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x86/kvm: Unify kvm_pv_guest_cpu_reboot() with kvm_guest_cpu_offline() 

Simplify the code by making PV features shutdown happen in one place.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Message-Id: <20210414123544.1060604-6-vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Vitaly Kuznetsov 2021-04-14 14:35:44 +02:00 committed by Paolo Bonzini
parent 3d6b84132d
commit 384fc672f5
1 changed files with 17 additions and 25 deletions
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42
arch/x86/kernel/kvm.c
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@ -384,31 +384,6 @@ static void kvm_disable_steal_time(void)
wrmsr(MSR_KVM_STEAL_TIME, 0, 0);
}
static void kvm_pv_guest_cpu_reboot(void *unused)
{
/*
* We disable PV EOI before we load a new kernel by kexec,
* since MSR_KVM_PV_EOI_EN stores a pointer into old kernel's memory.
* New kernel can re-enable when it boots.
*/
if (kvm_para_has_feature(KVM_FEATURE_PV_EOI))
wrmsrl(MSR_KVM_PV_EOI_EN, 0);
kvm_pv_disable_apf();
kvm_disable_steal_time();
}
static int kvm_pv_reboot_notify(struct notifier_block *nb,
unsigned long code, void *unused)
{
if (code == SYS_RESTART)
on_each_cpu(kvm_pv_guest_cpu_reboot, NULL, 1);
return NOTIFY_DONE;
}
static struct notifier_block kvm_pv_reboot_nb = {
.notifier_call = kvm_pv_reboot_notify,
};
static u64 kvm_steal_clock(int cpu)
{
u64 steal;
@ -687,6 +662,23 @@ static struct syscore_ops kvm_syscore_ops = {
.resume = kvm_resume,
};
static void kvm_pv_guest_cpu_reboot(void *unused)
{
kvm_guest_cpu_offline(true);
}
static int kvm_pv_reboot_notify(struct notifier_block *nb,
unsigned long code, void *unused)
{
if (code == SYS_RESTART)
on_each_cpu(kvm_pv_guest_cpu_reboot, NULL, 1);
return NOTIFY_DONE;
}
static struct notifier_block kvm_pv_reboot_nb = {
.notifier_call = kvm_pv_reboot_notify,
};
/*
* After a PV feature is registered, the host will keep writing to the
* registered memory location. If the guest happens to shutdown, this memory