1 // SPDX-License-Identifier: GPL-2.0-only
3 * KVM Microsoft Hyper-V emulation
5 * derived from arch/x86/kvm/x86.c
7 * Copyright (C) 2006 Qumranet, Inc.
8 * Copyright (C) 2008 Qumranet, Inc.
9 * Copyright IBM Corporation, 2008
10 * Copyright 2010 Red Hat, Inc. and/or its affiliates.
11 * Copyright (C) 2015 Andrey Smetanin <asmetanin@virtuozzo.com>
14 * Avi Kivity <avi@qumranet.com>
15 * Yaniv Kamay <yaniv@qumranet.com>
16 * Amit Shah <amit.shah@qumranet.com>
17 * Ben-Ami Yassour <benami@il.ibm.com>
18 * Andrey Smetanin <asmetanin@virtuozzo.com>
27 #include <linux/cpu.h>
28 #include <linux/kvm_host.h>
29 #include <linux/highmem.h>
30 #include <linux/sched/cputime.h>
31 #include <linux/eventfd.h>
33 #include <asm/apicdef.h>
34 #include <trace/events/kvm.h>
39 #define KVM_HV_MAX_SPARSE_VCPU_SET_BITS DIV_ROUND_UP(KVM_MAX_VCPUS, 64)
41 static void stimer_mark_pending(struct kvm_vcpu_hv_stimer *stimer,
44 static inline u64 synic_read_sint(struct kvm_vcpu_hv_synic *synic, int sint)
46 return atomic64_read(&synic->sint[sint]);
49 static inline int synic_get_sint_vector(u64 sint_value)
51 if (sint_value & HV_SYNIC_SINT_MASKED)
53 return sint_value & HV_SYNIC_SINT_VECTOR_MASK;
56 static bool synic_has_vector_connected(struct kvm_vcpu_hv_synic *synic,
61 for (i = 0; i < ARRAY_SIZE(synic->sint); i++) {
62 if (synic_get_sint_vector(synic_read_sint(synic, i)) == vector)
68 static bool synic_has_vector_auto_eoi(struct kvm_vcpu_hv_synic *synic,
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)
83 static void synic_update_vector(struct kvm_vcpu_hv_synic *synic,
86 if (vector < HV_SYNIC_FIRST_VALID_VECTOR)
89 if (synic_has_vector_connected(synic, vector))
90 __set_bit(vector, synic->vec_bitmap);
92 __clear_bit(vector, synic->vec_bitmap);
94 if (synic_has_vector_auto_eoi(synic, vector))
95 __set_bit(vector, synic->auto_eoi_bitmap);
97 __clear_bit(vector, synic->auto_eoi_bitmap);
100 static int synic_set_sint(struct kvm_vcpu_hv_synic *synic, int sint,
103 int vector, old_vector;
106 vector = data & HV_SYNIC_SINT_VECTOR_MASK;
107 masked = data & HV_SYNIC_SINT_MASKED;
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.
114 if (vector < HV_SYNIC_FIRST_VALID_VECTOR && !host && !masked)
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.
122 old_vector = synic_read_sint(synic, sint) & HV_SYNIC_SINT_VECTOR_MASK;
124 atomic64_set(&synic->sint[sint], data);
126 synic_update_vector(synic, old_vector);
128 synic_update_vector(synic, vector);
130 /* Load SynIC vectors into EOI exit bitmap */
131 kvm_make_request(KVM_REQ_SCAN_IOAPIC, synic_to_vcpu(synic));
135 static struct kvm_vcpu *get_vcpu_by_vpidx(struct kvm *kvm, u32 vpidx)
137 struct kvm_vcpu *vcpu = NULL;
140 if (vpidx >= KVM_MAX_VCPUS)
143 vcpu = kvm_get_vcpu(kvm, vpidx);
144 if (vcpu && vcpu_to_hv_vcpu(vcpu)->vp_index == vpidx)
146 kvm_for_each_vcpu(i, vcpu, kvm)
147 if (vcpu_to_hv_vcpu(vcpu)->vp_index == vpidx)
152 static struct kvm_vcpu_hv_synic *synic_get(struct kvm *kvm, u32 vpidx)
154 struct kvm_vcpu *vcpu;
155 struct kvm_vcpu_hv_synic *synic;
157 vcpu = get_vcpu_by_vpidx(kvm, vpidx);
160 synic = vcpu_to_synic(vcpu);
161 return (synic->active) ? synic : NULL;
164 static void kvm_hv_notify_acked_sint(struct kvm_vcpu *vcpu, u32 sint)
166 struct kvm *kvm = vcpu->kvm;
167 struct kvm_vcpu_hv_synic *synic = vcpu_to_synic(vcpu);
168 struct kvm_vcpu_hv *hv_vcpu = vcpu_to_hv_vcpu(vcpu);
169 struct kvm_vcpu_hv_stimer *stimer;
172 trace_kvm_hv_notify_acked_sint(vcpu->vcpu_id, sint);
174 /* Try to deliver pending Hyper-V SynIC timers messages */
175 for (idx = 0; idx < ARRAY_SIZE(hv_vcpu->stimer); idx++) {
176 stimer = &hv_vcpu->stimer[idx];
177 if (stimer->msg_pending && stimer->config.enable &&
178 !stimer->config.direct_mode &&
179 stimer->config.sintx == sint)
180 stimer_mark_pending(stimer, false);
183 idx = srcu_read_lock(&kvm->irq_srcu);
184 gsi = atomic_read(&synic->sint_to_gsi[sint]);
186 kvm_notify_acked_gsi(kvm, gsi);
187 srcu_read_unlock(&kvm->irq_srcu, idx);
190 static void synic_exit(struct kvm_vcpu_hv_synic *synic, u32 msr)
192 struct kvm_vcpu *vcpu = synic_to_vcpu(synic);
193 struct kvm_vcpu_hv *hv_vcpu = &vcpu->arch.hyperv;
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;
201 kvm_make_request(KVM_REQ_HV_EXIT, vcpu);
204 static int synic_set_msr(struct kvm_vcpu_hv_synic *synic,
205 u32 msr, u64 data, bool host)
207 struct kvm_vcpu *vcpu = synic_to_vcpu(synic);
210 if (!synic->active && !host)
213 trace_kvm_hv_synic_set_msr(vcpu->vcpu_id, msr, data, host);
217 case HV_X64_MSR_SCONTROL:
218 synic->control = data;
220 synic_exit(synic, msr);
222 case HV_X64_MSR_SVERSION:
227 synic->version = data;
229 case HV_X64_MSR_SIEFP:
230 if ((data & HV_SYNIC_SIEFP_ENABLE) && !host &&
231 !synic->dont_zero_synic_pages)
232 if (kvm_clear_guest(vcpu->kvm,
233 data & PAGE_MASK, PAGE_SIZE)) {
237 synic->evt_page = data;
239 synic_exit(synic, msr);
241 case HV_X64_MSR_SIMP:
242 if ((data & HV_SYNIC_SIMP_ENABLE) && !host &&
243 !synic->dont_zero_synic_pages)
244 if (kvm_clear_guest(vcpu->kvm,
245 data & PAGE_MASK, PAGE_SIZE)) {
249 synic->msg_page = data;
251 synic_exit(synic, msr);
253 case HV_X64_MSR_EOM: {
256 for (i = 0; i < ARRAY_SIZE(synic->sint); i++)
257 kvm_hv_notify_acked_sint(vcpu, i);
260 case HV_X64_MSR_SINT0 ... HV_X64_MSR_SINT15:
261 ret = synic_set_sint(synic, msr - HV_X64_MSR_SINT0, data, host);
270 static bool kvm_hv_is_syndbg_enabled(struct kvm_vcpu *vcpu)
272 struct kvm_cpuid_entry2 *entry;
274 entry = kvm_find_cpuid_entry(vcpu,
275 HYPERV_CPUID_SYNDBG_PLATFORM_CAPABILITIES,
280 return entry->eax & HV_X64_SYNDBG_CAP_ALLOW_KERNEL_DEBUGGING;
283 static int kvm_hv_syndbg_complete_userspace(struct kvm_vcpu *vcpu)
285 struct kvm *kvm = vcpu->kvm;
286 struct kvm_hv *hv = &kvm->arch.hyperv;
288 if (vcpu->run->hyperv.u.syndbg.msr == HV_X64_MSR_SYNDBG_CONTROL)
289 hv->hv_syndbg.control.status =
290 vcpu->run->hyperv.u.syndbg.status;
294 static void syndbg_exit(struct kvm_vcpu *vcpu, u32 msr)
296 struct kvm_hv_syndbg *syndbg = vcpu_to_hv_syndbg(vcpu);
297 struct kvm_vcpu_hv *hv_vcpu = &vcpu->arch.hyperv;
299 hv_vcpu->exit.type = KVM_EXIT_HYPERV_SYNDBG;
300 hv_vcpu->exit.u.syndbg.msr = msr;
301 hv_vcpu->exit.u.syndbg.control = syndbg->control.control;
302 hv_vcpu->exit.u.syndbg.send_page = syndbg->control.send_page;
303 hv_vcpu->exit.u.syndbg.recv_page = syndbg->control.recv_page;
304 hv_vcpu->exit.u.syndbg.pending_page = syndbg->control.pending_page;
305 vcpu->arch.complete_userspace_io =
306 kvm_hv_syndbg_complete_userspace;
308 kvm_make_request(KVM_REQ_HV_EXIT, vcpu);
311 static int syndbg_set_msr(struct kvm_vcpu *vcpu, u32 msr, u64 data, bool host)
313 struct kvm_hv_syndbg *syndbg = vcpu_to_hv_syndbg(vcpu);
315 if (!kvm_hv_is_syndbg_enabled(vcpu) && !host)
318 trace_kvm_hv_syndbg_set_msr(vcpu->vcpu_id,
319 vcpu_to_hv_vcpu(vcpu)->vp_index, msr, data);
321 case HV_X64_MSR_SYNDBG_CONTROL:
322 syndbg->control.control = data;
324 syndbg_exit(vcpu, msr);
326 case HV_X64_MSR_SYNDBG_STATUS:
327 syndbg->control.status = data;
329 case HV_X64_MSR_SYNDBG_SEND_BUFFER:
330 syndbg->control.send_page = data;
332 case HV_X64_MSR_SYNDBG_RECV_BUFFER:
333 syndbg->control.recv_page = data;
335 case HV_X64_MSR_SYNDBG_PENDING_BUFFER:
336 syndbg->control.pending_page = data;
338 syndbg_exit(vcpu, msr);
340 case HV_X64_MSR_SYNDBG_OPTIONS:
341 syndbg->options = data;
350 static int syndbg_get_msr(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata, bool host)
352 struct kvm_hv_syndbg *syndbg = vcpu_to_hv_syndbg(vcpu);
354 if (!kvm_hv_is_syndbg_enabled(vcpu) && !host)
358 case HV_X64_MSR_SYNDBG_CONTROL:
359 *pdata = syndbg->control.control;
361 case HV_X64_MSR_SYNDBG_STATUS:
362 *pdata = syndbg->control.status;
364 case HV_X64_MSR_SYNDBG_SEND_BUFFER:
365 *pdata = syndbg->control.send_page;
367 case HV_X64_MSR_SYNDBG_RECV_BUFFER:
368 *pdata = syndbg->control.recv_page;
370 case HV_X64_MSR_SYNDBG_PENDING_BUFFER:
371 *pdata = syndbg->control.pending_page;
373 case HV_X64_MSR_SYNDBG_OPTIONS:
374 *pdata = syndbg->options;
380 trace_kvm_hv_syndbg_get_msr(vcpu->vcpu_id,
381 vcpu_to_hv_vcpu(vcpu)->vp_index, msr,
387 static int synic_get_msr(struct kvm_vcpu_hv_synic *synic, u32 msr, u64 *pdata,
392 if (!synic->active && !host)
397 case HV_X64_MSR_SCONTROL:
398 *pdata = synic->control;
400 case HV_X64_MSR_SVERSION:
401 *pdata = synic->version;
403 case HV_X64_MSR_SIEFP:
404 *pdata = synic->evt_page;
406 case HV_X64_MSR_SIMP:
407 *pdata = synic->msg_page;
412 case HV_X64_MSR_SINT0 ... HV_X64_MSR_SINT15:
413 *pdata = atomic64_read(&synic->sint[msr - HV_X64_MSR_SINT0]);
422 static int synic_set_irq(struct kvm_vcpu_hv_synic *synic, u32 sint)
424 struct kvm_vcpu *vcpu = synic_to_vcpu(synic);
425 struct kvm_lapic_irq irq;
428 if (sint >= ARRAY_SIZE(synic->sint))
431 vector = synic_get_sint_vector(synic_read_sint(synic, sint));
435 memset(&irq, 0, sizeof(irq));
436 irq.shorthand = APIC_DEST_SELF;
437 irq.dest_mode = APIC_DEST_PHYSICAL;
438 irq.delivery_mode = APIC_DM_FIXED;
442 ret = kvm_irq_delivery_to_apic(vcpu->kvm, vcpu->arch.apic, &irq, NULL);
443 trace_kvm_hv_synic_set_irq(vcpu->vcpu_id, sint, irq.vector, ret);
447 int kvm_hv_synic_set_irq(struct kvm *kvm, u32 vpidx, u32 sint)
449 struct kvm_vcpu_hv_synic *synic;
451 synic = synic_get(kvm, vpidx);
455 return synic_set_irq(synic, sint);
458 void kvm_hv_synic_send_eoi(struct kvm_vcpu *vcpu, int vector)
460 struct kvm_vcpu_hv_synic *synic = vcpu_to_synic(vcpu);
463 trace_kvm_hv_synic_send_eoi(vcpu->vcpu_id, vector);
465 for (i = 0; i < ARRAY_SIZE(synic->sint); i++)
466 if (synic_get_sint_vector(synic_read_sint(synic, i)) == vector)
467 kvm_hv_notify_acked_sint(vcpu, i);
470 static int kvm_hv_set_sint_gsi(struct kvm *kvm, u32 vpidx, u32 sint, int gsi)
472 struct kvm_vcpu_hv_synic *synic;
474 synic = synic_get(kvm, vpidx);
478 if (sint >= ARRAY_SIZE(synic->sint_to_gsi))
481 atomic_set(&synic->sint_to_gsi[sint], gsi);
485 void kvm_hv_irq_routing_update(struct kvm *kvm)
487 struct kvm_irq_routing_table *irq_rt;
488 struct kvm_kernel_irq_routing_entry *e;
491 irq_rt = srcu_dereference_check(kvm->irq_routing, &kvm->irq_srcu,
492 lockdep_is_held(&kvm->irq_lock));
494 for (gsi = 0; gsi < irq_rt->nr_rt_entries; gsi++) {
495 hlist_for_each_entry(e, &irq_rt->map[gsi], link) {
496 if (e->type == KVM_IRQ_ROUTING_HV_SINT)
497 kvm_hv_set_sint_gsi(kvm, e->hv_sint.vcpu,
498 e->hv_sint.sint, gsi);
503 static void synic_init(struct kvm_vcpu_hv_synic *synic)
507 memset(synic, 0, sizeof(*synic));
508 synic->version = HV_SYNIC_VERSION_1;
509 for (i = 0; i < ARRAY_SIZE(synic->sint); i++) {
510 atomic64_set(&synic->sint[i], HV_SYNIC_SINT_MASKED);
511 atomic_set(&synic->sint_to_gsi[i], -1);
515 static u64 get_time_ref_counter(struct kvm *kvm)
517 struct kvm_hv *hv = &kvm->arch.hyperv;
518 struct kvm_vcpu *vcpu;
522 * The guest has not set up the TSC page or the clock isn't
523 * stable, fall back to get_kvmclock_ns.
525 if (!hv->tsc_ref.tsc_sequence)
526 return div_u64(get_kvmclock_ns(kvm), 100);
528 vcpu = kvm_get_vcpu(kvm, 0);
529 tsc = kvm_read_l1_tsc(vcpu, rdtsc());
530 return mul_u64_u64_shr(tsc, hv->tsc_ref.tsc_scale, 64)
531 + hv->tsc_ref.tsc_offset;
534 static void stimer_mark_pending(struct kvm_vcpu_hv_stimer *stimer,
537 struct kvm_vcpu *vcpu = stimer_to_vcpu(stimer);
539 set_bit(stimer->index,
540 vcpu_to_hv_vcpu(vcpu)->stimer_pending_bitmap);
541 kvm_make_request(KVM_REQ_HV_STIMER, vcpu);
546 static void stimer_cleanup(struct kvm_vcpu_hv_stimer *stimer)
548 struct kvm_vcpu *vcpu = stimer_to_vcpu(stimer);
550 trace_kvm_hv_stimer_cleanup(stimer_to_vcpu(stimer)->vcpu_id,
553 hrtimer_cancel(&stimer->timer);
554 clear_bit(stimer->index,
555 vcpu_to_hv_vcpu(vcpu)->stimer_pending_bitmap);
556 stimer->msg_pending = false;
557 stimer->exp_time = 0;
560 static enum hrtimer_restart stimer_timer_callback(struct hrtimer *timer)
562 struct kvm_vcpu_hv_stimer *stimer;
564 stimer = container_of(timer, struct kvm_vcpu_hv_stimer, timer);
565 trace_kvm_hv_stimer_callback(stimer_to_vcpu(stimer)->vcpu_id,
567 stimer_mark_pending(stimer, true);
569 return HRTIMER_NORESTART;
573 * stimer_start() assumptions:
574 * a) stimer->count is not equal to 0
575 * b) stimer->config has HV_STIMER_ENABLE flag
577 static int stimer_start(struct kvm_vcpu_hv_stimer *stimer)
582 time_now = get_time_ref_counter(stimer_to_vcpu(stimer)->kvm);
583 ktime_now = ktime_get();
585 if (stimer->config.periodic) {
586 if (stimer->exp_time) {
587 if (time_now >= stimer->exp_time) {
590 div64_u64_rem(time_now - stimer->exp_time,
591 stimer->count, &remainder);
593 time_now + (stimer->count - remainder);
596 stimer->exp_time = time_now + stimer->count;
598 trace_kvm_hv_stimer_start_periodic(
599 stimer_to_vcpu(stimer)->vcpu_id,
601 time_now, stimer->exp_time);
603 hrtimer_start(&stimer->timer,
604 ktime_add_ns(ktime_now,
605 100 * (stimer->exp_time - time_now)),
609 stimer->exp_time = stimer->count;
610 if (time_now >= stimer->count) {
612 * Expire timer according to Hypervisor Top-Level Functional
613 * specification v4(15.3.1):
614 * "If a one shot is enabled and the specified count is in
615 * the past, it will expire immediately."
617 stimer_mark_pending(stimer, false);
621 trace_kvm_hv_stimer_start_one_shot(stimer_to_vcpu(stimer)->vcpu_id,
623 time_now, stimer->count);
625 hrtimer_start(&stimer->timer,
626 ktime_add_ns(ktime_now, 100 * (stimer->count - time_now)),
631 static int stimer_set_config(struct kvm_vcpu_hv_stimer *stimer, u64 config,
634 union hv_stimer_config new_config = {.as_uint64 = config},
635 old_config = {.as_uint64 = stimer->config.as_uint64};
637 trace_kvm_hv_stimer_set_config(stimer_to_vcpu(stimer)->vcpu_id,
638 stimer->index, config, host);
640 stimer_cleanup(stimer);
641 if (old_config.enable &&
642 !new_config.direct_mode && new_config.sintx == 0)
643 new_config.enable = 0;
644 stimer->config.as_uint64 = new_config.as_uint64;
646 if (stimer->config.enable)
647 stimer_mark_pending(stimer, false);
652 static int stimer_set_count(struct kvm_vcpu_hv_stimer *stimer, u64 count,
655 trace_kvm_hv_stimer_set_count(stimer_to_vcpu(stimer)->vcpu_id,
656 stimer->index, count, host);
658 stimer_cleanup(stimer);
659 stimer->count = count;
660 if (stimer->count == 0)
661 stimer->config.enable = 0;
662 else if (stimer->config.auto_enable)
663 stimer->config.enable = 1;
665 if (stimer->config.enable)
666 stimer_mark_pending(stimer, false);
671 static int stimer_get_config(struct kvm_vcpu_hv_stimer *stimer, u64 *pconfig)
673 *pconfig = stimer->config.as_uint64;
677 static int stimer_get_count(struct kvm_vcpu_hv_stimer *stimer, u64 *pcount)
679 *pcount = stimer->count;
683 static int synic_deliver_msg(struct kvm_vcpu_hv_synic *synic, u32 sint,
684 struct hv_message *src_msg, bool no_retry)
686 struct kvm_vcpu *vcpu = synic_to_vcpu(synic);
687 int msg_off = offsetof(struct hv_message_page, sint_message[sint]);
689 struct hv_message_header hv_hdr;
692 if (!(synic->msg_page & HV_SYNIC_SIMP_ENABLE))
695 msg_page_gfn = synic->msg_page >> PAGE_SHIFT;
698 * Strictly following the spec-mandated ordering would assume setting
699 * .msg_pending before checking .message_type. However, this function
700 * is only called in vcpu context so the entire update is atomic from
701 * guest POV and thus the exact order here doesn't matter.
703 r = kvm_vcpu_read_guest_page(vcpu, msg_page_gfn, &hv_hdr.message_type,
704 msg_off + offsetof(struct hv_message,
705 header.message_type),
706 sizeof(hv_hdr.message_type));
710 if (hv_hdr.message_type != HVMSG_NONE) {
714 hv_hdr.message_flags.msg_pending = 1;
715 r = kvm_vcpu_write_guest_page(vcpu, msg_page_gfn,
716 &hv_hdr.message_flags,
718 offsetof(struct hv_message,
719 header.message_flags),
720 sizeof(hv_hdr.message_flags));
726 r = kvm_vcpu_write_guest_page(vcpu, msg_page_gfn, src_msg, msg_off,
727 sizeof(src_msg->header) +
728 src_msg->header.payload_size);
732 r = synic_set_irq(synic, sint);
740 static int stimer_send_msg(struct kvm_vcpu_hv_stimer *stimer)
742 struct kvm_vcpu *vcpu = stimer_to_vcpu(stimer);
743 struct hv_message *msg = &stimer->msg;
744 struct hv_timer_message_payload *payload =
745 (struct hv_timer_message_payload *)&msg->u.payload;
748 * To avoid piling up periodic ticks, don't retry message
749 * delivery for them (within "lazy" lost ticks policy).
751 bool no_retry = stimer->config.periodic;
753 payload->expiration_time = stimer->exp_time;
754 payload->delivery_time = get_time_ref_counter(vcpu->kvm);
755 return synic_deliver_msg(vcpu_to_synic(vcpu),
756 stimer->config.sintx, msg,
760 static int stimer_notify_direct(struct kvm_vcpu_hv_stimer *stimer)
762 struct kvm_vcpu *vcpu = stimer_to_vcpu(stimer);
763 struct kvm_lapic_irq irq = {
764 .delivery_mode = APIC_DM_FIXED,
765 .vector = stimer->config.apic_vector
768 if (lapic_in_kernel(vcpu))
769 return !kvm_apic_set_irq(vcpu, &irq, NULL);
773 static void stimer_expiration(struct kvm_vcpu_hv_stimer *stimer)
775 int r, direct = stimer->config.direct_mode;
777 stimer->msg_pending = true;
779 r = stimer_send_msg(stimer);
781 r = stimer_notify_direct(stimer);
782 trace_kvm_hv_stimer_expiration(stimer_to_vcpu(stimer)->vcpu_id,
783 stimer->index, direct, r);
785 stimer->msg_pending = false;
786 if (!(stimer->config.periodic))
787 stimer->config.enable = 0;
791 void kvm_hv_process_stimers(struct kvm_vcpu *vcpu)
793 struct kvm_vcpu_hv *hv_vcpu = vcpu_to_hv_vcpu(vcpu);
794 struct kvm_vcpu_hv_stimer *stimer;
795 u64 time_now, exp_time;
798 for (i = 0; i < ARRAY_SIZE(hv_vcpu->stimer); i++)
799 if (test_and_clear_bit(i, hv_vcpu->stimer_pending_bitmap)) {
800 stimer = &hv_vcpu->stimer[i];
801 if (stimer->config.enable) {
802 exp_time = stimer->exp_time;
806 get_time_ref_counter(vcpu->kvm);
807 if (time_now >= exp_time)
808 stimer_expiration(stimer);
811 if ((stimer->config.enable) &&
813 if (!stimer->msg_pending)
814 stimer_start(stimer);
816 stimer_cleanup(stimer);
821 void kvm_hv_vcpu_uninit(struct kvm_vcpu *vcpu)
823 struct kvm_vcpu_hv *hv_vcpu = vcpu_to_hv_vcpu(vcpu);
826 for (i = 0; i < ARRAY_SIZE(hv_vcpu->stimer); i++)
827 stimer_cleanup(&hv_vcpu->stimer[i]);
830 bool kvm_hv_assist_page_enabled(struct kvm_vcpu *vcpu)
832 if (!(vcpu->arch.hyperv.hv_vapic & HV_X64_MSR_VP_ASSIST_PAGE_ENABLE))
834 return vcpu->arch.pv_eoi.msr_val & KVM_MSR_ENABLED;
836 EXPORT_SYMBOL_GPL(kvm_hv_assist_page_enabled);
838 bool kvm_hv_get_assist_page(struct kvm_vcpu *vcpu,
839 struct hv_vp_assist_page *assist_page)
841 if (!kvm_hv_assist_page_enabled(vcpu))
843 return !kvm_read_guest_cached(vcpu->kvm, &vcpu->arch.pv_eoi.data,
844 assist_page, sizeof(*assist_page));
846 EXPORT_SYMBOL_GPL(kvm_hv_get_assist_page);
848 static void stimer_prepare_msg(struct kvm_vcpu_hv_stimer *stimer)
850 struct hv_message *msg = &stimer->msg;
851 struct hv_timer_message_payload *payload =
852 (struct hv_timer_message_payload *)&msg->u.payload;
854 memset(&msg->header, 0, sizeof(msg->header));
855 msg->header.message_type = HVMSG_TIMER_EXPIRED;
856 msg->header.payload_size = sizeof(*payload);
858 payload->timer_index = stimer->index;
859 payload->expiration_time = 0;
860 payload->delivery_time = 0;
863 static void stimer_init(struct kvm_vcpu_hv_stimer *stimer, int timer_index)
865 memset(stimer, 0, sizeof(*stimer));
866 stimer->index = timer_index;
867 hrtimer_init(&stimer->timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
868 stimer->timer.function = stimer_timer_callback;
869 stimer_prepare_msg(stimer);
872 void kvm_hv_vcpu_init(struct kvm_vcpu *vcpu)
874 struct kvm_vcpu_hv *hv_vcpu = vcpu_to_hv_vcpu(vcpu);
877 synic_init(&hv_vcpu->synic);
879 bitmap_zero(hv_vcpu->stimer_pending_bitmap, HV_SYNIC_STIMER_COUNT);
880 for (i = 0; i < ARRAY_SIZE(hv_vcpu->stimer); i++)
881 stimer_init(&hv_vcpu->stimer[i], i);
884 void kvm_hv_vcpu_postcreate(struct kvm_vcpu *vcpu)
886 struct kvm_vcpu_hv *hv_vcpu = vcpu_to_hv_vcpu(vcpu);
888 hv_vcpu->vp_index = kvm_vcpu_get_idx(vcpu);
891 int kvm_hv_activate_synic(struct kvm_vcpu *vcpu, bool dont_zero_synic_pages)
893 struct kvm_vcpu_hv_synic *synic = vcpu_to_synic(vcpu);
896 * Hyper-V SynIC auto EOI SINT's are
897 * not compatible with APICV, so request
898 * to deactivate APICV permanently.
900 kvm_request_apicv_update(vcpu->kvm, false, APICV_INHIBIT_REASON_HYPERV);
901 synic->active = true;
902 synic->dont_zero_synic_pages = dont_zero_synic_pages;
903 synic->control = HV_SYNIC_CONTROL_ENABLE;
907 static bool kvm_hv_msr_partition_wide(u32 msr)
912 case HV_X64_MSR_GUEST_OS_ID:
913 case HV_X64_MSR_HYPERCALL:
914 case HV_X64_MSR_REFERENCE_TSC:
915 case HV_X64_MSR_TIME_REF_COUNT:
916 case HV_X64_MSR_CRASH_CTL:
917 case HV_X64_MSR_CRASH_P0 ... HV_X64_MSR_CRASH_P4:
918 case HV_X64_MSR_RESET:
919 case HV_X64_MSR_REENLIGHTENMENT_CONTROL:
920 case HV_X64_MSR_TSC_EMULATION_CONTROL:
921 case HV_X64_MSR_TSC_EMULATION_STATUS:
922 case HV_X64_MSR_SYNDBG_OPTIONS:
923 case HV_X64_MSR_SYNDBG_CONTROL ... HV_X64_MSR_SYNDBG_PENDING_BUFFER:
931 static int kvm_hv_msr_get_crash_data(struct kvm_vcpu *vcpu,
932 u32 index, u64 *pdata)
934 struct kvm_hv *hv = &vcpu->kvm->arch.hyperv;
935 size_t size = ARRAY_SIZE(hv->hv_crash_param);
937 if (WARN_ON_ONCE(index >= size))
940 *pdata = hv->hv_crash_param[array_index_nospec(index, size)];
944 static int kvm_hv_msr_get_crash_ctl(struct kvm_vcpu *vcpu, u64 *pdata)
946 struct kvm_hv *hv = &vcpu->kvm->arch.hyperv;
948 *pdata = hv->hv_crash_ctl;
952 static int kvm_hv_msr_set_crash_ctl(struct kvm_vcpu *vcpu, u64 data, bool host)
954 struct kvm_hv *hv = &vcpu->kvm->arch.hyperv;
957 hv->hv_crash_ctl = data & HV_CRASH_CTL_CRASH_NOTIFY;
959 if (!host && (data & HV_CRASH_CTL_CRASH_NOTIFY)) {
961 vcpu_debug(vcpu, "hv crash (0x%llx 0x%llx 0x%llx 0x%llx 0x%llx)\n",
962 hv->hv_crash_param[0],
963 hv->hv_crash_param[1],
964 hv->hv_crash_param[2],
965 hv->hv_crash_param[3],
966 hv->hv_crash_param[4]);
968 /* Send notification about crash to user space */
969 kvm_make_request(KVM_REQ_HV_CRASH, vcpu);
975 static int kvm_hv_msr_set_crash_data(struct kvm_vcpu *vcpu,
978 struct kvm_hv *hv = &vcpu->kvm->arch.hyperv;
979 size_t size = ARRAY_SIZE(hv->hv_crash_param);
981 if (WARN_ON_ONCE(index >= size))
984 hv->hv_crash_param[array_index_nospec(index, size)] = data;
989 * The kvmclock and Hyper-V TSC page use similar formulas, and converting
990 * between them is possible:
993 * nsec = (ticks - tsc_timestamp) * tsc_to_system_mul * 2^(tsc_shift-32)
997 * nsec/100 = ticks * scale / 2^64 + offset
999 * When tsc_timestamp = system_time = 0, offset is zero in the Hyper-V formula.
1000 * By dividing the kvmclock formula by 100 and equating what's left we get:
1001 * ticks * scale / 2^64 = ticks * tsc_to_system_mul * 2^(tsc_shift-32) / 100
1002 * scale / 2^64 = tsc_to_system_mul * 2^(tsc_shift-32) / 100
1003 * scale = tsc_to_system_mul * 2^(32+tsc_shift) / 100
1005 * Now expand the kvmclock formula and divide by 100:
1006 * nsec = ticks * tsc_to_system_mul * 2^(tsc_shift-32)
1007 * - tsc_timestamp * tsc_to_system_mul * 2^(tsc_shift-32)
1009 * nsec/100 = ticks * tsc_to_system_mul * 2^(tsc_shift-32) / 100
1010 * - tsc_timestamp * tsc_to_system_mul * 2^(tsc_shift-32) / 100
1011 * + system_time / 100
1013 * Replace tsc_to_system_mul * 2^(tsc_shift-32) / 100 by scale / 2^64:
1014 * nsec/100 = ticks * scale / 2^64
1015 * - tsc_timestamp * scale / 2^64
1016 * + system_time / 100
1018 * Equate with the Hyper-V formula so that ticks * scale / 2^64 cancels out:
1019 * offset = system_time / 100 - tsc_timestamp * scale / 2^64
1021 * These two equivalencies are implemented in this function.
1023 static bool compute_tsc_page_parameters(struct pvclock_vcpu_time_info *hv_clock,
1024 struct ms_hyperv_tsc_page *tsc_ref)
1028 if (!(hv_clock->flags & PVCLOCK_TSC_STABLE_BIT))
1032 * check if scale would overflow, if so we use the time ref counter
1033 * tsc_to_system_mul * 2^(tsc_shift+32) / 100 >= 2^64
1034 * tsc_to_system_mul / 100 >= 2^(32-tsc_shift)
1035 * tsc_to_system_mul >= 100 * 2^(32-tsc_shift)
1037 max_mul = 100ull << (32 - hv_clock->tsc_shift);
1038 if (hv_clock->tsc_to_system_mul >= max_mul)
1042 * Otherwise compute the scale and offset according to the formulas
1045 tsc_ref->tsc_scale =
1046 mul_u64_u32_div(1ULL << (32 + hv_clock->tsc_shift),
1047 hv_clock->tsc_to_system_mul,
1050 tsc_ref->tsc_offset = hv_clock->system_time;
1051 do_div(tsc_ref->tsc_offset, 100);
1052 tsc_ref->tsc_offset -=
1053 mul_u64_u64_shr(hv_clock->tsc_timestamp, tsc_ref->tsc_scale, 64);
1057 void kvm_hv_setup_tsc_page(struct kvm *kvm,
1058 struct pvclock_vcpu_time_info *hv_clock)
1060 struct kvm_hv *hv = &kvm->arch.hyperv;
1064 BUILD_BUG_ON(sizeof(tsc_seq) != sizeof(hv->tsc_ref.tsc_sequence));
1065 BUILD_BUG_ON(offsetof(struct ms_hyperv_tsc_page, tsc_sequence) != 0);
1067 if (!(hv->hv_tsc_page & HV_X64_MSR_TSC_REFERENCE_ENABLE))
1070 mutex_lock(&kvm->arch.hyperv.hv_lock);
1071 if (!(hv->hv_tsc_page & HV_X64_MSR_TSC_REFERENCE_ENABLE))
1074 gfn = hv->hv_tsc_page >> HV_X64_MSR_TSC_REFERENCE_ADDRESS_SHIFT;
1076 * Because the TSC parameters only vary when there is a
1077 * change in the master clock, do not bother with caching.
1079 if (unlikely(kvm_read_guest(kvm, gfn_to_gpa(gfn),
1080 &tsc_seq, sizeof(tsc_seq))))
1084 * While we're computing and writing the parameters, force the
1085 * guest to use the time reference count MSR.
1087 hv->tsc_ref.tsc_sequence = 0;
1088 if (kvm_write_guest(kvm, gfn_to_gpa(gfn),
1089 &hv->tsc_ref, sizeof(hv->tsc_ref.tsc_sequence)))
1092 if (!compute_tsc_page_parameters(hv_clock, &hv->tsc_ref))
1095 /* Ensure sequence is zero before writing the rest of the struct. */
1097 if (kvm_write_guest(kvm, gfn_to_gpa(gfn), &hv->tsc_ref, sizeof(hv->tsc_ref)))
1101 * Now switch to the TSC page mechanism by writing the sequence.
1104 if (tsc_seq == 0xFFFFFFFF || tsc_seq == 0)
1107 /* Write the struct entirely before the non-zero sequence. */
1110 hv->tsc_ref.tsc_sequence = tsc_seq;
1111 kvm_write_guest(kvm, gfn_to_gpa(gfn),
1112 &hv->tsc_ref, sizeof(hv->tsc_ref.tsc_sequence));
1114 mutex_unlock(&kvm->arch.hyperv.hv_lock);
1117 static int kvm_hv_set_msr_pw(struct kvm_vcpu *vcpu, u32 msr, u64 data,
1120 struct kvm *kvm = vcpu->kvm;
1121 struct kvm_hv *hv = &kvm->arch.hyperv;
1124 case HV_X64_MSR_GUEST_OS_ID:
1125 hv->hv_guest_os_id = data;
1126 /* setting guest os id to zero disables hypercall page */
1127 if (!hv->hv_guest_os_id)
1128 hv->hv_hypercall &= ~HV_X64_MSR_HYPERCALL_ENABLE;
1130 case HV_X64_MSR_HYPERCALL: {
1135 /* if guest os id is not set hypercall should remain disabled */
1136 if (!hv->hv_guest_os_id)
1138 if (!(data & HV_X64_MSR_HYPERCALL_ENABLE)) {
1139 hv->hv_hypercall = data;
1142 gfn = data >> HV_X64_MSR_HYPERCALL_PAGE_ADDRESS_SHIFT;
1143 addr = gfn_to_hva(kvm, gfn);
1144 if (kvm_is_error_hva(addr))
1146 kvm_x86_ops.patch_hypercall(vcpu, instructions);
1147 ((unsigned char *)instructions)[3] = 0xc3; /* ret */
1148 if (__copy_to_user((void __user *)addr, instructions, 4))
1150 hv->hv_hypercall = data;
1151 mark_page_dirty(kvm, gfn);
1154 case HV_X64_MSR_REFERENCE_TSC:
1155 hv->hv_tsc_page = data;
1156 if (hv->hv_tsc_page & HV_X64_MSR_TSC_REFERENCE_ENABLE)
1157 kvm_make_request(KVM_REQ_MASTERCLOCK_UPDATE, vcpu);
1159 case HV_X64_MSR_CRASH_P0 ... HV_X64_MSR_CRASH_P4:
1160 return kvm_hv_msr_set_crash_data(vcpu,
1161 msr - HV_X64_MSR_CRASH_P0,
1163 case HV_X64_MSR_CRASH_CTL:
1164 return kvm_hv_msr_set_crash_ctl(vcpu, data, host);
1165 case HV_X64_MSR_RESET:
1167 vcpu_debug(vcpu, "hyper-v reset requested\n");
1168 kvm_make_request(KVM_REQ_HV_RESET, vcpu);
1171 case HV_X64_MSR_REENLIGHTENMENT_CONTROL:
1172 hv->hv_reenlightenment_control = data;
1174 case HV_X64_MSR_TSC_EMULATION_CONTROL:
1175 hv->hv_tsc_emulation_control = data;
1177 case HV_X64_MSR_TSC_EMULATION_STATUS:
1178 hv->hv_tsc_emulation_status = data;
1180 case HV_X64_MSR_TIME_REF_COUNT:
1181 /* read-only, but still ignore it if host-initiated */
1185 case HV_X64_MSR_SYNDBG_OPTIONS:
1186 case HV_X64_MSR_SYNDBG_CONTROL ... HV_X64_MSR_SYNDBG_PENDING_BUFFER:
1187 return syndbg_set_msr(vcpu, msr, data, host);
1189 vcpu_unimpl(vcpu, "Hyper-V unhandled wrmsr: 0x%x data 0x%llx\n",
1196 /* Calculate cpu time spent by current task in 100ns units */
1197 static u64 current_task_runtime_100ns(void)
1201 task_cputime_adjusted(current, &utime, &stime);
1203 return div_u64(utime + stime, 100);
1206 static int kvm_hv_set_msr(struct kvm_vcpu *vcpu, u32 msr, u64 data, bool host)
1208 struct kvm_vcpu_hv *hv_vcpu = &vcpu->arch.hyperv;
1211 case HV_X64_MSR_VP_INDEX: {
1212 struct kvm_hv *hv = &vcpu->kvm->arch.hyperv;
1213 int vcpu_idx = kvm_vcpu_get_idx(vcpu);
1214 u32 new_vp_index = (u32)data;
1216 if (!host || new_vp_index >= KVM_MAX_VCPUS)
1219 if (new_vp_index == hv_vcpu->vp_index)
1223 * The VP index is initialized to vcpu_index by
1224 * kvm_hv_vcpu_postcreate so they initially match. Now the
1225 * VP index is changing, adjust num_mismatched_vp_indexes if
1226 * it now matches or no longer matches vcpu_idx.
1228 if (hv_vcpu->vp_index == vcpu_idx)
1229 atomic_inc(&hv->num_mismatched_vp_indexes);
1230 else if (new_vp_index == vcpu_idx)
1231 atomic_dec(&hv->num_mismatched_vp_indexes);
1233 hv_vcpu->vp_index = new_vp_index;
1236 case HV_X64_MSR_VP_ASSIST_PAGE: {
1240 if (!(data & HV_X64_MSR_VP_ASSIST_PAGE_ENABLE)) {
1241 hv_vcpu->hv_vapic = data;
1242 if (kvm_lapic_enable_pv_eoi(vcpu, 0, 0))
1246 gfn = data >> HV_X64_MSR_VP_ASSIST_PAGE_ADDRESS_SHIFT;
1247 addr = kvm_vcpu_gfn_to_hva(vcpu, gfn);
1248 if (kvm_is_error_hva(addr))
1252 * Clear apic_assist portion of struct hv_vp_assist_page
1253 * only, there can be valuable data in the rest which needs
1254 * to be preserved e.g. on migration.
1256 if (__put_user(0, (u32 __user *)addr))
1258 hv_vcpu->hv_vapic = data;
1259 kvm_vcpu_mark_page_dirty(vcpu, gfn);
1260 if (kvm_lapic_enable_pv_eoi(vcpu,
1261 gfn_to_gpa(gfn) | KVM_MSR_ENABLED,
1262 sizeof(struct hv_vp_assist_page)))
1266 case HV_X64_MSR_EOI:
1267 return kvm_hv_vapic_msr_write(vcpu, APIC_EOI, data);
1268 case HV_X64_MSR_ICR:
1269 return kvm_hv_vapic_msr_write(vcpu, APIC_ICR, data);
1270 case HV_X64_MSR_TPR:
1271 return kvm_hv_vapic_msr_write(vcpu, APIC_TASKPRI, data);
1272 case HV_X64_MSR_VP_RUNTIME:
1275 hv_vcpu->runtime_offset = data - current_task_runtime_100ns();
1277 case HV_X64_MSR_SCONTROL:
1278 case HV_X64_MSR_SVERSION:
1279 case HV_X64_MSR_SIEFP:
1280 case HV_X64_MSR_SIMP:
1281 case HV_X64_MSR_EOM:
1282 case HV_X64_MSR_SINT0 ... HV_X64_MSR_SINT15:
1283 return synic_set_msr(vcpu_to_synic(vcpu), msr, data, host);
1284 case HV_X64_MSR_STIMER0_CONFIG:
1285 case HV_X64_MSR_STIMER1_CONFIG:
1286 case HV_X64_MSR_STIMER2_CONFIG:
1287 case HV_X64_MSR_STIMER3_CONFIG: {
1288 int timer_index = (msr - HV_X64_MSR_STIMER0_CONFIG)/2;
1290 return stimer_set_config(vcpu_to_stimer(vcpu, timer_index),
1293 case HV_X64_MSR_STIMER0_COUNT:
1294 case HV_X64_MSR_STIMER1_COUNT:
1295 case HV_X64_MSR_STIMER2_COUNT:
1296 case HV_X64_MSR_STIMER3_COUNT: {
1297 int timer_index = (msr - HV_X64_MSR_STIMER0_COUNT)/2;
1299 return stimer_set_count(vcpu_to_stimer(vcpu, timer_index),
1302 case HV_X64_MSR_TSC_FREQUENCY:
1303 case HV_X64_MSR_APIC_FREQUENCY:
1304 /* read-only, but still ignore it if host-initiated */
1309 vcpu_unimpl(vcpu, "Hyper-V unhandled wrmsr: 0x%x data 0x%llx\n",
1317 static int kvm_hv_get_msr_pw(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata,
1321 struct kvm *kvm = vcpu->kvm;
1322 struct kvm_hv *hv = &kvm->arch.hyperv;
1325 case HV_X64_MSR_GUEST_OS_ID:
1326 data = hv->hv_guest_os_id;
1328 case HV_X64_MSR_HYPERCALL:
1329 data = hv->hv_hypercall;
1331 case HV_X64_MSR_TIME_REF_COUNT:
1332 data = get_time_ref_counter(kvm);
1334 case HV_X64_MSR_REFERENCE_TSC:
1335 data = hv->hv_tsc_page;
1337 case HV_X64_MSR_CRASH_P0 ... HV_X64_MSR_CRASH_P4:
1338 return kvm_hv_msr_get_crash_data(vcpu,
1339 msr - HV_X64_MSR_CRASH_P0,
1341 case HV_X64_MSR_CRASH_CTL:
1342 return kvm_hv_msr_get_crash_ctl(vcpu, pdata);
1343 case HV_X64_MSR_RESET:
1346 case HV_X64_MSR_REENLIGHTENMENT_CONTROL:
1347 data = hv->hv_reenlightenment_control;
1349 case HV_X64_MSR_TSC_EMULATION_CONTROL:
1350 data = hv->hv_tsc_emulation_control;
1352 case HV_X64_MSR_TSC_EMULATION_STATUS:
1353 data = hv->hv_tsc_emulation_status;
1355 case HV_X64_MSR_SYNDBG_OPTIONS:
1356 case HV_X64_MSR_SYNDBG_CONTROL ... HV_X64_MSR_SYNDBG_PENDING_BUFFER:
1357 return syndbg_get_msr(vcpu, msr, pdata, host);
1359 vcpu_unimpl(vcpu, "Hyper-V unhandled rdmsr: 0x%x\n", msr);
1367 static int kvm_hv_get_msr(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata,
1371 struct kvm_vcpu_hv *hv_vcpu = &vcpu->arch.hyperv;
1374 case HV_X64_MSR_VP_INDEX:
1375 data = hv_vcpu->vp_index;
1377 case HV_X64_MSR_EOI:
1378 return kvm_hv_vapic_msr_read(vcpu, APIC_EOI, pdata);
1379 case HV_X64_MSR_ICR:
1380 return kvm_hv_vapic_msr_read(vcpu, APIC_ICR, pdata);
1381 case HV_X64_MSR_TPR:
1382 return kvm_hv_vapic_msr_read(vcpu, APIC_TASKPRI, pdata);
1383 case HV_X64_MSR_VP_ASSIST_PAGE:
1384 data = hv_vcpu->hv_vapic;
1386 case HV_X64_MSR_VP_RUNTIME:
1387 data = current_task_runtime_100ns() + hv_vcpu->runtime_offset;
1389 case HV_X64_MSR_SCONTROL:
1390 case HV_X64_MSR_SVERSION:
1391 case HV_X64_MSR_SIEFP:
1392 case HV_X64_MSR_SIMP:
1393 case HV_X64_MSR_EOM:
1394 case HV_X64_MSR_SINT0 ... HV_X64_MSR_SINT15:
1395 return synic_get_msr(vcpu_to_synic(vcpu), msr, pdata, host);
1396 case HV_X64_MSR_STIMER0_CONFIG:
1397 case HV_X64_MSR_STIMER1_CONFIG:
1398 case HV_X64_MSR_STIMER2_CONFIG:
1399 case HV_X64_MSR_STIMER3_CONFIG: {
1400 int timer_index = (msr - HV_X64_MSR_STIMER0_CONFIG)/2;
1402 return stimer_get_config(vcpu_to_stimer(vcpu, timer_index),
1405 case HV_X64_MSR_STIMER0_COUNT:
1406 case HV_X64_MSR_STIMER1_COUNT:
1407 case HV_X64_MSR_STIMER2_COUNT:
1408 case HV_X64_MSR_STIMER3_COUNT: {
1409 int timer_index = (msr - HV_X64_MSR_STIMER0_COUNT)/2;
1411 return stimer_get_count(vcpu_to_stimer(vcpu, timer_index),
1414 case HV_X64_MSR_TSC_FREQUENCY:
1415 data = (u64)vcpu->arch.virtual_tsc_khz * 1000;
1417 case HV_X64_MSR_APIC_FREQUENCY:
1418 data = APIC_BUS_FREQUENCY;
1421 vcpu_unimpl(vcpu, "Hyper-V unhandled rdmsr: 0x%x\n", msr);
1428 int kvm_hv_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data, bool host)
1430 if (kvm_hv_msr_partition_wide(msr)) {
1433 mutex_lock(&vcpu->kvm->arch.hyperv.hv_lock);
1434 r = kvm_hv_set_msr_pw(vcpu, msr, data, host);
1435 mutex_unlock(&vcpu->kvm->arch.hyperv.hv_lock);
1438 return kvm_hv_set_msr(vcpu, msr, data, host);
1441 int kvm_hv_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata, bool host)
1443 if (kvm_hv_msr_partition_wide(msr)) {
1446 mutex_lock(&vcpu->kvm->arch.hyperv.hv_lock);
1447 r = kvm_hv_get_msr_pw(vcpu, msr, pdata, host);
1448 mutex_unlock(&vcpu->kvm->arch.hyperv.hv_lock);
1451 return kvm_hv_get_msr(vcpu, msr, pdata, host);
1454 static __always_inline unsigned long *sparse_set_to_vcpu_mask(
1455 struct kvm *kvm, u64 *sparse_banks, u64 valid_bank_mask,
1456 u64 *vp_bitmap, unsigned long *vcpu_bitmap)
1458 struct kvm_hv *hv = &kvm->arch.hyperv;
1459 struct kvm_vcpu *vcpu;
1460 int i, bank, sbank = 0;
1462 memset(vp_bitmap, 0,
1463 KVM_HV_MAX_SPARSE_VCPU_SET_BITS * sizeof(*vp_bitmap));
1464 for_each_set_bit(bank, (unsigned long *)&valid_bank_mask,
1465 KVM_HV_MAX_SPARSE_VCPU_SET_BITS)
1466 vp_bitmap[bank] = sparse_banks[sbank++];
1468 if (likely(!atomic_read(&hv->num_mismatched_vp_indexes))) {
1469 /* for all vcpus vp_index == vcpu_idx */
1470 return (unsigned long *)vp_bitmap;
1473 bitmap_zero(vcpu_bitmap, KVM_MAX_VCPUS);
1474 kvm_for_each_vcpu(i, vcpu, kvm) {
1475 if (test_bit(vcpu_to_hv_vcpu(vcpu)->vp_index,
1476 (unsigned long *)vp_bitmap))
1477 __set_bit(i, vcpu_bitmap);
1482 static u64 kvm_hv_flush_tlb(struct kvm_vcpu *current_vcpu, u64 ingpa,
1483 u16 rep_cnt, bool ex)
1485 struct kvm *kvm = current_vcpu->kvm;
1486 struct kvm_vcpu_hv *hv_vcpu = ¤t_vcpu->arch.hyperv;
1487 struct hv_tlb_flush_ex flush_ex;
1488 struct hv_tlb_flush flush;
1489 u64 vp_bitmap[KVM_HV_MAX_SPARSE_VCPU_SET_BITS];
1490 DECLARE_BITMAP(vcpu_bitmap, KVM_MAX_VCPUS);
1491 unsigned long *vcpu_mask;
1492 u64 valid_bank_mask;
1493 u64 sparse_banks[64];
1494 int sparse_banks_len;
1498 if (unlikely(kvm_read_guest(kvm, ingpa, &flush, sizeof(flush))))
1499 return HV_STATUS_INVALID_HYPERCALL_INPUT;
1501 trace_kvm_hv_flush_tlb(flush.processor_mask,
1502 flush.address_space, flush.flags);
1504 valid_bank_mask = BIT_ULL(0);
1505 sparse_banks[0] = flush.processor_mask;
1508 * Work around possible WS2012 bug: it sends hypercalls
1509 * with processor_mask = 0x0 and HV_FLUSH_ALL_PROCESSORS clear,
1510 * while also expecting us to flush something and crashing if
1511 * we don't. Let's treat processor_mask == 0 same as
1512 * HV_FLUSH_ALL_PROCESSORS.
1514 all_cpus = (flush.flags & HV_FLUSH_ALL_PROCESSORS) ||
1515 flush.processor_mask == 0;
1517 if (unlikely(kvm_read_guest(kvm, ingpa, &flush_ex,
1519 return HV_STATUS_INVALID_HYPERCALL_INPUT;
1521 trace_kvm_hv_flush_tlb_ex(flush_ex.hv_vp_set.valid_bank_mask,
1522 flush_ex.hv_vp_set.format,
1523 flush_ex.address_space,
1526 valid_bank_mask = flush_ex.hv_vp_set.valid_bank_mask;
1527 all_cpus = flush_ex.hv_vp_set.format !=
1528 HV_GENERIC_SET_SPARSE_4K;
1531 bitmap_weight((unsigned long *)&valid_bank_mask, 64) *
1532 sizeof(sparse_banks[0]);
1534 if (!sparse_banks_len && !all_cpus)
1539 ingpa + offsetof(struct hv_tlb_flush_ex,
1540 hv_vp_set.bank_contents),
1543 return HV_STATUS_INVALID_HYPERCALL_INPUT;
1546 cpumask_clear(&hv_vcpu->tlb_flush);
1548 vcpu_mask = all_cpus ? NULL :
1549 sparse_set_to_vcpu_mask(kvm, sparse_banks, valid_bank_mask,
1550 vp_bitmap, vcpu_bitmap);
1553 * vcpu->arch.cr3 may not be up-to-date for running vCPUs so we can't
1554 * analyze it here, flush TLB regardless of the specified address space.
1556 kvm_make_vcpus_request_mask(kvm, KVM_REQ_HV_TLB_FLUSH,
1557 NULL, vcpu_mask, &hv_vcpu->tlb_flush);
1560 /* We always do full TLB flush, set rep_done = rep_cnt. */
1561 return (u64)HV_STATUS_SUCCESS |
1562 ((u64)rep_cnt << HV_HYPERCALL_REP_COMP_OFFSET);
1565 static void kvm_send_ipi_to_many(struct kvm *kvm, u32 vector,
1566 unsigned long *vcpu_bitmap)
1568 struct kvm_lapic_irq irq = {
1569 .delivery_mode = APIC_DM_FIXED,
1572 struct kvm_vcpu *vcpu;
1575 kvm_for_each_vcpu(i, vcpu, kvm) {
1576 if (vcpu_bitmap && !test_bit(i, vcpu_bitmap))
1579 /* We fail only when APIC is disabled */
1580 kvm_apic_set_irq(vcpu, &irq, NULL);
1584 static u64 kvm_hv_send_ipi(struct kvm_vcpu *current_vcpu, u64 ingpa, u64 outgpa,
1587 struct kvm *kvm = current_vcpu->kvm;
1588 struct hv_send_ipi_ex send_ipi_ex;
1589 struct hv_send_ipi send_ipi;
1590 u64 vp_bitmap[KVM_HV_MAX_SPARSE_VCPU_SET_BITS];
1591 DECLARE_BITMAP(vcpu_bitmap, KVM_MAX_VCPUS);
1592 unsigned long *vcpu_mask;
1593 unsigned long valid_bank_mask;
1594 u64 sparse_banks[64];
1595 int sparse_banks_len;
1601 if (unlikely(kvm_read_guest(kvm, ingpa, &send_ipi,
1603 return HV_STATUS_INVALID_HYPERCALL_INPUT;
1604 sparse_banks[0] = send_ipi.cpu_mask;
1605 vector = send_ipi.vector;
1607 /* 'reserved' part of hv_send_ipi should be 0 */
1608 if (unlikely(ingpa >> 32 != 0))
1609 return HV_STATUS_INVALID_HYPERCALL_INPUT;
1610 sparse_banks[0] = outgpa;
1611 vector = (u32)ingpa;
1614 valid_bank_mask = BIT_ULL(0);
1616 trace_kvm_hv_send_ipi(vector, sparse_banks[0]);
1618 if (unlikely(kvm_read_guest(kvm, ingpa, &send_ipi_ex,
1619 sizeof(send_ipi_ex))))
1620 return HV_STATUS_INVALID_HYPERCALL_INPUT;
1622 trace_kvm_hv_send_ipi_ex(send_ipi_ex.vector,
1623 send_ipi_ex.vp_set.format,
1624 send_ipi_ex.vp_set.valid_bank_mask);
1626 vector = send_ipi_ex.vector;
1627 valid_bank_mask = send_ipi_ex.vp_set.valid_bank_mask;
1628 sparse_banks_len = bitmap_weight(&valid_bank_mask, 64) *
1629 sizeof(sparse_banks[0]);
1631 all_cpus = send_ipi_ex.vp_set.format == HV_GENERIC_SET_ALL;
1633 if (!sparse_banks_len)
1638 ingpa + offsetof(struct hv_send_ipi_ex,
1639 vp_set.bank_contents),
1642 return HV_STATUS_INVALID_HYPERCALL_INPUT;
1645 if ((vector < HV_IPI_LOW_VECTOR) || (vector > HV_IPI_HIGH_VECTOR))
1646 return HV_STATUS_INVALID_HYPERCALL_INPUT;
1648 vcpu_mask = all_cpus ? NULL :
1649 sparse_set_to_vcpu_mask(kvm, sparse_banks, valid_bank_mask,
1650 vp_bitmap, vcpu_bitmap);
1652 kvm_send_ipi_to_many(kvm, vector, vcpu_mask);
1655 return HV_STATUS_SUCCESS;
1658 bool kvm_hv_hypercall_enabled(struct kvm *kvm)
1660 return READ_ONCE(kvm->arch.hyperv.hv_guest_os_id) != 0;
1663 static void kvm_hv_hypercall_set_result(struct kvm_vcpu *vcpu, u64 result)
1667 longmode = is_64_bit_mode(vcpu);
1669 kvm_rax_write(vcpu, result);
1671 kvm_rdx_write(vcpu, result >> 32);
1672 kvm_rax_write(vcpu, result & 0xffffffff);
1676 static int kvm_hv_hypercall_complete(struct kvm_vcpu *vcpu, u64 result)
1678 kvm_hv_hypercall_set_result(vcpu, result);
1679 ++vcpu->stat.hypercalls;
1680 return kvm_skip_emulated_instruction(vcpu);
1683 static int kvm_hv_hypercall_complete_userspace(struct kvm_vcpu *vcpu)
1685 return kvm_hv_hypercall_complete(vcpu, vcpu->run->hyperv.u.hcall.result);
1688 static u16 kvm_hvcall_signal_event(struct kvm_vcpu *vcpu, bool fast, u64 param)
1690 struct eventfd_ctx *eventfd;
1692 if (unlikely(!fast)) {
1696 if ((gpa & (__alignof__(param) - 1)) ||
1697 offset_in_page(gpa) + sizeof(param) > PAGE_SIZE)
1698 return HV_STATUS_INVALID_ALIGNMENT;
1700 ret = kvm_vcpu_read_guest(vcpu, gpa, ¶m, sizeof(param));
1702 return HV_STATUS_INVALID_ALIGNMENT;
1706 * Per spec, bits 32-47 contain the extra "flag number". However, we
1707 * have no use for it, and in all known usecases it is zero, so just
1708 * report lookup failure if it isn't.
1710 if (param & 0xffff00000000ULL)
1711 return HV_STATUS_INVALID_PORT_ID;
1712 /* remaining bits are reserved-zero */
1713 if (param & ~KVM_HYPERV_CONN_ID_MASK)
1714 return HV_STATUS_INVALID_HYPERCALL_INPUT;
1716 /* the eventfd is protected by vcpu->kvm->srcu, but conn_to_evt isn't */
1718 eventfd = idr_find(&vcpu->kvm->arch.hyperv.conn_to_evt, param);
1721 return HV_STATUS_INVALID_PORT_ID;
1723 eventfd_signal(eventfd, 1);
1724 return HV_STATUS_SUCCESS;
1727 int kvm_hv_hypercall(struct kvm_vcpu *vcpu)
1729 u64 param, ingpa, outgpa, ret = HV_STATUS_SUCCESS;
1730 uint16_t code, rep_idx, rep_cnt;
1734 * hypercall generates UD from non zero cpl and real mode
1737 if (kvm_x86_ops.get_cpl(vcpu) != 0 || !is_protmode(vcpu)) {
1738 kvm_queue_exception(vcpu, UD_VECTOR);
1742 #ifdef CONFIG_X86_64
1743 if (is_64_bit_mode(vcpu)) {
1744 param = kvm_rcx_read(vcpu);
1745 ingpa = kvm_rdx_read(vcpu);
1746 outgpa = kvm_r8_read(vcpu);
1750 param = ((u64)kvm_rdx_read(vcpu) << 32) |
1751 (kvm_rax_read(vcpu) & 0xffffffff);
1752 ingpa = ((u64)kvm_rbx_read(vcpu) << 32) |
1753 (kvm_rcx_read(vcpu) & 0xffffffff);
1754 outgpa = ((u64)kvm_rdi_read(vcpu) << 32) |
1755 (kvm_rsi_read(vcpu) & 0xffffffff);
1758 code = param & 0xffff;
1759 fast = !!(param & HV_HYPERCALL_FAST_BIT);
1760 rep_cnt = (param >> HV_HYPERCALL_REP_COMP_OFFSET) & 0xfff;
1761 rep_idx = (param >> HV_HYPERCALL_REP_START_OFFSET) & 0xfff;
1762 rep = !!(rep_cnt || rep_idx);
1764 trace_kvm_hv_hypercall(code, fast, rep_cnt, rep_idx, ingpa, outgpa);
1767 case HVCALL_NOTIFY_LONG_SPIN_WAIT:
1768 if (unlikely(rep)) {
1769 ret = HV_STATUS_INVALID_HYPERCALL_INPUT;
1772 kvm_vcpu_on_spin(vcpu, true);
1774 case HVCALL_SIGNAL_EVENT:
1775 if (unlikely(rep)) {
1776 ret = HV_STATUS_INVALID_HYPERCALL_INPUT;
1779 ret = kvm_hvcall_signal_event(vcpu, fast, ingpa);
1780 if (ret != HV_STATUS_INVALID_PORT_ID)
1782 fallthrough; /* maybe userspace knows this conn_id */
1783 case HVCALL_POST_MESSAGE:
1784 /* don't bother userspace if it has no way to handle it */
1785 if (unlikely(rep || !vcpu_to_synic(vcpu)->active)) {
1786 ret = HV_STATUS_INVALID_HYPERCALL_INPUT;
1789 vcpu->run->exit_reason = KVM_EXIT_HYPERV;
1790 vcpu->run->hyperv.type = KVM_EXIT_HYPERV_HCALL;
1791 vcpu->run->hyperv.u.hcall.input = param;
1792 vcpu->run->hyperv.u.hcall.params[0] = ingpa;
1793 vcpu->run->hyperv.u.hcall.params[1] = outgpa;
1794 vcpu->arch.complete_userspace_io =
1795 kvm_hv_hypercall_complete_userspace;
1797 case HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST:
1798 if (unlikely(fast || !rep_cnt || rep_idx)) {
1799 ret = HV_STATUS_INVALID_HYPERCALL_INPUT;
1802 ret = kvm_hv_flush_tlb(vcpu, ingpa, rep_cnt, false);
1804 case HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE:
1805 if (unlikely(fast || rep)) {
1806 ret = HV_STATUS_INVALID_HYPERCALL_INPUT;
1809 ret = kvm_hv_flush_tlb(vcpu, ingpa, rep_cnt, false);
1811 case HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST_EX:
1812 if (unlikely(fast || !rep_cnt || rep_idx)) {
1813 ret = HV_STATUS_INVALID_HYPERCALL_INPUT;
1816 ret = kvm_hv_flush_tlb(vcpu, ingpa, rep_cnt, true);
1818 case HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE_EX:
1819 if (unlikely(fast || rep)) {
1820 ret = HV_STATUS_INVALID_HYPERCALL_INPUT;
1823 ret = kvm_hv_flush_tlb(vcpu, ingpa, rep_cnt, true);
1825 case HVCALL_SEND_IPI:
1826 if (unlikely(rep)) {
1827 ret = HV_STATUS_INVALID_HYPERCALL_INPUT;
1830 ret = kvm_hv_send_ipi(vcpu, ingpa, outgpa, false, fast);
1832 case HVCALL_SEND_IPI_EX:
1833 if (unlikely(fast || rep)) {
1834 ret = HV_STATUS_INVALID_HYPERCALL_INPUT;
1837 ret = kvm_hv_send_ipi(vcpu, ingpa, outgpa, true, false);
1839 case HVCALL_POST_DEBUG_DATA:
1840 case HVCALL_RETRIEVE_DEBUG_DATA:
1841 if (unlikely(fast)) {
1842 ret = HV_STATUS_INVALID_PARAMETER;
1846 case HVCALL_RESET_DEBUG_SESSION: {
1847 struct kvm_hv_syndbg *syndbg = vcpu_to_hv_syndbg(vcpu);
1849 if (!kvm_hv_is_syndbg_enabled(vcpu)) {
1850 ret = HV_STATUS_INVALID_HYPERCALL_CODE;
1854 if (!(syndbg->options & HV_X64_SYNDBG_OPTION_USE_HCALLS)) {
1855 ret = HV_STATUS_OPERATION_DENIED;
1858 vcpu->run->exit_reason = KVM_EXIT_HYPERV;
1859 vcpu->run->hyperv.type = KVM_EXIT_HYPERV_HCALL;
1860 vcpu->run->hyperv.u.hcall.input = param;
1861 vcpu->run->hyperv.u.hcall.params[0] = ingpa;
1862 vcpu->run->hyperv.u.hcall.params[1] = outgpa;
1863 vcpu->arch.complete_userspace_io =
1864 kvm_hv_hypercall_complete_userspace;
1868 ret = HV_STATUS_INVALID_HYPERCALL_CODE;
1872 return kvm_hv_hypercall_complete(vcpu, ret);
1875 void kvm_hv_init_vm(struct kvm *kvm)
1877 mutex_init(&kvm->arch.hyperv.hv_lock);
1878 idr_init(&kvm->arch.hyperv.conn_to_evt);
1881 void kvm_hv_destroy_vm(struct kvm *kvm)
1883 struct eventfd_ctx *eventfd;
1886 idr_for_each_entry(&kvm->arch.hyperv.conn_to_evt, eventfd, i)
1887 eventfd_ctx_put(eventfd);
1888 idr_destroy(&kvm->arch.hyperv.conn_to_evt);
1891 static int kvm_hv_eventfd_assign(struct kvm *kvm, u32 conn_id, int fd)
1893 struct kvm_hv *hv = &kvm->arch.hyperv;
1894 struct eventfd_ctx *eventfd;
1897 eventfd = eventfd_ctx_fdget(fd);
1898 if (IS_ERR(eventfd))
1899 return PTR_ERR(eventfd);
1901 mutex_lock(&hv->hv_lock);
1902 ret = idr_alloc(&hv->conn_to_evt, eventfd, conn_id, conn_id + 1,
1903 GFP_KERNEL_ACCOUNT);
1904 mutex_unlock(&hv->hv_lock);
1911 eventfd_ctx_put(eventfd);
1915 static int kvm_hv_eventfd_deassign(struct kvm *kvm, u32 conn_id)
1917 struct kvm_hv *hv = &kvm->arch.hyperv;
1918 struct eventfd_ctx *eventfd;
1920 mutex_lock(&hv->hv_lock);
1921 eventfd = idr_remove(&hv->conn_to_evt, conn_id);
1922 mutex_unlock(&hv->hv_lock);
1927 synchronize_srcu(&kvm->srcu);
1928 eventfd_ctx_put(eventfd);
1932 int kvm_vm_ioctl_hv_eventfd(struct kvm *kvm, struct kvm_hyperv_eventfd *args)
1934 if ((args->flags & ~KVM_HYPERV_EVENTFD_DEASSIGN) ||
1935 (args->conn_id & ~KVM_HYPERV_CONN_ID_MASK))
1938 if (args->flags == KVM_HYPERV_EVENTFD_DEASSIGN)
1939 return kvm_hv_eventfd_deassign(kvm, args->conn_id);
1940 return kvm_hv_eventfd_assign(kvm, args->conn_id, args->fd);
1943 int kvm_vcpu_ioctl_get_hv_cpuid(struct kvm_vcpu *vcpu, struct kvm_cpuid2 *cpuid,
1944 struct kvm_cpuid_entry2 __user *entries)
1946 uint16_t evmcs_ver = 0;
1947 struct kvm_cpuid_entry2 cpuid_entries[] = {
1948 { .function = HYPERV_CPUID_VENDOR_AND_MAX_FUNCTIONS },
1949 { .function = HYPERV_CPUID_INTERFACE },
1950 { .function = HYPERV_CPUID_VERSION },
1951 { .function = HYPERV_CPUID_FEATURES },
1952 { .function = HYPERV_CPUID_ENLIGHTMENT_INFO },
1953 { .function = HYPERV_CPUID_IMPLEMENT_LIMITS },
1954 { .function = HYPERV_CPUID_SYNDBG_VENDOR_AND_MAX_FUNCTIONS },
1955 { .function = HYPERV_CPUID_SYNDBG_INTERFACE },
1956 { .function = HYPERV_CPUID_SYNDBG_PLATFORM_CAPABILITIES },
1957 { .function = HYPERV_CPUID_NESTED_FEATURES },
1959 int i, nent = ARRAY_SIZE(cpuid_entries);
1961 if (kvm_x86_ops.nested_ops->get_evmcs_version)
1962 evmcs_ver = kvm_x86_ops.nested_ops->get_evmcs_version(vcpu);
1964 /* Skip NESTED_FEATURES if eVMCS is not supported */
1968 if (cpuid->nent < nent)
1971 if (cpuid->nent > nent)
1974 for (i = 0; i < nent; i++) {
1975 struct kvm_cpuid_entry2 *ent = &cpuid_entries[i];
1978 switch (ent->function) {
1979 case HYPERV_CPUID_VENDOR_AND_MAX_FUNCTIONS:
1980 memcpy(signature, "Linux KVM Hv", 12);
1982 ent->eax = HYPERV_CPUID_SYNDBG_PLATFORM_CAPABILITIES;
1983 ent->ebx = signature[0];
1984 ent->ecx = signature[1];
1985 ent->edx = signature[2];
1988 case HYPERV_CPUID_INTERFACE:
1989 memcpy(signature, "Hv#1\0\0\0\0\0\0\0\0", 12);
1990 ent->eax = signature[0];
1993 case HYPERV_CPUID_VERSION:
1995 * We implement some Hyper-V 2016 functions so let's use
1998 ent->eax = 0x00003839;
1999 ent->ebx = 0x000A0000;
2002 case HYPERV_CPUID_FEATURES:
2003 ent->eax |= HV_X64_MSR_VP_RUNTIME_AVAILABLE;
2004 ent->eax |= HV_MSR_TIME_REF_COUNT_AVAILABLE;
2005 ent->eax |= HV_X64_MSR_SYNIC_AVAILABLE;
2006 ent->eax |= HV_MSR_SYNTIMER_AVAILABLE;
2007 ent->eax |= HV_X64_MSR_APIC_ACCESS_AVAILABLE;
2008 ent->eax |= HV_X64_MSR_HYPERCALL_AVAILABLE;
2009 ent->eax |= HV_X64_MSR_VP_INDEX_AVAILABLE;
2010 ent->eax |= HV_X64_MSR_RESET_AVAILABLE;
2011 ent->eax |= HV_MSR_REFERENCE_TSC_AVAILABLE;
2012 ent->eax |= HV_X64_ACCESS_FREQUENCY_MSRS;
2013 ent->eax |= HV_X64_ACCESS_REENLIGHTENMENT;
2015 ent->ebx |= HV_X64_POST_MESSAGES;
2016 ent->ebx |= HV_X64_SIGNAL_EVENTS;
2018 ent->edx |= HV_FEATURE_FREQUENCY_MSRS_AVAILABLE;
2019 ent->edx |= HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE;
2021 ent->ebx |= HV_DEBUGGING;
2022 ent->edx |= HV_X64_GUEST_DEBUGGING_AVAILABLE;
2023 ent->edx |= HV_FEATURE_DEBUG_MSRS_AVAILABLE;
2026 * Direct Synthetic timers only make sense with in-kernel
2029 if (lapic_in_kernel(vcpu))
2030 ent->edx |= HV_STIMER_DIRECT_MODE_AVAILABLE;
2034 case HYPERV_CPUID_ENLIGHTMENT_INFO:
2035 ent->eax |= HV_X64_REMOTE_TLB_FLUSH_RECOMMENDED;
2036 ent->eax |= HV_X64_APIC_ACCESS_RECOMMENDED;
2037 ent->eax |= HV_X64_RELAXED_TIMING_RECOMMENDED;
2038 ent->eax |= HV_X64_CLUSTER_IPI_RECOMMENDED;
2039 ent->eax |= HV_X64_EX_PROCESSOR_MASKS_RECOMMENDED;
2041 ent->eax |= HV_X64_ENLIGHTENED_VMCS_RECOMMENDED;
2042 if (!cpu_smt_possible())
2043 ent->eax |= HV_X64_NO_NONARCH_CORESHARING;
2045 * Default number of spinlock retry attempts, matches
2048 ent->ebx = 0x00000FFF;
2052 case HYPERV_CPUID_IMPLEMENT_LIMITS:
2053 /* Maximum number of virtual processors */
2054 ent->eax = KVM_MAX_VCPUS;
2056 * Maximum number of logical processors, matches
2063 case HYPERV_CPUID_NESTED_FEATURES:
2064 ent->eax = evmcs_ver;
2068 case HYPERV_CPUID_SYNDBG_VENDOR_AND_MAX_FUNCTIONS:
2069 memcpy(signature, "Linux KVM Hv", 12);
2072 ent->ebx = signature[0];
2073 ent->ecx = signature[1];
2074 ent->edx = signature[2];
2077 case HYPERV_CPUID_SYNDBG_INTERFACE:
2078 memcpy(signature, "VS#1\0\0\0\0\0\0\0\0", 12);
2079 ent->eax = signature[0];
2082 case HYPERV_CPUID_SYNDBG_PLATFORM_CAPABILITIES:
2083 ent->eax |= HV_X64_SYNDBG_CAP_ALLOW_KERNEL_DEBUGGING;
2091 if (copy_to_user(entries, cpuid_entries,
2092 nent * sizeof(struct kvm_cpuid_entry2)))