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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
36static inline u64 synic_read_sint(struct kvm_vcpu_hv_synic *synic, int sint)
37{
38 return atomic64_read(&synic->sint[sint]);
39}
40
41static 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
48static 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
60static 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
75static 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
107static 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
121static 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
147static 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
182static 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
196static 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
260static 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
294int 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
319int 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
330void 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
342static 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
357void 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
375static 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
387static u64 get_time_ref_counter(struct kvm *kvm)
388{
389 return div_u64(get_kernel_ns() + kvm->arch.kvmclock_offset, 100);
390}
391
392static 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
404static 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
418static 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 */
435static 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
489static 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
503static 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
519static int stimer_get_config(struct kvm_vcpu_hv_stimer *stimer, u64 *pconfig)
520{
521 *pconfig = stimer->config;
522 return 0;
523}
524
525static int stimer_get_count(struct kvm_vcpu_hv_stimer *stimer, u64 *pcount)
526{
527 *pcount = stimer->count;
528 return 0;
529}
530
531static 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
572static 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
585static 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
600void 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
629void 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
638static 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
653static 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
662void 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
674int 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
685static 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
704static 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
716static 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
724static 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
747static 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
759static 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 */
834static 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
842static 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
915static 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
952static 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
1015int 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
1028int 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
1041bool kvm_hv_hypercall_enabled(struct kvm *kvm)
1042{
1043 return kvm->arch.hyperv.hv_hypercall & HV_X64_MSR_HYPERCALL_ENABLE;
1044}
1045
1046static 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
1059static 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
1067int 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
1137set_result:
1138 ret = res | (((u64)rep_done & 0xfff) << 32);
1139 kvm_hv_hypercall_set_result(vcpu, ret);
1140 return 1;
1141}