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hyperv.c
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hyperv.c
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// SPDX-License-Identifier: GPL-2.0-only
/*
* 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>
*/
#include "x86.h"
#include "lapic.h"
#include "ioapic.h"
#include "cpuid.h"
#include "hyperv.h"
#include <linux/cpu.h>
#include <linux/kvm_host.h>
#include <linux/highmem.h>
#include <linux/sched/cputime.h>
#include <linux/eventfd.h>
#include <asm/apicdef.h>
#include <trace/events/kvm.h>
#include "trace.h"
#include "irq.h"
#define KVM_HV_MAX_SPARSE_VCPU_SET_BITS DIV_ROUND_UP(KVM_MAX_VCPUS, 64)
static void stimer_mark_pending(struct kvm_vcpu_hv_stimer *stimer,
bool vcpu_kick);
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;
}
static void synic_update_vector(struct kvm_vcpu_hv_synic *synic,
int vector)
{
if (vector < HV_SYNIC_FIRST_VALID_VECTOR)
return;
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);
}
static int synic_set_sint(struct kvm_vcpu_hv_synic *synic, int sint,
u64 data, bool host)
{
int vector, old_vector;
bool masked;
vector = data & HV_SYNIC_SINT_VECTOR_MASK;
masked = data & HV_SYNIC_SINT_MASKED;
/*
* Valid vectors are 16-255, however, nested Hyper-V attempts to write
* default '0x10000' value on boot and this should not #GP. We need to
* allow zero-initing the register from host as well.
*/
if (vector < HV_SYNIC_FIRST_VALID_VECTOR && !host && !masked)
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.
*/
old_vector = synic_read_sint(synic, sint) & HV_SYNIC_SINT_VECTOR_MASK;
atomic64_set(&synic->sint[sint], data);
synic_update_vector(synic, old_vector);
synic_update_vector(synic, vector);
/* Load SynIC vectors into EOI exit bitmap */
kvm_make_request(KVM_REQ_SCAN_IOAPIC, synic_to_vcpu(synic));
return 0;
}
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)
return NULL;
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)
{
struct kvm_vcpu *vcpu;
struct kvm_vcpu_hv_synic *synic;
vcpu = get_vcpu_by_vpidx(kvm, vpidx);
if (!vcpu)
return NULL;
synic = vcpu_to_synic(vcpu);
return (synic->active) ? synic : NULL;
}
static void kvm_hv_notify_acked_sint(struct kvm_vcpu *vcpu, u32 sint)
{
struct kvm *kvm = vcpu->kvm;
struct kvm_vcpu_hv_synic *synic = vcpu_to_synic(vcpu);
struct kvm_vcpu_hv *hv_vcpu = vcpu_to_hv_vcpu(vcpu);
struct kvm_vcpu_hv_stimer *stimer;
int gsi, idx;
trace_kvm_hv_notify_acked_sint(vcpu->vcpu_id, sint);
/* Try to deliver pending Hyper-V SynIC timers messages */
for (idx = 0; idx < ARRAY_SIZE(hv_vcpu->stimer); idx++) {
stimer = &hv_vcpu->stimer[idx];
if (stimer->msg_pending && stimer->config.enable &&
!stimer->config.direct_mode &&
stimer->config.sintx == sint)
stimer_mark_pending(stimer, false);
}
idx = srcu_read_lock(&kvm->irq_srcu);
gsi = atomic_read(&synic->sint_to_gsi[sint]);
if (gsi != -1)
kvm_notify_acked_gsi(kvm, gsi);
srcu_read_unlock(&kvm->irq_srcu, idx);
}
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);
}
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 && !host)
return 1;
trace_kvm_hv_synic_set_msr(vcpu->vcpu_id, msr, data, host);
ret = 0;
switch (msr) {
case HV_X64_MSR_SCONTROL:
synic->control = data;
if (!host)
synic_exit(synic, msr);
break;
case HV_X64_MSR_SVERSION:
if (!host) {
ret = 1;
break;
}
synic->version = data;
break;
case HV_X64_MSR_SIEFP:
if ((data & HV_SYNIC_SIEFP_ENABLE) && !host &&
!synic->dont_zero_synic_pages)
if (kvm_clear_guest(vcpu->kvm,
data & PAGE_MASK, PAGE_SIZE)) {
ret = 1;
break;
}
synic->evt_page = data;
if (!host)
synic_exit(synic, msr);
break;
case HV_X64_MSR_SIMP:
if ((data & HV_SYNIC_SIMP_ENABLE) && !host &&
!synic->dont_zero_synic_pages)
if (kvm_clear_guest(vcpu->kvm,
data & PAGE_MASK, PAGE_SIZE)) {
ret = 1;
break;
}
synic->msg_page = data;
if (!host)
synic_exit(synic, msr);
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:
ret = synic_set_sint(synic, msr - HV_X64_MSR_SINT0, data, host);
break;
default:
ret = 1;
break;
}
return ret;
}
static bool kvm_hv_is_syndbg_enabled(struct kvm_vcpu *vcpu)
{
struct kvm_cpuid_entry2 *entry;
entry = kvm_find_cpuid_entry(vcpu,
HYPERV_CPUID_SYNDBG_PLATFORM_CAPABILITIES,
0);
if (!entry)
return false;
return entry->eax & HV_X64_SYNDBG_CAP_ALLOW_KERNEL_DEBUGGING;
}
static int kvm_hv_syndbg_complete_userspace(struct kvm_vcpu *vcpu)
{
struct kvm *kvm = vcpu->kvm;
struct kvm_hv *hv = &kvm->arch.hyperv;
if (vcpu->run->hyperv.u.syndbg.msr == HV_X64_MSR_SYNDBG_CONTROL)
hv->hv_syndbg.control.status =
vcpu->run->hyperv.u.syndbg.status;
return 1;
}
static void syndbg_exit(struct kvm_vcpu *vcpu, u32 msr)
{
struct kvm_hv_syndbg *syndbg = vcpu_to_hv_syndbg(vcpu);
struct kvm_vcpu_hv *hv_vcpu = &vcpu->arch.hyperv;
hv_vcpu->exit.type = KVM_EXIT_HYPERV_SYNDBG;
hv_vcpu->exit.u.syndbg.msr = msr;
hv_vcpu->exit.u.syndbg.control = syndbg->control.control;
hv_vcpu->exit.u.syndbg.send_page = syndbg->control.send_page;
hv_vcpu->exit.u.syndbg.recv_page = syndbg->control.recv_page;
hv_vcpu->exit.u.syndbg.pending_page = syndbg->control.pending_page;
vcpu->arch.complete_userspace_io =
kvm_hv_syndbg_complete_userspace;
kvm_make_request(KVM_REQ_HV_EXIT, vcpu);
}
static int syndbg_set_msr(struct kvm_vcpu *vcpu, u32 msr, u64 data, bool host)
{
struct kvm_hv_syndbg *syndbg = vcpu_to_hv_syndbg(vcpu);
if (!kvm_hv_is_syndbg_enabled(vcpu) && !host)
return 1;
trace_kvm_hv_syndbg_set_msr(vcpu->vcpu_id,
vcpu_to_hv_vcpu(vcpu)->vp_index, msr, data);
switch (msr) {
case HV_X64_MSR_SYNDBG_CONTROL:
syndbg->control.control = data;
if (!host)
syndbg_exit(vcpu, msr);
break;
case HV_X64_MSR_SYNDBG_STATUS:
syndbg->control.status = data;
break;
case HV_X64_MSR_SYNDBG_SEND_BUFFER:
syndbg->control.send_page = data;
break;
case HV_X64_MSR_SYNDBG_RECV_BUFFER:
syndbg->control.recv_page = data;
break;
case HV_X64_MSR_SYNDBG_PENDING_BUFFER:
syndbg->control.pending_page = data;
if (!host)
syndbg_exit(vcpu, msr);
break;
case HV_X64_MSR_SYNDBG_OPTIONS:
syndbg->options = data;
break;
default:
break;
}
return 0;
}
static int syndbg_get_msr(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata, bool host)
{
struct kvm_hv_syndbg *syndbg = vcpu_to_hv_syndbg(vcpu);
if (!kvm_hv_is_syndbg_enabled(vcpu) && !host)
return 1;
switch (msr) {
case HV_X64_MSR_SYNDBG_CONTROL:
*pdata = syndbg->control.control;
break;
case HV_X64_MSR_SYNDBG_STATUS:
*pdata = syndbg->control.status;
break;
case HV_X64_MSR_SYNDBG_SEND_BUFFER:
*pdata = syndbg->control.send_page;
break;
case HV_X64_MSR_SYNDBG_RECV_BUFFER:
*pdata = syndbg->control.recv_page;
break;
case HV_X64_MSR_SYNDBG_PENDING_BUFFER:
*pdata = syndbg->control.pending_page;
break;
case HV_X64_MSR_SYNDBG_OPTIONS:
*pdata = syndbg->options;
break;
default:
break;
}
trace_kvm_hv_syndbg_get_msr(vcpu->vcpu_id,
vcpu_to_hv_vcpu(vcpu)->vp_index, msr,
*pdata);
return 0;
}
static int synic_get_msr(struct kvm_vcpu_hv_synic *synic, u32 msr, u64 *pdata,
bool host)
{
int ret;
if (!synic->active && !host)
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;
}
static int synic_set_irq(struct kvm_vcpu_hv_synic *synic, u32 sint)
{
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));
irq.shorthand = APIC_DEST_SELF;
irq.dest_mode = APIC_DEST_PHYSICAL;
irq.delivery_mode = APIC_DM_FIXED;
irq.vector = vector;
irq.level = 1;
ret = kvm_irq_delivery_to_apic(vcpu->kvm, vcpu->arch.apic, &irq, NULL);
trace_kvm_hv_synic_set_irq(vcpu->vcpu_id, sint, irq.vector, ret);
return ret;
}
int kvm_hv_synic_set_irq(struct kvm *kvm, u32 vpidx, u32 sint)
{
struct kvm_vcpu_hv_synic *synic;
synic = synic_get(kvm, vpidx);
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;
trace_kvm_hv_synic_send_eoi(vcpu->vcpu_id, vector);
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);
}
static int kvm_hv_set_sint_gsi(struct kvm *kvm, u32 vpidx, u32 sint, int gsi)
{
struct kvm_vcpu_hv_synic *synic;
synic = synic_get(kvm, vpidx);
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);
}
}
static u64 get_time_ref_counter(struct kvm *kvm)
{
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;
}
static void stimer_mark_pending(struct kvm_vcpu_hv_stimer *stimer,
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);
trace_kvm_hv_stimer_cleanup(stimer_to_vcpu(stimer)->vcpu_id,
stimer->index);
hrtimer_cancel(&stimer->timer);
clear_bit(stimer->index,
vcpu_to_hv_vcpu(vcpu)->stimer_pending_bitmap);
stimer->msg_pending = false;
stimer->exp_time = 0;
}
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);
trace_kvm_hv_stimer_callback(stimer_to_vcpu(stimer)->vcpu_id,
stimer->index);
stimer_mark_pending(stimer, true);
return HRTIMER_NORESTART;
}
/*
* stimer_start() assumptions:
* a) stimer->count is not equal to 0
* b) stimer->config has HV_STIMER_ENABLE flag
*/
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.periodic) {
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;
trace_kvm_hv_stimer_start_periodic(
stimer_to_vcpu(stimer)->vcpu_id,
stimer->index,
time_now, stimer->exp_time);
hrtimer_start(&stimer->timer,
ktime_add_ns(ktime_now,
100 * (stimer->exp_time - time_now)),
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."
*/
stimer_mark_pending(stimer, false);
return 0;
}
trace_kvm_hv_stimer_start_one_shot(stimer_to_vcpu(stimer)->vcpu_id,
stimer->index,
time_now, stimer->count);
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)
{
union hv_stimer_config new_config = {.as_uint64 = config},
old_config = {.as_uint64 = stimer->config.as_uint64};
struct kvm_vcpu *vcpu = stimer_to_vcpu(stimer);
struct kvm_vcpu_hv_synic *synic = vcpu_to_synic(vcpu);
if (!synic->active && !host)
return 1;
trace_kvm_hv_stimer_set_config(stimer_to_vcpu(stimer)->vcpu_id,
stimer->index, config, host);
stimer_cleanup(stimer);
if (old_config.enable &&
!new_config.direct_mode && new_config.sintx == 0)
new_config.enable = 0;
stimer->config.as_uint64 = new_config.as_uint64;
if (stimer->config.enable)
stimer_mark_pending(stimer, false);
return 0;
}
static int stimer_set_count(struct kvm_vcpu_hv_stimer *stimer, u64 count,
bool host)
{
struct kvm_vcpu *vcpu = stimer_to_vcpu(stimer);
struct kvm_vcpu_hv_synic *synic = vcpu_to_synic(vcpu);
if (!synic->active && !host)
return 1;
trace_kvm_hv_stimer_set_count(stimer_to_vcpu(stimer)->vcpu_id,
stimer->index, count, host);
stimer_cleanup(stimer);
stimer->count = count;
if (stimer->count == 0)
stimer->config.enable = 0;
else if (stimer->config.auto_enable)
stimer->config.enable = 1;
if (stimer->config.enable)
stimer_mark_pending(stimer, false);
return 0;
}
static int stimer_get_config(struct kvm_vcpu_hv_stimer *stimer, u64 *pconfig)
{
*pconfig = stimer->config.as_uint64;
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, bool no_retry)
{
struct kvm_vcpu *vcpu = synic_to_vcpu(synic);
int msg_off = offsetof(struct hv_message_page, sint_message[sint]);
gfn_t msg_page_gfn;
struct hv_message_header hv_hdr;
int r;
if (!(synic->msg_page & HV_SYNIC_SIMP_ENABLE))
return -ENOENT;
msg_page_gfn = synic->msg_page >> PAGE_SHIFT;
/*
* Strictly following the spec-mandated ordering would assume setting
* .msg_pending before checking .message_type. However, this function
* is only called in vcpu context so the entire update is atomic from
* guest POV and thus the exact order here doesn't matter.
*/
r = kvm_vcpu_read_guest_page(vcpu, msg_page_gfn, &hv_hdr.message_type,
msg_off + offsetof(struct hv_message,
header.message_type),
sizeof(hv_hdr.message_type));
if (r < 0)
return r;
if (hv_hdr.message_type != HVMSG_NONE) {
if (no_retry)
return 0;
hv_hdr.message_flags.msg_pending = 1;
r = kvm_vcpu_write_guest_page(vcpu, msg_page_gfn,
&hv_hdr.message_flags,
msg_off +
offsetof(struct hv_message,
header.message_flags),
sizeof(hv_hdr.message_flags));
if (r < 0)
return r;
return -EAGAIN;
}
r = kvm_vcpu_write_guest_page(vcpu, msg_page_gfn, src_msg, msg_off,
sizeof(src_msg->header) +
src_msg->header.payload_size);
if (r < 0)
return r;
r = synic_set_irq(synic, sint);
if (r < 0)
return r;
if (r == 0)
return -EFAULT;
return 0;
}
static int stimer_send_msg(struct kvm_vcpu_hv_stimer *stimer)
{
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;
/*
* To avoid piling up periodic ticks, don't retry message
* delivery for them (within "lazy" lost ticks policy).
*/
bool no_retry = stimer->config.periodic;
payload->expiration_time = stimer->exp_time;
payload->delivery_time = get_time_ref_counter(vcpu->kvm);
return synic_deliver_msg(vcpu_to_synic(vcpu),
stimer->config.sintx, msg,
no_retry);
}
static int stimer_notify_direct(struct kvm_vcpu_hv_stimer *stimer)
{
struct kvm_vcpu *vcpu = stimer_to_vcpu(stimer);
struct kvm_lapic_irq irq = {
.delivery_mode = APIC_DM_FIXED,
.vector = stimer->config.apic_vector
};
if (lapic_in_kernel(vcpu))
return !kvm_apic_set_irq(vcpu, &irq, NULL);
return 0;
}
static void stimer_expiration(struct kvm_vcpu_hv_stimer *stimer)
{
int r, direct = stimer->config.direct_mode;
stimer->msg_pending = true;
if (!direct)
r = stimer_send_msg(stimer);
else
r = stimer_notify_direct(stimer);
trace_kvm_hv_stimer_expiration(stimer_to_vcpu(stimer)->vcpu_id,
stimer->index, direct, r);
if (!r) {
stimer->msg_pending = false;
if (!(stimer->config.periodic))
stimer->config.enable = 0;
}
}
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;
u64 time_now, exp_time;
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.enable) {
exp_time = stimer->exp_time;
if (exp_time) {
time_now =
get_time_ref_counter(vcpu->kvm);
if (time_now >= exp_time)
stimer_expiration(stimer);
}
if ((stimer->config.enable) &&
stimer->count) {
if (!stimer->msg_pending)
stimer_start(stimer);
} else
stimer_cleanup(stimer);
}
}
}
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]);
}
bool kvm_hv_assist_page_enabled(struct kvm_vcpu *vcpu)
{
if (!(vcpu->arch.hyperv.hv_vapic & HV_X64_MSR_VP_ASSIST_PAGE_ENABLE))
return false;
return vcpu->arch.pv_eoi.msr_val & KVM_MSR_ENABLED;
}
EXPORT_SYMBOL_GPL(kvm_hv_assist_page_enabled);
bool kvm_hv_get_assist_page(struct kvm_vcpu *vcpu,
struct hv_vp_assist_page *assist_page)
{
if (!kvm_hv_assist_page_enabled(vcpu))
return false;
return !kvm_read_guest_cached(vcpu->kvm, &vcpu->arch.pv_eoi.data,
assist_page, sizeof(*assist_page));
}
EXPORT_SYMBOL_GPL(kvm_hv_get_assist_page);
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);
}
void kvm_hv_vcpu_init(struct kvm_vcpu *vcpu)
{
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);
}
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);
}
int kvm_hv_activate_synic(struct kvm_vcpu *vcpu, bool dont_zero_synic_pages)
{
struct kvm_vcpu_hv_synic *synic = vcpu_to_synic(vcpu);
/*
* Hyper-V SynIC auto EOI SINT's are
* not compatible with APICV, so request
* to deactivate APICV permanently.
*/
kvm_request_apicv_update(vcpu->kvm, false, APICV_INHIBIT_REASON_HYPERV);
synic->active = true;
synic->dont_zero_synic_pages = dont_zero_synic_pages;
synic->control = HV_SYNIC_CONTROL_ENABLE;
return 0;
}
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:
case HV_X64_MSR_CRASH_CTL:
case HV_X64_MSR_CRASH_P0 ... HV_X64_MSR_CRASH_P4:
case HV_X64_MSR_RESET:
case HV_X64_MSR_REENLIGHTENMENT_CONTROL:
case HV_X64_MSR_TSC_EMULATION_CONTROL:
case HV_X64_MSR_TSC_EMULATION_STATUS:
case HV_X64_MSR_SYNDBG_OPTIONS:
case HV_X64_MSR_SYNDBG_CONTROL ... HV_X64_MSR_SYNDBG_PENDING_BUFFER:
r = true;
break;
}
return r;
}
static int kvm_hv_msr_get_crash_data(struct kvm_vcpu *vcpu,
u32 index, u64 *pdata)
{
struct kvm_hv *hv = &vcpu->kvm->arch.hyperv;
size_t size = ARRAY_SIZE(hv->hv_crash_param);
if (WARN_ON_ONCE(index >= size))
return -EINVAL;
*pdata = hv->hv_crash_param[array_index_nospec(index, size)];
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_CRASH_CTL_CRASH_NOTIFY;
if (!host && (data & HV_CRASH_CTL_CRASH_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;
size_t size = ARRAY_SIZE(hv->hv_crash_param);
if (WARN_ON_ONCE(index >= size))
return -EINVAL;
hv->hv_crash_param[array_index_nospec(index, size)] = data;
return 0;
}
/*
* The kvmclock and Hyper-V TSC page use similar formulas, and converting