linux-kernel - Re: [PATCH 2/2] KVM: nVMX: make emulated nested preemption timer pinned

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Date:   Fri, 2 Sep 2016 12:48:16 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Wanpeng Li <kernellwp@...il.com>, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org
Cc:     Wanpeng Li <wanpeng.li@...mail.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Yunhong Jiang <yunhong.jiang@...el.com>
Subject: Re: [PATCH 2/2] KVM: nVMX: make emulated nested preemption timer
 pinned



On 30/08/2016 10:14, Wanpeng Li wrote:
> From: Wanpeng Li <wanpeng.li@...mail.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@...hat.com>
> Cc: Radim Krčmář <rkrcmar@...hat.com>
> Cc: Yunhong Jiang <yunhong.jiang@...el.com>
> Signed-off-by: Wanpeng Li <wanpeng.li@...mail.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