linux-kernel - Re: [PATCH v2 1/2] KVM: x86: introduce cancel_hv

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Date:	Wed, 29 Jun 2016 09:38:40 -0700
From:	yunhong jiang <yunhong.jiang@...ux.intel.com>
To:	Wanpeng Li <kernellwp@...il.com>
Cc:	linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
	Wanpeng Li <wanpeng.li@...mail.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Radim Krčmář <rkrcmar@...hat.com>,
	Yunhong Jiang <yunhong.jiang@...el.com>
Subject: Re: [PATCH v2 1/2] KVM: x86: introduce cancel_hv_tscdeadline

On Wed, 29 Jun 2016 19:23:56 +0800
Wanpeng Li <kernellwp@...il.com> wrote:

> From: Wanpeng Li <wanpeng.li@...mail.com>
> 
> Introduce cancel_hv_tscdeadline() to encapsulate preemption 
> timer cancel stuff.
> 
> 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>

It's ok for me, thanks for the patch, Wanpeng.

--jyh

> ---
>  arch/x86/kvm/lapic.c | 18 ++++++++++--------
>  1 file changed, 10 insertions(+), 8 deletions(-)
> 
> diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
> index fdc05ae..9c20ac1 100644
> --- a/arch/x86/kvm/lapic.c
> +++ b/arch/x86/kvm/lapic.c
> @@ -1349,14 +1349,19 @@ bool kvm_lapic_hv_timer_in_use(struct
> kvm_vcpu *vcpu) }
>  EXPORT_SYMBOL_GPL(kvm_lapic_hv_timer_in_use);
>  
> +static void cancel_hv_tscdeadline(struct kvm_lapic *apic)
> +{
> +	kvm_x86_ops->cancel_hv_timer(apic->vcpu);
> +	apic->lapic_timer.hv_timer_in_use = false;
> +}
> +
>  void kvm_lapic_expired_hv_timer(struct kvm_vcpu *vcpu)
>  {
>  	struct kvm_lapic *apic = vcpu->arch.apic;
>  
>  	WARN_ON(!apic->lapic_timer.hv_timer_in_use);
>  	WARN_ON(swait_active(&vcpu->wq));
> -	kvm_x86_ops->cancel_hv_timer(vcpu);
> -	apic->lapic_timer.hv_timer_in_use = false;
> +	cancel_hv_tscdeadline(apic);
>  	apic_timer_expired(apic);
>  }
>  EXPORT_SYMBOL_GPL(kvm_lapic_expired_hv_timer);
> @@ -1376,10 +1381,8 @@ void kvm_lapic_switch_to_hv_timer(struct
> kvm_vcpu *vcpu) hrtimer_cancel(&apic->lapic_timer.timer);
>  
>  			/* In case the sw timer triggered in the
> window */
> -			if (atomic_read(&apic->lapic_timer.pending))
> {
> -				apic->lapic_timer.hv_timer_in_use =
> false;
> -
> kvm_x86_ops->cancel_hv_timer(apic->vcpu);
> -			}
> +			if (atomic_read(&apic->lapic_timer.pending))
> +				cancel_hv_tscdeadline(apic);
>  		}
>  		trace_kvm_hv_timer_state(vcpu->vcpu_id,
>  				apic->lapic_timer.hv_timer_in_use);
> @@ -1395,8 +1398,7 @@ void kvm_lapic_switch_to_sw_timer(struct
> kvm_vcpu *vcpu) if (!apic->lapic_timer.hv_timer_in_use)
>  		return;
>  
> -	kvm_x86_ops->cancel_hv_timer(vcpu);
> -	apic->lapic_timer.hv_timer_in_use = false;
> +	cancel_hv_tscdeadline(apic);
>  
>  	if (atomic_read(&apic->lapic_timer.pending))
>  		return;