hyperv.c 33.1 KB
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/*
 * KVM Microsoft Hyper-V emulation
 *
 * derived from arch/x86/kvm/x86.c
 *
 * Copyright (C) 2006 Qumranet, Inc.
 * Copyright (C) 2008 Qumranet, Inc.
 * Copyright IBM Corporation, 2008
 * Copyright 2010 Red Hat, Inc. and/or its affiliates.
 * Copyright (C) 2015 Andrey Smetanin <asmetanin@virtuozzo.com>
 *
 * Authors:
 *   Avi Kivity   <avi@qumranet.com>
 *   Yaniv Kamay  <yaniv@qumranet.com>
 *   Amit Shah    <amit.shah@qumranet.com>
 *   Ben-Ami Yassour <benami@il.ibm.com>
 *   Andrey Smetanin <asmetanin@virtuozzo.com>
 *
 * This work is licensed under the terms of the GNU GPL, version 2.  See
 * the COPYING file in the top-level directory.
 *
 */

#include "x86.h"
#include "lapic.h"
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#include "ioapic.h"
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#include "hyperv.h"

#include <linux/kvm_host.h>
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#include <linux/highmem.h>
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#include <linux/sched/cputime.h>

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#include <asm/apicdef.h>
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#include <trace/events/kvm.h>

#include "trace.h"

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static inline u64 synic_read_sint(struct kvm_vcpu_hv_synic *synic, int sint)
{
	return atomic64_read(&synic->sint[sint]);
}

static inline int synic_get_sint_vector(u64 sint_value)
{
	if (sint_value & HV_SYNIC_SINT_MASKED)
		return -1;
	return sint_value & HV_SYNIC_SINT_VECTOR_MASK;
}

static bool synic_has_vector_connected(struct kvm_vcpu_hv_synic *synic,
				      int vector)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(synic->sint); i++) {
		if (synic_get_sint_vector(synic_read_sint(synic, i)) == vector)
			return true;
	}
	return false;
}

static bool synic_has_vector_auto_eoi(struct kvm_vcpu_hv_synic *synic,
				     int vector)
{
	int i;
	u64 sint_value;

	for (i = 0; i < ARRAY_SIZE(synic->sint); i++) {
		sint_value = synic_read_sint(synic, i);
		if (synic_get_sint_vector(sint_value) == vector &&
		    sint_value & HV_SYNIC_SINT_AUTO_EOI)
			return true;
	}
	return false;
}

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static int synic_set_sint(struct kvm_vcpu_hv_synic *synic, int sint,
			  u64 data, bool host)
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{
	int vector;

	vector = data & HV_SYNIC_SINT_VECTOR_MASK;
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	if (vector < 16 && !host)
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		return 1;
	/*
	 * Guest may configure multiple SINTs to use the same vector, so
	 * we maintain a bitmap of vectors handled by synic, and a
	 * bitmap of vectors with auto-eoi behavior.  The bitmaps are
	 * updated here, and atomically queried on fast paths.
	 */

	atomic64_set(&synic->sint[sint], data);

	if (synic_has_vector_connected(synic, vector))
		__set_bit(vector, synic->vec_bitmap);
	else
		__clear_bit(vector, synic->vec_bitmap);

	if (synic_has_vector_auto_eoi(synic, vector))
		__set_bit(vector, synic->auto_eoi_bitmap);
	else
		__clear_bit(vector, synic->auto_eoi_bitmap);

	/* Load SynIC vectors into EOI exit bitmap */
	kvm_make_request(KVM_REQ_SCAN_IOAPIC, synic_to_vcpu(synic));
	return 0;
}

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static struct kvm_vcpu *get_vcpu_by_vpidx(struct kvm *kvm, u32 vpidx)
{
	struct kvm_vcpu *vcpu = NULL;
	int i;

	if (vpidx < KVM_MAX_VCPUS)
		vcpu = kvm_get_vcpu(kvm, vpidx);
	if (vcpu && vcpu_to_hv_vcpu(vcpu)->vp_index == vpidx)
		return vcpu;
	kvm_for_each_vcpu(i, vcpu, kvm)
		if (vcpu_to_hv_vcpu(vcpu)->vp_index == vpidx)
			return vcpu;
	return NULL;
}

static struct kvm_vcpu_hv_synic *synic_get(struct kvm *kvm, u32 vpidx)
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{
	struct kvm_vcpu *vcpu;
	struct kvm_vcpu_hv_synic *synic;

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	vcpu = get_vcpu_by_vpidx(kvm, vpidx);
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	if (!vcpu)
		return NULL;
	synic = vcpu_to_synic(vcpu);
	return (synic->active) ? synic : NULL;
}

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static void synic_clear_sint_msg_pending(struct kvm_vcpu_hv_synic *synic,
					u32 sint)
{
	struct kvm_vcpu *vcpu = synic_to_vcpu(synic);
	struct page *page;
	gpa_t gpa;
	struct hv_message *msg;
	struct hv_message_page *msg_page;

	gpa = synic->msg_page & PAGE_MASK;
	page = kvm_vcpu_gfn_to_page(vcpu, gpa >> PAGE_SHIFT);
	if (is_error_page(page)) {
		vcpu_err(vcpu, "Hyper-V SynIC can't get msg page, gpa 0x%llx\n",
			 gpa);
		return;
	}
	msg_page = kmap_atomic(page);

	msg = &msg_page->sint_message[sint];
	msg->header.message_flags.msg_pending = 0;

	kunmap_atomic(msg_page);
	kvm_release_page_dirty(page);
	kvm_vcpu_mark_page_dirty(vcpu, gpa >> PAGE_SHIFT);
}

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static void kvm_hv_notify_acked_sint(struct kvm_vcpu *vcpu, u32 sint)
{
	struct kvm *kvm = vcpu->kvm;
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	struct kvm_vcpu_hv_synic *synic = vcpu_to_synic(vcpu);
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	struct kvm_vcpu_hv *hv_vcpu = vcpu_to_hv_vcpu(vcpu);
	struct kvm_vcpu_hv_stimer *stimer;
	int gsi, idx, stimers_pending;
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	trace_kvm_hv_notify_acked_sint(vcpu->vcpu_id, sint);
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	if (synic->msg_page & HV_SYNIC_SIMP_ENABLE)
		synic_clear_sint_msg_pending(synic, sint);

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	/* Try to deliver pending Hyper-V SynIC timers messages */
	stimers_pending = 0;
	for (idx = 0; idx < ARRAY_SIZE(hv_vcpu->stimer); idx++) {
		stimer = &hv_vcpu->stimer[idx];
		if (stimer->msg_pending &&
		    (stimer->config & HV_STIMER_ENABLE) &&
		    HV_STIMER_SINT(stimer->config) == sint) {
			set_bit(stimer->index,
				hv_vcpu->stimer_pending_bitmap);
			stimers_pending++;
		}
	}
	if (stimers_pending)
		kvm_make_request(KVM_REQ_HV_STIMER, vcpu);

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	idx = srcu_read_lock(&kvm->irq_srcu);
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	gsi = atomic_read(&synic->sint_to_gsi[sint]);
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	if (gsi != -1)
		kvm_notify_acked_gsi(kvm, gsi);
	srcu_read_unlock(&kvm->irq_srcu, idx);
}

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static void synic_exit(struct kvm_vcpu_hv_synic *synic, u32 msr)
{
	struct kvm_vcpu *vcpu = synic_to_vcpu(synic);
	struct kvm_vcpu_hv *hv_vcpu = &vcpu->arch.hyperv;

	hv_vcpu->exit.type = KVM_EXIT_HYPERV_SYNIC;
	hv_vcpu->exit.u.synic.msr = msr;
	hv_vcpu->exit.u.synic.control = synic->control;
	hv_vcpu->exit.u.synic.evt_page = synic->evt_page;
	hv_vcpu->exit.u.synic.msg_page = synic->msg_page;

	kvm_make_request(KVM_REQ_HV_EXIT, vcpu);
}

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static int synic_set_msr(struct kvm_vcpu_hv_synic *synic,
			 u32 msr, u64 data, bool host)
{
	struct kvm_vcpu *vcpu = synic_to_vcpu(synic);
	int ret;

	if (!synic->active)
		return 1;

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	trace_kvm_hv_synic_set_msr(vcpu->vcpu_id, msr, data, host);

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	ret = 0;
	switch (msr) {
	case HV_X64_MSR_SCONTROL:
		synic->control = data;
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		if (!host)
			synic_exit(synic, msr);
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		break;
	case HV_X64_MSR_SVERSION:
		if (!host) {
			ret = 1;
			break;
		}
		synic->version = data;
		break;
	case HV_X64_MSR_SIEFP:
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		if ((data & HV_SYNIC_SIEFP_ENABLE) && !host &&
		    !synic->dont_zero_synic_pages)
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			if (kvm_clear_guest(vcpu->kvm,
					    data & PAGE_MASK, PAGE_SIZE)) {
				ret = 1;
				break;
			}
		synic->evt_page = data;
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		if (!host)
			synic_exit(synic, msr);
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		break;
	case HV_X64_MSR_SIMP:
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		if ((data & HV_SYNIC_SIMP_ENABLE) && !host &&
		    !synic->dont_zero_synic_pages)
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			if (kvm_clear_guest(vcpu->kvm,
					    data & PAGE_MASK, PAGE_SIZE)) {
				ret = 1;
				break;
			}
		synic->msg_page = data;
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		if (!host)
			synic_exit(synic, msr);
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		break;
	case HV_X64_MSR_EOM: {
		int i;

		for (i = 0; i < ARRAY_SIZE(synic->sint); i++)
			kvm_hv_notify_acked_sint(vcpu, i);
		break;
	}
	case HV_X64_MSR_SINT0 ... HV_X64_MSR_SINT15:
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		ret = synic_set_sint(synic, msr - HV_X64_MSR_SINT0, data, host);
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		break;
	default:
		ret = 1;
		break;
	}
	return ret;
}

static int synic_get_msr(struct kvm_vcpu_hv_synic *synic, u32 msr, u64 *pdata)
{
	int ret;

	if (!synic->active)
		return 1;

	ret = 0;
	switch (msr) {
	case HV_X64_MSR_SCONTROL:
		*pdata = synic->control;
		break;
	case HV_X64_MSR_SVERSION:
		*pdata = synic->version;
		break;
	case HV_X64_MSR_SIEFP:
		*pdata = synic->evt_page;
		break;
	case HV_X64_MSR_SIMP:
		*pdata = synic->msg_page;
		break;
	case HV_X64_MSR_EOM:
		*pdata = 0;
		break;
	case HV_X64_MSR_SINT0 ... HV_X64_MSR_SINT15:
		*pdata = atomic64_read(&synic->sint[msr - HV_X64_MSR_SINT0]);
		break;
	default:
		ret = 1;
		break;
	}
	return ret;
}

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static int synic_set_irq(struct kvm_vcpu_hv_synic *synic, u32 sint)
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{
	struct kvm_vcpu *vcpu = synic_to_vcpu(synic);
	struct kvm_lapic_irq irq;
	int ret, vector;

	if (sint >= ARRAY_SIZE(synic->sint))
		return -EINVAL;

	vector = synic_get_sint_vector(synic_read_sint(synic, sint));
	if (vector < 0)
		return -ENOENT;

	memset(&irq, 0, sizeof(irq));
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	irq.shorthand = APIC_DEST_SELF;
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	irq.dest_mode = APIC_DEST_PHYSICAL;
	irq.delivery_mode = APIC_DM_FIXED;
	irq.vector = vector;
	irq.level = 1;

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	ret = kvm_irq_delivery_to_apic(vcpu->kvm, vcpu->arch.apic, &irq, NULL);
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	trace_kvm_hv_synic_set_irq(vcpu->vcpu_id, sint, irq.vector, ret);
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	return ret;
}

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int kvm_hv_synic_set_irq(struct kvm *kvm, u32 vpidx, u32 sint)
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{
	struct kvm_vcpu_hv_synic *synic;

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	synic = synic_get(kvm, vpidx);
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	if (!synic)
		return -EINVAL;

	return synic_set_irq(synic, sint);
}

void kvm_hv_synic_send_eoi(struct kvm_vcpu *vcpu, int vector)
{
	struct kvm_vcpu_hv_synic *synic = vcpu_to_synic(vcpu);
	int i;

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	trace_kvm_hv_synic_send_eoi(vcpu->vcpu_id, vector);
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	for (i = 0; i < ARRAY_SIZE(synic->sint); i++)
		if (synic_get_sint_vector(synic_read_sint(synic, i)) == vector)
			kvm_hv_notify_acked_sint(vcpu, i);
}

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static int kvm_hv_set_sint_gsi(struct kvm *kvm, u32 vpidx, u32 sint, int gsi)
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{
	struct kvm_vcpu_hv_synic *synic;

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	synic = synic_get(kvm, vpidx);
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	if (!synic)
		return -EINVAL;

	if (sint >= ARRAY_SIZE(synic->sint_to_gsi))
		return -EINVAL;

	atomic_set(&synic->sint_to_gsi[sint], gsi);
	return 0;
}

void kvm_hv_irq_routing_update(struct kvm *kvm)
{
	struct kvm_irq_routing_table *irq_rt;
	struct kvm_kernel_irq_routing_entry *e;
	u32 gsi;

	irq_rt = srcu_dereference_check(kvm->irq_routing, &kvm->irq_srcu,
					lockdep_is_held(&kvm->irq_lock));

	for (gsi = 0; gsi < irq_rt->nr_rt_entries; gsi++) {
		hlist_for_each_entry(e, &irq_rt->map[gsi], link) {
			if (e->type == KVM_IRQ_ROUTING_HV_SINT)
				kvm_hv_set_sint_gsi(kvm, e->hv_sint.vcpu,
						    e->hv_sint.sint, gsi);
		}
	}
}

static void synic_init(struct kvm_vcpu_hv_synic *synic)
{
	int i;

	memset(synic, 0, sizeof(*synic));
	synic->version = HV_SYNIC_VERSION_1;
	for (i = 0; i < ARRAY_SIZE(synic->sint); i++) {
		atomic64_set(&synic->sint[i], HV_SYNIC_SINT_MASKED);
		atomic_set(&synic->sint_to_gsi[i], -1);
	}
}

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static u64 get_time_ref_counter(struct kvm *kvm)
{
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	struct kvm_hv *hv = &kvm->arch.hyperv;
	struct kvm_vcpu *vcpu;
	u64 tsc;

	/*
	 * The guest has not set up the TSC page or the clock isn't
	 * stable, fall back to get_kvmclock_ns.
	 */
	if (!hv->tsc_ref.tsc_sequence)
		return div_u64(get_kvmclock_ns(kvm), 100);

	vcpu = kvm_get_vcpu(kvm, 0);
	tsc = kvm_read_l1_tsc(vcpu, rdtsc());
	return mul_u64_u64_shr(tsc, hv->tsc_ref.tsc_scale, 64)
		+ hv->tsc_ref.tsc_offset;
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}

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static void stimer_mark_pending(struct kvm_vcpu_hv_stimer *stimer,
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				bool vcpu_kick)
{
	struct kvm_vcpu *vcpu = stimer_to_vcpu(stimer);

	set_bit(stimer->index,
		vcpu_to_hv_vcpu(vcpu)->stimer_pending_bitmap);
	kvm_make_request(KVM_REQ_HV_STIMER, vcpu);
	if (vcpu_kick)
		kvm_vcpu_kick(vcpu);
}

static void stimer_cleanup(struct kvm_vcpu_hv_stimer *stimer)
{
	struct kvm_vcpu *vcpu = stimer_to_vcpu(stimer);

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	trace_kvm_hv_stimer_cleanup(stimer_to_vcpu(stimer)->vcpu_id,
				    stimer->index);

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	hrtimer_cancel(&stimer->timer);
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	clear_bit(stimer->index,
		  vcpu_to_hv_vcpu(vcpu)->stimer_pending_bitmap);
	stimer->msg_pending = false;
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	stimer->exp_time = 0;
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}

static enum hrtimer_restart stimer_timer_callback(struct hrtimer *timer)
{
	struct kvm_vcpu_hv_stimer *stimer;

	stimer = container_of(timer, struct kvm_vcpu_hv_stimer, timer);
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	trace_kvm_hv_stimer_callback(stimer_to_vcpu(stimer)->vcpu_id,
				     stimer->index);
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	stimer_mark_pending(stimer, true);
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	return HRTIMER_NORESTART;
}

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/*
 * stimer_start() assumptions:
 * a) stimer->count is not equal to 0
 * b) stimer->config has HV_STIMER_ENABLE flag
 */
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static int stimer_start(struct kvm_vcpu_hv_stimer *stimer)
{
	u64 time_now;
	ktime_t ktime_now;

	time_now = get_time_ref_counter(stimer_to_vcpu(stimer)->kvm);
	ktime_now = ktime_get();

	if (stimer->config & HV_STIMER_PERIODIC) {
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		if (stimer->exp_time) {
			if (time_now >= stimer->exp_time) {
				u64 remainder;

				div64_u64_rem(time_now - stimer->exp_time,
					      stimer->count, &remainder);
				stimer->exp_time =
					time_now + (stimer->count - remainder);
			}
		} else
			stimer->exp_time = time_now + stimer->count;
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		trace_kvm_hv_stimer_start_periodic(
					stimer_to_vcpu(stimer)->vcpu_id,
					stimer->index,
					time_now, stimer->exp_time);

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		hrtimer_start(&stimer->timer,
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			      ktime_add_ns(ktime_now,
					   100 * (stimer->exp_time - time_now)),
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			      HRTIMER_MODE_ABS);
		return 0;
	}
	stimer->exp_time = stimer->count;
	if (time_now >= stimer->count) {
		/*
		 * Expire timer according to Hypervisor Top-Level Functional
		 * specification v4(15.3.1):
		 * "If a one shot is enabled and the specified count is in
		 * the past, it will expire immediately."
		 */
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		stimer_mark_pending(stimer, false);
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		return 0;
	}

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	trace_kvm_hv_stimer_start_one_shot(stimer_to_vcpu(stimer)->vcpu_id,
					   stimer->index,
					   time_now, stimer->count);

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	hrtimer_start(&stimer->timer,
		      ktime_add_ns(ktime_now, 100 * (stimer->count - time_now)),
		      HRTIMER_MODE_ABS);
	return 0;
}

static int stimer_set_config(struct kvm_vcpu_hv_stimer *stimer, u64 config,
			     bool host)
{
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	trace_kvm_hv_stimer_set_config(stimer_to_vcpu(stimer)->vcpu_id,
				       stimer->index, config, host);

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	stimer_cleanup(stimer);
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	if ((stimer->config & HV_STIMER_ENABLE) && HV_STIMER_SINT(config) == 0)
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		config &= ~HV_STIMER_ENABLE;
	stimer->config = config;
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	stimer_mark_pending(stimer, false);
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	return 0;
}

static int stimer_set_count(struct kvm_vcpu_hv_stimer *stimer, u64 count,
			    bool host)
{
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	trace_kvm_hv_stimer_set_count(stimer_to_vcpu(stimer)->vcpu_id,
				      stimer->index, count, host);

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	stimer_cleanup(stimer);
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	stimer->count = count;
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	if (stimer->count == 0)
		stimer->config &= ~HV_STIMER_ENABLE;
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	else if (stimer->config & HV_STIMER_AUTOENABLE)
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		stimer->config |= HV_STIMER_ENABLE;
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	stimer_mark_pending(stimer, false);
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	return 0;
}

static int stimer_get_config(struct kvm_vcpu_hv_stimer *stimer, u64 *pconfig)
{
	*pconfig = stimer->config;
	return 0;
}

static int stimer_get_count(struct kvm_vcpu_hv_stimer *stimer, u64 *pcount)
{
	*pcount = stimer->count;
	return 0;
}

static int synic_deliver_msg(struct kvm_vcpu_hv_synic *synic, u32 sint,
			     struct hv_message *src_msg)
{
	struct kvm_vcpu *vcpu = synic_to_vcpu(synic);
	struct page *page;
	gpa_t gpa;
	struct hv_message *dst_msg;
	int r;
	struct hv_message_page *msg_page;

	if (!(synic->msg_page & HV_SYNIC_SIMP_ENABLE))
		return -ENOENT;

	gpa = synic->msg_page & PAGE_MASK;
	page = kvm_vcpu_gfn_to_page(vcpu, gpa >> PAGE_SHIFT);
	if (is_error_page(page))
		return -EFAULT;

	msg_page = kmap_atomic(page);
	dst_msg = &msg_page->sint_message[sint];
	if (sync_cmpxchg(&dst_msg->header.message_type, HVMSG_NONE,
			 src_msg->header.message_type) != HVMSG_NONE) {
		dst_msg->header.message_flags.msg_pending = 1;
		r = -EAGAIN;
	} else {
		memcpy(&dst_msg->u.payload, &src_msg->u.payload,
		       src_msg->header.payload_size);
		dst_msg->header.message_type = src_msg->header.message_type;
		dst_msg->header.payload_size = src_msg->header.payload_size;
		r = synic_set_irq(synic, sint);
		if (r >= 1)
			r = 0;
		else if (r == 0)
			r = -EFAULT;
	}
	kunmap_atomic(msg_page);
	kvm_release_page_dirty(page);
	kvm_vcpu_mark_page_dirty(vcpu, gpa >> PAGE_SHIFT);
	return r;
}

603
static int stimer_send_msg(struct kvm_vcpu_hv_stimer *stimer)
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{
	struct kvm_vcpu *vcpu = stimer_to_vcpu(stimer);
	struct hv_message *msg = &stimer->msg;
	struct hv_timer_message_payload *payload =
			(struct hv_timer_message_payload *)&msg->u.payload;

	payload->expiration_time = stimer->exp_time;
	payload->delivery_time = get_time_ref_counter(vcpu->kvm);
612 613
	return synic_deliver_msg(vcpu_to_synic(vcpu),
				 HV_STIMER_SINT(stimer->config), msg);
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}

static void stimer_expiration(struct kvm_vcpu_hv_stimer *stimer)
{
618 619
	int r;

620
	stimer->msg_pending = true;
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	r = stimer_send_msg(stimer);
	trace_kvm_hv_stimer_expiration(stimer_to_vcpu(stimer)->vcpu_id,
				       stimer->index, r);
	if (!r) {
625 626 627 628
		stimer->msg_pending = false;
		if (!(stimer->config & HV_STIMER_PERIODIC))
			stimer->config &= ~HV_STIMER_ENABLE;
	}
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}

void kvm_hv_process_stimers(struct kvm_vcpu *vcpu)
{
	struct kvm_vcpu_hv *hv_vcpu = vcpu_to_hv_vcpu(vcpu);
	struct kvm_vcpu_hv_stimer *stimer;
635
	u64 time_now, exp_time;
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	int i;

	for (i = 0; i < ARRAY_SIZE(hv_vcpu->stimer); i++)
		if (test_and_clear_bit(i, hv_vcpu->stimer_pending_bitmap)) {
			stimer = &hv_vcpu->stimer[i];
			if (stimer->config & HV_STIMER_ENABLE) {
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				exp_time = stimer->exp_time;

				if (exp_time) {
					time_now =
						get_time_ref_counter(vcpu->kvm);
					if (time_now >= exp_time)
						stimer_expiration(stimer);
				}
650

651
				if ((stimer->config & HV_STIMER_ENABLE) &&
652 653 654 655
				    stimer->count) {
					if (!stimer->msg_pending)
						stimer_start(stimer);
				} else
656
					stimer_cleanup(stimer);
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			}
		}
}

void kvm_hv_vcpu_uninit(struct kvm_vcpu *vcpu)
{
	struct kvm_vcpu_hv *hv_vcpu = vcpu_to_hv_vcpu(vcpu);
	int i;

	for (i = 0; i < ARRAY_SIZE(hv_vcpu->stimer); i++)
		stimer_cleanup(&hv_vcpu->stimer[i]);
}

static void stimer_prepare_msg(struct kvm_vcpu_hv_stimer *stimer)
{
	struct hv_message *msg = &stimer->msg;
	struct hv_timer_message_payload *payload =
			(struct hv_timer_message_payload *)&msg->u.payload;

	memset(&msg->header, 0, sizeof(msg->header));
	msg->header.message_type = HVMSG_TIMER_EXPIRED;
	msg->header.payload_size = sizeof(*payload);

	payload->timer_index = stimer->index;
	payload->expiration_time = 0;
	payload->delivery_time = 0;
}

static void stimer_init(struct kvm_vcpu_hv_stimer *stimer, int timer_index)
{
	memset(stimer, 0, sizeof(*stimer));
	stimer->index = timer_index;
	hrtimer_init(&stimer->timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
	stimer->timer.function = stimer_timer_callback;
	stimer_prepare_msg(stimer);
}

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void kvm_hv_vcpu_init(struct kvm_vcpu *vcpu)
{
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	struct kvm_vcpu_hv *hv_vcpu = vcpu_to_hv_vcpu(vcpu);
	int i;

	synic_init(&hv_vcpu->synic);

	bitmap_zero(hv_vcpu->stimer_pending_bitmap, HV_SYNIC_STIMER_COUNT);
	for (i = 0; i < ARRAY_SIZE(hv_vcpu->stimer); i++)
		stimer_init(&hv_vcpu->stimer[i], i);
704 705
}

706 707 708 709 710 711 712
void kvm_hv_vcpu_postcreate(struct kvm_vcpu *vcpu)
{
	struct kvm_vcpu_hv *hv_vcpu = vcpu_to_hv_vcpu(vcpu);

	hv_vcpu->vp_index = kvm_vcpu_get_idx(vcpu);
}

713
int kvm_hv_activate_synic(struct kvm_vcpu *vcpu, bool dont_zero_synic_pages)
714
{
715 716
	struct kvm_vcpu_hv_synic *synic = vcpu_to_synic(vcpu);

717 718 719 720 721
	/*
	 * Hyper-V SynIC auto EOI SINT's are
	 * not compatible with APICV, so deactivate APICV
	 */
	kvm_vcpu_deactivate_apicv(vcpu);
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	synic->active = true;
	synic->dont_zero_synic_pages = dont_zero_synic_pages;
724 725 726
	return 0;
}

727 728 729 730 731 732 733 734 735
static bool kvm_hv_msr_partition_wide(u32 msr)
{
	bool r = false;

	switch (msr) {
	case HV_X64_MSR_GUEST_OS_ID:
	case HV_X64_MSR_HYPERCALL:
	case HV_X64_MSR_REFERENCE_TSC:
	case HV_X64_MSR_TIME_REF_COUNT:
736 737
	case HV_X64_MSR_CRASH_CTL:
	case HV_X64_MSR_CRASH_P0 ... HV_X64_MSR_CRASH_P4:
738
	case HV_X64_MSR_RESET:
739 740 741 742 743 744 745
		r = true;
		break;
	}

	return r;
}

746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800
static int kvm_hv_msr_get_crash_data(struct kvm_vcpu *vcpu,
				     u32 index, u64 *pdata)
{
	struct kvm_hv *hv = &vcpu->kvm->arch.hyperv;

	if (WARN_ON_ONCE(index >= ARRAY_SIZE(hv->hv_crash_param)))
		return -EINVAL;

	*pdata = hv->hv_crash_param[index];
	return 0;
}

static int kvm_hv_msr_get_crash_ctl(struct kvm_vcpu *vcpu, u64 *pdata)
{
	struct kvm_hv *hv = &vcpu->kvm->arch.hyperv;

	*pdata = hv->hv_crash_ctl;
	return 0;
}

static int kvm_hv_msr_set_crash_ctl(struct kvm_vcpu *vcpu, u64 data, bool host)
{
	struct kvm_hv *hv = &vcpu->kvm->arch.hyperv;

	if (host)
		hv->hv_crash_ctl = data & HV_X64_MSR_CRASH_CTL_NOTIFY;

	if (!host && (data & HV_X64_MSR_CRASH_CTL_NOTIFY)) {

		vcpu_debug(vcpu, "hv crash (0x%llx 0x%llx 0x%llx 0x%llx 0x%llx)\n",
			  hv->hv_crash_param[0],
			  hv->hv_crash_param[1],
			  hv->hv_crash_param[2],
			  hv->hv_crash_param[3],
			  hv->hv_crash_param[4]);

		/* Send notification about crash to user space */
		kvm_make_request(KVM_REQ_HV_CRASH, vcpu);
	}

	return 0;
}

static int kvm_hv_msr_set_crash_data(struct kvm_vcpu *vcpu,
				     u32 index, u64 data)
{
	struct kvm_hv *hv = &vcpu->kvm->arch.hyperv;

	if (WARN_ON_ONCE(index >= ARRAY_SIZE(hv->hv_crash_param)))
		return -EINVAL;

	hv->hv_crash_param[index] = data;
	return 0;
}

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/*
 * The kvmclock and Hyper-V TSC page use similar formulas, and converting
 * between them is possible:
 *
 * kvmclock formula:
 *    nsec = (ticks - tsc_timestamp) * tsc_to_system_mul * 2^(tsc_shift-32)
 *           + system_time
 *
 * Hyper-V formula:
 *    nsec/100 = ticks * scale / 2^64 + offset
 *
 * When tsc_timestamp = system_time = 0, offset is zero in the Hyper-V formula.
 * By dividing the kvmclock formula by 100 and equating what's left we get:
 *    ticks * scale / 2^64 = ticks * tsc_to_system_mul * 2^(tsc_shift-32) / 100
 *            scale / 2^64 =         tsc_to_system_mul * 2^(tsc_shift-32) / 100
 *            scale        =         tsc_to_system_mul * 2^(32+tsc_shift) / 100
 *
 * Now expand the kvmclock formula and divide by 100:
 *    nsec = ticks * tsc_to_system_mul * 2^(tsc_shift-32)
 *           - tsc_timestamp * tsc_to_system_mul * 2^(tsc_shift-32)
 *           + system_time
 *    nsec/100 = ticks * tsc_to_system_mul * 2^(tsc_shift-32) / 100
 *               - tsc_timestamp * tsc_to_system_mul * 2^(tsc_shift-32) / 100
 *               + system_time / 100
 *
 * Replace tsc_to_system_mul * 2^(tsc_shift-32) / 100 by scale / 2^64:
 *    nsec/100 = ticks * scale / 2^64
 *               - tsc_timestamp * scale / 2^64
 *               + system_time / 100
 *
 * Equate with the Hyper-V formula so that ticks * scale / 2^64 cancels out:
 *    offset = system_time / 100 - tsc_timestamp * scale / 2^64
 *
 * These two equivalencies are implemented in this function.
 */
static bool compute_tsc_page_parameters(struct pvclock_vcpu_time_info *hv_clock,
					HV_REFERENCE_TSC_PAGE *tsc_ref)
{
	u64 max_mul;

	if (!(hv_clock->flags & PVCLOCK_TSC_STABLE_BIT))
		return false;

	/*
	 * check if scale would overflow, if so we use the time ref counter
	 *    tsc_to_system_mul * 2^(tsc_shift+32) / 100 >= 2^64
	 *    tsc_to_system_mul / 100 >= 2^(32-tsc_shift)
	 *    tsc_to_system_mul >= 100 * 2^(32-tsc_shift)
	 */
	max_mul = 100ull << (32 - hv_clock->tsc_shift);
	if (hv_clock->tsc_to_system_mul >= max_mul)
		return false;

	/*
	 * Otherwise compute the scale and offset according to the formulas
	 * derived above.
	 */
	tsc_ref->tsc_scale =
		mul_u64_u32_div(1ULL << (32 + hv_clock->tsc_shift),
				hv_clock->tsc_to_system_mul,
				100);

	tsc_ref->tsc_offset = hv_clock->system_time;
	do_div(tsc_ref->tsc_offset, 100);
	tsc_ref->tsc_offset -=
		mul_u64_u64_shr(hv_clock->tsc_timestamp, tsc_ref->tsc_scale, 64);
	return true;
}

void kvm_hv_setup_tsc_page(struct kvm *kvm,
			   struct pvclock_vcpu_time_info *hv_clock)
{
	struct kvm_hv *hv = &kvm->arch.hyperv;
	u32 tsc_seq;
	u64 gfn;

	BUILD_BUG_ON(sizeof(tsc_seq) != sizeof(hv->tsc_ref.tsc_sequence));
	BUILD_BUG_ON(offsetof(HV_REFERENCE_TSC_PAGE, tsc_sequence) != 0);

	if (!(hv->hv_tsc_page & HV_X64_MSR_TSC_REFERENCE_ENABLE))
		return;

883 884 885 886
	mutex_lock(&kvm->arch.hyperv.hv_lock);
	if (!(hv->hv_tsc_page & HV_X64_MSR_TSC_REFERENCE_ENABLE))
		goto out_unlock;

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	gfn = hv->hv_tsc_page >> HV_X64_MSR_TSC_REFERENCE_ADDRESS_SHIFT;
	/*
	 * Because the TSC parameters only vary when there is a
	 * change in the master clock, do not bother with caching.
	 */
	if (unlikely(kvm_read_guest(kvm, gfn_to_gpa(gfn),
				    &tsc_seq, sizeof(tsc_seq))))
894
		goto out_unlock;
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	/*
	 * While we're computing and writing the parameters, force the
	 * guest to use the time reference count MSR.
	 */
	hv->tsc_ref.tsc_sequence = 0;
	if (kvm_write_guest(kvm, gfn_to_gpa(gfn),
			    &hv->tsc_ref, sizeof(hv->tsc_ref.tsc_sequence)))
903
		goto out_unlock;
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	if (!compute_tsc_page_parameters(hv_clock, &hv->tsc_ref))
906
		goto out_unlock;
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	/* Ensure sequence is zero before writing the rest of the struct.  */
	smp_wmb();
	if (kvm_write_guest(kvm, gfn_to_gpa(gfn), &hv->tsc_ref, sizeof(hv->tsc_ref)))
911
		goto out_unlock;
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	/*
	 * Now switch to the TSC page mechanism by writing the sequence.
	 */
	tsc_seq++;
	if (tsc_seq == 0xFFFFFFFF || tsc_seq == 0)
		tsc_seq = 1;

	/* Write the struct entirely before the non-zero sequence.  */
	smp_wmb();

	hv->tsc_ref.tsc_sequence = tsc_seq;
	kvm_write_guest(kvm, gfn_to_gpa(gfn),
			&hv->tsc_ref, sizeof(hv->tsc_ref.tsc_sequence));
926 927
out_unlock:
	mutex_unlock(&kvm->arch.hyperv.hv_lock);
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}

930 931
static int kvm_hv_set_msr_pw(struct kvm_vcpu *vcpu, u32 msr, u64 data,
			     bool host)
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{
	struct kvm *kvm = vcpu->kvm;
	struct kvm_hv *hv = &kvm->arch.hyperv;

	switch (msr) {
	case HV_X64_MSR_GUEST_OS_ID:
		hv->hv_guest_os_id = data;
		/* setting guest os id to zero disables hypercall page */
		if (!hv->hv_guest_os_id)
			hv->hv_hypercall &= ~HV_X64_MSR_HYPERCALL_ENABLE;
		break;
	case HV_X64_MSR_HYPERCALL: {
		u64 gfn;
		unsigned long addr;
		u8 instructions[4];

		/* if guest os id is not set hypercall should remain disabled */
		if (!hv->hv_guest_os_id)
			break;
		if (!(data & HV_X64_MSR_HYPERCALL_ENABLE)) {
			hv->hv_hypercall = data;
			break;
		}
		gfn = data >> HV_X64_MSR_HYPERCALL_PAGE_ADDRESS_SHIFT;
		addr = gfn_to_hva(kvm, gfn);
		if (kvm_is_error_hva(addr))
			return 1;
		kvm_x86_ops->patch_hypercall(vcpu, instructions);
		((unsigned char *)instructions)[3] = 0xc3; /* ret */
		if (__copy_to_user((void __user *)addr, instructions, 4))
			return 1;
		hv->hv_hypercall = data;
		mark_page_dirty(kvm, gfn);
		break;
	}
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	case HV_X64_MSR_REFERENCE_TSC:
968
		hv->hv_tsc_page = data;
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		if (hv->hv_tsc_page & HV_X64_MSR_TSC_REFERENCE_ENABLE)
			kvm_make_request(KVM_REQ_MASTERCLOCK_UPDATE, vcpu);
971
		break;
972 973 974 975 976 977
	case HV_X64_MSR_CRASH_P0 ... HV_X64_MSR_CRASH_P4:
		return kvm_hv_msr_set_crash_data(vcpu,
						 msr - HV_X64_MSR_CRASH_P0,
						 data);
	case HV_X64_MSR_CRASH_CTL:
		return kvm_hv_msr_set_crash_ctl(vcpu, data, host);
978 979 980 981 982 983
	case HV_X64_MSR_RESET:
		if (data == 1) {
			vcpu_debug(vcpu, "hyper-v reset requested\n");
			kvm_make_request(KVM_REQ_HV_RESET, vcpu);
		}
		break;
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	default:
		vcpu_unimpl(vcpu, "Hyper-V uhandled wrmsr: 0x%x data 0x%llx\n",
			    msr, data);
		return 1;
	}
	return 0;
}

992 993 994
/* Calculate cpu time spent by current task in 100ns units */
static u64 current_task_runtime_100ns(void)
{
995
	u64 utime, stime;
996 997

	task_cputime_adjusted(current, &utime, &stime);
998 999

	return div_u64(utime + stime, 100);
1000 1001 1002
}

static int kvm_hv_set_msr(struct kvm_vcpu *vcpu, u32 msr, u64 data, bool host)
1003 1004 1005 1006
{
	struct kvm_vcpu_hv *hv = &vcpu->arch.hyperv;

	switch (msr) {
1007 1008 1009 1010 1011
	case HV_X64_MSR_VP_INDEX:
		if (!host)
			return 1;
		hv->vp_index = (u32)data;
		break;
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	case HV_X64_MSR_APIC_ASSIST_PAGE: {
		u64 gfn;
		unsigned long addr;

		if (!(data & HV_X64_MSR_APIC_ASSIST_PAGE_ENABLE)) {
			hv->hv_vapic = data;
			if (kvm_lapic_enable_pv_eoi(vcpu, 0))
				return 1;
			break;
		}
		gfn = data >> HV_X64_MSR_APIC_ASSIST_PAGE_ADDRESS_SHIFT;
		addr = kvm_vcpu_gfn_to_hva(vcpu, gfn);
		if (kvm_is_error_hva(addr))
			return 1;
		if (__clear_user((void __user *)addr, PAGE_SIZE))
			return 1;
		hv->hv_vapic = data;
		kvm_vcpu_mark_page_dirty(vcpu, gfn);
		if (kvm_lapic_enable_pv_eoi(vcpu,
					    gfn_to_gpa(gfn) | KVM_MSR_ENABLED))
			return 1;
		break;
	}
	case HV_X64_MSR_EOI:
		return kvm_hv_vapic_msr_write(vcpu, APIC_EOI, data);
	case HV_X64_MSR_ICR:
		return kvm_hv_vapic_msr_write(vcpu, APIC_ICR, data);
	case HV_X64_MSR_TPR:
		return kvm_hv_vapic_msr_write(vcpu, APIC_TASKPRI, data);
1041 1042 1043 1044 1045
	case HV_X64_MSR_VP_RUNTIME:
		if (!host)
			return 1;
		hv->runtime_offset = data - current_task_runtime_100ns();
		break;
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	case HV_X64_MSR_SCONTROL:
	case HV_X64_MSR_SVERSION:
	case HV_X64_MSR_SIEFP:
	case HV_X64_MSR_SIMP:
	case HV_X64_MSR_EOM:
	case HV_X64_MSR_SINT0 ... HV_X64_MSR_SINT15:
		return synic_set_msr(vcpu_to_synic(vcpu), msr, data, host);
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	case HV_X64_MSR_STIMER0_CONFIG:
	case HV_X64_MSR_STIMER1_CONFIG:
	case HV_X64_MSR_STIMER2_CONFIG:
	case HV_X64_MSR_STIMER3_CONFIG: {
		int timer_index = (msr - HV_X64_MSR_STIMER0_CONFIG)/2;

		return stimer_set_config(vcpu_to_stimer(vcpu, timer_index),
					 data, host);
	}
	case HV_X64_MSR_STIMER0_COUNT:
	case HV_X64_MSR_STIMER1_COUNT:
	case HV_X64_MSR_STIMER2_COUNT:
	case HV_X64_MSR_STIMER3_COUNT: {
		int timer_index = (msr - HV_X64_MSR_STIMER0_COUNT)/2;

		return stimer_set_count(vcpu_to_stimer(vcpu, timer_index),
					data, host);
	}
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	default:
		vcpu_unimpl(vcpu, "Hyper-V uhandled wrmsr: 0x%x data 0x%llx\n",
			    msr, data);
		return 1;
	}

	return 0;
}

static int kvm_hv_get_msr_pw(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
{
	u64 data = 0;
	struct kvm *kvm = vcpu->kvm;
	struct kvm_hv *hv = &kvm->arch.hyperv;

	switch (msr) {
	case HV_X64_MSR_GUEST_OS_ID:
		data = hv->hv_guest_os_id;
		break;
	case HV_X64_MSR_HYPERCALL:
		data = hv->hv_hypercall;
		break;
1093 1094
	case HV_X64_MSR_TIME_REF_COUNT:
		data = get_time_ref_counter(kvm);
1095 1096 1097 1098
		break;
	case HV_X64_MSR_REFERENCE_TSC:
		data = hv->hv_tsc_page;
		break;
1099 1100 1101 1102 1103 1104
	case HV_X64_MSR_CRASH_P0 ... HV_X64_MSR_CRASH_P4:
		return kvm_hv_msr_get_crash_data(vcpu,
						 msr - HV_X64_MSR_CRASH_P0,
						 pdata);
	case HV_X64_MSR_CRASH_CTL:
		return kvm_hv_msr_get_crash_ctl(vcpu, pdata);
1105 1106 1107
	case HV_X64_MSR_RESET:
		data = 0;
		break;
1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122
	default:
		vcpu_unimpl(vcpu, "Hyper-V unhandled rdmsr: 0x%x\n", msr);
		return 1;
	}

	*pdata = data;
	return 0;
}

static int kvm_hv_get_msr(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
{
	u64 data = 0;
	struct kvm_vcpu_hv *hv = &vcpu->arch.hyperv;

	switch (msr) {
1123 1124
	case HV_X64_MSR_VP_INDEX:
		data = hv->vp_index;
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		break;
	case HV_X64_MSR_EOI:
		return kvm_hv_vapic_msr_read(vcpu, APIC_EOI, pdata);
	case HV_X64_MSR_ICR:
		return kvm_hv_vapic_msr_read(vcpu, APIC_ICR, pdata);
	case HV_X64_MSR_TPR:
		return kvm_hv_vapic_msr_read(vcpu, APIC_TASKPRI, pdata);
	case HV_X64_MSR_APIC_ASSIST_PAGE:
		data = hv->hv_vapic;
		break;
1135 1136 1137
	case HV_X64_MSR_VP_RUNTIME:
		data = current_task_runtime_100ns() + hv->runtime_offset;
		break;
1138 1139 1140 1141 1142 1143 1144
	case HV_X64_MSR_SCONTROL:
	case HV_X64_MSR_SVERSION:
	case HV_X64_MSR_SIEFP:
	case HV_X64_MSR_SIMP:
	case HV_X64_MSR_EOM:
	case HV_X64_MSR_SINT0 ... HV_X64_MSR_SINT15:
		return synic_get_msr(vcpu_to_synic(vcpu), msr, pdata);
A
Andrey Smetanin 已提交
1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162
	case HV_X64_MSR_STIMER0_CONFIG:
	case HV_X64_MSR_STIMER1_CONFIG:
	case HV_X64_MSR_STIMER2_CONFIG:
	case HV_X64_MSR_STIMER3_CONFIG: {
		int timer_index = (msr - HV_X64_MSR_STIMER0_CONFIG)/2;

		return stimer_get_config(vcpu_to_stimer(vcpu, timer_index),
					 pdata);
	}
	case HV_X64_MSR_STIMER0_COUNT:
	case HV_X64_MSR_STIMER1_COUNT:
	case HV_X64_MSR_STIMER2_COUNT:
	case HV_X64_MSR_STIMER3_COUNT: {
		int timer_index = (msr - HV_X64_MSR_STIMER0_COUNT)/2;

		return stimer_get_count(vcpu_to_stimer(vcpu, timer_index),
					pdata);
	}
1163 1164 1165 1166 1167 1168 1169 1170
	default:
		vcpu_unimpl(vcpu, "Hyper-V unhandled rdmsr: 0x%x\n", msr);
		return 1;
	}
	*pdata = data;
	return 0;
}

1171
int kvm_hv_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data, bool host)
1172 1173 1174 1175
{
	if (kvm_hv_msr_partition_wide(msr)) {
		int r;

1176
		mutex_lock(&vcpu->kvm->arch.hyperv.hv_lock);
1177
		r = kvm_hv_set_msr_pw(vcpu, msr, data, host);
1178
		mutex_unlock(&vcpu->kvm->arch.hyperv.hv_lock);
1179 1180
		return r;
	} else
1181
		return kvm_hv_set_msr(vcpu, msr, data, host);
1182 1183 1184 1185 1186 1187 1188
}

int kvm_hv_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
{
	if (kvm_hv_msr_partition_wide(msr)) {
		int r;

1189
		mutex_lock(&vcpu->kvm->arch.hyperv.hv_lock);
1190
		r = kvm_hv_get_msr_pw(vcpu, msr, pdata);
1191
		mutex_unlock(&vcpu->kvm->arch.hyperv.hv_lock);
1192 1193 1194 1195 1196 1197 1198
		return r;
	} else
		return kvm_hv_get_msr(vcpu, msr, pdata);
}

bool kvm_hv_hypercall_enabled(struct kvm *kvm)
{
1199
	return READ_ONCE(kvm->arch.hyperv.hv_hypercall) & HV_X64_MSR_HYPERCALL_ENABLE;
1200 1201
}

1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222
static void kvm_hv_hypercall_set_result(struct kvm_vcpu *vcpu, u64 result)
{
	bool longmode;

	longmode = is_64_bit_mode(vcpu);
	if (longmode)
		kvm_register_write(vcpu, VCPU_REGS_RAX, result);
	else {
		kvm_register_write(vcpu, VCPU_REGS_RDX, result >> 32);
		kvm_register_write(vcpu, VCPU_REGS_RAX, result & 0xffffffff);
	}
}

static int kvm_hv_hypercall_complete_userspace(struct kvm_vcpu *vcpu)
{
	struct kvm_run *run = vcpu->run;

	kvm_hv_hypercall_set_result(vcpu, run->hyperv.u.hcall.result);
	return 1;
}

1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234
int kvm_hv_hypercall(struct kvm_vcpu *vcpu)
{
	u64 param, ingpa, outgpa, ret;
	uint16_t code, rep_idx, rep_cnt, res = HV_STATUS_SUCCESS, rep_done = 0;
	bool fast, longmode;

	/*
	 * hypercall generates UD from non zero cpl and real mode
	 * per HYPER-V spec
	 */
	if (kvm_x86_ops->get_cpl(vcpu) != 0 || !is_protmode(vcpu)) {
		kvm_queue_exception(vcpu, UD_VECTOR);
1235
		return 1;
1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262
	}

	longmode = is_64_bit_mode(vcpu);

	if (!longmode) {
		param = ((u64)kvm_register_read(vcpu, VCPU_REGS_RDX) << 32) |
			(kvm_register_read(vcpu, VCPU_REGS_RAX) & 0xffffffff);
		ingpa = ((u64)kvm_register_read(vcpu, VCPU_REGS_RBX) << 32) |
			(kvm_register_read(vcpu, VCPU_REGS_RCX) & 0xffffffff);
		outgpa = ((u64)kvm_register_read(vcpu, VCPU_REGS_RDI) << 32) |
			(kvm_register_read(vcpu, VCPU_REGS_RSI) & 0xffffffff);
	}
#ifdef CONFIG_X86_64
	else {
		param = kvm_register_read(vcpu, VCPU_REGS_RCX);
		ingpa = kvm_register_read(vcpu, VCPU_REGS_RDX);
		outgpa = kvm_register_read(vcpu, VCPU_REGS_R8);
	}
#endif

	code = param & 0xffff;
	fast = (param >> 16) & 0x1;
	rep_cnt = (param >> 32) & 0xfff;
	rep_idx = (param >> 48) & 0xfff;

	trace_kvm_hv_hypercall(code, fast, rep_cnt, rep_idx, ingpa, outgpa);

1263 1264 1265 1266 1267 1268
	/* Hypercall continuation is not supported yet */
	if (rep_cnt || rep_idx) {
		res = HV_STATUS_INVALID_HYPERCALL_CODE;
		goto set_result;
	}

1269
	switch (code) {
1270
	case HVCALL_NOTIFY_LONG_SPIN_WAIT:
1271 1272
		kvm_vcpu_on_spin(vcpu);
		break;
1273 1274
	case HVCALL_POST_MESSAGE:
	case HVCALL_SIGNAL_EVENT:
1275 1276 1277 1278 1279
		/* don't bother userspace if it has no way to handle it */
		if (!vcpu_to_synic(vcpu)->active) {
			res = HV_STATUS_INVALID_HYPERCALL_CODE;
			break;
		}
1280 1281 1282 1283 1284 1285 1286 1287
		vcpu->run->exit_reason = KVM_EXIT_HYPERV;
		vcpu->run->hyperv.type = KVM_EXIT_HYPERV_HCALL;
		vcpu->run->hyperv.u.hcall.input = param;
		vcpu->run->hyperv.u.hcall.params[0] = ingpa;
		vcpu->run->hyperv.u.hcall.params[1] = outgpa;
		vcpu->arch.complete_userspace_io =
				kvm_hv_hypercall_complete_userspace;
		return 0;
1288 1289 1290 1291 1292
	default:
		res = HV_STATUS_INVALID_HYPERCALL_CODE;
		break;
	}

1293
set_result:
1294
	ret = res | (((u64)rep_done & 0xfff) << 32);
1295
	kvm_hv_hypercall_set_result(vcpu, ret);
1296 1297
	return 1;
}