diff mbox

[1/3] KVM: x86: handle 0 write to TSC_DEADLINE MSR

Message ID 20171006172555.30087-2-rkrcmar@redhat.com (mailing list archive)
State New, archived
Headers show

Commit Message

Radim Krčmář Oct. 6, 2017, 5:25 p.m. UTC 
0 should disable the timer, but start_hv_timer will recognize it as an
expired timer instead.

Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
---
 arch/x86/kvm/lapic.c | 3 +++
 1 file changed, 3 insertions(+)

Comments

Wanpeng Li Oct. 7, 2017, 12:26 a.m. UTC | #1 
2017-10-07 1:25 GMT+08:00 Radim Krčmář <rkrcmar@redhat.com>:
> 0 should disable the timer, but start_hv_timer will recognize it as an
> expired timer instead.
>
> Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>

Reviewed-by: Wanpeng Li <wanpeng.li@hotmail.com>

> ---
>  arch/x86/kvm/lapic.c | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
> index 2c9e88a82738..39c1ae11ce1d 100644
> --- a/arch/x86/kvm/lapic.c
> +++ b/arch/x86/kvm/lapic.c
> @@ -1549,6 +1549,9 @@ static bool start_hv_timer(struct kvm_lapic *apic)
>         if (!apic_lvtt_period(apic) && atomic_read(&ktimer->pending))
>                 return false;
>
> +       if (!ktimer->tscdeadline)
> +               return false;
> +
>         r = kvm_x86_ops->set_hv_timer(apic->vcpu, ktimer->tscdeadline);
>         if (r < 0)
>                 return false;
> --
> 2.14.2
>
diff mbox

Patch

diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index 2c9e88a82738..39c1ae11ce1d 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -1549,6 +1549,9 @@  static bool start_hv_timer(struct kvm_lapic *apic)
 	if (!apic_lvtt_period(apic) && atomic_read(&ktimer->pending))
 		return false;
 
+	if (!ktimer->tscdeadline)
+		return false;
+
 	r = kvm_x86_ops->set_hv_timer(apic->vcpu, ktimer->tscdeadline);
 	if (r < 0)
 		return false;