linux-kernel - Re: [PATCH 2/10] KVM: MMU: fix kvm_mmu_get_spte

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Date:	Sat, 5 Mar 2011 13:48:05 -0300
From:	Marcelo Tosatti <mtosatti@...hat.com>
To:	Xiao Guangrong <xiaoguangrong@...fujitsu.com>
Cc:	Avi Kivity <avi@...hat.com>, LKML <linux-kernel@...r.kernel.org>,
	KVM <kvm@...r.kernel.org>
Subject: Re: [PATCH 2/10] KVM: MMU: fix kvm_mmu_get_spte_hierarchy

On Fri, Mar 04, 2011 at 06:57:27PM +0800, Xiao Guangrong wrote:
> Don not walk to the next level if spte is mapping to the large page
> 
> Signed-off-by: Xiao Guangrong <xiaoguangrong@...fujitsu.com>
> ---
>  arch/x86/kvm/mmu.c |    3 ++-
>  1 files changed, 2 insertions(+), 1 deletions(-)
> 
> diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
> index b9bf016..10e0982 100644
> --- a/arch/x86/kvm/mmu.c
> +++ b/arch/x86/kvm/mmu.c
> @@ -3819,7 +3819,8 @@ int kvm_mmu_get_spte_hierarchy(struct kvm_vcpu *vcpu, u64 addr, u64 sptes[4])
>  	for_each_shadow_entry(vcpu, addr, iterator) {
>  		sptes[iterator.level-1] = *iterator.sptep;
>  		nr_sptes++;
> -		if (!is_shadow_present_pte(*iterator.sptep))
> +		if (!is_shadow_present_pte(*iterator.sptep) ||
> +		      is_last_spte(*iterator.sptep, iterator.level))
>  			break;
>  	}
>  	spin_unlock(&vcpu->kvm->mmu_lock);

shadow_walk_okay covers that case.

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