linux-kernel - Re: [PATCH 3/4] KVM: MMU: track dirty page in speculative path properly

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Date:	Wed, 14 Jul 2010 13:53:27 +0800
From:	Xiao Guangrong <xiaoguangrong@...fujitsu.com>
To:	Xiao Guangrong <xiaoguangrong@...fujitsu.com>
CC:	Avi Kivity <avi@...hat.com>, LKML <linux-kernel@...r.kernel.org>,
	KVM list <kvm@...r.kernel.org>,
	Marcelo Tosatti <mtosatti@...hat.com>
Subject: Re: [PATCH 3/4] KVM: MMU: track dirty page in speculative path properly



Xiao Guangrong wrote:

>  
>  		spte = rmap_next(kvm, rmapp, NULL);
> @@ -1879,9 +1877,9 @@ static int set_spte(struct kvm_vcpu *vcpu, u64 *sptep,
>  	 * whether the guest actually used the pte (in order to detect
>  	 * demand paging).
>  	 */
> -	spte = shadow_base_present_pte | shadow_dirty_mask;
> +	spte = shadow_base_present_pte;
>  	if (!speculative)
> -		spte |= shadow_accessed_mask;
> +		spte |= shadow_accessed_mask | shadow_dirty_mask;

It breaks read-only shadow page, i'll update it... please ignore this version...
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