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[mirror_ubuntu-bionic-kernel.git] / arch / x86 / kvm / hyperv.c
1 /*
2 * KVM Microsoft Hyper-V emulation
3 *
4 * derived from arch/x86/kvm/x86.c
5 *
6 * Copyright (C) 2006 Qumranet, Inc.
7 * Copyright (C) 2008 Qumranet, Inc.
8 * Copyright IBM Corporation, 2008
9 * Copyright 2010 Red Hat, Inc. and/or its affiliates.
10 * Copyright (C) 2015 Andrey Smetanin <asmetanin@virtuozzo.com>
11 *
12 * Authors:
13 * Avi Kivity <avi@qumranet.com>
14 * Yaniv Kamay <yaniv@qumranet.com>
15 * Amit Shah <amit.shah@qumranet.com>
16 * Ben-Ami Yassour <benami@il.ibm.com>
17 * Andrey Smetanin <asmetanin@virtuozzo.com>
18 *
19 * This work is licensed under the terms of the GNU GPL, version 2. See
20 * the COPYING file in the top-level directory.
21 *
22 */
23
24 #include "x86.h"
25 #include "lapic.h"
26 #include "ioapic.h"
27 #include "hyperv.h"
28
29 #include <linux/kvm_host.h>
30 #include <linux/highmem.h>
31 #include <asm/apicdef.h>
32 #include <trace/events/kvm.h>
33
34 #include "trace.h"
35
36 static inline u64 synic_read_sint(struct kvm_vcpu_hv_synic *synic, int sint)
37 {
38 return atomic64_read(&synic->sint[sint]);
39 }
40
41 static inline int synic_get_sint_vector(u64 sint_value)
42 {
43 if (sint_value & HV_SYNIC_SINT_MASKED)
44 return -1;
45 return sint_value & HV_SYNIC_SINT_VECTOR_MASK;
46 }
47
48 static bool synic_has_vector_connected(struct kvm_vcpu_hv_synic *synic,
49 int vector)
50 {
51 int i;
52
53 for (i = 0; i < ARRAY_SIZE(synic->sint); i++) {
54 if (synic_get_sint_vector(synic_read_sint(synic, i)) == vector)
55 return true;
56 }
57 return false;
58 }
59
60 static bool synic_has_vector_auto_eoi(struct kvm_vcpu_hv_synic *synic,
61 int vector)
62 {
63 int i;
64 u64 sint_value;
65
66 for (i = 0; i < ARRAY_SIZE(synic->sint); i++) {
67 sint_value = synic_read_sint(synic, i);
68 if (synic_get_sint_vector(sint_value) == vector &&
69 sint_value & HV_SYNIC_SINT_AUTO_EOI)
70 return true;
71 }
72 return false;
73 }
74
75 static int synic_set_sint(struct kvm_vcpu_hv_synic *synic, int sint,
76 u64 data, bool host)
77 {
78 int vector;
79
80 vector = data & HV_SYNIC_SINT_VECTOR_MASK;
81 if (vector < 16 && !host)
82 return 1;
83 /*
84 * Guest may configure multiple SINTs to use the same vector, so
85 * we maintain a bitmap of vectors handled by synic, and a
86 * bitmap of vectors with auto-eoi behavior. The bitmaps are
87 * updated here, and atomically queried on fast paths.
88 */
89
90 atomic64_set(&synic->sint[sint], data);
91
92 if (synic_has_vector_connected(synic, vector))
93 __set_bit(vector, synic->vec_bitmap);
94 else
95 __clear_bit(vector, synic->vec_bitmap);
96
97 if (synic_has_vector_auto_eoi(synic, vector))
98 __set_bit(vector, synic->auto_eoi_bitmap);
99 else
100 __clear_bit(vector, synic->auto_eoi_bitmap);
101
102 /* Load SynIC vectors into EOI exit bitmap */
103 kvm_make_request(KVM_REQ_SCAN_IOAPIC, synic_to_vcpu(synic));
104 return 0;
105 }
106
107 static struct kvm_vcpu_hv_synic *synic_get(struct kvm *kvm, u32 vcpu_id)
108 {
109 struct kvm_vcpu *vcpu;
110 struct kvm_vcpu_hv_synic *synic;
111
112 if (vcpu_id >= atomic_read(&kvm->online_vcpus))
113 return NULL;
114 vcpu = kvm_get_vcpu(kvm, vcpu_id);
115 if (!vcpu)
116 return NULL;
117 synic = vcpu_to_synic(vcpu);
118 return (synic->active) ? synic : NULL;
119 }
120
121 static void synic_clear_sint_msg_pending(struct kvm_vcpu_hv_synic *synic,
122 u32 sint)
123 {
124 struct kvm_vcpu *vcpu = synic_to_vcpu(synic);
125 struct page *page;
126 gpa_t gpa;
127 struct hv_message *msg;
128 struct hv_message_page *msg_page;
129
130 gpa = synic->msg_page & PAGE_MASK;
131 page = kvm_vcpu_gfn_to_page(vcpu, gpa >> PAGE_SHIFT);
132 if (is_error_page(page)) {
133 vcpu_err(vcpu, "Hyper-V SynIC can't get msg page, gpa 0x%llx\n",
134 gpa);
135 return;
136 }
137 msg_page = kmap_atomic(page);
138
139 msg = &msg_page->sint_message[sint];
140 msg->header.message_flags.msg_pending = 0;
141
142 kunmap_atomic(msg_page);
143 kvm_release_page_dirty(page);
144 kvm_vcpu_mark_page_dirty(vcpu, gpa >> PAGE_SHIFT);
145 }
146
147 static void kvm_hv_notify_acked_sint(struct kvm_vcpu *vcpu, u32 sint)
148 {
149 struct kvm *kvm = vcpu->kvm;
150 struct kvm_vcpu_hv_synic *synic = vcpu_to_synic(vcpu);
151 struct kvm_vcpu_hv *hv_vcpu = vcpu_to_hv_vcpu(vcpu);
152 struct kvm_vcpu_hv_stimer *stimer;
153 int gsi, idx, stimers_pending;
154
155 trace_kvm_hv_notify_acked_sint(vcpu->vcpu_id, sint);
156
157 if (synic->msg_page & HV_SYNIC_SIMP_ENABLE)
158 synic_clear_sint_msg_pending(synic, sint);
159
160 /* Try to deliver pending Hyper-V SynIC timers messages */
161 stimers_pending = 0;
162 for (idx = 0; idx < ARRAY_SIZE(hv_vcpu->stimer); idx++) {
163 stimer = &hv_vcpu->stimer[idx];
164 if (stimer->msg_pending &&
165 (stimer->config & HV_STIMER_ENABLE) &&
166 HV_STIMER_SINT(stimer->config) == sint) {
167 set_bit(stimer->index,
168 hv_vcpu->stimer_pending_bitmap);
169 stimers_pending++;
170 }
171 }
172 if (stimers_pending)
173 kvm_make_request(KVM_REQ_HV_STIMER, vcpu);
174
175 idx = srcu_read_lock(&kvm->irq_srcu);
176 gsi = atomic_read(&synic->sint_to_gsi[sint]);
177 if (gsi != -1)
178 kvm_notify_acked_gsi(kvm, gsi);
179 srcu_read_unlock(&kvm->irq_srcu, idx);
180 }
181
182 static void synic_exit(struct kvm_vcpu_hv_synic *synic, u32 msr)
183 {
184 struct kvm_vcpu *vcpu = synic_to_vcpu(synic);
185 struct kvm_vcpu_hv *hv_vcpu = &vcpu->arch.hyperv;
186
187 hv_vcpu->exit.type = KVM_EXIT_HYPERV_SYNIC;
188 hv_vcpu->exit.u.synic.msr = msr;
189 hv_vcpu->exit.u.synic.control = synic->control;
190 hv_vcpu->exit.u.synic.evt_page = synic->evt_page;
191 hv_vcpu->exit.u.synic.msg_page = synic->msg_page;
192
193 kvm_make_request(KVM_REQ_HV_EXIT, vcpu);
194 }
195
196 static int synic_set_msr(struct kvm_vcpu_hv_synic *synic,
197 u32 msr, u64 data, bool host)
198 {
199 struct kvm_vcpu *vcpu = synic_to_vcpu(synic);
200 int ret;
201
202 if (!synic->active)
203 return 1;
204
205 trace_kvm_hv_synic_set_msr(vcpu->vcpu_id, msr, data, host);
206
207 ret = 0;
208 switch (msr) {
209 case HV_X64_MSR_SCONTROL:
210 synic->control = data;
211 if (!host)
212 synic_exit(synic, msr);
213 break;
214 case HV_X64_MSR_SVERSION:
215 if (!host) {
216 ret = 1;
217 break;
218 }
219 synic->version = data;
220 break;
221 case HV_X64_MSR_SIEFP:
222 if (data & HV_SYNIC_SIEFP_ENABLE)
223 if (kvm_clear_guest(vcpu->kvm,
224 data & PAGE_MASK, PAGE_SIZE)) {
225 ret = 1;
226 break;
227 }
228 synic->evt_page = data;
229 if (!host)
230 synic_exit(synic, msr);
231 break;
232 case HV_X64_MSR_SIMP:
233 if (data & HV_SYNIC_SIMP_ENABLE)
234 if (kvm_clear_guest(vcpu->kvm,
235 data & PAGE_MASK, PAGE_SIZE)) {
236 ret = 1;
237 break;
238 }
239 synic->msg_page = data;
240 if (!host)
241 synic_exit(synic, msr);
242 break;
243 case HV_X64_MSR_EOM: {
244 int i;
245
246 for (i = 0; i < ARRAY_SIZE(synic->sint); i++)
247 kvm_hv_notify_acked_sint(vcpu, i);
248 break;
249 }
250 case HV_X64_MSR_SINT0 ... HV_X64_MSR_SINT15:
251 ret = synic_set_sint(synic, msr - HV_X64_MSR_SINT0, data, host);
252 break;
253 default:
254 ret = 1;
255 break;
256 }
257 return ret;
258 }
259
260 static int synic_get_msr(struct kvm_vcpu_hv_synic *synic, u32 msr, u64 *pdata)
261 {
262 int ret;
263
264 if (!synic->active)
265 return 1;
266
267 ret = 0;
268 switch (msr) {
269 case HV_X64_MSR_SCONTROL:
270 *pdata = synic->control;
271 break;
272 case HV_X64_MSR_SVERSION:
273 *pdata = synic->version;
274 break;
275 case HV_X64_MSR_SIEFP:
276 *pdata = synic->evt_page;
277 break;
278 case HV_X64_MSR_SIMP:
279 *pdata = synic->msg_page;
280 break;
281 case HV_X64_MSR_EOM:
282 *pdata = 0;
283 break;
284 case HV_X64_MSR_SINT0 ... HV_X64_MSR_SINT15:
285 *pdata = atomic64_read(&synic->sint[msr - HV_X64_MSR_SINT0]);
286 break;
287 default:
288 ret = 1;
289 break;
290 }
291 return ret;
292 }
293
294 int synic_set_irq(struct kvm_vcpu_hv_synic *synic, u32 sint)
295 {
296 struct kvm_vcpu *vcpu = synic_to_vcpu(synic);
297 struct kvm_lapic_irq irq;
298 int ret, vector;
299
300 if (sint >= ARRAY_SIZE(synic->sint))
301 return -EINVAL;
302
303 vector = synic_get_sint_vector(synic_read_sint(synic, sint));
304 if (vector < 0)
305 return -ENOENT;
306
307 memset(&irq, 0, sizeof(irq));
308 irq.dest_id = kvm_apic_id(vcpu->arch.apic);
309 irq.dest_mode = APIC_DEST_PHYSICAL;
310 irq.delivery_mode = APIC_DM_FIXED;
311 irq.vector = vector;
312 irq.level = 1;
313
314 ret = kvm_irq_delivery_to_apic(vcpu->kvm, NULL, &irq, NULL);
315 trace_kvm_hv_synic_set_irq(vcpu->vcpu_id, sint, irq.vector, ret);
316 return ret;
317 }
318
319 int kvm_hv_synic_set_irq(struct kvm *kvm, u32 vcpu_id, u32 sint)
320 {
321 struct kvm_vcpu_hv_synic *synic;
322
323 synic = synic_get(kvm, vcpu_id);
324 if (!synic)
325 return -EINVAL;
326
327 return synic_set_irq(synic, sint);
328 }
329
330 void kvm_hv_synic_send_eoi(struct kvm_vcpu *vcpu, int vector)
331 {
332 struct kvm_vcpu_hv_synic *synic = vcpu_to_synic(vcpu);
333 int i;
334
335 trace_kvm_hv_synic_send_eoi(vcpu->vcpu_id, vector);
336
337 for (i = 0; i < ARRAY_SIZE(synic->sint); i++)
338 if (synic_get_sint_vector(synic_read_sint(synic, i)) == vector)
339 kvm_hv_notify_acked_sint(vcpu, i);
340 }
341
342 static int kvm_hv_set_sint_gsi(struct kvm *kvm, u32 vcpu_id, u32 sint, int gsi)
343 {
344 struct kvm_vcpu_hv_synic *synic;
345
346 synic = synic_get(kvm, vcpu_id);
347 if (!synic)
348 return -EINVAL;
349
350 if (sint >= ARRAY_SIZE(synic->sint_to_gsi))
351 return -EINVAL;
352
353 atomic_set(&synic->sint_to_gsi[sint], gsi);
354 return 0;
355 }
356
357 void kvm_hv_irq_routing_update(struct kvm *kvm)
358 {
359 struct kvm_irq_routing_table *irq_rt;
360 struct kvm_kernel_irq_routing_entry *e;
361 u32 gsi;
362
363 irq_rt = srcu_dereference_check(kvm->irq_routing, &kvm->irq_srcu,
364 lockdep_is_held(&kvm->irq_lock));
365
366 for (gsi = 0; gsi < irq_rt->nr_rt_entries; gsi++) {
367 hlist_for_each_entry(e, &irq_rt->map[gsi], link) {
368 if (e->type == KVM_IRQ_ROUTING_HV_SINT)
369 kvm_hv_set_sint_gsi(kvm, e->hv_sint.vcpu,
370 e->hv_sint.sint, gsi);
371 }
372 }
373 }
374
375 static void synic_init(struct kvm_vcpu_hv_synic *synic)
376 {
377 int i;
378
379 memset(synic, 0, sizeof(*synic));
380 synic->version = HV_SYNIC_VERSION_1;
381 for (i = 0; i < ARRAY_SIZE(synic->sint); i++) {
382 atomic64_set(&synic->sint[i], HV_SYNIC_SINT_MASKED);
383 atomic_set(&synic->sint_to_gsi[i], -1);
384 }
385 }
386
387 static u64 get_time_ref_counter(struct kvm *kvm)
388 {
389 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
406 static 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
418 static 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
432 static 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 */
449 static 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
503 static 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
517 static 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
533 static int stimer_get_config(struct kvm_vcpu_hv_stimer *stimer, u64 *pconfig)
534 {
535 *pconfig = stimer->config;
536 return 0;
537 }
538
539 static int stimer_get_count(struct kvm_vcpu_hv_stimer *stimer, u64 *pcount)
540 {
541 *pcount = stimer->count;
542 return 0;
543 }
544
545 static 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
586 static 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
599 static 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
614 void 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
643 void 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
652 static 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
667 static 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
676 void 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
688 int 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
699 static 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
718 static 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
730 static 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
738 static 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
761 static 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 */
808 static 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
842 void 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 gfn = hv->hv_tsc_page >> HV_X64_MSR_TSC_REFERENCE_ADDRESS_SHIFT;
856 /*
857 * Because the TSC parameters only vary when there is a
858 * change in the master clock, do not bother with caching.
859 */
860 if (unlikely(kvm_read_guest(kvm, gfn_to_gpa(gfn),
861 &tsc_seq, sizeof(tsc_seq))))
862 return;
863
864 /*
865 * While we're computing and writing the parameters, force the
866 * guest to use the time reference count MSR.
867 */
868 hv->tsc_ref.tsc_sequence = 0;
869 if (kvm_write_guest(kvm, gfn_to_gpa(gfn),
870 &hv->tsc_ref, sizeof(hv->tsc_ref.tsc_sequence)))
871 return;
872
873 if (!compute_tsc_page_parameters(hv_clock, &hv->tsc_ref))
874 return;
875
876 /* Ensure sequence is zero before writing the rest of the struct. */
877 smp_wmb();
878 if (kvm_write_guest(kvm, gfn_to_gpa(gfn), &hv->tsc_ref, sizeof(hv->tsc_ref)))
879 return;
880
881 /*
882 * Now switch to the TSC page mechanism by writing the sequence.
883 */
884 tsc_seq++;
885 if (tsc_seq == 0xFFFFFFFF || tsc_seq == 0)
886 tsc_seq = 1;
887
888 /* Write the struct entirely before the non-zero sequence. */
889 smp_wmb();
890
891 hv->tsc_ref.tsc_sequence = tsc_seq;
892 kvm_write_guest(kvm, gfn_to_gpa(gfn),
893 &hv->tsc_ref, sizeof(hv->tsc_ref.tsc_sequence));
894 }
895
896 static int kvm_hv_set_msr_pw(struct kvm_vcpu *vcpu, u32 msr, u64 data,
897 bool host)
898 {
899 struct kvm *kvm = vcpu->kvm;
900 struct kvm_hv *hv = &kvm->arch.hyperv;
901
902 switch (msr) {
903 case HV_X64_MSR_GUEST_OS_ID:
904 hv->hv_guest_os_id = data;
905 /* setting guest os id to zero disables hypercall page */
906 if (!hv->hv_guest_os_id)
907 hv->hv_hypercall &= ~HV_X64_MSR_HYPERCALL_ENABLE;
908 break;
909 case HV_X64_MSR_HYPERCALL: {
910 u64 gfn;
911 unsigned long addr;
912 u8 instructions[4];
913
914 /* if guest os id is not set hypercall should remain disabled */
915 if (!hv->hv_guest_os_id)
916 break;
917 if (!(data & HV_X64_MSR_HYPERCALL_ENABLE)) {
918 hv->hv_hypercall = data;
919 break;
920 }
921 gfn = data >> HV_X64_MSR_HYPERCALL_PAGE_ADDRESS_SHIFT;
922 addr = gfn_to_hva(kvm, gfn);
923 if (kvm_is_error_hva(addr))
924 return 1;
925 kvm_x86_ops->patch_hypercall(vcpu, instructions);
926 ((unsigned char *)instructions)[3] = 0xc3; /* ret */
927 if (__copy_to_user((void __user *)addr, instructions, 4))
928 return 1;
929 hv->hv_hypercall = data;
930 mark_page_dirty(kvm, gfn);
931 break;
932 }
933 case HV_X64_MSR_REFERENCE_TSC:
934 hv->hv_tsc_page = data;
935 if (hv->hv_tsc_page & HV_X64_MSR_TSC_REFERENCE_ENABLE)
936 kvm_make_request(KVM_REQ_MASTERCLOCK_UPDATE, vcpu);
937 break;
938 case HV_X64_MSR_CRASH_P0 ... HV_X64_MSR_CRASH_P4:
939 return kvm_hv_msr_set_crash_data(vcpu,
940 msr - HV_X64_MSR_CRASH_P0,
941 data);
942 case HV_X64_MSR_CRASH_CTL:
943 return kvm_hv_msr_set_crash_ctl(vcpu, data, host);
944 case HV_X64_MSR_RESET:
945 if (data == 1) {
946 vcpu_debug(vcpu, "hyper-v reset requested\n");
947 kvm_make_request(KVM_REQ_HV_RESET, vcpu);
948 }
949 break;
950 default:
951 vcpu_unimpl(vcpu, "Hyper-V uhandled wrmsr: 0x%x data 0x%llx\n",
952 msr, data);
953 return 1;
954 }
955 return 0;
956 }
957
958 /* Calculate cpu time spent by current task in 100ns units */
959 static u64 current_task_runtime_100ns(void)
960 {
961 cputime_t utime, stime;
962
963 task_cputime_adjusted(current, &utime, &stime);
964 return div_u64(cputime_to_nsecs(utime + stime), 100);
965 }
966
967 static int kvm_hv_set_msr(struct kvm_vcpu *vcpu, u32 msr, u64 data, bool host)
968 {
969 struct kvm_vcpu_hv *hv = &vcpu->arch.hyperv;
970
971 switch (msr) {
972 case HV_X64_MSR_APIC_ASSIST_PAGE: {
973 u64 gfn;
974 unsigned long addr;
975
976 if (!(data & HV_X64_MSR_APIC_ASSIST_PAGE_ENABLE)) {
977 hv->hv_vapic = data;
978 if (kvm_lapic_enable_pv_eoi(vcpu, 0))
979 return 1;
980 break;
981 }
982 gfn = data >> HV_X64_MSR_APIC_ASSIST_PAGE_ADDRESS_SHIFT;
983 addr = kvm_vcpu_gfn_to_hva(vcpu, gfn);
984 if (kvm_is_error_hva(addr))
985 return 1;
986 if (__clear_user((void __user *)addr, PAGE_SIZE))
987 return 1;
988 hv->hv_vapic = data;
989 kvm_vcpu_mark_page_dirty(vcpu, gfn);
990 if (kvm_lapic_enable_pv_eoi(vcpu,
991 gfn_to_gpa(gfn) | KVM_MSR_ENABLED))
992 return 1;
993 break;
994 }
995 case HV_X64_MSR_EOI:
996 return kvm_hv_vapic_msr_write(vcpu, APIC_EOI, data);
997 case HV_X64_MSR_ICR:
998 return kvm_hv_vapic_msr_write(vcpu, APIC_ICR, data);
999 case HV_X64_MSR_TPR:
1000 return kvm_hv_vapic_msr_write(vcpu, APIC_TASKPRI, data);
1001 case HV_X64_MSR_VP_RUNTIME:
1002 if (!host)
1003 return 1;
1004 hv->runtime_offset = data - current_task_runtime_100ns();
1005 break;
1006 case HV_X64_MSR_SCONTROL:
1007 case HV_X64_MSR_SVERSION:
1008 case HV_X64_MSR_SIEFP:
1009 case HV_X64_MSR_SIMP:
1010 case HV_X64_MSR_EOM:
1011 case HV_X64_MSR_SINT0 ... HV_X64_MSR_SINT15:
1012 return synic_set_msr(vcpu_to_synic(vcpu), msr, data, host);
1013 case HV_X64_MSR_STIMER0_CONFIG:
1014 case HV_X64_MSR_STIMER1_CONFIG:
1015 case HV_X64_MSR_STIMER2_CONFIG:
1016 case HV_X64_MSR_STIMER3_CONFIG: {
1017 int timer_index = (msr - HV_X64_MSR_STIMER0_CONFIG)/2;
1018
1019 return stimer_set_config(vcpu_to_stimer(vcpu, timer_index),
1020 data, host);
1021 }
1022 case HV_X64_MSR_STIMER0_COUNT:
1023 case HV_X64_MSR_STIMER1_COUNT:
1024 case HV_X64_MSR_STIMER2_COUNT:
1025 case HV_X64_MSR_STIMER3_COUNT: {
1026 int timer_index = (msr - HV_X64_MSR_STIMER0_COUNT)/2;
1027
1028 return stimer_set_count(vcpu_to_stimer(vcpu, timer_index),
1029 data, host);
1030 }
1031 default:
1032 vcpu_unimpl(vcpu, "Hyper-V uhandled wrmsr: 0x%x data 0x%llx\n",
1033 msr, data);
1034 return 1;
1035 }
1036
1037 return 0;
1038 }
1039
1040 static int kvm_hv_get_msr_pw(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1041 {
1042 u64 data = 0;
1043 struct kvm *kvm = vcpu->kvm;
1044 struct kvm_hv *hv = &kvm->arch.hyperv;
1045
1046 switch (msr) {
1047 case HV_X64_MSR_GUEST_OS_ID:
1048 data = hv->hv_guest_os_id;
1049 break;
1050 case HV_X64_MSR_HYPERCALL:
1051 data = hv->hv_hypercall;
1052 break;
1053 case HV_X64_MSR_TIME_REF_COUNT:
1054 data = get_time_ref_counter(kvm);
1055 break;
1056 case HV_X64_MSR_REFERENCE_TSC:
1057 data = hv->hv_tsc_page;
1058 break;
1059 case HV_X64_MSR_CRASH_P0 ... HV_X64_MSR_CRASH_P4:
1060 return kvm_hv_msr_get_crash_data(vcpu,
1061 msr - HV_X64_MSR_CRASH_P0,
1062 pdata);
1063 case HV_X64_MSR_CRASH_CTL:
1064 return kvm_hv_msr_get_crash_ctl(vcpu, pdata);
1065 case HV_X64_MSR_RESET:
1066 data = 0;
1067 break;
1068 default:
1069 vcpu_unimpl(vcpu, "Hyper-V unhandled rdmsr: 0x%x\n", msr);
1070 return 1;
1071 }
1072
1073 *pdata = data;
1074 return 0;
1075 }
1076
1077 static int kvm_hv_get_msr(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1078 {
1079 u64 data = 0;
1080 struct kvm_vcpu_hv *hv = &vcpu->arch.hyperv;
1081
1082 switch (msr) {
1083 case HV_X64_MSR_VP_INDEX: {
1084 int r;
1085 struct kvm_vcpu *v;
1086
1087 kvm_for_each_vcpu(r, v, vcpu->kvm) {
1088 if (v == vcpu) {
1089 data = r;
1090 break;
1091 }
1092 }
1093 break;
1094 }
1095 case HV_X64_MSR_EOI:
1096 return kvm_hv_vapic_msr_read(vcpu, APIC_EOI, pdata);
1097 case HV_X64_MSR_ICR:
1098 return kvm_hv_vapic_msr_read(vcpu, APIC_ICR, pdata);
1099 case HV_X64_MSR_TPR:
1100 return kvm_hv_vapic_msr_read(vcpu, APIC_TASKPRI, pdata);
1101 case HV_X64_MSR_APIC_ASSIST_PAGE:
1102 data = hv->hv_vapic;
1103 break;
1104 case HV_X64_MSR_VP_RUNTIME:
1105 data = current_task_runtime_100ns() + hv->runtime_offset;
1106 break;
1107 case HV_X64_MSR_SCONTROL:
1108 case HV_X64_MSR_SVERSION:
1109 case HV_X64_MSR_SIEFP:
1110 case HV_X64_MSR_SIMP:
1111 case HV_X64_MSR_EOM:
1112 case HV_X64_MSR_SINT0 ... HV_X64_MSR_SINT15:
1113 return synic_get_msr(vcpu_to_synic(vcpu), msr, pdata);
1114 case HV_X64_MSR_STIMER0_CONFIG:
1115 case HV_X64_MSR_STIMER1_CONFIG:
1116 case HV_X64_MSR_STIMER2_CONFIG:
1117 case HV_X64_MSR_STIMER3_CONFIG: {
1118 int timer_index = (msr - HV_X64_MSR_STIMER0_CONFIG)/2;
1119
1120 return stimer_get_config(vcpu_to_stimer(vcpu, timer_index),
1121 pdata);
1122 }
1123 case HV_X64_MSR_STIMER0_COUNT:
1124 case HV_X64_MSR_STIMER1_COUNT:
1125 case HV_X64_MSR_STIMER2_COUNT:
1126 case HV_X64_MSR_STIMER3_COUNT: {
1127 int timer_index = (msr - HV_X64_MSR_STIMER0_COUNT)/2;
1128
1129 return stimer_get_count(vcpu_to_stimer(vcpu, timer_index),
1130 pdata);
1131 }
1132 default:
1133 vcpu_unimpl(vcpu, "Hyper-V unhandled rdmsr: 0x%x\n", msr);
1134 return 1;
1135 }
1136 *pdata = data;
1137 return 0;
1138 }
1139
1140 int kvm_hv_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data, bool host)
1141 {
1142 if (kvm_hv_msr_partition_wide(msr)) {
1143 int r;
1144
1145 mutex_lock(&vcpu->kvm->lock);
1146 r = kvm_hv_set_msr_pw(vcpu, msr, data, host);
1147 mutex_unlock(&vcpu->kvm->lock);
1148 return r;
1149 } else
1150 return kvm_hv_set_msr(vcpu, msr, data, host);
1151 }
1152
1153 int kvm_hv_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1154 {
1155 if (kvm_hv_msr_partition_wide(msr)) {
1156 int r;
1157
1158 mutex_lock(&vcpu->kvm->lock);
1159 r = kvm_hv_get_msr_pw(vcpu, msr, pdata);
1160 mutex_unlock(&vcpu->kvm->lock);
1161 return r;
1162 } else
1163 return kvm_hv_get_msr(vcpu, msr, pdata);
1164 }
1165
1166 bool kvm_hv_hypercall_enabled(struct kvm *kvm)
1167 {
1168 return kvm->arch.hyperv.hv_hypercall & HV_X64_MSR_HYPERCALL_ENABLE;
1169 }
1170
1171 static void kvm_hv_hypercall_set_result(struct kvm_vcpu *vcpu, u64 result)
1172 {
1173 bool longmode;
1174
1175 longmode = is_64_bit_mode(vcpu);
1176 if (longmode)
1177 kvm_register_write(vcpu, VCPU_REGS_RAX, result);
1178 else {
1179 kvm_register_write(vcpu, VCPU_REGS_RDX, result >> 32);
1180 kvm_register_write(vcpu, VCPU_REGS_RAX, result & 0xffffffff);
1181 }
1182 }
1183
1184 static int kvm_hv_hypercall_complete_userspace(struct kvm_vcpu *vcpu)
1185 {
1186 struct kvm_run *run = vcpu->run;
1187
1188 kvm_hv_hypercall_set_result(vcpu, run->hyperv.u.hcall.result);
1189 return 1;
1190 }
1191
1192 int kvm_hv_hypercall(struct kvm_vcpu *vcpu)
1193 {
1194 u64 param, ingpa, outgpa, ret;
1195 uint16_t code, rep_idx, rep_cnt, res = HV_STATUS_SUCCESS, rep_done = 0;
1196 bool fast, longmode;
1197
1198 /*
1199 * hypercall generates UD from non zero cpl and real mode
1200 * per HYPER-V spec
1201 */
1202 if (kvm_x86_ops->get_cpl(vcpu) != 0 || !is_protmode(vcpu)) {
1203 kvm_queue_exception(vcpu, UD_VECTOR);
1204 return 1;
1205 }
1206
1207 longmode = is_64_bit_mode(vcpu);
1208
1209 if (!longmode) {
1210 param = ((u64)kvm_register_read(vcpu, VCPU_REGS_RDX) << 32) |
1211 (kvm_register_read(vcpu, VCPU_REGS_RAX) & 0xffffffff);
1212 ingpa = ((u64)kvm_register_read(vcpu, VCPU_REGS_RBX) << 32) |
1213 (kvm_register_read(vcpu, VCPU_REGS_RCX) & 0xffffffff);
1214 outgpa = ((u64)kvm_register_read(vcpu, VCPU_REGS_RDI) << 32) |
1215 (kvm_register_read(vcpu, VCPU_REGS_RSI) & 0xffffffff);
1216 }
1217 #ifdef CONFIG_X86_64
1218 else {
1219 param = kvm_register_read(vcpu, VCPU_REGS_RCX);
1220 ingpa = kvm_register_read(vcpu, VCPU_REGS_RDX);
1221 outgpa = kvm_register_read(vcpu, VCPU_REGS_R8);
1222 }
1223 #endif
1224
1225 code = param & 0xffff;
1226 fast = (param >> 16) & 0x1;
1227 rep_cnt = (param >> 32) & 0xfff;
1228 rep_idx = (param >> 48) & 0xfff;
1229
1230 trace_kvm_hv_hypercall(code, fast, rep_cnt, rep_idx, ingpa, outgpa);
1231
1232 /* Hypercall continuation is not supported yet */
1233 if (rep_cnt || rep_idx) {
1234 res = HV_STATUS_INVALID_HYPERCALL_CODE;
1235 goto set_result;
1236 }
1237
1238 switch (code) {
1239 case HVCALL_NOTIFY_LONG_SPIN_WAIT:
1240 kvm_vcpu_on_spin(vcpu);
1241 break;
1242 case HVCALL_POST_MESSAGE:
1243 case HVCALL_SIGNAL_EVENT:
1244 /* don't bother userspace if it has no way to handle it */
1245 if (!vcpu_to_synic(vcpu)->active) {
1246 res = HV_STATUS_INVALID_HYPERCALL_CODE;
1247 break;
1248 }
1249 vcpu->run->exit_reason = KVM_EXIT_HYPERV;
1250 vcpu->run->hyperv.type = KVM_EXIT_HYPERV_HCALL;
1251 vcpu->run->hyperv.u.hcall.input = param;
1252 vcpu->run->hyperv.u.hcall.params[0] = ingpa;
1253 vcpu->run->hyperv.u.hcall.params[1] = outgpa;
1254 vcpu->arch.complete_userspace_io =
1255 kvm_hv_hypercall_complete_userspace;
1256 return 0;
1257 default:
1258 res = HV_STATUS_INVALID_HYPERCALL_CODE;
1259 break;
1260 }
1261
1262 set_result:
1263 ret = res | (((u64)rep_done & 0xfff) << 32);
1264 kvm_hv_hypercall_set_result(vcpu, ret);
1265 return 1;
1266 }
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