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Groups > linux.kernel > #1475026
| From | Paolo Bonzini <pbonzini@redhat.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH 2/2] KVM: nVMX: make emulated nested preemption timer pinned |
| Date | 2016-09-02 13:00 +0200 |
| Message-ID | <scUmu-6SO-13@gated-at.bofh.it> (permalink) |
| References | <sbMqZ-2gM-3@gated-at.bofh.it> <sbMqZ-2gM-9@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On 30/08/2016 10:14, Wanpeng Li wrote:
> From: Wanpeng Li <wanpeng.li@hotmail.com>
>
> Commit 61abdbe0bc ("kvm: x86: make lapic hrtimer pinned") pins the emulated
> lapic timer. This patch does the same for the emulated nested preemption
> timer to avoid vmexit an unrelated vCPU and the latency of kicking IPI to
> another vCPU.
>
> Cc: Paolo Bonzini <pbonzini@redhat.com>
> Cc: Radim Krčmář <rkrcmar@redhat.com>
> Cc: Yunhong Jiang <yunhong.jiang@intel.com>
> Signed-off-by: Wanpeng Li <wanpeng.li@hotmail.com>
> ---
> arch/x86/kvm/vmx.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
> index 5cede40..090a3f8 100644
> --- a/arch/x86/kvm/vmx.c
> +++ b/arch/x86/kvm/vmx.c
> @@ -7013,7 +7013,7 @@ static int handle_vmon(struct kvm_vcpu *vcpu)
> vmx->nested.vmcs02_num = 0;
>
> hrtimer_init(&vmx->nested.preemption_timer, CLOCK_MONOTONIC,
> - HRTIMER_MODE_REL);
> + HRTIMER_MODE_REL_PINNED);
> vmx->nested.preemption_timer.function = vmx_preemption_timer_fn;
>
> vmx->nested.vmxon = true;
>
Queued for 4.9, thanks.
Paolo
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[PATCH 1/2] KVM: lapic: fix preemption timer backward when TSC backward Wanpeng Li <kernellwp@gmail.com> - 2016-08-30 10:20 +0200
[PATCH 2/2] KVM: nVMX: make emulated nested preemption timer pinned Wanpeng Li <kernellwp@gmail.com> - 2016-08-30 10:20 +0200
Re: [PATCH 2/2] KVM: nVMX: make emulated nested preemption timer pinned Paolo Bonzini <pbonzini@redhat.com> - 2016-09-02 13:00 +0200
Re: [PATCH 1/2] KVM: lapic: fix preemption timer backward when TSC backward Paolo Bonzini <pbonzini@redhat.com> - 2016-09-02 13:00 +0200
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