Commit | Line | Data |
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e83d5887 AS |
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" | |
5c919412 | 26 | #include "ioapic.h" |
e83d5887 AS |
27 | #include "hyperv.h" |
28 | ||
29 | #include <linux/kvm_host.h> | |
765eaa0f | 30 | #include <linux/highmem.h> |
32ef5517 | 31 | #include <linux/sched/cputime.h> |
faeb7833 | 32 | #include <linux/eventfd.h> |
32ef5517 | 33 | |
5c919412 | 34 | #include <asm/apicdef.h> |
e83d5887 AS |
35 | #include <trace/events/kvm.h> |
36 | ||
37 | #include "trace.h" | |
38 | ||
f21dd494 VK |
39 | #define KVM_HV_MAX_SPARSE_VCPU_SET_BITS DIV_ROUND_UP(KVM_MAX_VCPUS, 64) |
40 | ||
8644f771 VK |
41 | static void stimer_mark_pending(struct kvm_vcpu_hv_stimer *stimer, |
42 | bool vcpu_kick); | |
43 | ||
5c919412 AS |
44 | static inline u64 synic_read_sint(struct kvm_vcpu_hv_synic *synic, int sint) |
45 | { | |
46 | return atomic64_read(&synic->sint[sint]); | |
47 | } | |
48 | ||
49 | static inline int synic_get_sint_vector(u64 sint_value) | |
50 | { | |
51 | if (sint_value & HV_SYNIC_SINT_MASKED) | |
52 | return -1; | |
53 | return sint_value & HV_SYNIC_SINT_VECTOR_MASK; | |
54 | } | |
55 | ||
56 | static bool synic_has_vector_connected(struct kvm_vcpu_hv_synic *synic, | |
57 | int vector) | |
58 | { | |
59 | int i; | |
60 | ||
61 | for (i = 0; i < ARRAY_SIZE(synic->sint); i++) { | |
62 | if (synic_get_sint_vector(synic_read_sint(synic, i)) == vector) | |
63 | return true; | |
64 | } | |
65 | return false; | |
66 | } | |
67 | ||
68 | static bool synic_has_vector_auto_eoi(struct kvm_vcpu_hv_synic *synic, | |
69 | int vector) | |
70 | { | |
71 | int i; | |
72 | u64 sint_value; | |
73 | ||
74 | for (i = 0; i < ARRAY_SIZE(synic->sint); i++) { | |
75 | sint_value = synic_read_sint(synic, i); | |
76 | if (synic_get_sint_vector(sint_value) == vector && | |
77 | sint_value & HV_SYNIC_SINT_AUTO_EOI) | |
78 | return true; | |
79 | } | |
80 | return false; | |
81 | } | |
82 | ||
98f65ad4 VK |
83 | static void synic_update_vector(struct kvm_vcpu_hv_synic *synic, |
84 | int vector) | |
85 | { | |
87a8d795 VK |
86 | if (vector < HV_SYNIC_FIRST_VALID_VECTOR) |
87 | return; | |
88 | ||
98f65ad4 VK |
89 | if (synic_has_vector_connected(synic, vector)) |
90 | __set_bit(vector, synic->vec_bitmap); | |
91 | else | |
92 | __clear_bit(vector, synic->vec_bitmap); | |
93 | ||
94 | if (synic_has_vector_auto_eoi(synic, vector)) | |
95 | __set_bit(vector, synic->auto_eoi_bitmap); | |
96 | else | |
97 | __clear_bit(vector, synic->auto_eoi_bitmap); | |
98 | } | |
99 | ||
7be58a64 AS |
100 | static int synic_set_sint(struct kvm_vcpu_hv_synic *synic, int sint, |
101 | u64 data, bool host) | |
5c919412 | 102 | { |
98f65ad4 | 103 | int vector, old_vector; |
915e6f78 | 104 | bool masked; |
5c919412 AS |
105 | |
106 | vector = data & HV_SYNIC_SINT_VECTOR_MASK; | |
915e6f78 VK |
107 | masked = data & HV_SYNIC_SINT_MASKED; |
108 | ||
109 | /* | |
110 | * Valid vectors are 16-255, however, nested Hyper-V attempts to write | |
111 | * default '0x10000' value on boot and this should not #GP. We need to | |
112 | * allow zero-initing the register from host as well. | |
113 | */ | |
114 | if (vector < HV_SYNIC_FIRST_VALID_VECTOR && !host && !masked) | |
5c919412 AS |
115 | return 1; |
116 | /* | |
117 | * Guest may configure multiple SINTs to use the same vector, so | |
118 | * we maintain a bitmap of vectors handled by synic, and a | |
119 | * bitmap of vectors with auto-eoi behavior. The bitmaps are | |
120 | * updated here, and atomically queried on fast paths. | |
121 | */ | |
98f65ad4 | 122 | old_vector = synic_read_sint(synic, sint) & HV_SYNIC_SINT_VECTOR_MASK; |
5c919412 AS |
123 | |
124 | atomic64_set(&synic->sint[sint], data); | |
125 | ||
98f65ad4 | 126 | synic_update_vector(synic, old_vector); |
5c919412 | 127 | |
98f65ad4 | 128 | synic_update_vector(synic, vector); |
5c919412 AS |
129 | |
130 | /* Load SynIC vectors into EOI exit bitmap */ | |
131 | kvm_make_request(KVM_REQ_SCAN_IOAPIC, synic_to_vcpu(synic)); | |
132 | return 0; | |
133 | } | |
134 | ||
d3457c87 RK |
135 | static struct kvm_vcpu *get_vcpu_by_vpidx(struct kvm *kvm, u32 vpidx) |
136 | { | |
137 | struct kvm_vcpu *vcpu = NULL; | |
138 | int i; | |
139 | ||
9170200e VK |
140 | if (vpidx >= KVM_MAX_VCPUS) |
141 | return NULL; | |
142 | ||
143 | vcpu = kvm_get_vcpu(kvm, vpidx); | |
d3457c87 RK |
144 | if (vcpu && vcpu_to_hv_vcpu(vcpu)->vp_index == vpidx) |
145 | return vcpu; | |
146 | kvm_for_each_vcpu(i, vcpu, kvm) | |
147 | if (vcpu_to_hv_vcpu(vcpu)->vp_index == vpidx) | |
148 | return vcpu; | |
149 | return NULL; | |
150 | } | |
151 | ||
152 | static struct kvm_vcpu_hv_synic *synic_get(struct kvm *kvm, u32 vpidx) | |
5c919412 AS |
153 | { |
154 | struct kvm_vcpu *vcpu; | |
155 | struct kvm_vcpu_hv_synic *synic; | |
156 | ||
d3457c87 | 157 | vcpu = get_vcpu_by_vpidx(kvm, vpidx); |
5c919412 AS |
158 | if (!vcpu) |
159 | return NULL; | |
160 | synic = vcpu_to_synic(vcpu); | |
161 | return (synic->active) ? synic : NULL; | |
162 | } | |
163 | ||
164 | static void kvm_hv_notify_acked_sint(struct kvm_vcpu *vcpu, u32 sint) | |
165 | { | |
166 | struct kvm *kvm = vcpu->kvm; | |
765eaa0f | 167 | struct kvm_vcpu_hv_synic *synic = vcpu_to_synic(vcpu); |
1f4b34f8 AS |
168 | struct kvm_vcpu_hv *hv_vcpu = vcpu_to_hv_vcpu(vcpu); |
169 | struct kvm_vcpu_hv_stimer *stimer; | |
08a800ac | 170 | int gsi, idx; |
5c919412 | 171 | |
18659a9c | 172 | trace_kvm_hv_notify_acked_sint(vcpu->vcpu_id, sint); |
5c919412 | 173 | |
1f4b34f8 | 174 | /* Try to deliver pending Hyper-V SynIC timers messages */ |
1f4b34f8 AS |
175 | for (idx = 0; idx < ARRAY_SIZE(hv_vcpu->stimer); idx++) { |
176 | stimer = &hv_vcpu->stimer[idx]; | |
6a058a1e | 177 | if (stimer->msg_pending && stimer->config.enable && |
8644f771 | 178 | !stimer->config.direct_mode && |
08a800ac VK |
179 | stimer->config.sintx == sint) |
180 | stimer_mark_pending(stimer, false); | |
1f4b34f8 | 181 | } |
1f4b34f8 | 182 | |
5c919412 | 183 | idx = srcu_read_lock(&kvm->irq_srcu); |
1f4b34f8 | 184 | gsi = atomic_read(&synic->sint_to_gsi[sint]); |
5c919412 AS |
185 | if (gsi != -1) |
186 | kvm_notify_acked_gsi(kvm, gsi); | |
187 | srcu_read_unlock(&kvm->irq_srcu, idx); | |
188 | } | |
189 | ||
db397571 AS |
190 | static void synic_exit(struct kvm_vcpu_hv_synic *synic, u32 msr) |
191 | { | |
192 | struct kvm_vcpu *vcpu = synic_to_vcpu(synic); | |
193 | struct kvm_vcpu_hv *hv_vcpu = &vcpu->arch.hyperv; | |
194 | ||
195 | hv_vcpu->exit.type = KVM_EXIT_HYPERV_SYNIC; | |
196 | hv_vcpu->exit.u.synic.msr = msr; | |
197 | hv_vcpu->exit.u.synic.control = synic->control; | |
198 | hv_vcpu->exit.u.synic.evt_page = synic->evt_page; | |
199 | hv_vcpu->exit.u.synic.msg_page = synic->msg_page; | |
200 | ||
201 | kvm_make_request(KVM_REQ_HV_EXIT, vcpu); | |
202 | } | |
203 | ||
5c919412 AS |
204 | static int synic_set_msr(struct kvm_vcpu_hv_synic *synic, |
205 | u32 msr, u64 data, bool host) | |
206 | { | |
207 | struct kvm_vcpu *vcpu = synic_to_vcpu(synic); | |
208 | int ret; | |
209 | ||
44883f01 | 210 | if (!synic->active && !host) |
5c919412 AS |
211 | return 1; |
212 | ||
18659a9c AS |
213 | trace_kvm_hv_synic_set_msr(vcpu->vcpu_id, msr, data, host); |
214 | ||
5c919412 AS |
215 | ret = 0; |
216 | switch (msr) { | |
217 | case HV_X64_MSR_SCONTROL: | |
218 | synic->control = data; | |
db397571 AS |
219 | if (!host) |
220 | synic_exit(synic, msr); | |
5c919412 AS |
221 | break; |
222 | case HV_X64_MSR_SVERSION: | |
223 | if (!host) { | |
224 | ret = 1; | |
225 | break; | |
226 | } | |
227 | synic->version = data; | |
228 | break; | |
229 | case HV_X64_MSR_SIEFP: | |
efc479e6 RK |
230 | if ((data & HV_SYNIC_SIEFP_ENABLE) && !host && |
231 | !synic->dont_zero_synic_pages) | |
5c919412 AS |
232 | if (kvm_clear_guest(vcpu->kvm, |
233 | data & PAGE_MASK, PAGE_SIZE)) { | |
234 | ret = 1; | |
235 | break; | |
236 | } | |
237 | synic->evt_page = data; | |
db397571 AS |
238 | if (!host) |
239 | synic_exit(synic, msr); | |
5c919412 AS |
240 | break; |
241 | case HV_X64_MSR_SIMP: | |
efc479e6 RK |
242 | if ((data & HV_SYNIC_SIMP_ENABLE) && !host && |
243 | !synic->dont_zero_synic_pages) | |
5c919412 AS |
244 | if (kvm_clear_guest(vcpu->kvm, |
245 | data & PAGE_MASK, PAGE_SIZE)) { | |
246 | ret = 1; | |
247 | break; | |
248 | } | |
249 | synic->msg_page = data; | |
db397571 AS |
250 | if (!host) |
251 | synic_exit(synic, msr); | |
5c919412 AS |
252 | break; |
253 | case HV_X64_MSR_EOM: { | |
254 | int i; | |
255 | ||
256 | for (i = 0; i < ARRAY_SIZE(synic->sint); i++) | |
257 | kvm_hv_notify_acked_sint(vcpu, i); | |
258 | break; | |
259 | } | |
260 | case HV_X64_MSR_SINT0 ... HV_X64_MSR_SINT15: | |
7be58a64 | 261 | ret = synic_set_sint(synic, msr - HV_X64_MSR_SINT0, data, host); |
5c919412 AS |
262 | break; |
263 | default: | |
264 | ret = 1; | |
265 | break; | |
266 | } | |
267 | return ret; | |
268 | } | |
269 | ||
44883f01 PB |
270 | static int synic_get_msr(struct kvm_vcpu_hv_synic *synic, u32 msr, u64 *pdata, |
271 | bool host) | |
5c919412 AS |
272 | { |
273 | int ret; | |
274 | ||
44883f01 | 275 | if (!synic->active && !host) |
5c919412 AS |
276 | return 1; |
277 | ||
278 | ret = 0; | |
279 | switch (msr) { | |
280 | case HV_X64_MSR_SCONTROL: | |
281 | *pdata = synic->control; | |
282 | break; | |
283 | case HV_X64_MSR_SVERSION: | |
284 | *pdata = synic->version; | |
285 | break; | |
286 | case HV_X64_MSR_SIEFP: | |
287 | *pdata = synic->evt_page; | |
288 | break; | |
289 | case HV_X64_MSR_SIMP: | |
290 | *pdata = synic->msg_page; | |
291 | break; | |
292 | case HV_X64_MSR_EOM: | |
293 | *pdata = 0; | |
294 | break; | |
295 | case HV_X64_MSR_SINT0 ... HV_X64_MSR_SINT15: | |
296 | *pdata = atomic64_read(&synic->sint[msr - HV_X64_MSR_SINT0]); | |
297 | break; | |
298 | default: | |
299 | ret = 1; | |
300 | break; | |
301 | } | |
302 | return ret; | |
303 | } | |
304 | ||
ecd8a8c2 | 305 | static int synic_set_irq(struct kvm_vcpu_hv_synic *synic, u32 sint) |
5c919412 AS |
306 | { |
307 | struct kvm_vcpu *vcpu = synic_to_vcpu(synic); | |
308 | struct kvm_lapic_irq irq; | |
309 | int ret, vector; | |
310 | ||
311 | if (sint >= ARRAY_SIZE(synic->sint)) | |
312 | return -EINVAL; | |
313 | ||
314 | vector = synic_get_sint_vector(synic_read_sint(synic, sint)); | |
315 | if (vector < 0) | |
316 | return -ENOENT; | |
317 | ||
318 | memset(&irq, 0, sizeof(irq)); | |
f98a3efb | 319 | irq.shorthand = APIC_DEST_SELF; |
5c919412 AS |
320 | irq.dest_mode = APIC_DEST_PHYSICAL; |
321 | irq.delivery_mode = APIC_DM_FIXED; | |
322 | irq.vector = vector; | |
323 | irq.level = 1; | |
324 | ||
f98a3efb | 325 | ret = kvm_irq_delivery_to_apic(vcpu->kvm, vcpu->arch.apic, &irq, NULL); |
18659a9c | 326 | trace_kvm_hv_synic_set_irq(vcpu->vcpu_id, sint, irq.vector, ret); |
5c919412 AS |
327 | return ret; |
328 | } | |
329 | ||
d3457c87 | 330 | int kvm_hv_synic_set_irq(struct kvm *kvm, u32 vpidx, u32 sint) |
5c919412 AS |
331 | { |
332 | struct kvm_vcpu_hv_synic *synic; | |
333 | ||
d3457c87 | 334 | synic = synic_get(kvm, vpidx); |
5c919412 AS |
335 | if (!synic) |
336 | return -EINVAL; | |
337 | ||
338 | return synic_set_irq(synic, sint); | |
339 | } | |
340 | ||
341 | void kvm_hv_synic_send_eoi(struct kvm_vcpu *vcpu, int vector) | |
342 | { | |
343 | struct kvm_vcpu_hv_synic *synic = vcpu_to_synic(vcpu); | |
344 | int i; | |
345 | ||
18659a9c | 346 | trace_kvm_hv_synic_send_eoi(vcpu->vcpu_id, vector); |
5c919412 AS |
347 | |
348 | for (i = 0; i < ARRAY_SIZE(synic->sint); i++) | |
349 | if (synic_get_sint_vector(synic_read_sint(synic, i)) == vector) | |
350 | kvm_hv_notify_acked_sint(vcpu, i); | |
351 | } | |
352 | ||
d3457c87 | 353 | static int kvm_hv_set_sint_gsi(struct kvm *kvm, u32 vpidx, u32 sint, int gsi) |
5c919412 AS |
354 | { |
355 | struct kvm_vcpu_hv_synic *synic; | |
356 | ||
d3457c87 | 357 | synic = synic_get(kvm, vpidx); |
5c919412 AS |
358 | if (!synic) |
359 | return -EINVAL; | |
360 | ||
361 | if (sint >= ARRAY_SIZE(synic->sint_to_gsi)) | |
362 | return -EINVAL; | |
363 | ||
364 | atomic_set(&synic->sint_to_gsi[sint], gsi); | |
365 | return 0; | |
366 | } | |
367 | ||
368 | void kvm_hv_irq_routing_update(struct kvm *kvm) | |
369 | { | |
370 | struct kvm_irq_routing_table *irq_rt; | |
371 | struct kvm_kernel_irq_routing_entry *e; | |
372 | u32 gsi; | |
373 | ||
374 | irq_rt = srcu_dereference_check(kvm->irq_routing, &kvm->irq_srcu, | |
375 | lockdep_is_held(&kvm->irq_lock)); | |
376 | ||
377 | for (gsi = 0; gsi < irq_rt->nr_rt_entries; gsi++) { | |
378 | hlist_for_each_entry(e, &irq_rt->map[gsi], link) { | |
379 | if (e->type == KVM_IRQ_ROUTING_HV_SINT) | |
380 | kvm_hv_set_sint_gsi(kvm, e->hv_sint.vcpu, | |
381 | e->hv_sint.sint, gsi); | |
382 | } | |
383 | } | |
384 | } | |
385 | ||
386 | static void synic_init(struct kvm_vcpu_hv_synic *synic) | |
387 | { | |
388 | int i; | |
389 | ||
390 | memset(synic, 0, sizeof(*synic)); | |
391 | synic->version = HV_SYNIC_VERSION_1; | |
392 | for (i = 0; i < ARRAY_SIZE(synic->sint); i++) { | |
393 | atomic64_set(&synic->sint[i], HV_SYNIC_SINT_MASKED); | |
394 | atomic_set(&synic->sint_to_gsi[i], -1); | |
395 | } | |
396 | } | |
397 | ||
93bf4172 AS |
398 | static u64 get_time_ref_counter(struct kvm *kvm) |
399 | { | |
095cf55d PB |
400 | struct kvm_hv *hv = &kvm->arch.hyperv; |
401 | struct kvm_vcpu *vcpu; | |
402 | u64 tsc; | |
403 | ||
404 | /* | |
405 | * The guest has not set up the TSC page or the clock isn't | |
406 | * stable, fall back to get_kvmclock_ns. | |
407 | */ | |
408 | if (!hv->tsc_ref.tsc_sequence) | |
409 | return div_u64(get_kvmclock_ns(kvm), 100); | |
410 | ||
411 | vcpu = kvm_get_vcpu(kvm, 0); | |
412 | tsc = kvm_read_l1_tsc(vcpu, rdtsc()); | |
413 | return mul_u64_u64_shr(tsc, hv->tsc_ref.tsc_scale, 64) | |
414 | + hv->tsc_ref.tsc_offset; | |
93bf4172 AS |
415 | } |
416 | ||
f3b138c5 | 417 | static void stimer_mark_pending(struct kvm_vcpu_hv_stimer *stimer, |
1f4b34f8 AS |
418 | bool vcpu_kick) |
419 | { | |
420 | struct kvm_vcpu *vcpu = stimer_to_vcpu(stimer); | |
421 | ||
422 | set_bit(stimer->index, | |
423 | vcpu_to_hv_vcpu(vcpu)->stimer_pending_bitmap); | |
424 | kvm_make_request(KVM_REQ_HV_STIMER, vcpu); | |
425 | if (vcpu_kick) | |
426 | kvm_vcpu_kick(vcpu); | |
427 | } | |
428 | ||
1f4b34f8 AS |
429 | static void stimer_cleanup(struct kvm_vcpu_hv_stimer *stimer) |
430 | { | |
431 | struct kvm_vcpu *vcpu = stimer_to_vcpu(stimer); | |
432 | ||
ac3e5fca AS |
433 | trace_kvm_hv_stimer_cleanup(stimer_to_vcpu(stimer)->vcpu_id, |
434 | stimer->index); | |
435 | ||
019b9781 | 436 | hrtimer_cancel(&stimer->timer); |
1f4b34f8 AS |
437 | clear_bit(stimer->index, |
438 | vcpu_to_hv_vcpu(vcpu)->stimer_pending_bitmap); | |
439 | stimer->msg_pending = false; | |
f808495d | 440 | stimer->exp_time = 0; |
1f4b34f8 AS |
441 | } |
442 | ||
443 | static enum hrtimer_restart stimer_timer_callback(struct hrtimer *timer) | |
444 | { | |
445 | struct kvm_vcpu_hv_stimer *stimer; | |
446 | ||
447 | stimer = container_of(timer, struct kvm_vcpu_hv_stimer, timer); | |
ac3e5fca AS |
448 | trace_kvm_hv_stimer_callback(stimer_to_vcpu(stimer)->vcpu_id, |
449 | stimer->index); | |
f3b138c5 | 450 | stimer_mark_pending(stimer, true); |
1f4b34f8 AS |
451 | |
452 | return HRTIMER_NORESTART; | |
453 | } | |
454 | ||
f808495d AS |
455 | /* |
456 | * stimer_start() assumptions: | |
457 | * a) stimer->count is not equal to 0 | |
458 | * b) stimer->config has HV_STIMER_ENABLE flag | |
459 | */ | |
1f4b34f8 AS |
460 | static int stimer_start(struct kvm_vcpu_hv_stimer *stimer) |
461 | { | |
462 | u64 time_now; | |
463 | ktime_t ktime_now; | |
464 | ||
465 | time_now = get_time_ref_counter(stimer_to_vcpu(stimer)->kvm); | |
466 | ktime_now = ktime_get(); | |
467 | ||
6a058a1e | 468 | if (stimer->config.periodic) { |
f808495d AS |
469 | if (stimer->exp_time) { |
470 | if (time_now >= stimer->exp_time) { | |
471 | u64 remainder; | |
472 | ||
473 | div64_u64_rem(time_now - stimer->exp_time, | |
474 | stimer->count, &remainder); | |
475 | stimer->exp_time = | |
476 | time_now + (stimer->count - remainder); | |
477 | } | |
478 | } else | |
479 | stimer->exp_time = time_now + stimer->count; | |
1f4b34f8 | 480 | |
ac3e5fca AS |
481 | trace_kvm_hv_stimer_start_periodic( |
482 | stimer_to_vcpu(stimer)->vcpu_id, | |
483 | stimer->index, | |
484 | time_now, stimer->exp_time); | |
485 | ||
1f4b34f8 | 486 | hrtimer_start(&stimer->timer, |
f808495d AS |
487 | ktime_add_ns(ktime_now, |
488 | 100 * (stimer->exp_time - time_now)), | |
1f4b34f8 AS |
489 | HRTIMER_MODE_ABS); |
490 | return 0; | |
491 | } | |
492 | stimer->exp_time = stimer->count; | |
493 | if (time_now >= stimer->count) { | |
494 | /* | |
495 | * Expire timer according to Hypervisor Top-Level Functional | |
496 | * specification v4(15.3.1): | |
497 | * "If a one shot is enabled and the specified count is in | |
498 | * the past, it will expire immediately." | |
499 | */ | |
f3b138c5 | 500 | stimer_mark_pending(stimer, false); |
1f4b34f8 AS |
501 | return 0; |
502 | } | |
503 | ||
ac3e5fca AS |
504 | trace_kvm_hv_stimer_start_one_shot(stimer_to_vcpu(stimer)->vcpu_id, |
505 | stimer->index, | |
506 | time_now, stimer->count); | |
507 | ||
1f4b34f8 AS |
508 | hrtimer_start(&stimer->timer, |
509 | ktime_add_ns(ktime_now, 100 * (stimer->count - time_now)), | |
510 | HRTIMER_MODE_ABS); | |
511 | return 0; | |
512 | } | |
513 | ||
514 | static int stimer_set_config(struct kvm_vcpu_hv_stimer *stimer, u64 config, | |
515 | bool host) | |
516 | { | |
8644f771 VK |
517 | union hv_stimer_config new_config = {.as_uint64 = config}, |
518 | old_config = {.as_uint64 = stimer->config.as_uint64}; | |
6a058a1e | 519 | |
ac3e5fca AS |
520 | trace_kvm_hv_stimer_set_config(stimer_to_vcpu(stimer)->vcpu_id, |
521 | stimer->index, config, host); | |
522 | ||
f3b138c5 | 523 | stimer_cleanup(stimer); |
8644f771 VK |
524 | if (old_config.enable && |
525 | !new_config.direct_mode && new_config.sintx == 0) | |
6a058a1e VK |
526 | new_config.enable = 0; |
527 | stimer->config.as_uint64 = new_config.as_uint64; | |
8644f771 | 528 | |
f3b138c5 | 529 | stimer_mark_pending(stimer, false); |
1f4b34f8 AS |
530 | return 0; |
531 | } | |
532 | ||
533 | static int stimer_set_count(struct kvm_vcpu_hv_stimer *stimer, u64 count, | |
534 | bool host) | |
535 | { | |
ac3e5fca AS |
536 | trace_kvm_hv_stimer_set_count(stimer_to_vcpu(stimer)->vcpu_id, |
537 | stimer->index, count, host); | |
538 | ||
1f4b34f8 | 539 | stimer_cleanup(stimer); |
f3b138c5 | 540 | stimer->count = count; |
1f4b34f8 | 541 | if (stimer->count == 0) |
6a058a1e VK |
542 | stimer->config.enable = 0; |
543 | else if (stimer->config.auto_enable) | |
544 | stimer->config.enable = 1; | |
f3b138c5 | 545 | stimer_mark_pending(stimer, false); |
1f4b34f8 AS |
546 | return 0; |
547 | } | |
548 | ||
549 | static int stimer_get_config(struct kvm_vcpu_hv_stimer *stimer, u64 *pconfig) | |
550 | { | |
6a058a1e | 551 | *pconfig = stimer->config.as_uint64; |
1f4b34f8 AS |
552 | return 0; |
553 | } | |
554 | ||
555 | static int stimer_get_count(struct kvm_vcpu_hv_stimer *stimer, u64 *pcount) | |
556 | { | |
557 | *pcount = stimer->count; | |
558 | return 0; | |
559 | } | |
560 | ||
561 | static int synic_deliver_msg(struct kvm_vcpu_hv_synic *synic, u32 sint, | |
7deec5e0 | 562 | struct hv_message *src_msg, bool no_retry) |
1f4b34f8 AS |
563 | { |
564 | struct kvm_vcpu *vcpu = synic_to_vcpu(synic); | |
3a0e7731 RK |
565 | int msg_off = offsetof(struct hv_message_page, sint_message[sint]); |
566 | gfn_t msg_page_gfn; | |
567 | struct hv_message_header hv_hdr; | |
1f4b34f8 | 568 | int r; |
1f4b34f8 AS |
569 | |
570 | if (!(synic->msg_page & HV_SYNIC_SIMP_ENABLE)) | |
571 | return -ENOENT; | |
572 | ||
3a0e7731 | 573 | msg_page_gfn = synic->msg_page >> PAGE_SHIFT; |
1f4b34f8 | 574 | |
3a0e7731 RK |
575 | /* |
576 | * Strictly following the spec-mandated ordering would assume setting | |
577 | * .msg_pending before checking .message_type. However, this function | |
578 | * is only called in vcpu context so the entire update is atomic from | |
579 | * guest POV and thus the exact order here doesn't matter. | |
580 | */ | |
581 | r = kvm_vcpu_read_guest_page(vcpu, msg_page_gfn, &hv_hdr.message_type, | |
582 | msg_off + offsetof(struct hv_message, | |
583 | header.message_type), | |
584 | sizeof(hv_hdr.message_type)); | |
585 | if (r < 0) | |
586 | return r; | |
587 | ||
588 | if (hv_hdr.message_type != HVMSG_NONE) { | |
7deec5e0 RK |
589 | if (no_retry) |
590 | return 0; | |
591 | ||
3a0e7731 RK |
592 | hv_hdr.message_flags.msg_pending = 1; |
593 | r = kvm_vcpu_write_guest_page(vcpu, msg_page_gfn, | |
594 | &hv_hdr.message_flags, | |
595 | msg_off + | |
596 | offsetof(struct hv_message, | |
597 | header.message_flags), | |
598 | sizeof(hv_hdr.message_flags)); | |
599 | if (r < 0) | |
600 | return r; | |
601 | return -EAGAIN; | |
1f4b34f8 | 602 | } |
3a0e7731 RK |
603 | |
604 | r = kvm_vcpu_write_guest_page(vcpu, msg_page_gfn, src_msg, msg_off, | |
605 | sizeof(src_msg->header) + | |
606 | src_msg->header.payload_size); | |
607 | if (r < 0) | |
608 | return r; | |
609 | ||
610 | r = synic_set_irq(synic, sint); | |
611 | if (r < 0) | |
612 | return r; | |
613 | if (r == 0) | |
614 | return -EFAULT; | |
615 | return 0; | |
1f4b34f8 AS |
616 | } |
617 | ||
0cdeabb1 | 618 | static int stimer_send_msg(struct kvm_vcpu_hv_stimer *stimer) |
1f4b34f8 AS |
619 | { |
620 | struct kvm_vcpu *vcpu = stimer_to_vcpu(stimer); | |
621 | struct hv_message *msg = &stimer->msg; | |
622 | struct hv_timer_message_payload *payload = | |
623 | (struct hv_timer_message_payload *)&msg->u.payload; | |
1f4b34f8 | 624 | |
7deec5e0 RK |
625 | /* |
626 | * To avoid piling up periodic ticks, don't retry message | |
627 | * delivery for them (within "lazy" lost ticks policy). | |
628 | */ | |
6a058a1e | 629 | bool no_retry = stimer->config.periodic; |
7deec5e0 | 630 | |
1f4b34f8 AS |
631 | payload->expiration_time = stimer->exp_time; |
632 | payload->delivery_time = get_time_ref_counter(vcpu->kvm); | |
0cdeabb1 | 633 | return synic_deliver_msg(vcpu_to_synic(vcpu), |
6a058a1e | 634 | stimer->config.sintx, msg, |
7deec5e0 | 635 | no_retry); |
1f4b34f8 AS |
636 | } |
637 | ||
8644f771 VK |
638 | static int stimer_notify_direct(struct kvm_vcpu_hv_stimer *stimer) |
639 | { | |
640 | struct kvm_vcpu *vcpu = stimer_to_vcpu(stimer); | |
641 | struct kvm_lapic_irq irq = { | |
642 | .delivery_mode = APIC_DM_FIXED, | |
643 | .vector = stimer->config.apic_vector | |
644 | }; | |
645 | ||
646 | return !kvm_apic_set_irq(vcpu, &irq, NULL); | |
647 | } | |
648 | ||
1f4b34f8 AS |
649 | static void stimer_expiration(struct kvm_vcpu_hv_stimer *stimer) |
650 | { | |
8644f771 | 651 | int r, direct = stimer->config.direct_mode; |
ac3e5fca | 652 | |
0cdeabb1 | 653 | stimer->msg_pending = true; |
8644f771 VK |
654 | if (!direct) |
655 | r = stimer_send_msg(stimer); | |
656 | else | |
657 | r = stimer_notify_direct(stimer); | |
ac3e5fca | 658 | trace_kvm_hv_stimer_expiration(stimer_to_vcpu(stimer)->vcpu_id, |
8644f771 | 659 | stimer->index, direct, r); |
ac3e5fca | 660 | if (!r) { |
0cdeabb1 | 661 | stimer->msg_pending = false; |
6a058a1e VK |
662 | if (!(stimer->config.periodic)) |
663 | stimer->config.enable = 0; | |
0cdeabb1 | 664 | } |
1f4b34f8 AS |
665 | } |
666 | ||
667 | void kvm_hv_process_stimers(struct kvm_vcpu *vcpu) | |
668 | { | |
669 | struct kvm_vcpu_hv *hv_vcpu = vcpu_to_hv_vcpu(vcpu); | |
670 | struct kvm_vcpu_hv_stimer *stimer; | |
f3b138c5 | 671 | u64 time_now, exp_time; |
1f4b34f8 AS |
672 | int i; |
673 | ||
674 | for (i = 0; i < ARRAY_SIZE(hv_vcpu->stimer); i++) | |
675 | if (test_and_clear_bit(i, hv_vcpu->stimer_pending_bitmap)) { | |
676 | stimer = &hv_vcpu->stimer[i]; | |
6a058a1e | 677 | if (stimer->config.enable) { |
f3b138c5 AS |
678 | exp_time = stimer->exp_time; |
679 | ||
680 | if (exp_time) { | |
681 | time_now = | |
682 | get_time_ref_counter(vcpu->kvm); | |
683 | if (time_now >= exp_time) | |
684 | stimer_expiration(stimer); | |
685 | } | |
0cdeabb1 | 686 | |
6a058a1e | 687 | if ((stimer->config.enable) && |
f1ff89ec RK |
688 | stimer->count) { |
689 | if (!stimer->msg_pending) | |
690 | stimer_start(stimer); | |
691 | } else | |
0cdeabb1 | 692 | stimer_cleanup(stimer); |
1f4b34f8 AS |
693 | } |
694 | } | |
695 | } | |
696 | ||
697 | void kvm_hv_vcpu_uninit(struct kvm_vcpu *vcpu) | |
698 | { | |
699 | struct kvm_vcpu_hv *hv_vcpu = vcpu_to_hv_vcpu(vcpu); | |
700 | int i; | |
701 | ||
702 | for (i = 0; i < ARRAY_SIZE(hv_vcpu->stimer); i++) | |
703 | stimer_cleanup(&hv_vcpu->stimer[i]); | |
704 | } | |
705 | ||
72bbf935 LP |
706 | bool kvm_hv_assist_page_enabled(struct kvm_vcpu *vcpu) |
707 | { | |
708 | if (!(vcpu->arch.hyperv.hv_vapic & HV_X64_MSR_VP_ASSIST_PAGE_ENABLE)) | |
709 | return false; | |
710 | return vcpu->arch.pv_eoi.msr_val & KVM_MSR_ENABLED; | |
711 | } | |
712 | EXPORT_SYMBOL_GPL(kvm_hv_assist_page_enabled); | |
713 | ||
714 | bool kvm_hv_get_assist_page(struct kvm_vcpu *vcpu, | |
715 | struct hv_vp_assist_page *assist_page) | |
716 | { | |
717 | if (!kvm_hv_assist_page_enabled(vcpu)) | |
718 | return false; | |
719 | return !kvm_read_guest_cached(vcpu->kvm, &vcpu->arch.pv_eoi.data, | |
720 | assist_page, sizeof(*assist_page)); | |
721 | } | |
722 | EXPORT_SYMBOL_GPL(kvm_hv_get_assist_page); | |
723 | ||
1f4b34f8 AS |
724 | static void stimer_prepare_msg(struct kvm_vcpu_hv_stimer *stimer) |
725 | { | |
726 | struct hv_message *msg = &stimer->msg; | |
727 | struct hv_timer_message_payload *payload = | |
728 | (struct hv_timer_message_payload *)&msg->u.payload; | |
729 | ||
730 | memset(&msg->header, 0, sizeof(msg->header)); | |
731 | msg->header.message_type = HVMSG_TIMER_EXPIRED; | |
732 | msg->header.payload_size = sizeof(*payload); | |
733 | ||
734 | payload->timer_index = stimer->index; | |
735 | payload->expiration_time = 0; | |
736 | payload->delivery_time = 0; | |
737 | } | |
738 | ||
739 | static void stimer_init(struct kvm_vcpu_hv_stimer *stimer, int timer_index) | |
740 | { | |
741 | memset(stimer, 0, sizeof(*stimer)); | |
742 | stimer->index = timer_index; | |
743 | hrtimer_init(&stimer->timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS); | |
744 | stimer->timer.function = stimer_timer_callback; | |
745 | stimer_prepare_msg(stimer); | |
746 | } | |
747 | ||
5c919412 AS |
748 | void kvm_hv_vcpu_init(struct kvm_vcpu *vcpu) |
749 | { | |
1f4b34f8 AS |
750 | struct kvm_vcpu_hv *hv_vcpu = vcpu_to_hv_vcpu(vcpu); |
751 | int i; | |
752 | ||
753 | synic_init(&hv_vcpu->synic); | |
754 | ||
755 | bitmap_zero(hv_vcpu->stimer_pending_bitmap, HV_SYNIC_STIMER_COUNT); | |
756 | for (i = 0; i < ARRAY_SIZE(hv_vcpu->stimer); i++) | |
757 | stimer_init(&hv_vcpu->stimer[i], i); | |
5c919412 AS |
758 | } |
759 | ||
d3457c87 RK |
760 | void kvm_hv_vcpu_postcreate(struct kvm_vcpu *vcpu) |
761 | { | |
762 | struct kvm_vcpu_hv *hv_vcpu = vcpu_to_hv_vcpu(vcpu); | |
763 | ||
764 | hv_vcpu->vp_index = kvm_vcpu_get_idx(vcpu); | |
765 | } | |
766 | ||
efc479e6 | 767 | int kvm_hv_activate_synic(struct kvm_vcpu *vcpu, bool dont_zero_synic_pages) |
5c919412 | 768 | { |
efc479e6 RK |
769 | struct kvm_vcpu_hv_synic *synic = vcpu_to_synic(vcpu); |
770 | ||
5c919412 AS |
771 | /* |
772 | * Hyper-V SynIC auto EOI SINT's are | |
773 | * not compatible with APICV, so deactivate APICV | |
774 | */ | |
775 | kvm_vcpu_deactivate_apicv(vcpu); | |
efc479e6 RK |
776 | synic->active = true; |
777 | synic->dont_zero_synic_pages = dont_zero_synic_pages; | |
5c919412 AS |
778 | return 0; |
779 | } | |
780 | ||
e83d5887 AS |
781 | static bool kvm_hv_msr_partition_wide(u32 msr) |
782 | { | |
783 | bool r = false; | |
784 | ||
785 | switch (msr) { | |
786 | case HV_X64_MSR_GUEST_OS_ID: | |
787 | case HV_X64_MSR_HYPERCALL: | |
788 | case HV_X64_MSR_REFERENCE_TSC: | |
789 | case HV_X64_MSR_TIME_REF_COUNT: | |
e7d9513b AS |
790 | case HV_X64_MSR_CRASH_CTL: |
791 | case HV_X64_MSR_CRASH_P0 ... HV_X64_MSR_CRASH_P4: | |
e516cebb | 792 | case HV_X64_MSR_RESET: |
a2e164e7 VK |
793 | case HV_X64_MSR_REENLIGHTENMENT_CONTROL: |
794 | case HV_X64_MSR_TSC_EMULATION_CONTROL: | |
795 | case HV_X64_MSR_TSC_EMULATION_STATUS: | |
e83d5887 AS |
796 | r = true; |
797 | break; | |
798 | } | |
799 | ||
800 | return r; | |
801 | } | |
802 | ||
e7d9513b AS |
803 | static int kvm_hv_msr_get_crash_data(struct kvm_vcpu *vcpu, |
804 | u32 index, u64 *pdata) | |
805 | { | |
806 | struct kvm_hv *hv = &vcpu->kvm->arch.hyperv; | |
807 | ||
808 | if (WARN_ON_ONCE(index >= ARRAY_SIZE(hv->hv_crash_param))) | |
809 | return -EINVAL; | |
810 | ||
811 | *pdata = hv->hv_crash_param[index]; | |
812 | return 0; | |
813 | } | |
814 | ||
815 | static int kvm_hv_msr_get_crash_ctl(struct kvm_vcpu *vcpu, u64 *pdata) | |
816 | { | |
817 | struct kvm_hv *hv = &vcpu->kvm->arch.hyperv; | |
818 | ||
819 | *pdata = hv->hv_crash_ctl; | |
820 | return 0; | |
821 | } | |
822 | ||
823 | static int kvm_hv_msr_set_crash_ctl(struct kvm_vcpu *vcpu, u64 data, bool host) | |
824 | { | |
825 | struct kvm_hv *hv = &vcpu->kvm->arch.hyperv; | |
826 | ||
827 | if (host) | |
a4987def | 828 | hv->hv_crash_ctl = data & HV_CRASH_CTL_CRASH_NOTIFY; |
e7d9513b | 829 | |
a4987def | 830 | if (!host && (data & HV_CRASH_CTL_CRASH_NOTIFY)) { |
e7d9513b AS |
831 | |
832 | vcpu_debug(vcpu, "hv crash (0x%llx 0x%llx 0x%llx 0x%llx 0x%llx)\n", | |
833 | hv->hv_crash_param[0], | |
834 | hv->hv_crash_param[1], | |
835 | hv->hv_crash_param[2], | |
836 | hv->hv_crash_param[3], | |
837 | hv->hv_crash_param[4]); | |
838 | ||
839 | /* Send notification about crash to user space */ | |
840 | kvm_make_request(KVM_REQ_HV_CRASH, vcpu); | |
841 | } | |
842 | ||
843 | return 0; | |
844 | } | |
845 | ||
846 | static int kvm_hv_msr_set_crash_data(struct kvm_vcpu *vcpu, | |
847 | u32 index, u64 data) | |
848 | { | |
849 | struct kvm_hv *hv = &vcpu->kvm->arch.hyperv; | |
850 | ||
851 | if (WARN_ON_ONCE(index >= ARRAY_SIZE(hv->hv_crash_param))) | |
852 | return -EINVAL; | |
853 | ||
854 | hv->hv_crash_param[index] = data; | |
855 | return 0; | |
856 | } | |
857 | ||
095cf55d PB |
858 | /* |
859 | * The kvmclock and Hyper-V TSC page use similar formulas, and converting | |
860 | * between them is possible: | |
861 | * | |
862 | * kvmclock formula: | |
863 | * nsec = (ticks - tsc_timestamp) * tsc_to_system_mul * 2^(tsc_shift-32) | |
864 | * + system_time | |
865 | * | |
866 | * Hyper-V formula: | |
867 | * nsec/100 = ticks * scale / 2^64 + offset | |
868 | * | |
869 | * When tsc_timestamp = system_time = 0, offset is zero in the Hyper-V formula. | |
870 | * By dividing the kvmclock formula by 100 and equating what's left we get: | |
871 | * ticks * scale / 2^64 = ticks * tsc_to_system_mul * 2^(tsc_shift-32) / 100 | |
872 | * scale / 2^64 = tsc_to_system_mul * 2^(tsc_shift-32) / 100 | |
873 | * scale = tsc_to_system_mul * 2^(32+tsc_shift) / 100 | |
874 | * | |
875 | * Now expand the kvmclock formula and divide by 100: | |
876 | * nsec = ticks * tsc_to_system_mul * 2^(tsc_shift-32) | |
877 | * - tsc_timestamp * tsc_to_system_mul * 2^(tsc_shift-32) | |
878 | * + system_time | |
879 | * nsec/100 = ticks * tsc_to_system_mul * 2^(tsc_shift-32) / 100 | |
880 | * - tsc_timestamp * tsc_to_system_mul * 2^(tsc_shift-32) / 100 | |
881 | * + system_time / 100 | |
882 | * | |
883 | * Replace tsc_to_system_mul * 2^(tsc_shift-32) / 100 by scale / 2^64: | |
884 | * nsec/100 = ticks * scale / 2^64 | |
885 | * - tsc_timestamp * scale / 2^64 | |
886 | * + system_time / 100 | |
887 | * | |
888 | * Equate with the Hyper-V formula so that ticks * scale / 2^64 cancels out: | |
889 | * offset = system_time / 100 - tsc_timestamp * scale / 2^64 | |
890 | * | |
891 | * These two equivalencies are implemented in this function. | |
892 | */ | |
893 | static bool compute_tsc_page_parameters(struct pvclock_vcpu_time_info *hv_clock, | |
894 | HV_REFERENCE_TSC_PAGE *tsc_ref) | |
895 | { | |
896 | u64 max_mul; | |
897 | ||
898 | if (!(hv_clock->flags & PVCLOCK_TSC_STABLE_BIT)) | |
899 | return false; | |
900 | ||
901 | /* | |
902 | * check if scale would overflow, if so we use the time ref counter | |
903 | * tsc_to_system_mul * 2^(tsc_shift+32) / 100 >= 2^64 | |
904 | * tsc_to_system_mul / 100 >= 2^(32-tsc_shift) | |
905 | * tsc_to_system_mul >= 100 * 2^(32-tsc_shift) | |
906 | */ | |
907 | max_mul = 100ull << (32 - hv_clock->tsc_shift); | |
908 | if (hv_clock->tsc_to_system_mul >= max_mul) | |
909 | return false; | |
910 | ||
911 | /* | |
912 | * Otherwise compute the scale and offset according to the formulas | |
913 | * derived above. | |
914 | */ | |
915 | tsc_ref->tsc_scale = | |
916 | mul_u64_u32_div(1ULL << (32 + hv_clock->tsc_shift), | |
917 | hv_clock->tsc_to_system_mul, | |
918 | 100); | |
919 | ||
920 | tsc_ref->tsc_offset = hv_clock->system_time; | |
921 | do_div(tsc_ref->tsc_offset, 100); | |
922 | tsc_ref->tsc_offset -= | |
923 | mul_u64_u64_shr(hv_clock->tsc_timestamp, tsc_ref->tsc_scale, 64); | |
924 | return true; | |
925 | } | |
926 | ||
927 | void kvm_hv_setup_tsc_page(struct kvm *kvm, | |
928 | struct pvclock_vcpu_time_info *hv_clock) | |
929 | { | |
930 | struct kvm_hv *hv = &kvm->arch.hyperv; | |
931 | u32 tsc_seq; | |
932 | u64 gfn; | |
933 | ||
934 | BUILD_BUG_ON(sizeof(tsc_seq) != sizeof(hv->tsc_ref.tsc_sequence)); | |
935 | BUILD_BUG_ON(offsetof(HV_REFERENCE_TSC_PAGE, tsc_sequence) != 0); | |
936 | ||
937 | if (!(hv->hv_tsc_page & HV_X64_MSR_TSC_REFERENCE_ENABLE)) | |
938 | return; | |
939 | ||
3f5ad8be PB |
940 | mutex_lock(&kvm->arch.hyperv.hv_lock); |
941 | if (!(hv->hv_tsc_page & HV_X64_MSR_TSC_REFERENCE_ENABLE)) | |
942 | goto out_unlock; | |
943 | ||
095cf55d PB |
944 | gfn = hv->hv_tsc_page >> HV_X64_MSR_TSC_REFERENCE_ADDRESS_SHIFT; |
945 | /* | |
946 | * Because the TSC parameters only vary when there is a | |
947 | * change in the master clock, do not bother with caching. | |
948 | */ | |
949 | if (unlikely(kvm_read_guest(kvm, gfn_to_gpa(gfn), | |
950 | &tsc_seq, sizeof(tsc_seq)))) | |
3f5ad8be | 951 | goto out_unlock; |
095cf55d PB |
952 | |
953 | /* | |
954 | * While we're computing and writing the parameters, force the | |
955 | * guest to use the time reference count MSR. | |
956 | */ | |
957 | hv->tsc_ref.tsc_sequence = 0; | |
958 | if (kvm_write_guest(kvm, gfn_to_gpa(gfn), | |
959 | &hv->tsc_ref, sizeof(hv->tsc_ref.tsc_sequence))) | |
3f5ad8be | 960 | goto out_unlock; |
095cf55d PB |
961 | |
962 | if (!compute_tsc_page_parameters(hv_clock, &hv->tsc_ref)) | |
3f5ad8be | 963 | goto out_unlock; |
095cf55d PB |
964 | |
965 | /* Ensure sequence is zero before writing the rest of the struct. */ | |
966 | smp_wmb(); | |
967 | if (kvm_write_guest(kvm, gfn_to_gpa(gfn), &hv->tsc_ref, sizeof(hv->tsc_ref))) | |
3f5ad8be | 968 | goto out_unlock; |
095cf55d PB |
969 | |
970 | /* | |
971 | * Now switch to the TSC page mechanism by writing the sequence. | |
972 | */ | |
973 | tsc_seq++; | |
974 | if (tsc_seq == 0xFFFFFFFF || tsc_seq == 0) | |
975 | tsc_seq = 1; | |
976 | ||
977 | /* Write the struct entirely before the non-zero sequence. */ | |
978 | smp_wmb(); | |
979 | ||
980 | hv->tsc_ref.tsc_sequence = tsc_seq; | |
981 | kvm_write_guest(kvm, gfn_to_gpa(gfn), | |
982 | &hv->tsc_ref, sizeof(hv->tsc_ref.tsc_sequence)); | |
3f5ad8be PB |
983 | out_unlock: |
984 | mutex_unlock(&kvm->arch.hyperv.hv_lock); | |
095cf55d PB |
985 | } |
986 | ||
e7d9513b AS |
987 | static int kvm_hv_set_msr_pw(struct kvm_vcpu *vcpu, u32 msr, u64 data, |
988 | bool host) | |
e83d5887 AS |
989 | { |
990 | struct kvm *kvm = vcpu->kvm; | |
991 | struct kvm_hv *hv = &kvm->arch.hyperv; | |
992 | ||
993 | switch (msr) { | |
994 | case HV_X64_MSR_GUEST_OS_ID: | |
995 | hv->hv_guest_os_id = data; | |
996 | /* setting guest os id to zero disables hypercall page */ | |
997 | if (!hv->hv_guest_os_id) | |
998 | hv->hv_hypercall &= ~HV_X64_MSR_HYPERCALL_ENABLE; | |
999 | break; | |
1000 | case HV_X64_MSR_HYPERCALL: { | |
1001 | u64 gfn; | |
1002 | unsigned long addr; | |
1003 | u8 instructions[4]; | |
1004 | ||
1005 | /* if guest os id is not set hypercall should remain disabled */ | |
1006 | if (!hv->hv_guest_os_id) | |
1007 | break; | |
1008 | if (!(data & HV_X64_MSR_HYPERCALL_ENABLE)) { | |
1009 | hv->hv_hypercall = data; | |
1010 | break; | |
1011 | } | |
1012 | gfn = data >> HV_X64_MSR_HYPERCALL_PAGE_ADDRESS_SHIFT; | |
1013 | addr = gfn_to_hva(kvm, gfn); | |
1014 | if (kvm_is_error_hva(addr)) | |
1015 | return 1; | |
1016 | kvm_x86_ops->patch_hypercall(vcpu, instructions); | |
1017 | ((unsigned char *)instructions)[3] = 0xc3; /* ret */ | |
1018 | if (__copy_to_user((void __user *)addr, instructions, 4)) | |
1019 | return 1; | |
1020 | hv->hv_hypercall = data; | |
1021 | mark_page_dirty(kvm, gfn); | |
1022 | break; | |
1023 | } | |
095cf55d | 1024 | case HV_X64_MSR_REFERENCE_TSC: |
e83d5887 | 1025 | hv->hv_tsc_page = data; |
095cf55d PB |
1026 | if (hv->hv_tsc_page & HV_X64_MSR_TSC_REFERENCE_ENABLE) |
1027 | kvm_make_request(KVM_REQ_MASTERCLOCK_UPDATE, vcpu); | |
e83d5887 | 1028 | break; |
e7d9513b AS |
1029 | case HV_X64_MSR_CRASH_P0 ... HV_X64_MSR_CRASH_P4: |
1030 | return kvm_hv_msr_set_crash_data(vcpu, | |
1031 | msr - HV_X64_MSR_CRASH_P0, | |
1032 | data); | |
1033 | case HV_X64_MSR_CRASH_CTL: | |
1034 | return kvm_hv_msr_set_crash_ctl(vcpu, data, host); | |
e516cebb AS |
1035 | case HV_X64_MSR_RESET: |
1036 | if (data == 1) { | |
1037 | vcpu_debug(vcpu, "hyper-v reset requested\n"); | |
1038 | kvm_make_request(KVM_REQ_HV_RESET, vcpu); | |
1039 | } | |
1040 | break; | |
a2e164e7 VK |
1041 | case HV_X64_MSR_REENLIGHTENMENT_CONTROL: |
1042 | hv->hv_reenlightenment_control = data; | |
1043 | break; | |
1044 | case HV_X64_MSR_TSC_EMULATION_CONTROL: | |
1045 | hv->hv_tsc_emulation_control = data; | |
1046 | break; | |
1047 | case HV_X64_MSR_TSC_EMULATION_STATUS: | |
1048 | hv->hv_tsc_emulation_status = data; | |
1049 | break; | |
44883f01 PB |
1050 | case HV_X64_MSR_TIME_REF_COUNT: |
1051 | /* read-only, but still ignore it if host-initiated */ | |
1052 | if (!host) | |
1053 | return 1; | |
1054 | break; | |
e83d5887 AS |
1055 | default: |
1056 | vcpu_unimpl(vcpu, "Hyper-V uhandled wrmsr: 0x%x data 0x%llx\n", | |
1057 | msr, data); | |
1058 | return 1; | |
1059 | } | |
1060 | return 0; | |
1061 | } | |
1062 | ||
9eec50b8 AS |
1063 | /* Calculate cpu time spent by current task in 100ns units */ |
1064 | static u64 current_task_runtime_100ns(void) | |
1065 | { | |
5613fda9 | 1066 | u64 utime, stime; |
9eec50b8 AS |
1067 | |
1068 | task_cputime_adjusted(current, &utime, &stime); | |
5613fda9 FW |
1069 | |
1070 | return div_u64(utime + stime, 100); | |
9eec50b8 AS |
1071 | } |
1072 | ||
1073 | static int kvm_hv_set_msr(struct kvm_vcpu *vcpu, u32 msr, u64 data, bool host) | |
e83d5887 | 1074 | { |
1779a39f | 1075 | struct kvm_vcpu_hv *hv_vcpu = &vcpu->arch.hyperv; |
e83d5887 AS |
1076 | |
1077 | switch (msr) { | |
87ee613d VK |
1078 | case HV_X64_MSR_VP_INDEX: { |
1079 | struct kvm_hv *hv = &vcpu->kvm->arch.hyperv; | |
1080 | int vcpu_idx = kvm_vcpu_get_idx(vcpu); | |
1081 | u32 new_vp_index = (u32)data; | |
1082 | ||
1083 | if (!host || new_vp_index >= KVM_MAX_VCPUS) | |
d3457c87 | 1084 | return 1; |
87ee613d VK |
1085 | |
1086 | if (new_vp_index == hv_vcpu->vp_index) | |
1087 | return 0; | |
1088 | ||
1089 | /* | |
1090 | * The VP index is initialized to vcpu_index by | |
1091 | * kvm_hv_vcpu_postcreate so they initially match. Now the | |
1092 | * VP index is changing, adjust num_mismatched_vp_indexes if | |
1093 | * it now matches or no longer matches vcpu_idx. | |
1094 | */ | |
1095 | if (hv_vcpu->vp_index == vcpu_idx) | |
1096 | atomic_inc(&hv->num_mismatched_vp_indexes); | |
1097 | else if (new_vp_index == vcpu_idx) | |
1098 | atomic_dec(&hv->num_mismatched_vp_indexes); | |
1099 | ||
1100 | hv_vcpu->vp_index = new_vp_index; | |
d3457c87 | 1101 | break; |
87ee613d | 1102 | } |
d4abc577 | 1103 | case HV_X64_MSR_VP_ASSIST_PAGE: { |
e83d5887 AS |
1104 | u64 gfn; |
1105 | unsigned long addr; | |
1106 | ||
d4abc577 | 1107 | if (!(data & HV_X64_MSR_VP_ASSIST_PAGE_ENABLE)) { |
1779a39f | 1108 | hv_vcpu->hv_vapic = data; |
72bbf935 | 1109 | if (kvm_lapic_enable_pv_eoi(vcpu, 0, 0)) |
e83d5887 AS |
1110 | return 1; |
1111 | break; | |
1112 | } | |
d4abc577 | 1113 | gfn = data >> HV_X64_MSR_VP_ASSIST_PAGE_ADDRESS_SHIFT; |
e83d5887 AS |
1114 | addr = kvm_vcpu_gfn_to_hva(vcpu, gfn); |
1115 | if (kvm_is_error_hva(addr)) | |
1116 | return 1; | |
12e0c618 VK |
1117 | |
1118 | /* | |
1119 | * Clear apic_assist portion of f(struct hv_vp_assist_page | |
1120 | * only, there can be valuable data in the rest which needs | |
1121 | * to be preserved e.g. on migration. | |
1122 | */ | |
1123 | if (__clear_user((void __user *)addr, sizeof(u32))) | |
e83d5887 | 1124 | return 1; |
1779a39f | 1125 | hv_vcpu->hv_vapic = data; |
e83d5887 AS |
1126 | kvm_vcpu_mark_page_dirty(vcpu, gfn); |
1127 | if (kvm_lapic_enable_pv_eoi(vcpu, | |
72bbf935 LP |
1128 | gfn_to_gpa(gfn) | KVM_MSR_ENABLED, |
1129 | sizeof(struct hv_vp_assist_page))) | |
e83d5887 AS |
1130 | return 1; |
1131 | break; | |
1132 | } | |
1133 | case HV_X64_MSR_EOI: | |
1134 | return kvm_hv_vapic_msr_write(vcpu, APIC_EOI, data); | |
1135 | case HV_X64_MSR_ICR: | |
1136 | return kvm_hv_vapic_msr_write(vcpu, APIC_ICR, data); | |
1137 | case HV_X64_MSR_TPR: | |
1138 | return kvm_hv_vapic_msr_write(vcpu, APIC_TASKPRI, data); | |
9eec50b8 AS |
1139 | case HV_X64_MSR_VP_RUNTIME: |
1140 | if (!host) | |
1141 | return 1; | |
1779a39f | 1142 | hv_vcpu->runtime_offset = data - current_task_runtime_100ns(); |
9eec50b8 | 1143 | break; |
5c919412 AS |
1144 | case HV_X64_MSR_SCONTROL: |
1145 | case HV_X64_MSR_SVERSION: | |
1146 | case HV_X64_MSR_SIEFP: | |
1147 | case HV_X64_MSR_SIMP: | |
1148 | case HV_X64_MSR_EOM: | |
1149 | case HV_X64_MSR_SINT0 ... HV_X64_MSR_SINT15: | |
1150 | return synic_set_msr(vcpu_to_synic(vcpu), msr, data, host); | |
1f4b34f8 AS |
1151 | case HV_X64_MSR_STIMER0_CONFIG: |
1152 | case HV_X64_MSR_STIMER1_CONFIG: | |
1153 | case HV_X64_MSR_STIMER2_CONFIG: | |
1154 | case HV_X64_MSR_STIMER3_CONFIG: { | |
1155 | int timer_index = (msr - HV_X64_MSR_STIMER0_CONFIG)/2; | |
1156 | ||
1157 | return stimer_set_config(vcpu_to_stimer(vcpu, timer_index), | |
1158 | data, host); | |
1159 | } | |
1160 | case HV_X64_MSR_STIMER0_COUNT: | |
1161 | case HV_X64_MSR_STIMER1_COUNT: | |
1162 | case HV_X64_MSR_STIMER2_COUNT: | |
1163 | case HV_X64_MSR_STIMER3_COUNT: { | |
1164 | int timer_index = (msr - HV_X64_MSR_STIMER0_COUNT)/2; | |
1165 | ||
1166 | return stimer_set_count(vcpu_to_stimer(vcpu, timer_index), | |
1167 | data, host); | |
1168 | } | |
44883f01 PB |
1169 | case HV_X64_MSR_TSC_FREQUENCY: |
1170 | case HV_X64_MSR_APIC_FREQUENCY: | |
1171 | /* read-only, but still ignore it if host-initiated */ | |
1172 | if (!host) | |
1173 | return 1; | |
1174 | break; | |
e83d5887 AS |
1175 | default: |
1176 | vcpu_unimpl(vcpu, "Hyper-V uhandled wrmsr: 0x%x data 0x%llx\n", | |
1177 | msr, data); | |
1178 | return 1; | |
1179 | } | |
1180 | ||
1181 | return 0; | |
1182 | } | |
1183 | ||
1184 | static int kvm_hv_get_msr_pw(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata) | |
1185 | { | |
1186 | u64 data = 0; | |
1187 | struct kvm *kvm = vcpu->kvm; | |
1188 | struct kvm_hv *hv = &kvm->arch.hyperv; | |
1189 | ||
1190 | switch (msr) { | |
1191 | case HV_X64_MSR_GUEST_OS_ID: | |
1192 | data = hv->hv_guest_os_id; | |
1193 | break; | |
1194 | case HV_X64_MSR_HYPERCALL: | |
1195 | data = hv->hv_hypercall; | |
1196 | break; | |
93bf4172 AS |
1197 | case HV_X64_MSR_TIME_REF_COUNT: |
1198 | data = get_time_ref_counter(kvm); | |
e83d5887 | 1199 | break; |
e83d5887 AS |
1200 | case HV_X64_MSR_REFERENCE_TSC: |
1201 | data = hv->hv_tsc_page; | |
1202 | break; | |
e7d9513b AS |
1203 | case HV_X64_MSR_CRASH_P0 ... HV_X64_MSR_CRASH_P4: |
1204 | return kvm_hv_msr_get_crash_data(vcpu, | |
1205 | msr - HV_X64_MSR_CRASH_P0, | |
1206 | pdata); | |
1207 | case HV_X64_MSR_CRASH_CTL: | |
1208 | return kvm_hv_msr_get_crash_ctl(vcpu, pdata); | |
e516cebb AS |
1209 | case HV_X64_MSR_RESET: |
1210 | data = 0; | |
1211 | break; | |
a2e164e7 VK |
1212 | case HV_X64_MSR_REENLIGHTENMENT_CONTROL: |
1213 | data = hv->hv_reenlightenment_control; | |
1214 | break; | |
1215 | case HV_X64_MSR_TSC_EMULATION_CONTROL: | |
1216 | data = hv->hv_tsc_emulation_control; | |
1217 | break; | |
1218 | case HV_X64_MSR_TSC_EMULATION_STATUS: | |
1219 | data = hv->hv_tsc_emulation_status; | |
1220 | break; | |
e83d5887 AS |
1221 | default: |
1222 | vcpu_unimpl(vcpu, "Hyper-V unhandled rdmsr: 0x%x\n", msr); | |
1223 | return 1; | |
1224 | } | |
1225 | ||
1226 | *pdata = data; | |
1227 | return 0; | |
1228 | } | |
1229 | ||
44883f01 PB |
1230 | static int kvm_hv_get_msr(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata, |
1231 | bool host) | |
e83d5887 AS |
1232 | { |
1233 | u64 data = 0; | |
1779a39f | 1234 | struct kvm_vcpu_hv *hv_vcpu = &vcpu->arch.hyperv; |
e83d5887 AS |
1235 | |
1236 | switch (msr) { | |
d3457c87 | 1237 | case HV_X64_MSR_VP_INDEX: |
1779a39f | 1238 | data = hv_vcpu->vp_index; |
e83d5887 | 1239 | break; |
e83d5887 AS |
1240 | case HV_X64_MSR_EOI: |
1241 | return kvm_hv_vapic_msr_read(vcpu, APIC_EOI, pdata); | |
1242 | case HV_X64_MSR_ICR: | |
1243 | return kvm_hv_vapic_msr_read(vcpu, APIC_ICR, pdata); | |
1244 | case HV_X64_MSR_TPR: | |
1245 | return kvm_hv_vapic_msr_read(vcpu, APIC_TASKPRI, pdata); | |
d4abc577 | 1246 | case HV_X64_MSR_VP_ASSIST_PAGE: |
1779a39f | 1247 | data = hv_vcpu->hv_vapic; |
e83d5887 | 1248 | break; |
9eec50b8 | 1249 | case HV_X64_MSR_VP_RUNTIME: |
1779a39f | 1250 | data = current_task_runtime_100ns() + hv_vcpu->runtime_offset; |
9eec50b8 | 1251 | break; |
5c919412 AS |
1252 | case HV_X64_MSR_SCONTROL: |
1253 | case HV_X64_MSR_SVERSION: | |
1254 | case HV_X64_MSR_SIEFP: | |
1255 | case HV_X64_MSR_SIMP: | |
1256 | case HV_X64_MSR_EOM: | |
1257 | case HV_X64_MSR_SINT0 ... HV_X64_MSR_SINT15: | |
44883f01 | 1258 | return synic_get_msr(vcpu_to_synic(vcpu), msr, pdata, host); |
1f4b34f8 AS |
1259 | case HV_X64_MSR_STIMER0_CONFIG: |
1260 | case HV_X64_MSR_STIMER1_CONFIG: | |
1261 | case HV_X64_MSR_STIMER2_CONFIG: | |
1262 | case HV_X64_MSR_STIMER3_CONFIG: { | |
1263 | int timer_index = (msr - HV_X64_MSR_STIMER0_CONFIG)/2; | |
1264 | ||
1265 | return stimer_get_config(vcpu_to_stimer(vcpu, timer_index), | |
1266 | pdata); | |
1267 | } | |
1268 | case HV_X64_MSR_STIMER0_COUNT: | |
1269 | case HV_X64_MSR_STIMER1_COUNT: | |
1270 | case HV_X64_MSR_STIMER2_COUNT: | |
1271 | case HV_X64_MSR_STIMER3_COUNT: { | |
1272 | int timer_index = (msr - HV_X64_MSR_STIMER0_COUNT)/2; | |
1273 | ||
1274 | return stimer_get_count(vcpu_to_stimer(vcpu, timer_index), | |
1275 | pdata); | |
1276 | } | |
72c139ba LP |
1277 | case HV_X64_MSR_TSC_FREQUENCY: |
1278 | data = (u64)vcpu->arch.virtual_tsc_khz * 1000; | |
1279 | break; | |
1280 | case HV_X64_MSR_APIC_FREQUENCY: | |
1281 | data = APIC_BUS_FREQUENCY; | |
1282 | break; | |
e83d5887 AS |
1283 | default: |
1284 | vcpu_unimpl(vcpu, "Hyper-V unhandled rdmsr: 0x%x\n", msr); | |
1285 | return 1; | |
1286 | } | |
1287 | *pdata = data; | |
1288 | return 0; | |
1289 | } | |
1290 | ||
e7d9513b | 1291 | int kvm_hv_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data, bool host) |
e83d5887 AS |
1292 | { |
1293 | if (kvm_hv_msr_partition_wide(msr)) { | |
1294 | int r; | |
1295 | ||
3f5ad8be | 1296 | mutex_lock(&vcpu->kvm->arch.hyperv.hv_lock); |
e7d9513b | 1297 | r = kvm_hv_set_msr_pw(vcpu, msr, data, host); |
3f5ad8be | 1298 | mutex_unlock(&vcpu->kvm->arch.hyperv.hv_lock); |
e83d5887 AS |
1299 | return r; |
1300 | } else | |
9eec50b8 | 1301 | return kvm_hv_set_msr(vcpu, msr, data, host); |
e83d5887 AS |
1302 | } |
1303 | ||
44883f01 | 1304 | int kvm_hv_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata, bool host) |
e83d5887 AS |
1305 | { |
1306 | if (kvm_hv_msr_partition_wide(msr)) { | |
1307 | int r; | |
1308 | ||
3f5ad8be | 1309 | mutex_lock(&vcpu->kvm->arch.hyperv.hv_lock); |
e83d5887 | 1310 | r = kvm_hv_get_msr_pw(vcpu, msr, pdata); |
3f5ad8be | 1311 | mutex_unlock(&vcpu->kvm->arch.hyperv.hv_lock); |
e83d5887 AS |
1312 | return r; |
1313 | } else | |
44883f01 | 1314 | return kvm_hv_get_msr(vcpu, msr, pdata, host); |
e83d5887 AS |
1315 | } |
1316 | ||
f21dd494 VK |
1317 | static __always_inline unsigned long *sparse_set_to_vcpu_mask( |
1318 | struct kvm *kvm, u64 *sparse_banks, u64 valid_bank_mask, | |
1319 | u64 *vp_bitmap, unsigned long *vcpu_bitmap) | |
c7012676 | 1320 | { |
f21dd494 VK |
1321 | struct kvm_hv *hv = &kvm->arch.hyperv; |
1322 | struct kvm_vcpu *vcpu; | |
1323 | int i, bank, sbank = 0; | |
c7012676 | 1324 | |
f21dd494 VK |
1325 | memset(vp_bitmap, 0, |
1326 | KVM_HV_MAX_SPARSE_VCPU_SET_BITS * sizeof(*vp_bitmap)); | |
1327 | for_each_set_bit(bank, (unsigned long *)&valid_bank_mask, | |
1328 | KVM_HV_MAX_SPARSE_VCPU_SET_BITS) | |
1329 | vp_bitmap[bank] = sparse_banks[sbank++]; | |
c7012676 | 1330 | |
f21dd494 VK |
1331 | if (likely(!atomic_read(&hv->num_mismatched_vp_indexes))) { |
1332 | /* for all vcpus vp_index == vcpu_idx */ | |
1333 | return (unsigned long *)vp_bitmap; | |
1334 | } | |
2cefc5fe | 1335 | |
f21dd494 VK |
1336 | bitmap_zero(vcpu_bitmap, KVM_MAX_VCPUS); |
1337 | kvm_for_each_vcpu(i, vcpu, kvm) { | |
1338 | if (test_bit(vcpu_to_hv_vcpu(vcpu)->vp_index, | |
1339 | (unsigned long *)vp_bitmap)) | |
1340 | __set_bit(i, vcpu_bitmap); | |
1341 | } | |
1342 | return vcpu_bitmap; | |
c7012676 VK |
1343 | } |
1344 | ||
e2f11f42 | 1345 | static u64 kvm_hv_flush_tlb(struct kvm_vcpu *current_vcpu, u64 ingpa, |
c7012676 | 1346 | u16 rep_cnt, bool ex) |
e2f11f42 VK |
1347 | { |
1348 | struct kvm *kvm = current_vcpu->kvm; | |
2cefc5fe | 1349 | struct kvm_vcpu_hv *hv_vcpu = ¤t_vcpu->arch.hyperv; |
c7012676 | 1350 | struct hv_tlb_flush_ex flush_ex; |
e2f11f42 | 1351 | struct hv_tlb_flush flush; |
f21dd494 VK |
1352 | u64 vp_bitmap[KVM_HV_MAX_SPARSE_VCPU_SET_BITS]; |
1353 | DECLARE_BITMAP(vcpu_bitmap, KVM_MAX_VCPUS); | |
1354 | unsigned long *vcpu_mask; | |
2cefc5fe | 1355 | u64 valid_bank_mask; |
c7012676 | 1356 | u64 sparse_banks[64]; |
f21dd494 | 1357 | int sparse_banks_len; |
c7012676 | 1358 | bool all_cpus; |
e2f11f42 | 1359 | |
c7012676 VK |
1360 | if (!ex) { |
1361 | if (unlikely(kvm_read_guest(kvm, ingpa, &flush, sizeof(flush)))) | |
1362 | return HV_STATUS_INVALID_HYPERCALL_INPUT; | |
e2f11f42 | 1363 | |
c7012676 VK |
1364 | trace_kvm_hv_flush_tlb(flush.processor_mask, |
1365 | flush.address_space, flush.flags); | |
1366 | ||
2cefc5fe | 1367 | valid_bank_mask = BIT_ULL(0); |
c7012676 VK |
1368 | sparse_banks[0] = flush.processor_mask; |
1369 | all_cpus = flush.flags & HV_FLUSH_ALL_PROCESSORS; | |
1370 | } else { | |
1371 | if (unlikely(kvm_read_guest(kvm, ingpa, &flush_ex, | |
1372 | sizeof(flush_ex)))) | |
1373 | return HV_STATUS_INVALID_HYPERCALL_INPUT; | |
1374 | ||
1375 | trace_kvm_hv_flush_tlb_ex(flush_ex.hv_vp_set.valid_bank_mask, | |
1376 | flush_ex.hv_vp_set.format, | |
1377 | flush_ex.address_space, | |
1378 | flush_ex.flags); | |
1379 | ||
1380 | valid_bank_mask = flush_ex.hv_vp_set.valid_bank_mask; | |
1381 | all_cpus = flush_ex.hv_vp_set.format != | |
1382 | HV_GENERIC_SET_SPARSE_4K; | |
1383 | ||
0b0a31ba VK |
1384 | sparse_banks_len = |
1385 | bitmap_weight((unsigned long *)&valid_bank_mask, 64) * | |
c7012676 VK |
1386 | sizeof(sparse_banks[0]); |
1387 | ||
1388 | if (!sparse_banks_len && !all_cpus) | |
1389 | goto ret_success; | |
1390 | ||
1391 | if (!all_cpus && | |
1392 | kvm_read_guest(kvm, | |
1393 | ingpa + offsetof(struct hv_tlb_flush_ex, | |
1394 | hv_vp_set.bank_contents), | |
1395 | sparse_banks, | |
1396 | sparse_banks_len)) | |
1397 | return HV_STATUS_INVALID_HYPERCALL_INPUT; | |
1398 | } | |
e2f11f42 | 1399 | |
e6b6c483 | 1400 | cpumask_clear(&hv_vcpu->tlb_flush); |
e2f11f42 | 1401 | |
f21dd494 VK |
1402 | vcpu_mask = all_cpus ? NULL : |
1403 | sparse_set_to_vcpu_mask(kvm, sparse_banks, valid_bank_mask, | |
1404 | vp_bitmap, vcpu_bitmap); | |
e2f11f42 | 1405 | |
2cefc5fe | 1406 | /* |
f21dd494 VK |
1407 | * vcpu->arch.cr3 may not be up-to-date for running vCPUs so we can't |
1408 | * analyze it here, flush TLB regardless of the specified address space. | |
2cefc5fe | 1409 | */ |
e2f11f42 VK |
1410 | kvm_make_vcpus_request_mask(kvm, |
1411 | KVM_REQ_TLB_FLUSH | KVM_REQUEST_NO_WAKEUP, | |
f21dd494 | 1412 | vcpu_mask, &hv_vcpu->tlb_flush); |
e2f11f42 | 1413 | |
c7012676 | 1414 | ret_success: |
e2f11f42 VK |
1415 | /* We always do full TLB flush, set rep_done = rep_cnt. */ |
1416 | return (u64)HV_STATUS_SUCCESS | | |
1417 | ((u64)rep_cnt << HV_HYPERCALL_REP_COMP_OFFSET); | |
1418 | } | |
1419 | ||
f21dd494 VK |
1420 | static void kvm_send_ipi_to_many(struct kvm *kvm, u32 vector, |
1421 | unsigned long *vcpu_bitmap) | |
1422 | { | |
1423 | struct kvm_lapic_irq irq = { | |
1424 | .delivery_mode = APIC_DM_FIXED, | |
1425 | .vector = vector | |
1426 | }; | |
1427 | struct kvm_vcpu *vcpu; | |
1428 | int i; | |
1429 | ||
1430 | kvm_for_each_vcpu(i, vcpu, kvm) { | |
1431 | if (vcpu_bitmap && !test_bit(i, vcpu_bitmap)) | |
1432 | continue; | |
1433 | ||
1434 | /* We fail only when APIC is disabled */ | |
1435 | kvm_apic_set_irq(vcpu, &irq, NULL); | |
1436 | } | |
1437 | } | |
1438 | ||
214ff83d VK |
1439 | static u64 kvm_hv_send_ipi(struct kvm_vcpu *current_vcpu, u64 ingpa, u64 outgpa, |
1440 | bool ex, bool fast) | |
1441 | { | |
1442 | struct kvm *kvm = current_vcpu->kvm; | |
214ff83d VK |
1443 | struct hv_send_ipi_ex send_ipi_ex; |
1444 | struct hv_send_ipi send_ipi; | |
f21dd494 VK |
1445 | u64 vp_bitmap[KVM_HV_MAX_SPARSE_VCPU_SET_BITS]; |
1446 | DECLARE_BITMAP(vcpu_bitmap, KVM_MAX_VCPUS); | |
1447 | unsigned long *vcpu_mask; | |
214ff83d VK |
1448 | unsigned long valid_bank_mask; |
1449 | u64 sparse_banks[64]; | |
f21dd494 VK |
1450 | int sparse_banks_len; |
1451 | u32 vector; | |
214ff83d VK |
1452 | bool all_cpus; |
1453 | ||
1454 | if (!ex) { | |
1455 | if (!fast) { | |
1456 | if (unlikely(kvm_read_guest(kvm, ingpa, &send_ipi, | |
1457 | sizeof(send_ipi)))) | |
1458 | return HV_STATUS_INVALID_HYPERCALL_INPUT; | |
1459 | sparse_banks[0] = send_ipi.cpu_mask; | |
f21dd494 | 1460 | vector = send_ipi.vector; |
214ff83d VK |
1461 | } else { |
1462 | /* 'reserved' part of hv_send_ipi should be 0 */ | |
1463 | if (unlikely(ingpa >> 32 != 0)) | |
1464 | return HV_STATUS_INVALID_HYPERCALL_INPUT; | |
1465 | sparse_banks[0] = outgpa; | |
f21dd494 | 1466 | vector = (u32)ingpa; |
214ff83d VK |
1467 | } |
1468 | all_cpus = false; | |
1469 | valid_bank_mask = BIT_ULL(0); | |
1470 | ||
f21dd494 | 1471 | trace_kvm_hv_send_ipi(vector, sparse_banks[0]); |
214ff83d VK |
1472 | } else { |
1473 | if (unlikely(kvm_read_guest(kvm, ingpa, &send_ipi_ex, | |
1474 | sizeof(send_ipi_ex)))) | |
1475 | return HV_STATUS_INVALID_HYPERCALL_INPUT; | |
1476 | ||
1477 | trace_kvm_hv_send_ipi_ex(send_ipi_ex.vector, | |
1478 | send_ipi_ex.vp_set.format, | |
1479 | send_ipi_ex.vp_set.valid_bank_mask); | |
1480 | ||
f21dd494 | 1481 | vector = send_ipi_ex.vector; |
214ff83d VK |
1482 | valid_bank_mask = send_ipi_ex.vp_set.valid_bank_mask; |
1483 | sparse_banks_len = bitmap_weight(&valid_bank_mask, 64) * | |
1484 | sizeof(sparse_banks[0]); | |
1485 | ||
1486 | all_cpus = send_ipi_ex.vp_set.format == HV_GENERIC_SET_ALL; | |
1487 | ||
1488 | if (!sparse_banks_len) | |
1489 | goto ret_success; | |
1490 | ||
1491 | if (!all_cpus && | |
1492 | kvm_read_guest(kvm, | |
1493 | ingpa + offsetof(struct hv_send_ipi_ex, | |
1494 | vp_set.bank_contents), | |
1495 | sparse_banks, | |
1496 | sparse_banks_len)) | |
1497 | return HV_STATUS_INVALID_HYPERCALL_INPUT; | |
1498 | } | |
1499 | ||
f21dd494 | 1500 | if ((vector < HV_IPI_LOW_VECTOR) || (vector > HV_IPI_HIGH_VECTOR)) |
214ff83d VK |
1501 | return HV_STATUS_INVALID_HYPERCALL_INPUT; |
1502 | ||
f21dd494 VK |
1503 | vcpu_mask = all_cpus ? NULL : |
1504 | sparse_set_to_vcpu_mask(kvm, sparse_banks, valid_bank_mask, | |
1505 | vp_bitmap, vcpu_bitmap); | |
214ff83d | 1506 | |
f21dd494 | 1507 | kvm_send_ipi_to_many(kvm, vector, vcpu_mask); |
214ff83d VK |
1508 | |
1509 | ret_success: | |
1510 | return HV_STATUS_SUCCESS; | |
1511 | } | |
1512 | ||
e83d5887 AS |
1513 | bool kvm_hv_hypercall_enabled(struct kvm *kvm) |
1514 | { | |
3f5ad8be | 1515 | return READ_ONCE(kvm->arch.hyperv.hv_hypercall) & HV_X64_MSR_HYPERCALL_ENABLE; |
e83d5887 AS |
1516 | } |
1517 | ||
83326e43 AS |
1518 | static void kvm_hv_hypercall_set_result(struct kvm_vcpu *vcpu, u64 result) |
1519 | { | |
1520 | bool longmode; | |
1521 | ||
1522 | longmode = is_64_bit_mode(vcpu); | |
1523 | if (longmode) | |
1524 | kvm_register_write(vcpu, VCPU_REGS_RAX, result); | |
1525 | else { | |
1526 | kvm_register_write(vcpu, VCPU_REGS_RDX, result >> 32); | |
1527 | kvm_register_write(vcpu, VCPU_REGS_RAX, result & 0xffffffff); | |
1528 | } | |
1529 | } | |
1530 | ||
696ca779 | 1531 | static int kvm_hv_hypercall_complete(struct kvm_vcpu *vcpu, u64 result) |
83326e43 | 1532 | { |
696ca779 RK |
1533 | kvm_hv_hypercall_set_result(vcpu, result); |
1534 | ++vcpu->stat.hypercalls; | |
6356ee0c | 1535 | return kvm_skip_emulated_instruction(vcpu); |
83326e43 AS |
1536 | } |
1537 | ||
696ca779 RK |
1538 | static int kvm_hv_hypercall_complete_userspace(struct kvm_vcpu *vcpu) |
1539 | { | |
1540 | return kvm_hv_hypercall_complete(vcpu, vcpu->run->hyperv.u.hcall.result); | |
1541 | } | |
1542 | ||
faeb7833 RK |
1543 | static u16 kvm_hvcall_signal_event(struct kvm_vcpu *vcpu, bool fast, u64 param) |
1544 | { | |
1545 | struct eventfd_ctx *eventfd; | |
1546 | ||
1547 | if (unlikely(!fast)) { | |
1548 | int ret; | |
1549 | gpa_t gpa = param; | |
1550 | ||
1551 | if ((gpa & (__alignof__(param) - 1)) || | |
1552 | offset_in_page(gpa) + sizeof(param) > PAGE_SIZE) | |
1553 | return HV_STATUS_INVALID_ALIGNMENT; | |
1554 | ||
1555 | ret = kvm_vcpu_read_guest(vcpu, gpa, ¶m, sizeof(param)); | |
1556 | if (ret < 0) | |
1557 | return HV_STATUS_INVALID_ALIGNMENT; | |
1558 | } | |
1559 | ||
1560 | /* | |
1561 | * Per spec, bits 32-47 contain the extra "flag number". However, we | |
1562 | * have no use for it, and in all known usecases it is zero, so just | |
1563 | * report lookup failure if it isn't. | |
1564 | */ | |
1565 | if (param & 0xffff00000000ULL) | |
1566 | return HV_STATUS_INVALID_PORT_ID; | |
1567 | /* remaining bits are reserved-zero */ | |
1568 | if (param & ~KVM_HYPERV_CONN_ID_MASK) | |
1569 | return HV_STATUS_INVALID_HYPERCALL_INPUT; | |
1570 | ||
452a68d0 PB |
1571 | /* the eventfd is protected by vcpu->kvm->srcu, but conn_to_evt isn't */ |
1572 | rcu_read_lock(); | |
faeb7833 | 1573 | eventfd = idr_find(&vcpu->kvm->arch.hyperv.conn_to_evt, param); |
452a68d0 | 1574 | rcu_read_unlock(); |
faeb7833 RK |
1575 | if (!eventfd) |
1576 | return HV_STATUS_INVALID_PORT_ID; | |
1577 | ||
1578 | eventfd_signal(eventfd, 1); | |
1579 | return HV_STATUS_SUCCESS; | |
1580 | } | |
1581 | ||
e83d5887 AS |
1582 | int kvm_hv_hypercall(struct kvm_vcpu *vcpu) |
1583 | { | |
d32ef547 DC |
1584 | u64 param, ingpa, outgpa, ret = HV_STATUS_SUCCESS; |
1585 | uint16_t code, rep_idx, rep_cnt; | |
56b9ae78 | 1586 | bool fast, longmode, rep; |
e83d5887 AS |
1587 | |
1588 | /* | |
1589 | * hypercall generates UD from non zero cpl and real mode | |
1590 | * per HYPER-V spec | |
1591 | */ | |
1592 | if (kvm_x86_ops->get_cpl(vcpu) != 0 || !is_protmode(vcpu)) { | |
1593 | kvm_queue_exception(vcpu, UD_VECTOR); | |
0d9c055e | 1594 | return 1; |
e83d5887 AS |
1595 | } |
1596 | ||
1597 | longmode = is_64_bit_mode(vcpu); | |
1598 | ||
1599 | if (!longmode) { | |
1600 | param = ((u64)kvm_register_read(vcpu, VCPU_REGS_RDX) << 32) | | |
1601 | (kvm_register_read(vcpu, VCPU_REGS_RAX) & 0xffffffff); | |
1602 | ingpa = ((u64)kvm_register_read(vcpu, VCPU_REGS_RBX) << 32) | | |
1603 | (kvm_register_read(vcpu, VCPU_REGS_RCX) & 0xffffffff); | |
1604 | outgpa = ((u64)kvm_register_read(vcpu, VCPU_REGS_RDI) << 32) | | |
1605 | (kvm_register_read(vcpu, VCPU_REGS_RSI) & 0xffffffff); | |
1606 | } | |
1607 | #ifdef CONFIG_X86_64 | |
1608 | else { | |
1609 | param = kvm_register_read(vcpu, VCPU_REGS_RCX); | |
1610 | ingpa = kvm_register_read(vcpu, VCPU_REGS_RDX); | |
1611 | outgpa = kvm_register_read(vcpu, VCPU_REGS_R8); | |
1612 | } | |
1613 | #endif | |
1614 | ||
1615 | code = param & 0xffff; | |
142c95da VK |
1616 | fast = !!(param & HV_HYPERCALL_FAST_BIT); |
1617 | rep_cnt = (param >> HV_HYPERCALL_REP_COMP_OFFSET) & 0xfff; | |
1618 | rep_idx = (param >> HV_HYPERCALL_REP_START_OFFSET) & 0xfff; | |
56b9ae78 | 1619 | rep = !!(rep_cnt || rep_idx); |
e83d5887 AS |
1620 | |
1621 | trace_kvm_hv_hypercall(code, fast, rep_cnt, rep_idx, ingpa, outgpa); | |
1622 | ||
1623 | switch (code) { | |
8ed6d767 | 1624 | case HVCALL_NOTIFY_LONG_SPIN_WAIT: |
56b9ae78 VK |
1625 | if (unlikely(rep)) { |
1626 | ret = HV_STATUS_INVALID_HYPERCALL_INPUT; | |
1627 | break; | |
1628 | } | |
de63ad4c | 1629 | kvm_vcpu_on_spin(vcpu, true); |
e83d5887 | 1630 | break; |
83326e43 | 1631 | case HVCALL_SIGNAL_EVENT: |
56b9ae78 VK |
1632 | if (unlikely(rep)) { |
1633 | ret = HV_STATUS_INVALID_HYPERCALL_INPUT; | |
1634 | break; | |
1635 | } | |
d32ef547 DC |
1636 | ret = kvm_hvcall_signal_event(vcpu, fast, ingpa); |
1637 | if (ret != HV_STATUS_INVALID_PORT_ID) | |
faeb7833 | 1638 | break; |
b2869f28 | 1639 | /* fall through - maybe userspace knows this conn_id. */ |
faeb7833 | 1640 | case HVCALL_POST_MESSAGE: |
a2b5c3c0 | 1641 | /* don't bother userspace if it has no way to handle it */ |
56b9ae78 VK |
1642 | if (unlikely(rep || !vcpu_to_synic(vcpu)->active)) { |
1643 | ret = HV_STATUS_INVALID_HYPERCALL_INPUT; | |
a2b5c3c0 PB |
1644 | break; |
1645 | } | |
83326e43 AS |
1646 | vcpu->run->exit_reason = KVM_EXIT_HYPERV; |
1647 | vcpu->run->hyperv.type = KVM_EXIT_HYPERV_HCALL; | |
1648 | vcpu->run->hyperv.u.hcall.input = param; | |
1649 | vcpu->run->hyperv.u.hcall.params[0] = ingpa; | |
1650 | vcpu->run->hyperv.u.hcall.params[1] = outgpa; | |
1651 | vcpu->arch.complete_userspace_io = | |
1652 | kvm_hv_hypercall_complete_userspace; | |
1653 | return 0; | |
e2f11f42 VK |
1654 | case HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST: |
1655 | if (unlikely(fast || !rep_cnt || rep_idx)) { | |
1656 | ret = HV_STATUS_INVALID_HYPERCALL_INPUT; | |
1657 | break; | |
1658 | } | |
c7012676 | 1659 | ret = kvm_hv_flush_tlb(vcpu, ingpa, rep_cnt, false); |
e2f11f42 VK |
1660 | break; |
1661 | case HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE: | |
1662 | if (unlikely(fast || rep)) { | |
1663 | ret = HV_STATUS_INVALID_HYPERCALL_INPUT; | |
1664 | break; | |
1665 | } | |
c7012676 VK |
1666 | ret = kvm_hv_flush_tlb(vcpu, ingpa, rep_cnt, false); |
1667 | break; | |
1668 | case HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST_EX: | |
1669 | if (unlikely(fast || !rep_cnt || rep_idx)) { | |
1670 | ret = HV_STATUS_INVALID_HYPERCALL_INPUT; | |
1671 | break; | |
1672 | } | |
1673 | ret = kvm_hv_flush_tlb(vcpu, ingpa, rep_cnt, true); | |
1674 | break; | |
1675 | case HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE_EX: | |
1676 | if (unlikely(fast || rep)) { | |
1677 | ret = HV_STATUS_INVALID_HYPERCALL_INPUT; | |
1678 | break; | |
1679 | } | |
1680 | ret = kvm_hv_flush_tlb(vcpu, ingpa, rep_cnt, true); | |
e2f11f42 | 1681 | break; |
214ff83d VK |
1682 | case HVCALL_SEND_IPI: |
1683 | if (unlikely(rep)) { | |
1684 | ret = HV_STATUS_INVALID_HYPERCALL_INPUT; | |
1685 | break; | |
1686 | } | |
1687 | ret = kvm_hv_send_ipi(vcpu, ingpa, outgpa, false, fast); | |
1688 | break; | |
1689 | case HVCALL_SEND_IPI_EX: | |
1690 | if (unlikely(fast || rep)) { | |
1691 | ret = HV_STATUS_INVALID_HYPERCALL_INPUT; | |
1692 | break; | |
1693 | } | |
1694 | ret = kvm_hv_send_ipi(vcpu, ingpa, outgpa, true, false); | |
1695 | break; | |
e83d5887 | 1696 | default: |
d32ef547 | 1697 | ret = HV_STATUS_INVALID_HYPERCALL_CODE; |
e83d5887 AS |
1698 | break; |
1699 | } | |
1700 | ||
696ca779 | 1701 | return kvm_hv_hypercall_complete(vcpu, ret); |
e83d5887 | 1702 | } |
cbc0236a RK |
1703 | |
1704 | void kvm_hv_init_vm(struct kvm *kvm) | |
1705 | { | |
1706 | mutex_init(&kvm->arch.hyperv.hv_lock); | |
faeb7833 | 1707 | idr_init(&kvm->arch.hyperv.conn_to_evt); |
cbc0236a RK |
1708 | } |
1709 | ||
1710 | void kvm_hv_destroy_vm(struct kvm *kvm) | |
1711 | { | |
faeb7833 RK |
1712 | struct eventfd_ctx *eventfd; |
1713 | int i; | |
1714 | ||
1715 | idr_for_each_entry(&kvm->arch.hyperv.conn_to_evt, eventfd, i) | |
1716 | eventfd_ctx_put(eventfd); | |
1717 | idr_destroy(&kvm->arch.hyperv.conn_to_evt); | |
1718 | } | |
1719 | ||
1720 | static int kvm_hv_eventfd_assign(struct kvm *kvm, u32 conn_id, int fd) | |
1721 | { | |
1722 | struct kvm_hv *hv = &kvm->arch.hyperv; | |
1723 | struct eventfd_ctx *eventfd; | |
1724 | int ret; | |
1725 | ||
1726 | eventfd = eventfd_ctx_fdget(fd); | |
1727 | if (IS_ERR(eventfd)) | |
1728 | return PTR_ERR(eventfd); | |
1729 | ||
1730 | mutex_lock(&hv->hv_lock); | |
1731 | ret = idr_alloc(&hv->conn_to_evt, eventfd, conn_id, conn_id + 1, | |
254272ce | 1732 | GFP_KERNEL_ACCOUNT); |
faeb7833 RK |
1733 | mutex_unlock(&hv->hv_lock); |
1734 | ||
1735 | if (ret >= 0) | |
1736 | return 0; | |
1737 | ||
1738 | if (ret == -ENOSPC) | |
1739 | ret = -EEXIST; | |
1740 | eventfd_ctx_put(eventfd); | |
1741 | return ret; | |
1742 | } | |
1743 | ||
1744 | static int kvm_hv_eventfd_deassign(struct kvm *kvm, u32 conn_id) | |
1745 | { | |
1746 | struct kvm_hv *hv = &kvm->arch.hyperv; | |
1747 | struct eventfd_ctx *eventfd; | |
1748 | ||
1749 | mutex_lock(&hv->hv_lock); | |
1750 | eventfd = idr_remove(&hv->conn_to_evt, conn_id); | |
1751 | mutex_unlock(&hv->hv_lock); | |
1752 | ||
1753 | if (!eventfd) | |
1754 | return -ENOENT; | |
1755 | ||
1756 | synchronize_srcu(&kvm->srcu); | |
1757 | eventfd_ctx_put(eventfd); | |
1758 | return 0; | |
1759 | } | |
1760 | ||
1761 | int kvm_vm_ioctl_hv_eventfd(struct kvm *kvm, struct kvm_hyperv_eventfd *args) | |
1762 | { | |
1763 | if ((args->flags & ~KVM_HYPERV_EVENTFD_DEASSIGN) || | |
1764 | (args->conn_id & ~KVM_HYPERV_CONN_ID_MASK)) | |
1765 | return -EINVAL; | |
1766 | ||
1767 | if (args->flags == KVM_HYPERV_EVENTFD_DEASSIGN) | |
1768 | return kvm_hv_eventfd_deassign(kvm, args->conn_id); | |
1769 | return kvm_hv_eventfd_assign(kvm, args->conn_id, args->fd); | |
cbc0236a | 1770 | } |
2bc39970 VK |
1771 | |
1772 | int kvm_vcpu_ioctl_get_hv_cpuid(struct kvm_vcpu *vcpu, struct kvm_cpuid2 *cpuid, | |
1773 | struct kvm_cpuid_entry2 __user *entries) | |
1774 | { | |
1775 | uint16_t evmcs_ver = kvm_x86_ops->nested_get_evmcs_version(vcpu); | |
1776 | struct kvm_cpuid_entry2 cpuid_entries[] = { | |
1777 | { .function = HYPERV_CPUID_VENDOR_AND_MAX_FUNCTIONS }, | |
1778 | { .function = HYPERV_CPUID_INTERFACE }, | |
1779 | { .function = HYPERV_CPUID_VERSION }, | |
1780 | { .function = HYPERV_CPUID_FEATURES }, | |
1781 | { .function = HYPERV_CPUID_ENLIGHTMENT_INFO }, | |
1782 | { .function = HYPERV_CPUID_IMPLEMENT_LIMITS }, | |
1783 | { .function = HYPERV_CPUID_NESTED_FEATURES }, | |
1784 | }; | |
1785 | int i, nent = ARRAY_SIZE(cpuid_entries); | |
1786 | ||
1787 | /* Skip NESTED_FEATURES if eVMCS is not supported */ | |
1788 | if (!evmcs_ver) | |
1789 | --nent; | |
1790 | ||
1791 | if (cpuid->nent < nent) | |
1792 | return -E2BIG; | |
1793 | ||
1794 | if (cpuid->nent > nent) | |
1795 | cpuid->nent = nent; | |
1796 | ||
1797 | for (i = 0; i < nent; i++) { | |
1798 | struct kvm_cpuid_entry2 *ent = &cpuid_entries[i]; | |
1799 | u32 signature[3]; | |
1800 | ||
1801 | switch (ent->function) { | |
1802 | case HYPERV_CPUID_VENDOR_AND_MAX_FUNCTIONS: | |
1803 | memcpy(signature, "Linux KVM Hv", 12); | |
1804 | ||
1805 | ent->eax = HYPERV_CPUID_NESTED_FEATURES; | |
1806 | ent->ebx = signature[0]; | |
1807 | ent->ecx = signature[1]; | |
1808 | ent->edx = signature[2]; | |
1809 | break; | |
1810 | ||
1811 | case HYPERV_CPUID_INTERFACE: | |
1812 | memcpy(signature, "Hv#1\0\0\0\0\0\0\0\0", 12); | |
1813 | ent->eax = signature[0]; | |
1814 | break; | |
1815 | ||
1816 | case HYPERV_CPUID_VERSION: | |
1817 | /* | |
1818 | * We implement some Hyper-V 2016 functions so let's use | |
1819 | * this version. | |
1820 | */ | |
1821 | ent->eax = 0x00003839; | |
1822 | ent->ebx = 0x000A0000; | |
1823 | break; | |
1824 | ||
1825 | case HYPERV_CPUID_FEATURES: | |
1826 | ent->eax |= HV_X64_MSR_VP_RUNTIME_AVAILABLE; | |
1827 | ent->eax |= HV_MSR_TIME_REF_COUNT_AVAILABLE; | |
1828 | ent->eax |= HV_X64_MSR_SYNIC_AVAILABLE; | |
1829 | ent->eax |= HV_MSR_SYNTIMER_AVAILABLE; | |
1830 | ent->eax |= HV_X64_MSR_APIC_ACCESS_AVAILABLE; | |
1831 | ent->eax |= HV_X64_MSR_HYPERCALL_AVAILABLE; | |
1832 | ent->eax |= HV_X64_MSR_VP_INDEX_AVAILABLE; | |
1833 | ent->eax |= HV_X64_MSR_RESET_AVAILABLE; | |
1834 | ent->eax |= HV_MSR_REFERENCE_TSC_AVAILABLE; | |
2bc39970 VK |
1835 | ent->eax |= HV_X64_ACCESS_FREQUENCY_MSRS; |
1836 | ent->eax |= HV_X64_ACCESS_REENLIGHTENMENT; | |
1837 | ||
1838 | ent->ebx |= HV_X64_POST_MESSAGES; | |
1839 | ent->ebx |= HV_X64_SIGNAL_EVENTS; | |
1840 | ||
1841 | ent->edx |= HV_FEATURE_FREQUENCY_MSRS_AVAILABLE; | |
1842 | ent->edx |= HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE; | |
1843 | ent->edx |= HV_STIMER_DIRECT_MODE_AVAILABLE; | |
1844 | ||
1845 | break; | |
1846 | ||
1847 | case HYPERV_CPUID_ENLIGHTMENT_INFO: | |
1848 | ent->eax |= HV_X64_REMOTE_TLB_FLUSH_RECOMMENDED; | |
1849 | ent->eax |= HV_X64_APIC_ACCESS_RECOMMENDED; | |
2bc39970 VK |
1850 | ent->eax |= HV_X64_RELAXED_TIMING_RECOMMENDED; |
1851 | ent->eax |= HV_X64_CLUSTER_IPI_RECOMMENDED; | |
1852 | ent->eax |= HV_X64_EX_PROCESSOR_MASKS_RECOMMENDED; | |
f1adceaf VK |
1853 | if (evmcs_ver) |
1854 | ent->eax |= HV_X64_ENLIGHTENED_VMCS_RECOMMENDED; | |
2bc39970 VK |
1855 | |
1856 | /* | |
1857 | * Default number of spinlock retry attempts, matches | |
1858 | * HyperV 2016. | |
1859 | */ | |
1860 | ent->ebx = 0x00000FFF; | |
1861 | ||
1862 | break; | |
1863 | ||
1864 | case HYPERV_CPUID_IMPLEMENT_LIMITS: | |
1865 | /* Maximum number of virtual processors */ | |
1866 | ent->eax = KVM_MAX_VCPUS; | |
1867 | /* | |
1868 | * Maximum number of logical processors, matches | |
1869 | * HyperV 2016. | |
1870 | */ | |
1871 | ent->ebx = 64; | |
1872 | ||
1873 | break; | |
1874 | ||
1875 | case HYPERV_CPUID_NESTED_FEATURES: | |
1876 | ent->eax = evmcs_ver; | |
1877 | ||
1878 | break; | |
1879 | ||
1880 | default: | |
1881 | break; | |
1882 | } | |
1883 | } | |
1884 | ||
1885 | if (copy_to_user(entries, cpuid_entries, | |
1886 | nent * sizeof(struct kvm_cpuid_entry2))) | |
1887 | return -EFAULT; | |
1888 | ||
1889 | return 0; | |
1890 | } |