linux-kernel - Re: [RFC PATCH v2 7/7] KVM: KVM: don't break vcpu 'halt' state due to apfs

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Date:	Wed, 03 Nov 2010 17:47:53 +0800
From:	Xiao Guangrong <xiaoguangrong@...fujitsu.com>
To:	Gleb Natapov <gleb@...hat.com>
CC:	Avi Kivity <avi@...hat.com>, Marcelo Tosatti <mtosatti@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>, KVM <kvm@...r.kernel.org>
Subject: Re: [RFC PATCH v2 7/7] KVM: KVM: don't break vcpu 'halt' state due
 to apfs

On 11/01/2010 08:55 PM, Gleb Natapov wrote:

> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index 2cfdf2d..f7aed95 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -5295,8 +5295,9 @@ static int __vcpu_run(struct kvm_vcpu *vcpu)
>  			{
>  				switch(vcpu->arch.mp_state) {
>  				case KVM_MP_STATE_HALTED:
> -					vcpu->arch.mp_state =
> -						KVM_MP_STATE_RUNNABLE;
> +					if (list_empty_careful(&vcpu->async_pf.done))
> +						vcpu->arch.mp_state =
> +							KVM_MP_STATE_RUNNABLE;
>  				case KVM_MP_STATE_RUNNABLE:
>  					vcpu->arch.apf.halted = false;
>  					break;
> @@ -6279,6 +6280,7 @@ void kvm_arch_async_page_present(struct kvm_vcpu *vcpu,
>  		vcpu->arch.fault.error_code = 0;
>  		vcpu->arch.fault.address = work->arch.token;
>  		kvm_inject_page_fault(vcpu);
> +		vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
>  	}
>  }
>  

Tested with full virtualization guests, it works well for me. Thanks!
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