_bit(i, hv_vcpu->stimer_pending_bitmap)) {
661 stimer = &hv_vcpu->stimer[i];
662 if (stimer->config & HV_STIMER_ENABLE) {
663 exp_time = stimer->exp_time;
664
665 if (exp_time) {
666 time_now =
667 get_time_ref_counter(vcpu->kvm);
668 if (time_now >= exp_time)
669 stimer_expiration(stimer);
670 }
671
672 if ((stimer->config & HV_STIMER_ENABLE) &&
673 stimer->count) {
674 if (!stimer->msg_pending)
675 stimer_start(stimer);
676 } else
677 stimer_cleanup(stimer);
678 }
679 }
680}
681
682void kvm_hv_vcpu_uninit(struct kvm_vcpu *vcpu)
683{
684 struct kvm_vcpu_hv *hv_vcpu = vcpu_to_hv_vcpu(vcpu);
685 int i;
686
687 for (i = 0; i < ARRAY_SIZE(hv_vcpu->stimer); i++)
688 stimer_cleanup(&hv_vcpu->stimer[i]);
689}
690
691static void stimer_prepare_msg(struct kvm_vcpu_hv_stimer *stimer)
692{
693 struct hv_message *msg = &stimer->msg;
694 struct hv_timer_message_payload *payload =
695 (struct hv_timer_message_payload *)&msg->u.payload;
696
697 memset(&msg->header, 0, sizeof(msg->header));
698 msg->header.message_type = HVMSG_TIMER_EXPIRED;
699 msg->header.payload_size = sizeof(*payload);
700
701 payload->timer_index = stimer->index;
702 payload->expiration_time = 0;
703 payload->delivery_time = 0;
704}
705
706static void stimer_init(struct kvm_vcpu_hv_stimer *stimer, int timer_index)
707{
708 memset(stimer, 0, sizeof(*stimer));
709 stimer->index = timer_index;
710 hrtimer_init(&stimer->timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
711 stimer->timer.function = stimer_timer_callback;
712 stimer_prepare_msg(stimer);
713}
714
715void kvm_hv_vcpu_init(struct kvm_vcpu *vcpu)
716{
717 struct kvm_vcpu_hv *hv_vcpu = vcpu_to_hv_vcpu(vcpu);
718 int i;
719
720 synic_init(&hv_vcpu->synic);
721
722 bitmap_zero(hv_vcpu->stimer_pending_bitmap, HV_SYNIC_STIMER_COUNT);
723 for (i = 0; i < ARRAY_SIZE(hv_vcpu->stimer); i++)
724 stimer_init(&hv_vcpu->stimer[i], i);
725}
726
727void kvm_hv_vcpu_postcreate(struct kvm_vcpu *vcpu)
728{
729 struct kvm_vcpu_hv *hv_vcpu = vcpu_to_hv_vcpu(vcpu);
730
731 hv_vcpu->vp_index = kvm_vcpu_get_idx(vcpu);
732}
733
734int kvm_hv_activate_synic(struct kvm_vcpu *vcpu, bool dont_zero_synic_pages)
735{
736 struct kvm_vcpu_hv_synic *synic = vcpu_to_synic(vcpu);
737
738 /*
739 * Hyper-V SynIC auto EOI SINT's are
740 * not compatible with APICV, so deactivate APICV
741 */
742 kvm_vcpu_deactivate_apicv(vcpu);
743 synic->active = true;
744 synic->dont_zero_synic_pages = dont_zero_synic_pages;
745 return 0;
746}
747
748static bool kvm_hv_msr_partition_wide(u32 msr)
749{
750 bool r = false;
751
752 switch (msr) {
753 case HV_X64_MSR_GUEST_OS_ID:
754 case HV_X64_MSR_HYPERCALL:
755 case HV_X64_MSR_REFERENCE_TSC:
756 case HV_X64_MSR_TIME_REF_COUNT:
757 case HV_X64_MSR_CRASH_CTL:
758 case HV_X64_MSR_CRASH_P0 ... HV_X64_MSR_CRASH_P4:
759 case HV_X64_MSR_RESET:
760 case HV_X64_MSR_REENLIGHTENMENT_CONTROL:
761 case HV_X64_MSR_TSC_EMULATION_CONTROL:
762 case HV_X64_MSR_TSC_EMULATION_STATUS:
763 r = true;
764 break;
765 }
766
767 return r;
768}
769
770static int kvm_hv_msr_get_crash_data(struct kvm_vcpu *vcpu,
771 u32 index, u64 *pdata)
772{
773 struct kvm_hv *hv = &vcpu->kvm->arch.hyperv;
774
775 if (WARN_ON_ONCE(index >= ARRAY_SIZE(hv->hv_crash_param)))
776 return -EINVAL;
777
778 *pdata = hv->hv_crash_param[index];
779 return 0;
780}
781
782static int kvm_hv_msr_get_crash_ctl(struct kvm_vcpu *vcpu, u64 *pdata)
783{
784 struct kvm_hv *hv = &vcpu->kvm->arch.hyperv;
785
786 *pdata = hv->hv_crash_ctl;
787 return 0;
788}
789
790static int kvm_hv_msr_set_crash_ctl(struct kvm_vcpu *vcpu, u64 data, bool host)
791{
792 struct kvm_hv *hv = &vcpu->kvm->arch.hyperv;
793
794 if (host)
795 hv->hv_crash_ctl = data & HV_X64_MSR_CRASH_CTL_NOTIFY;
796
797 if (!host && (data & HV_X64_MSR_CRASH_CTL_NOTIFY)) {
798
799 vcpu_debug(vcpu, "hv crash (0x%llx 0x%llx 0x%llx 0x%llx 0x%llx)\n",
800 hv->hv_crash_param[0],
801 hv->hv_crash_param[1],
802 hv->hv_crash_param[2],
803 hv->hv_crash_param[3],
804 hv->hv_crash_param[4]);
805
806 /* Send notification about crash to user space */
807 kvm_make_request(KVM_REQ_HV_CRASH, vcpu);
808 }
809
810 return 0;
811}
812
813static int kvm_hv_msr_set_crash_data(struct kvm_vcpu *vcpu,
814 u32 index, u64 data)
815{
816 struct kvm_hv *hv = &vcpu->kvm->arch.hyperv;
817
818 if (WARN_ON_ONCE(index >= ARRAY_SIZE(hv->hv_crash_param)))
819 return -EINVAL;
820
821 hv->hv_crash_param[index] = data;
822 return 0;
823}
824
825/*
826 * The kvmclock and Hyper-V TSC page use similar formulas, and converting
827 * between them is possible:
828 *
829 * kvmclock formula:
830 * nsec = (ticks - tsc_timestamp) * tsc_to_system_mul * 2^(tsc_shift-32)
831 * + system_time
832 *
833 * Hyper-V formula:
834 * nsec/100 = ticks * scale / 2^64 + offset
835 *
836 * When tsc_timestamp = system_time = 0, offset is zero in the Hyper-V formula.
837 * By dividing the kvmclock formula by 100 and equating what's left we get:
838 * ticks * scale / 2^64 = ticks * tsc_to_system_mul * 2^(tsc_shift-32) / 100
839 * scale / 2^64 = tsc_to_system_mul * 2^(tsc_shift-32) / 100
840 * scale = tsc_to_system_mul * 2^(32+tsc_shift) / 100
841 *
842 * Now expand the kvmclock formula and divide by 100:
843 * nsec = ticks * tsc_to_system_mul * 2^(tsc_shift-32)
844 * - tsc_timestamp * tsc_to_system_mul * 2^(tsc_shift-32)
845 * + system_time
846 * nsec/100 = ticks * tsc_to_system_mul * 2^(tsc_shift-32) / 100
847 * - tsc_timestamp * tsc_to_system_mul * 2^(tsc_shift-32) / 100
848 * + system_time / 100
849 *
850 * Replace tsc_to_system_mul * 2^(tsc_shift-32) / 100 by scale / 2^64:
851 * nsec/100 = ticks * scale / 2^64
852 * - tsc_timestamp * scale / 2^64
853 * + system_time / 100
854 *
855 * Equate with the Hyper-V formula so that ticks * scale / 2^64 cancels out:
856 * offset = system_time / 100 - tsc_timestamp * scale / 2^64
857 *
858 * These two equivalencies are implemented in this function.
859 */
860static bool compute_tsc_page_parameters(struct pvclock_vcpu_time_info *hv_clock,
861 HV_REFERENCE_TSC_PAGE *tsc_ref)
862{
863 u64 max_mul;
864
865 if (!(hv_clock->flags & PVCLOCK_TSC_STABLE_BIT))
866 return false;
867
868 /*
869 * check if scale would overflow, if so we use the time ref counter
870 * tsc_to_system_mul * 2^(tsc_shift+32) / 100 >= 2^64
871 * tsc_to_system_mul / 100 >= 2^(32-tsc_shift)
872 * tsc_to_system_mul >= 100 * 2^(32-tsc_shift)
873 */
874 max_mul = 100ull << (32 - hv_clock->tsc_shift);
875 if (hv_clock->tsc_to_system_mul >= max_mul)
876 return false;
877
878 /*
879 * Otherwise compute the scale and offset according to the formulas
880 * derived above.
881 */
882 tsc_ref->tsc_scale =
883 mul_u64_u32_div(1ULL << (32 + hv_clock->tsc_shift),
884 hv_clock->tsc_to_system_mul,
885 100);
886
887 tsc_ref->tsc_offset = hv_clock->system_time;
888 do_div(tsc_ref->tsc_offset, 100);
889 tsc_ref->tsc_offset -=
890 mul_u64_u64_shr(hv_clock->tsc_timestamp, tsc_ref->tsc_scale, 64);
891 return true;
892}
893
894void kvm_hv_setup_tsc_page(struct kvm *kvm,
895 struct pvclock_vcpu_time_info *hv_clock)
896{
897 struct kvm_hv *hv = &kvm->arch.hyperv;
898 u32 tsc_seq;
899 u64 gfn;
900
901 BUILD_BUG_ON(sizeof(tsc_seq) != sizeof(hv->tsc_ref.tsc_sequence));
902 BUILD_BUG_ON(offsetof(HV_REFERENCE_TSC_PAGE, tsc_sequence) != 0);
903
904 if (!(hv->hv_tsc_page & HV_X64_MSR_TSC_REFERENCE_ENABLE))
905 return;
906
907 mutex_lock(&kvm->arch.hyperv.hv_lock);
908 if (!(hv->hv_tsc_page & HV_X64_MSR_TSC_REFERENCE_ENABLE))
909 goto out_unlock;
910
911 gfn = hv->hv_tsc_page >> HV_X64_MSR_TSC_REFERENCE_ADDRESS_SHIFT;
912 /*
913 * Because the TSC parameters only vary when there is a
914 * change in the master clock, do not bother with caching.
915 */
916 if (unlikely(kvm_read_guest(kvm, gfn_to_gpa(gfn),
917 &tsc_seq, sizeof(tsc_seq))))
918 goto out_unlock;
919
920 /*
921 * While we're computing and writing the parameters, force the
922 * guest to use the time reference count MSR.
923 */
924 hv->tsc_ref.tsc_sequence = 0;
925 if (kvm_write_guest(kvm, gfn_to_gpa(gfn),
926 &hv->tsc_ref, sizeof(hv->tsc_ref.tsc_sequence)))
927 goto out_unlock;
928
929 if (!compute_tsc_page_parameters(hv_clock, &hv->tsc_ref))
930 goto out_unlock;
931
932 /* Ensure sequence is zero before writing the rest of the struct. */
933 smp_wmb();
934 if (kvm_write_guest(kvm, gfn_to_gpa(gfn), &hv->tsc_ref, sizeof(hv->tsc_ref)))
935 goto out_unlock;
936
937 /*
938 * Now switch to the TSC page mechanism by writing the sequence.
939 */
940 tsc_seq++;
941 if (tsc_seq == 0xFFFFFFFF || tsc_seq == 0)
942 tsc_seq = 1;
943
944 /* Write the struct entirely before the non-zero sequence. */
945 smp_wmb();
946
947 hv->tsc_ref.tsc_sequence = tsc_seq;
948 kvm_write_guest(kvm, gfn_to_gpa(gfn),
949 &hv->tsc_ref, sizeof(hv->tsc_ref.tsc_sequence));
950out_unlock:
951 mutex_unlock(&kvm->arch.hyperv.hv_lock);
952}
953
954static int kvm_hv_set_msr_pw(struct kvm_vcpu *vcpu, u32 msr, u64 data,
955 bool host)
956{
957 struct kvm *kvm = vcpu->kvm;
958 struct kvm_hv *hv = &kvm->arch.hyperv;
959
960 switch (msr) {
961 case HV_X64_MSR_GUEST_OS_ID:
962 hv->hv_guest_os_id = data;
963 /* setting guest os id to zero disables hypercall page */
964 if (!hv->hv_guest_os_id)
965 hv->hv_hypercall &= ~HV_X64_MSR_HYPERCALL_ENABLE;
966 break;
967 case HV_X64_MSR_HYPERCALL: {
968 u64 gfn;
969 unsigned long addr;
970 u8 instructions[4];
971
972 /* if guest os id is not set hypercall should remain disabled */
973 if (!hv->hv_guest_os_id)
974 break;
975 if (!(data & HV_X64_MSR_HYPERCALL_ENABLE)) {
976 hv->hv_hypercall = data;
977 break;
978 }
979 gfn = data >> HV_X64_MSR_HYPERCALL_PAGE_ADDRESS_SHIFT;
980 addr = gfn_to_hva(kvm, gfn);
981 if (kvm_is_error_hva(addr))
982 return 1;
983 kvm_x86_ops->patch_hypercall(vcpu, instructions);
984 ((unsigned char *)instructions)[3] = 0xc3; /* ret */
985 if (__copy_to_user((void __user *)addr, instructions, 4))
986 return 1;
987 hv->hv_hypercall = data;
988 mark_page_dirty(kvm, gfn);
989 break;
990 }
991 case HV_X64_MSR_REFERENCE_TSC:
992 hv->hv_tsc_page = data;
993 if (hv->hv_tsc_page & HV_X64_MSR_TSC_REFERENCE_ENABLE)
994 kvm_make_request(KVM_REQ_MASTERCLOCK_UPDATE, vcpu);
995 break;
996 case HV_X64_MSR_CRASH_P0 ... HV_X64_MSR_CRASH_P4:
997 return kvm_hv_msr_set_crash_data(vcpu,
998 msr - HV_X64_MSR_CRASH_P0,
999 data);
1000 case HV_X64_MSR_CRASH_CTL:
1001 return kvm_hv_msr_set_crash_ctl(vcpu, data, host);
1002 case HV_X64_MSR_RESET:
1003 if (data == 1) {
1004 vcpu_debug(vcpu, "hyper-v reset requested\n");
1005 kvm_make_request(KVM_REQ_HV_RESET, vcpu);
1006 }
1007 break;
1008 case HV_X64_MSR_REENLIGHTENMENT_CONTROL:
1009 hv->hv_reenlightenment_control = data;
1010 break;
1011 case HV_X64_MSR_TSC_EMULATION_CONTROL:
1012 hv->hv_tsc_emulation_control = data;
1013 break;
1014 case HV_X64_MSR_TSC_EMULATION_STATUS:
1015 hv->hv_tsc_emulation_status = data;
1016 break;
1017 default:
1018 vcpu_unimpl(vcpu, "Hyper-V uhandled wrmsr: 0x%x data 0x%llx\n",
1019 msr, data);
1020 return 1;
1021 }
1022 return 0;
1023}
1024
1025/* Calculate cpu time spent by current task in 100ns units */
1026static u64 current_task_runtime_100ns(void)
1027{
1028 u64 utime, stime;
1029
1030 task_cputime_adjusted(current, &utime, &stime);
1031
1032 return div_u64(utime + stime, 100);
1033}
1034
1035static int kvm_hv_set_msr(struct kvm_vcpu *vcpu, u32 msr, u64 data, bool host)
1036{
1037 struct kvm_vcpu_hv *hv = &vcpu->arch.hyperv;
1038
1039 switch (msr) {
1040 case HV_X64_MSR_VP_INDEX:
1041 if (!host)
1042 return 1;
1043 hv->vp_index = (u32)data;
1044 break;
1045 case HV_X64_MSR_VP_ASSIST_PAGE: {
1046 u64 gfn;
1047 unsigned long addr;
1048
1049 if (!(data & HV_X64_MSR_VP_ASSIST_PAGE_ENABLE)) {
1050 hv->hv_vapic = data;
1051 if (kvm_lapic_enable_pv_eoi(vcpu, 0))
1052 return 1;
1053 break;
1054 }
1055 gfn = data >> HV_X64_MSR_VP_ASSIST_PAGE_ADDRESS_SHIFT;
1056 addr = kvm_vcpu_gfn_to_hva(vcpu, gfn);
1057 if (kvm_is_error_hva(addr))
1058 return 1;
1059 if (__clear_user((void __user *)addr, PAGE_SIZE))
1060 return 1;
1061 hv->hv_vapic = data;
1062 kvm_vcpu_mark_page_dirty(vcpu, gfn);
1063 if (kvm_lapic_enable_pv_eoi(vcpu,
1064 gfn_to_gpa(gfn) | KVM_MSR_ENABLED))
1065 return 1;
1066 break;
1067 }
1068 case HV_X64_MSR_EOI:
1069 return kvm_hv_vapic_msr_write(vcpu, APIC_EOI, data);
1070 case HV_X64_MSR_ICR:
1071 return kvm_hv_vapic_msr_write(vcpu, APIC_ICR, data);
1072 case HV_X64_MSR_TPR:
1073 return kvm_hv_vapic_msr_write(vcpu, APIC_TASKPRI, data);
1074 case HV_X64_MSR_VP_RUNTIME:
1075 if (!host)
1076 return 1;
1077 hv->runtime_offset = data - current_task_runtime_100ns();
1078 break;
1079 case HV_X64_MSR_SCONTROL:
1080 case HV_X64_MSR_SVERSION:
1081 case HV_X64_MSR_SIEFP:
1082 case HV_X64_MSR_SIMP:
1083 case HV_X64_MSR_EOM:
1084 case HV_X64_MSR_SINT0 ... HV_X64_MSR_SINT15:
1085 return synic_set_msr(vcpu_to_synic(vcpu), msr, data, host);
1086 case HV_X64_MSR_STIMER0_CONFIG:
1087 case HV_X64_MSR_STIMER1_CONFIG:
1088 case HV_X64_MSR_STIMER2_CONFIG:
1089 case HV_X64_MSR_STIMER3_CONFIG: {
1090 int timer_index = (msr - HV_X64_MSR_STIMER0_CONFIG)/2;
1091
1092 return stimer_set_config(vcpu_to_stimer(vcpu, timer_index),
1093 data, host);
1094 }
1095 case HV_X64_MSR_STIMER0_COUNT:
1096 case HV_X64_MSR_STIMER1_COUNT:
1097 case HV_X64_MSR_STIMER2_COUNT:
1098 case HV_X64_MSR_STIMER3_COUNT: {
1099 int timer_index = (msr - HV_X64_MSR_STIMER0_COUNT)/2;
1100
1101 return stimer_set_count(vcpu_to_stimer(vcpu, timer_index),
1102 data, host);
1103 }
1104 default:
1105 vcpu_unimpl(vcpu, "Hyper-V uhandled wrmsr: 0x%x data 0x%llx\n",
1106 msr, data);
1107 return 1;
1108 }
1109
1110 return 0;
1111}
1112
1113static int kvm_hv_get_msr_pw(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1114{
1115 u64 data = 0;
1116 struct kvm *kvm = vcpu->kvm;
1117 struct kvm_hv *hv = &kvm->arch.hyperv;
1118
1119 switch (msr) {
1120 case HV_X64_MSR_GUEST_OS_ID:
1121 data = hv->hv_guest_os_id;
1122 break;
1123 case HV_X64_MSR_HYPERCALL:
1124 data = hv->hv_hypercall;
1125 break;
1126 case HV_X64_MSR_TIME_REF_COUNT:
1127 data = get_time_ref_counter(kvm);
1128 break;
1129 case HV_X64_MSR_REFERENCE_TSC:
1130 data = hv->hv_tsc_page;
1131 break;
1132 case HV_X64_MSR_CRASH_P0 ... HV_X64_MSR_CRASH_P4:
1133 return kvm_hv_msr_get_crash_data(vcpu,
1134 msr - HV_X64_MSR_CRASH_P0,
1135 pdata);
1136 case HV_X64_MSR_CRASH_CTL:
1137 return kvm_hv_msr_get_crash_ctl(vcpu, pdata);
1138 case HV_X64_MSR_RESET:
1139 data = 0;
1140 break;
1141 case HV_X64_MSR_REENLIGHTENMENT_CONTROL:
1142 data = hv->hv_reenlightenment_control;
1143 break;
1144 case HV_X64_MSR_TSC_EMULATION_CONTROL:
1145 data = hv->hv_tsc_emulation_control;
1146 break;
1147 case HV_X64_MSR_TSC_EMULATION_STATUS:
1148 data = hv->hv_tsc_emulation_status;
1149 break;
1150 default:
1151 vcpu_unimpl(vcpu, "Hyper-V unhandled rdmsr: 0x%x\n", msr);
1152 return 1;
1153 }
1154
1155 *pdata = data;
1156 return 0;
1157}
1158
1159static int kvm_hv_get_msr(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1160{
1161 u64 data = 0;
1162 struct kvm_vcpu_hv *hv = &vcpu->arch.hyperv;
1163
1164 switch (msr) {
1165 case HV_X64_MSR_VP_INDEX:
1166 data = hv->vp_index;
1167 break;
1168 case HV_X64_MSR_EOI:
1169 return kvm_hv_vapic_msr_read(vcpu, APIC_EOI, pdata);
1170 case HV_X64_MSR_ICR:
1171 return kvm_hv_vapic_msr_read(vcpu, APIC_ICR, pdata);
1172 case HV_X64_MSR_TPR:
1173 return kvm_hv_vapic_msr_read(vcpu, APIC_TASKPRI, pdata);
1174 case HV_X64_MSR_VP_ASSIST_PAGE:
1175 data = hv->hv_vapic;
1176 break;
1177 case HV_X64_MSR_VP_RUNTIME:
1178 data = current_task_runtime_100ns() + hv->runtime_offset;
1179 break;
1180 case HV_X64_MSR_SCONTROL:
1181 case HV_X64_MSR_SVERSION:
1182 case HV_X64_MSR_SIEFP:
1183 case HV_X64_MSR_SIMP:
1184 case HV_X64_MSR_EOM:
1185 case HV_X64_MSR_SINT0 ... HV_X64_MSR_SINT15:
1186 return synic_get_msr(vcpu_to_synic(vcpu), msr, pdata);
1187 case HV_X64_MSR_STIMER0_CONFIG:
1188 case HV_X64_MSR_STIMER1_CONFIG:
1189 case HV_X64_MSR_STIMER2_CONFIG:
1190 case HV_X64_MSR_STIMER3_CONFIG: {
1191 int timer_index = (msr - HV_X64_MSR_STIMER0_CONFIG)/2;
1192
1193 return stimer_get_config(vcpu_to_stimer(vcpu, timer_index),
1194 pdata);
1195 }
1196 case HV_X64_MSR_STIMER0_COUNT:
1197 case HV_X64_MSR_STIMER1_COUNT:
1198 case HV_X64_MSR_STIMER2_COUNT:
1199 case HV_X64_MSR_STIMER3_COUNT: {
1200 int timer_index = (msr - HV_X64_MSR_STIMER0_COUNT)/2;
1201
1202 return stimer_get_count(vcpu_to_stimer(vcpu, timer_index),
1203 pdata);
1204 }
1205 case HV_X64_MSR_TSC_FREQUENCY:
1206 data = (u64)vcpu->arch.virtual_tsc_khz * 1000;
1207 break;
1208 case HV_X64_MSR_APIC_FREQUENCY:
1209 data = APIC_BUS_FREQUENCY;
1210 break;
1211 default:
1212 vcpu_unimpl(vcpu, "Hyper-V unhandled rdmsr: 0x%x\n", msr);
1213 return 1;
1214 }
1215 *pdata = data;
1216 return 0;
1217}
1218
1219int kvm_hv_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data, bool host)
1220{
1221 if (kvm_hv_msr_partition_wide(msr)) {
1222 int r;
1223
1224 mutex_lock(&vcpu->kvm->arch.hyperv.hv_lock);
1225 r = kvm_hv_set_msr_pw(vcpu, msr, data, host);
1226 mutex_unlock(&vcpu->kvm->arch.hyperv.hv_lock);
1227 return r;
1228 } else
1229 return kvm_hv_set_msr(vcpu, msr, data, host);
1230}
1231
1232int kvm_hv_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1233{
1234 if (kvm_hv_msr_partition_wide(msr)) {
1235 int r;
1236
1237 mutex_lock(&vcpu->kvm->arch.hyperv.hv_lock);
1238 r = kvm_hv_get_msr_pw(vcpu, msr, pdata);
1239 mutex_unlock(&vcpu->kvm->arch.hyperv.hv_lock);
1240 return r;
1241 } else
1242 return kvm_hv_get_msr(vcpu, msr, pdata);
1243}
1244
1245bool kvm_hv_hypercall_enabled(struct kvm *kvm)
1246{
1247 return READ_ONCE(kvm->arch.hyperv.hv_hypercall) & HV_X64_MSR_HYPERCALL_ENABLE;
1248}
1249
1250static void kvm_hv_hypercall_set_result(struct kvm_vcpu *vcpu, u64 result)
1251{
1252 bool longmode;
1253
1254 longmode = is_64_bit_mode(vcpu);
1255 if (longmode)
1256 kvm_register_write(vcpu, VCPU_REGS_RAX, result);
1257 else {
1258 kvm_register_write(vcpu, VCPU_REGS_RDX, result >> 32);
1259 kvm_register_write(vcpu, VCPU_REGS_RAX, result & 0xffffffff);
1260 }
1261}
1262
1263static int kvm_hv_hypercall_complete(struct kvm_vcpu *vcpu, u64 result)
1264{
1265 kvm_hv_hypercall_set_result(vcpu, result);
1266 ++vcpu->stat.hypercalls;
1267 return kvm_skip_emulated_instruction(vcpu);
1268}
1269
1270static int kvm_hv_hypercall_complete_userspace(struct kvm_vcpu *vcpu)
1271{
1272 return kvm_hv_hypercall_complete(vcpu, vcpu->run->hyperv.u.hcall.result);
1273}
1274
1275static u16 kvm_hvcall_signal_event(struct kvm_vcpu *vcpu, bool fast, u64 param)
1276{
1277 struct eventfd_ctx *eventfd;
1278
1279 if (unlikely(!fast)) {
1280 int ret;
1281 gpa_t gpa = param;
1282
1283 if ((gpa & (__alignof__(param) - 1)) ||
1284 offset_in_page(gpa) + sizeof(param) > PAGE_SIZE)
1285 return HV_STATUS_INVALID_ALIGNMENT;
1286
1287 ret = kvm_vcpu_read_guest(vcpu, gpa, ¶m, sizeof(param));
1288 if (ret < 0)
1289 return HV_STATUS_INVALID_ALIGNMENT;
1290 }
1291
1292 /*
1293 * Per spec, bits 32-47 contain the extra "flag number". However, we
1294 * have no use for it, and in all known usecases it is zero, so just
1295 * report lookup failure if it isn't.
1296 */
1297 if (param & 0xffff00000000ULL)
1298 return HV_STATUS_INVALID_PORT_ID;
1299 /* remaining bits are reserved-zero */
1300 if (param & ~KVM_HYPERV_CONN_ID_MASK)
1301 return HV_STATUS_INVALID_HYPERCALL_INPUT;
1302
1303 /* the eventfd is protected by vcpu->kvm->srcu, but conn_to_evt isn't */
1304 rcu_read_lock();
1305 eventfd = idr_find(&vcpu->kvm->arch.hyperv.conn_to_evt, param);
1306 rcu_read_unlock();
1307 if (!eventfd)
1308 return HV_STATUS_INVALID_PORT_ID;
1309
1310 eventfd_signal(eventfd, 1);
1311 return HV_STATUS_SUCCESS;
1312}
1313
1314int kvm_hv_hypercall(struct kvm_vcpu *vcpu)
1315{
1316 u64 param, ingpa, outgpa, ret = HV_STATUS_SUCCESS;
1317 uint16_t code, rep_idx, rep_cnt;
1318 bool fast, longmode;
1319
1320 /*
1321 * hypercall generates UD from non zero cpl and real mode
1322 * per HYPER-V spec
1323 */
1324 if (kvm_x86_ops->get_cpl(vcpu) != 0 || !is_protmode(vcpu)) {
1325 kvm_queue_exception(vcpu, UD_VECTOR);
1326 return 1;
1327 }
1328
1329 longmode = is_64_bit_mode(vcpu);
1330
1331 if (!longmode) {
1332 param = ((u64)kvm_register_read(vcpu, VCPU_REGS_RDX) << 32) |
1333 (kvm_register_read(vcpu, VCPU_REGS_RAX) & 0xffffffff);
1334 ingpa = ((u64)kvm_register_read(vcpu, VCPU_REGS_RBX) << 32) |
1335 (kvm_register_read(vcpu, VCPU_REGS_RCX) & 0xffffffff);
1336 outgpa = ((u64)kvm_register_read(vcpu, VCPU_REGS_RDI) << 32) |
1337 (kvm_register_read(vcpu, VCPU_REGS_RSI) & 0xffffffff);
1338 }
1339#ifdef CONFIG_X86_64
1340 else {
1341 param = kvm_register_read(vcpu, VCPU_REGS_RCX);
1342 ingpa = kvm_register_read(vcpu, VCPU_REGS_RDX);
1343 outgpa = kvm_register_read(vcpu, VCPU_REGS_R8);
1344 }
1345#endif
1346
1347 code = param & 0xffff;
1348 fast = (param >> 16) & 0x1;
1349 rep_cnt = (param >> 32) & 0xfff;
1350 rep_idx = (param >> 48) & 0xfff;
1351
1352 trace_kvm_hv_hypercall(code, fast, rep_cnt, rep_idx, ingpa, outgpa);
1353
1354 /* Hypercall continuation is not supported yet */
1355 if (rep_cnt || rep_idx) {
1356 ret = HV_STATUS_INVALID_HYPERCALL_CODE;
1357 goto out;
1358 }
1359
1360 switch (code) {
1361 case HVCALL_NOTIFY_LONG_SPIN_WAIT:
1362 kvm_vcpu_on_spin(vcpu, true);
1363 break;
1364 case HVCALL_SIGNAL_EVENT:
1365 ret = kvm_hvcall_signal_event(vcpu, fast, ingpa);
1366 if (ret != HV_STATUS_INVALID_PORT_ID)
1367 break;
1368 /* maybe userspace knows this conn_id: fall through */
1369 case HVCALL_POST_MESSAGE:
1370 /* don't bother userspace if it has no way to handle it */
1371 if (!vcpu_to_synic(vcpu)->active) {
1372 ret = HV_STATUS_INVALID_HYPERCALL_CODE;
1373 break;
1374 }
1375 vcpu->run->exit_reason = KVM_EXIT_HYPERV;
1376 vcpu->run->hyperv.type = KVM_EXIT_HYPERV_HCALL;
1377 vcpu->run->hyperv.u.hcall.input = param;
1378 vcpu->run->hyperv.u.hcall.params[0] = ingpa;
1379 vcpu->run->hyperv.u.hcall.params[1] = outgpa;
1380 vcpu->arch.complete_userspace_io =
1381 kvm_hv_hypercall_complete_userspace;
1382 return 0;
1383 default:
1384 ret = HV_STATUS_INVALID_HYPERCALL_CODE;
1385 break;
1386 }
1387
1388out:
1389 return kvm_hv_hypercall_complete(vcpu, ret);
1390}
1391
1392void kvm_hv_init_vm(struct kvm *kvm)
1393{
1394 mutex_init(&kvm->arch.hyperv.hv_lock);
1395 idr_init(&kvm->arch.hyperv.conn_to_evt);
1396}
1397
1398void kvm_hv_destroy_vm(struct kvm *kvm)
1399{
1400 struct eventfd_ctx *eventfd;
1401 int i;
1402
1403 idr_for_each_entry(&kvm->arch.hyperv.conn_to_evt, eventfd, i)
1404 eventfd_ctx_put(eventfd);
1405 idr_destroy(&kvm->arch.hyperv.conn_to_evt);
1406}
1407
1408static int kvm_hv_eventfd_assign(struct kvm *kvm, u32 conn_id, int fd)
1409{
1410 struct kvm_hv *hv = &kvm->arch.hyperv;
1411 struct eventfd_ctx *eventfd;
1412 int ret;
1413
1414 eventfd = eventfd_ctx_fdget(fd);
1415 if (IS_ERR(eventfd))
1416 return PTR_ERR(eventfd);
1417
1418 mutex_lock(&hv->hv_lock);
1419 ret = idr_alloc(&hv->conn_to_evt, eventfd, conn_id, conn_id + 1,
1420 GFP_KERNEL);
1421 mutex_unlock(&hv->hv_lock);
1422
1423 if (ret >= 0)
1424 return 0;
1425
1426 if (ret == -ENOSPC)
1427 ret = -EEXIST;
1428 eventfd_ctx_put(eventfd);
1429 return ret;
1430}
1431
1432static int kvm_hv_eventfd_deassign(struct kvm *kvm, u32 conn_id)
1433{
1434 struct kvm_hv *hv = &kvm->arch.hyperv;
1435 struct eventfd_ctx *eventfd;
1436
1437 mutex_lock(&hv->hv_lock);
1438 eventfd = idr_remove(&hv->conn_to_evt, conn_id);
1439 mutex_unlock(&hv->hv_lock);
1440
1441 if (!eventfd)
1442 return -ENOENT;
1443
1444 synchronize_srcu(&kvm->srcu);
1445 eventfd_ctx_put(eventfd);
1446 return 0;
1447}
1448
1449int kvm_vm_ioctl_hv_eventfd(struct kvm *kvm, struct kvm_hyperv_eventfd *args)
1450{
1451 if ((args->flags & ~KVM_HYPERV_EVENTFD_DEASSIGN) ||
1452 (args->conn_id & ~KVM_HYPERV_CONN_ID_MASK))
1453 return -EINVAL;
1454
1455 if (args->flags == KVM_HYPERV_EVENTFD_DEASSIGN)
1456 return kvm_hv_eventfd_deassign(kvm, args->conn_id);
1457 return kvm_hv_eventfd_assign(kvm, args->conn_id, args->fd);
1458}