Loading...
Note: File does not exist in v3.15.
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
294static 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
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 struct kvm_hv *hv = &kvm->arch.hyperv;
390 struct kvm_vcpu *vcpu;
391 u64 tsc;
392
393 /*
394 * The guest has not set up the TSC page or the clock isn't
395 * stable, fall back to get_kvmclock_ns.
396 */
397 if (!hv->tsc_ref.tsc_sequence)
398 return div_u64(get_kvmclock_ns(kvm), 100);
399
400 vcpu = kvm_get_vcpu(kvm, 0);
401 tsc = kvm_read_l1_tsc(vcpu, rdtsc());
402 return mul_u64_u64_shr(tsc, hv->tsc_ref.tsc_scale, 64)
403 + hv->tsc_ref.tsc_offset;
404}
405
406static void stimer_mark_pending(struct kvm_vcpu_hv_stimer *stimer,
407 bool vcpu_kick)
408{
409 struct kvm_vcpu *vcpu = stimer_to_vcpu(stimer);
410
411 set_bit(stimer->index,
412 vcpu_to_hv_vcpu(vcpu)->stimer_pending_bitmap);
413 kvm_make_request(KVM_REQ_HV_STIMER, vcpu);
414 if (vcpu_kick)
415 kvm_vcpu_kick(vcpu);
416}
417
418static void stimer_cleanup(struct kvm_vcpu_hv_stimer *stimer)
419{
420 struct kvm_vcpu *vcpu = stimer_to_vcpu(stimer);
421
422 trace_kvm_hv_stimer_cleanup(stimer_to_vcpu(stimer)->vcpu_id,
423 stimer->index);
424
425 hrtimer_cancel(&stimer->timer);
426 clear_bit(stimer->index,
427 vcpu_to_hv_vcpu(vcpu)->stimer_pending_bitmap);
428 stimer->msg_pending = false;
429 stimer->exp_time = 0;
430}
431
432static enum hrtimer_restart stimer_timer_callback(struct hrtimer *timer)
433{
434 struct kvm_vcpu_hv_stimer *stimer;
435
436 stimer = container_of(timer, struct kvm_vcpu_hv_stimer, timer);
437 trace_kvm_hv_stimer_callback(stimer_to_vcpu(stimer)->vcpu_id,
438 stimer->index);
439 stimer_mark_pending(stimer, true);
440
441 return HRTIMER_NORESTART;
442}
443
444/*
445 * stimer_start() assumptions:
446 * a) stimer->count is not equal to 0
447 * b) stimer->config has HV_STIMER_ENABLE flag
448 */
449static int stimer_start(struct kvm_vcpu_hv_stimer *stimer)
450{
451 u64 time_now;
452 ktime_t ktime_now;
453
454 time_now = get_time_ref_counter(stimer_to_vcpu(stimer)->kvm);
455 ktime_now = ktime_get();
456
457 if (stimer->config & HV_STIMER_PERIODIC) {
458 if (stimer->exp_time) {
459 if (time_now >= stimer->exp_time) {
460 u64 remainder;
461
462 div64_u64_rem(time_now - stimer->exp_time,
463 stimer->count, &remainder);
464 stimer->exp_time =
465 time_now + (stimer->count - remainder);
466 }
467 } else
468 stimer->exp_time = time_now + stimer->count;
469
470 trace_kvm_hv_stimer_start_periodic(
471 stimer_to_vcpu(stimer)->vcpu_id,
472 stimer->index,
473 time_now, stimer->exp_time);
474
475 hrtimer_start(&stimer->timer,
476 ktime_add_ns(ktime_now,
477 100 * (stimer->exp_time - time_now)),
478 HRTIMER_MODE_ABS);
479 return 0;
480 }
481 stimer->exp_time = stimer->count;
482 if (time_now >= stimer->count) {
483 /*
484 * Expire timer according to Hypervisor Top-Level Functional
485 * specification v4(15.3.1):
486 * "If a one shot is enabled and the specified count is in
487 * the past, it will expire immediately."
488 */
489 stimer_mark_pending(stimer, false);
490 return 0;
491 }
492
493 trace_kvm_hv_stimer_start_one_shot(stimer_to_vcpu(stimer)->vcpu_id,
494 stimer->index,
495 time_now, stimer->count);
496
497 hrtimer_start(&stimer->timer,
498 ktime_add_ns(ktime_now, 100 * (stimer->count - time_now)),
499 HRTIMER_MODE_ABS);
500 return 0;
501}
502
503static int stimer_set_config(struct kvm_vcpu_hv_stimer *stimer, u64 config,
504 bool host)
505{
506 trace_kvm_hv_stimer_set_config(stimer_to_vcpu(stimer)->vcpu_id,
507 stimer->index, config, host);
508
509 stimer_cleanup(stimer);
510 if ((stimer->config & HV_STIMER_ENABLE) && HV_STIMER_SINT(config) == 0)
511 config &= ~HV_STIMER_ENABLE;
512 stimer->config = config;
513 stimer_mark_pending(stimer, false);
514 return 0;
515}
516
517static int stimer_set_count(struct kvm_vcpu_hv_stimer *stimer, u64 count,
518 bool host)
519{
520 trace_kvm_hv_stimer_set_count(stimer_to_vcpu(stimer)->vcpu_id,
521 stimer->index, count, host);
522
523 stimer_cleanup(stimer);
524 stimer->count = count;
525 if (stimer->count == 0)
526 stimer->config &= ~HV_STIMER_ENABLE;
527 else if (stimer->config & HV_STIMER_AUTOENABLE)
528 stimer->config |= HV_STIMER_ENABLE;
529 stimer_mark_pending(stimer, false);
530 return 0;
531}
532
533static int stimer_get_config(struct kvm_vcpu_hv_stimer *stimer, u64 *pconfig)
534{
535 *pconfig = stimer->config;
536 return 0;
537}
538
539static int stimer_get_count(struct kvm_vcpu_hv_stimer *stimer, u64 *pcount)
540{
541 *pcount = stimer->count;
542 return 0;
543}
544
545static int synic_deliver_msg(struct kvm_vcpu_hv_synic *synic, u32 sint,
546 struct hv_message *src_msg)
547{
548 struct kvm_vcpu *vcpu = synic_to_vcpu(synic);
549 struct page *page;
550 gpa_t gpa;
551 struct hv_message *dst_msg;
552 int r;
553 struct hv_message_page *msg_page;
554
555 if (!(synic->msg_page & HV_SYNIC_SIMP_ENABLE))
556 return -ENOENT;
557
558 gpa = synic->msg_page & PAGE_MASK;
559 page = kvm_vcpu_gfn_to_page(vcpu, gpa >> PAGE_SHIFT);
560 if (is_error_page(page))
561 return -EFAULT;
562
563 msg_page = kmap_atomic(page);
564 dst_msg = &msg_page->sint_message[sint];
565 if (sync_cmpxchg(&dst_msg->header.message_type, HVMSG_NONE,
566 src_msg->header.message_type) != HVMSG_NONE) {
567 dst_msg->header.message_flags.msg_pending = 1;
568 r = -EAGAIN;
569 } else {
570 memcpy(&dst_msg->u.payload, &src_msg->u.payload,
571 src_msg->header.payload_size);
572 dst_msg->header.message_type = src_msg->header.message_type;
573 dst_msg->header.payload_size = src_msg->header.payload_size;
574 r = synic_set_irq(synic, sint);
575 if (r >= 1)
576 r = 0;
577 else if (r == 0)
578 r = -EFAULT;
579 }
580 kunmap_atomic(msg_page);
581 kvm_release_page_dirty(page);
582 kvm_vcpu_mark_page_dirty(vcpu, gpa >> PAGE_SHIFT);
583 return r;
584}
585
586static int stimer_send_msg(struct kvm_vcpu_hv_stimer *stimer)
587{
588 struct kvm_vcpu *vcpu = stimer_to_vcpu(stimer);
589 struct hv_message *msg = &stimer->msg;
590 struct hv_timer_message_payload *payload =
591 (struct hv_timer_message_payload *)&msg->u.payload;
592
593 payload->expiration_time = stimer->exp_time;
594 payload->delivery_time = get_time_ref_counter(vcpu->kvm);
595 return synic_deliver_msg(vcpu_to_synic(vcpu),
596 HV_STIMER_SINT(stimer->config), msg);
597}
598
599static void stimer_expiration(struct kvm_vcpu_hv_stimer *stimer)
600{
601 int r;
602
603 stimer->msg_pending = true;
604 r = stimer_send_msg(stimer);
605 trace_kvm_hv_stimer_expiration(stimer_to_vcpu(stimer)->vcpu_id,
606 stimer->index, r);
607 if (!r) {
608 stimer->msg_pending = false;
609 if (!(stimer->config & HV_STIMER_PERIODIC))
610 stimer->config &= ~HV_STIMER_ENABLE;
611 }
612}
613
614void kvm_hv_process_stimers(struct kvm_vcpu *vcpu)
615{
616 struct kvm_vcpu_hv *hv_vcpu = vcpu_to_hv_vcpu(vcpu);
617 struct kvm_vcpu_hv_stimer *stimer;
618 u64 time_now, exp_time;
619 int i;
620
621 for (i = 0; i < ARRAY_SIZE(hv_vcpu->stimer); i++)
622 if (test_and_clear_bit(i, hv_vcpu->stimer_pending_bitmap)) {
623 stimer = &hv_vcpu->stimer[i];
624 if (stimer->config & HV_STIMER_ENABLE) {
625 exp_time = stimer->exp_time;
626
627 if (exp_time) {
628 time_now =
629 get_time_ref_counter(vcpu->kvm);
630 if (time_now >= exp_time)
631 stimer_expiration(stimer);
632 }
633
634 if ((stimer->config & HV_STIMER_ENABLE) &&
635 stimer->count)
636 stimer_start(stimer);
637 else
638 stimer_cleanup(stimer);
639 }
640 }
641}
642
643void kvm_hv_vcpu_uninit(struct kvm_vcpu *vcpu)
644{
645 struct kvm_vcpu_hv *hv_vcpu = vcpu_to_hv_vcpu(vcpu);
646 int i;
647
648 for (i = 0; i < ARRAY_SIZE(hv_vcpu->stimer); i++)
649 stimer_cleanup(&hv_vcpu->stimer[i]);
650}
651
652static void stimer_prepare_msg(struct kvm_vcpu_hv_stimer *stimer)
653{
654 struct hv_message *msg = &stimer->msg;
655 struct hv_timer_message_payload *payload =
656 (struct hv_timer_message_payload *)&msg->u.payload;
657
658 memset(&msg->header, 0, sizeof(msg->header));
659 msg->header.message_type = HVMSG_TIMER_EXPIRED;
660 msg->header.payload_size = sizeof(*payload);
661
662 payload->timer_index = stimer->index;
663 payload->expiration_time = 0;
664 payload->delivery_time = 0;
665}
666
667static void stimer_init(struct kvm_vcpu_hv_stimer *stimer, int timer_index)
668{
669 memset(stimer, 0, sizeof(*stimer));
670 stimer->index = timer_index;
671 hrtimer_init(&stimer->timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
672 stimer->timer.function = stimer_timer_callback;
673 stimer_prepare_msg(stimer);
674}
675
676void kvm_hv_vcpu_init(struct kvm_vcpu *vcpu)
677{
678 struct kvm_vcpu_hv *hv_vcpu = vcpu_to_hv_vcpu(vcpu);
679 int i;
680
681 synic_init(&hv_vcpu->synic);
682
683 bitmap_zero(hv_vcpu->stimer_pending_bitmap, HV_SYNIC_STIMER_COUNT);
684 for (i = 0; i < ARRAY_SIZE(hv_vcpu->stimer); i++)
685 stimer_init(&hv_vcpu->stimer[i], i);
686}
687
688int kvm_hv_activate_synic(struct kvm_vcpu *vcpu)
689{
690 /*
691 * Hyper-V SynIC auto EOI SINT's are
692 * not compatible with APICV, so deactivate APICV
693 */
694 kvm_vcpu_deactivate_apicv(vcpu);
695 vcpu_to_synic(vcpu)->active = true;
696 return 0;
697}
698
699static bool kvm_hv_msr_partition_wide(u32 msr)
700{
701 bool r = false;
702
703 switch (msr) {
704 case HV_X64_MSR_GUEST_OS_ID:
705 case HV_X64_MSR_HYPERCALL:
706 case HV_X64_MSR_REFERENCE_TSC:
707 case HV_X64_MSR_TIME_REF_COUNT:
708 case HV_X64_MSR_CRASH_CTL:
709 case HV_X64_MSR_CRASH_P0 ... HV_X64_MSR_CRASH_P4:
710 case HV_X64_MSR_RESET:
711 r = true;
712 break;
713 }
714
715 return r;
716}
717
718static int kvm_hv_msr_get_crash_data(struct kvm_vcpu *vcpu,
719 u32 index, u64 *pdata)
720{
721 struct kvm_hv *hv = &vcpu->kvm->arch.hyperv;
722
723 if (WARN_ON_ONCE(index >= ARRAY_SIZE(hv->hv_crash_param)))
724 return -EINVAL;
725
726 *pdata = hv->hv_crash_param[index];
727 return 0;
728}
729
730static int kvm_hv_msr_get_crash_ctl(struct kvm_vcpu *vcpu, u64 *pdata)
731{
732 struct kvm_hv *hv = &vcpu->kvm->arch.hyperv;
733
734 *pdata = hv->hv_crash_ctl;
735 return 0;
736}
737
738static int kvm_hv_msr_set_crash_ctl(struct kvm_vcpu *vcpu, u64 data, bool host)
739{
740 struct kvm_hv *hv = &vcpu->kvm->arch.hyperv;
741
742 if (host)
743 hv->hv_crash_ctl = data & HV_X64_MSR_CRASH_CTL_NOTIFY;
744
745 if (!host && (data & HV_X64_MSR_CRASH_CTL_NOTIFY)) {
746
747 vcpu_debug(vcpu, "hv crash (0x%llx 0x%llx 0x%llx 0x%llx 0x%llx)\n",
748 hv->hv_crash_param[0],
749 hv->hv_crash_param[1],
750 hv->hv_crash_param[2],
751 hv->hv_crash_param[3],
752 hv->hv_crash_param[4]);
753
754 /* Send notification about crash to user space */
755 kvm_make_request(KVM_REQ_HV_CRASH, vcpu);
756 }
757
758 return 0;
759}
760
761static int kvm_hv_msr_set_crash_data(struct kvm_vcpu *vcpu,
762 u32 index, u64 data)
763{
764 struct kvm_hv *hv = &vcpu->kvm->arch.hyperv;
765
766 if (WARN_ON_ONCE(index >= ARRAY_SIZE(hv->hv_crash_param)))
767 return -EINVAL;
768
769 hv->hv_crash_param[index] = data;
770 return 0;
771}
772
773/*
774 * The kvmclock and Hyper-V TSC page use similar formulas, and converting
775 * between them is possible:
776 *
777 * kvmclock formula:
778 * nsec = (ticks - tsc_timestamp) * tsc_to_system_mul * 2^(tsc_shift-32)
779 * + system_time
780 *
781 * Hyper-V formula:
782 * nsec/100 = ticks * scale / 2^64 + offset
783 *
784 * When tsc_timestamp = system_time = 0, offset is zero in the Hyper-V formula.
785 * By dividing the kvmclock formula by 100 and equating what's left we get:
786 * ticks * scale / 2^64 = ticks * tsc_to_system_mul * 2^(tsc_shift-32) / 100
787 * scale / 2^64 = tsc_to_system_mul * 2^(tsc_shift-32) / 100
788 * scale = tsc_to_system_mul * 2^(32+tsc_shift) / 100
789 *
790 * Now expand the kvmclock formula and divide by 100:
791 * nsec = ticks * tsc_to_system_mul * 2^(tsc_shift-32)
792 * - tsc_timestamp * tsc_to_system_mul * 2^(tsc_shift-32)
793 * + system_time
794 * nsec/100 = ticks * tsc_to_system_mul * 2^(tsc_shift-32) / 100
795 * - tsc_timestamp * tsc_to_system_mul * 2^(tsc_shift-32) / 100
796 * + system_time / 100
797 *
798 * Replace tsc_to_system_mul * 2^(tsc_shift-32) / 100 by scale / 2^64:
799 * nsec/100 = ticks * scale / 2^64
800 * - tsc_timestamp * scale / 2^64
801 * + system_time / 100
802 *
803 * Equate with the Hyper-V formula so that ticks * scale / 2^64 cancels out:
804 * offset = system_time / 100 - tsc_timestamp * scale / 2^64
805 *
806 * These two equivalencies are implemented in this function.
807 */
808static bool compute_tsc_page_parameters(struct pvclock_vcpu_time_info *hv_clock,
809 HV_REFERENCE_TSC_PAGE *tsc_ref)
810{
811 u64 max_mul;
812
813 if (!(hv_clock->flags & PVCLOCK_TSC_STABLE_BIT))
814 return false;
815
816 /*
817 * check if scale would overflow, if so we use the time ref counter
818 * tsc_to_system_mul * 2^(tsc_shift+32) / 100 >= 2^64
819 * tsc_to_system_mul / 100 >= 2^(32-tsc_shift)
820 * tsc_to_system_mul >= 100 * 2^(32-tsc_shift)
821 */
822 max_mul = 100ull << (32 - hv_clock->tsc_shift);
823 if (hv_clock->tsc_to_system_mul >= max_mul)
824 return false;
825
826 /*
827 * Otherwise compute the scale and offset according to the formulas
828 * derived above.
829 */
830 tsc_ref->tsc_scale =
831 mul_u64_u32_div(1ULL << (32 + hv_clock->tsc_shift),
832 hv_clock->tsc_to_system_mul,
833 100);
834
835 tsc_ref->tsc_offset = hv_clock->system_time;
836 do_div(tsc_ref->tsc_offset, 100);
837 tsc_ref->tsc_offset -=
838 mul_u64_u64_shr(hv_clock->tsc_timestamp, tsc_ref->tsc_scale, 64);
839 return true;
840}
841
842void kvm_hv_setup_tsc_page(struct kvm *kvm,
843 struct pvclock_vcpu_time_info *hv_clock)
844{
845 struct kvm_hv *hv = &kvm->arch.hyperv;
846 u32 tsc_seq;
847 u64 gfn;
848
849 BUILD_BUG_ON(sizeof(tsc_seq) != sizeof(hv->tsc_ref.tsc_sequence));
850 BUILD_BUG_ON(offsetof(HV_REFERENCE_TSC_PAGE, tsc_sequence) != 0);
851
852 if (!(hv->hv_tsc_page & HV_X64_MSR_TSC_REFERENCE_ENABLE))
853 return;
854
855 mutex_lock(&kvm->arch.hyperv.hv_lock);
856 if (!(hv->hv_tsc_page & HV_X64_MSR_TSC_REFERENCE_ENABLE))
857 goto out_unlock;
858
859 gfn = hv->hv_tsc_page >> HV_X64_MSR_TSC_REFERENCE_ADDRESS_SHIFT;
860 /*
861 * Because the TSC parameters only vary when there is a
862 * change in the master clock, do not bother with caching.
863 */
864 if (unlikely(kvm_read_guest(kvm, gfn_to_gpa(gfn),
865 &tsc_seq, sizeof(tsc_seq))))
866 goto out_unlock;
867
868 /*
869 * While we're computing and writing the parameters, force the
870 * guest to use the time reference count MSR.
871 */
872 hv->tsc_ref.tsc_sequence = 0;
873 if (kvm_write_guest(kvm, gfn_to_gpa(gfn),
874 &hv->tsc_ref, sizeof(hv->tsc_ref.tsc_sequence)))
875 goto out_unlock;
876
877 if (!compute_tsc_page_parameters(hv_clock, &hv->tsc_ref))
878 goto out_unlock;
879
880 /* Ensure sequence is zero before writing the rest of the struct. */
881 smp_wmb();
882 if (kvm_write_guest(kvm, gfn_to_gpa(gfn), &hv->tsc_ref, sizeof(hv->tsc_ref)))
883 goto out_unlock;
884
885 /*
886 * Now switch to the TSC page mechanism by writing the sequence.
887 */
888 tsc_seq++;
889 if (tsc_seq == 0xFFFFFFFF || tsc_seq == 0)
890 tsc_seq = 1;
891
892 /* Write the struct entirely before the non-zero sequence. */
893 smp_wmb();
894
895 hv->tsc_ref.tsc_sequence = tsc_seq;
896 kvm_write_guest(kvm, gfn_to_gpa(gfn),
897 &hv->tsc_ref, sizeof(hv->tsc_ref.tsc_sequence));
898out_unlock:
899 mutex_unlock(&kvm->arch.hyperv.hv_lock);
900}
901
902static int kvm_hv_set_msr_pw(struct kvm_vcpu *vcpu, u32 msr, u64 data,
903 bool host)
904{
905 struct kvm *kvm = vcpu->kvm;
906 struct kvm_hv *hv = &kvm->arch.hyperv;
907
908 switch (msr) {
909 case HV_X64_MSR_GUEST_OS_ID:
910 hv->hv_guest_os_id = data;
911 /* setting guest os id to zero disables hypercall page */
912 if (!hv->hv_guest_os_id)
913 hv->hv_hypercall &= ~HV_X64_MSR_HYPERCALL_ENABLE;
914 break;
915 case HV_X64_MSR_HYPERCALL: {
916 u64 gfn;
917 unsigned long addr;
918 u8 instructions[4];
919
920 /* if guest os id is not set hypercall should remain disabled */
921 if (!hv->hv_guest_os_id)
922 break;
923 if (!(data & HV_X64_MSR_HYPERCALL_ENABLE)) {
924 hv->hv_hypercall = data;
925 break;
926 }
927 gfn = data >> HV_X64_MSR_HYPERCALL_PAGE_ADDRESS_SHIFT;
928 addr = gfn_to_hva(kvm, gfn);
929 if (kvm_is_error_hva(addr))
930 return 1;
931 kvm_x86_ops->patch_hypercall(vcpu, instructions);
932 ((unsigned char *)instructions)[3] = 0xc3; /* ret */
933 if (__copy_to_user((void __user *)addr, instructions, 4))
934 return 1;
935 hv->hv_hypercall = data;
936 mark_page_dirty(kvm, gfn);
937 break;
938 }
939 case HV_X64_MSR_REFERENCE_TSC:
940 hv->hv_tsc_page = data;
941 if (hv->hv_tsc_page & HV_X64_MSR_TSC_REFERENCE_ENABLE)
942 kvm_make_request(KVM_REQ_MASTERCLOCK_UPDATE, vcpu);
943 break;
944 case HV_X64_MSR_CRASH_P0 ... HV_X64_MSR_CRASH_P4:
945 return kvm_hv_msr_set_crash_data(vcpu,
946 msr - HV_X64_MSR_CRASH_P0,
947 data);
948 case HV_X64_MSR_CRASH_CTL:
949 return kvm_hv_msr_set_crash_ctl(vcpu, data, host);
950 case HV_X64_MSR_RESET:
951 if (data == 1) {
952 vcpu_debug(vcpu, "hyper-v reset requested\n");
953 kvm_make_request(KVM_REQ_HV_RESET, vcpu);
954 }
955 break;
956 default:
957 vcpu_unimpl(vcpu, "Hyper-V uhandled wrmsr: 0x%x data 0x%llx\n",
958 msr, data);
959 return 1;
960 }
961 return 0;
962}
963
964/* Calculate cpu time spent by current task in 100ns units */
965static u64 current_task_runtime_100ns(void)
966{
967 cputime_t utime, stime;
968
969 task_cputime_adjusted(current, &utime, &stime);
970 return div_u64(cputime_to_nsecs(utime + stime), 100);
971}
972
973static int kvm_hv_set_msr(struct kvm_vcpu *vcpu, u32 msr, u64 data, bool host)
974{
975 struct kvm_vcpu_hv *hv = &vcpu->arch.hyperv;
976
977 switch (msr) {
978 case HV_X64_MSR_APIC_ASSIST_PAGE: {
979 u64 gfn;
980 unsigned long addr;
981
982 if (!(data & HV_X64_MSR_APIC_ASSIST_PAGE_ENABLE)) {
983 hv->hv_vapic = data;
984 if (kvm_lapic_enable_pv_eoi(vcpu, 0))
985 return 1;
986 break;
987 }
988 gfn = data >> HV_X64_MSR_APIC_ASSIST_PAGE_ADDRESS_SHIFT;
989 addr = kvm_vcpu_gfn_to_hva(vcpu, gfn);
990 if (kvm_is_error_hva(addr))
991 return 1;
992 if (__clear_user((void __user *)addr, PAGE_SIZE))
993 return 1;
994 hv->hv_vapic = data;
995 kvm_vcpu_mark_page_dirty(vcpu, gfn);
996 if (kvm_lapic_enable_pv_eoi(vcpu,
997 gfn_to_gpa(gfn) | KVM_MSR_ENABLED))
998 return 1;
999 break;
1000 }
1001 case HV_X64_MSR_EOI:
1002 return kvm_hv_vapic_msr_write(vcpu, APIC_EOI, data);
1003 case HV_X64_MSR_ICR:
1004 return kvm_hv_vapic_msr_write(vcpu, APIC_ICR, data);
1005 case HV_X64_MSR_TPR:
1006 return kvm_hv_vapic_msr_write(vcpu, APIC_TASKPRI, data);
1007 case HV_X64_MSR_VP_RUNTIME:
1008 if (!host)
1009 return 1;
1010 hv->runtime_offset = data - current_task_runtime_100ns();
1011 break;
1012 case HV_X64_MSR_SCONTROL:
1013 case HV_X64_MSR_SVERSION:
1014 case HV_X64_MSR_SIEFP:
1015 case HV_X64_MSR_SIMP:
1016 case HV_X64_MSR_EOM:
1017 case HV_X64_MSR_SINT0 ... HV_X64_MSR_SINT15:
1018 return synic_set_msr(vcpu_to_synic(vcpu), msr, data, host);
1019 case HV_X64_MSR_STIMER0_CONFIG:
1020 case HV_X64_MSR_STIMER1_CONFIG:
1021 case HV_X64_MSR_STIMER2_CONFIG:
1022 case HV_X64_MSR_STIMER3_CONFIG: {
1023 int timer_index = (msr - HV_X64_MSR_STIMER0_CONFIG)/2;
1024
1025 return stimer_set_config(vcpu_to_stimer(vcpu, timer_index),
1026 data, host);
1027 }
1028 case HV_X64_MSR_STIMER0_COUNT:
1029 case HV_X64_MSR_STIMER1_COUNT:
1030 case HV_X64_MSR_STIMER2_COUNT:
1031 case HV_X64_MSR_STIMER3_COUNT: {
1032 int timer_index = (msr - HV_X64_MSR_STIMER0_COUNT)/2;
1033
1034 return stimer_set_count(vcpu_to_stimer(vcpu, timer_index),
1035 data, host);
1036 }
1037 default:
1038 vcpu_unimpl(vcpu, "Hyper-V uhandled wrmsr: 0x%x data 0x%llx\n",
1039 msr, data);
1040 return 1;
1041 }
1042
1043 return 0;
1044}
1045
1046static int kvm_hv_get_msr_pw(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1047{
1048 u64 data = 0;
1049 struct kvm *kvm = vcpu->kvm;
1050 struct kvm_hv *hv = &kvm->arch.hyperv;
1051
1052 switch (msr) {
1053 case HV_X64_MSR_GUEST_OS_ID:
1054 data = hv->hv_guest_os_id;
1055 break;
1056 case HV_X64_MSR_HYPERCALL:
1057 data = hv->hv_hypercall;
1058 break;
1059 case HV_X64_MSR_TIME_REF_COUNT:
1060 data = get_time_ref_counter(kvm);
1061 break;
1062 case HV_X64_MSR_REFERENCE_TSC:
1063 data = hv->hv_tsc_page;
1064 break;
1065 case HV_X64_MSR_CRASH_P0 ... HV_X64_MSR_CRASH_P4:
1066 return kvm_hv_msr_get_crash_data(vcpu,
1067 msr - HV_X64_MSR_CRASH_P0,
1068 pdata);
1069 case HV_X64_MSR_CRASH_CTL:
1070 return kvm_hv_msr_get_crash_ctl(vcpu, pdata);
1071 case HV_X64_MSR_RESET:
1072 data = 0;
1073 break;
1074 default:
1075 vcpu_unimpl(vcpu, "Hyper-V unhandled rdmsr: 0x%x\n", msr);
1076 return 1;
1077 }
1078
1079 *pdata = data;
1080 return 0;
1081}
1082
1083static int kvm_hv_get_msr(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1084{
1085 u64 data = 0;
1086 struct kvm_vcpu_hv *hv = &vcpu->arch.hyperv;
1087
1088 switch (msr) {
1089 case HV_X64_MSR_VP_INDEX: {
1090 int r;
1091 struct kvm_vcpu *v;
1092
1093 kvm_for_each_vcpu(r, v, vcpu->kvm) {
1094 if (v == vcpu) {
1095 data = r;
1096 break;
1097 }
1098 }
1099 break;
1100 }
1101 case HV_X64_MSR_EOI:
1102 return kvm_hv_vapic_msr_read(vcpu, APIC_EOI, pdata);
1103 case HV_X64_MSR_ICR:
1104 return kvm_hv_vapic_msr_read(vcpu, APIC_ICR, pdata);
1105 case HV_X64_MSR_TPR:
1106 return kvm_hv_vapic_msr_read(vcpu, APIC_TASKPRI, pdata);
1107 case HV_X64_MSR_APIC_ASSIST_PAGE:
1108 data = hv->hv_vapic;
1109 break;
1110 case HV_X64_MSR_VP_RUNTIME:
1111 data = current_task_runtime_100ns() + hv->runtime_offset;
1112 break;
1113 case HV_X64_MSR_SCONTROL:
1114 case HV_X64_MSR_SVERSION:
1115 case HV_X64_MSR_SIEFP:
1116 case HV_X64_MSR_SIMP:
1117 case HV_X64_MSR_EOM:
1118 case HV_X64_MSR_SINT0 ... HV_X64_MSR_SINT15:
1119 return synic_get_msr(vcpu_to_synic(vcpu), msr, pdata);
1120 case HV_X64_MSR_STIMER0_CONFIG:
1121 case HV_X64_MSR_STIMER1_CONFIG:
1122 case HV_X64_MSR_STIMER2_CONFIG:
1123 case HV_X64_MSR_STIMER3_CONFIG: {
1124 int timer_index = (msr - HV_X64_MSR_STIMER0_CONFIG)/2;
1125
1126 return stimer_get_config(vcpu_to_stimer(vcpu, timer_index),
1127 pdata);
1128 }
1129 case HV_X64_MSR_STIMER0_COUNT:
1130 case HV_X64_MSR_STIMER1_COUNT:
1131 case HV_X64_MSR_STIMER2_COUNT:
1132 case HV_X64_MSR_STIMER3_COUNT: {
1133 int timer_index = (msr - HV_X64_MSR_STIMER0_COUNT)/2;
1134
1135 return stimer_get_count(vcpu_to_stimer(vcpu, timer_index),
1136 pdata);
1137 }
1138 default:
1139 vcpu_unimpl(vcpu, "Hyper-V unhandled rdmsr: 0x%x\n", msr);
1140 return 1;
1141 }
1142 *pdata = data;
1143 return 0;
1144}
1145
1146int kvm_hv_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data, bool host)
1147{
1148 if (kvm_hv_msr_partition_wide(msr)) {
1149 int r;
1150
1151 mutex_lock(&vcpu->kvm->arch.hyperv.hv_lock);
1152 r = kvm_hv_set_msr_pw(vcpu, msr, data, host);
1153 mutex_unlock(&vcpu->kvm->arch.hyperv.hv_lock);
1154 return r;
1155 } else
1156 return kvm_hv_set_msr(vcpu, msr, data, host);
1157}
1158
1159int kvm_hv_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1160{
1161 if (kvm_hv_msr_partition_wide(msr)) {
1162 int r;
1163
1164 mutex_lock(&vcpu->kvm->arch.hyperv.hv_lock);
1165 r = kvm_hv_get_msr_pw(vcpu, msr, pdata);
1166 mutex_unlock(&vcpu->kvm->arch.hyperv.hv_lock);
1167 return r;
1168 } else
1169 return kvm_hv_get_msr(vcpu, msr, pdata);
1170}
1171
1172bool kvm_hv_hypercall_enabled(struct kvm *kvm)
1173{
1174 return READ_ONCE(kvm->arch.hyperv.hv_hypercall) & HV_X64_MSR_HYPERCALL_ENABLE;
1175}
1176
1177static void kvm_hv_hypercall_set_result(struct kvm_vcpu *vcpu, u64 result)
1178{
1179 bool longmode;
1180
1181 longmode = is_64_bit_mode(vcpu);
1182 if (longmode)
1183 kvm_register_write(vcpu, VCPU_REGS_RAX, result);
1184 else {
1185 kvm_register_write(vcpu, VCPU_REGS_RDX, result >> 32);
1186 kvm_register_write(vcpu, VCPU_REGS_RAX, result & 0xffffffff);
1187 }
1188}
1189
1190static int kvm_hv_hypercall_complete_userspace(struct kvm_vcpu *vcpu)
1191{
1192 struct kvm_run *run = vcpu->run;
1193
1194 kvm_hv_hypercall_set_result(vcpu, run->hyperv.u.hcall.result);
1195 return 1;
1196}
1197
1198int kvm_hv_hypercall(struct kvm_vcpu *vcpu)
1199{
1200 u64 param, ingpa, outgpa, ret;
1201 uint16_t code, rep_idx, rep_cnt, res = HV_STATUS_SUCCESS, rep_done = 0;
1202 bool fast, longmode;
1203
1204 /*
1205 * hypercall generates UD from non zero cpl and real mode
1206 * per HYPER-V spec
1207 */
1208 if (kvm_x86_ops->get_cpl(vcpu) != 0 || !is_protmode(vcpu)) {
1209 kvm_queue_exception(vcpu, UD_VECTOR);
1210 return 1;
1211 }
1212
1213 longmode = is_64_bit_mode(vcpu);
1214
1215 if (!longmode) {
1216 param = ((u64)kvm_register_read(vcpu, VCPU_REGS_RDX) << 32) |
1217 (kvm_register_read(vcpu, VCPU_REGS_RAX) & 0xffffffff);
1218 ingpa = ((u64)kvm_register_read(vcpu, VCPU_REGS_RBX) << 32) |
1219 (kvm_register_read(vcpu, VCPU_REGS_RCX) & 0xffffffff);
1220 outgpa = ((u64)kvm_register_read(vcpu, VCPU_REGS_RDI) << 32) |
1221 (kvm_register_read(vcpu, VCPU_REGS_RSI) & 0xffffffff);
1222 }
1223#ifdef CONFIG_X86_64
1224 else {
1225 param = kvm_register_read(vcpu, VCPU_REGS_RCX);
1226 ingpa = kvm_register_read(vcpu, VCPU_REGS_RDX);
1227 outgpa = kvm_register_read(vcpu, VCPU_REGS_R8);
1228 }
1229#endif
1230
1231 code = param & 0xffff;
1232 fast = (param >> 16) & 0x1;
1233 rep_cnt = (param >> 32) & 0xfff;
1234 rep_idx = (param >> 48) & 0xfff;
1235
1236 trace_kvm_hv_hypercall(code, fast, rep_cnt, rep_idx, ingpa, outgpa);
1237
1238 /* Hypercall continuation is not supported yet */
1239 if (rep_cnt || rep_idx) {
1240 res = HV_STATUS_INVALID_HYPERCALL_CODE;
1241 goto set_result;
1242 }
1243
1244 switch (code) {
1245 case HVCALL_NOTIFY_LONG_SPIN_WAIT:
1246 kvm_vcpu_on_spin(vcpu);
1247 break;
1248 case HVCALL_POST_MESSAGE:
1249 case HVCALL_SIGNAL_EVENT:
1250 /* don't bother userspace if it has no way to handle it */
1251 if (!vcpu_to_synic(vcpu)->active) {
1252 res = HV_STATUS_INVALID_HYPERCALL_CODE;
1253 break;
1254 }
1255 vcpu->run->exit_reason = KVM_EXIT_HYPERV;
1256 vcpu->run->hyperv.type = KVM_EXIT_HYPERV_HCALL;
1257 vcpu->run->hyperv.u.hcall.input = param;
1258 vcpu->run->hyperv.u.hcall.params[0] = ingpa;
1259 vcpu->run->hyperv.u.hcall.params[1] = outgpa;
1260 vcpu->arch.complete_userspace_io =
1261 kvm_hv_hypercall_complete_userspace;
1262 return 0;
1263 default:
1264 res = HV_STATUS_INVALID_HYPERCALL_CODE;
1265 break;
1266 }
1267
1268set_result:
1269 ret = res | (((u64)rep_done & 0xfff) << 32);
1270 kvm_hv_hypercall_set_result(vcpu, ret);
1271 return 1;
1272}