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kvm: x86: implement KVM PM-notifier 

Implement PM hibernation/suspend prepare notifiers so that KVM
can reliably set PVCLOCK_GUEST_STOPPED on VCPUs and properly
suspend VMs.

Signed-off-by: Sergey Senozhatsky <senozhatsky@chromium.org>
Message-Id: <20210606021045.14159-2-senozhatsky@chromium.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sergey Senozhatsky 2021-06-06 11:10:45 +09:00 committed by Paolo Bonzini
parent 2fdef3a2ae
commit 7d62874f69
2 changed files with 37 additions and 0 deletions
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1
arch/x86/kvm/Kconfig
View File

@ -46,6 +46,7 @@ config KVM
select KVM_GENERIC_DIRTYLOG_READ_PROTECT
select KVM_VFIO
select SRCU
select HAVE_KVM_PM_NOTIFIER if PM
help
Support hosting fully virtualized guest machines using hardware
virtualization extensions. You will need a fairly recent

36
arch/x86/kvm/x86.c
View File

@ -58,6 +58,7 @@
#include <linux/sched/isolation.h>
#include <linux/mem_encrypt.h>
#include <linux/entry-kvm.h>
#include <linux/suspend.h>
#include <trace/events/kvm.h>
@ -5701,6 +5702,41 @@ static int kvm_vm_ioctl_set_msr_filter(struct kvm *kvm, void __user *argp)
return 0;
}
#ifdef CONFIG_HAVE_KVM_PM_NOTIFIER
static int kvm_arch_suspend_notifier(struct kvm *kvm)
{
struct kvm_vcpu *vcpu;
int i, ret = 0;
mutex_lock(&kvm->lock);
kvm_for_each_vcpu(i, vcpu, kvm) {
if (!vcpu->arch.pv_time_enabled)
continue;
ret = kvm_set_guest_paused(vcpu);
if (ret) {
kvm_err("Failed to pause guest VCPU%d: %d\n",
vcpu->vcpu_id, ret);
break;
}
}
mutex_unlock(&kvm->lock);
return ret ? NOTIFY_BAD : NOTIFY_DONE;
}
int kvm_arch_pm_notifier(struct kvm *kvm, unsigned long state)
{
switch (state) {
case PM_HIBERNATION_PREPARE:
case PM_SUSPEND_PREPARE:
return kvm_arch_suspend_notifier(kvm);
}
return NOTIFY_DONE;
}
#endif /* CONFIG_HAVE_KVM_PM_NOTIFIER */
long kvm_arch_vm_ioctl(struct file *filp,
unsigned int ioctl, unsigned long arg)
{