linux-kernel - Re: [PATCH v2 01/22] KVM: MMU: fix walking shadow page table

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Date:	Wed, 22 Jun 2011 14:13:36 -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 v2 01/22] KVM: MMU: fix walking shadow page table

On Wed, Jun 22, 2011 at 10:28:04PM +0800, Xiao Guangrong wrote:
> Properly check the last mapping, and do not walk to the next level if last spte
> is met
> 
> Signed-off-by: Xiao Guangrong <xiaoguangrong@...fujitsu.com>
> ---
>  arch/x86/kvm/mmu.c |    9 +++++----
>  1 files changed, 5 insertions(+), 4 deletions(-)
> 
> diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
> index 9c629b5..f474e93 100644
> --- a/arch/x86/kvm/mmu.c
> +++ b/arch/x86/kvm/mmu.c
> @@ -1517,10 +1517,6 @@ static bool shadow_walk_okay(struct kvm_shadow_walk_iterator *iterator)
>  	if (iterator->level < PT_PAGE_TABLE_LEVEL)
>  		return false;
>  
> -	if (iterator->level == PT_PAGE_TABLE_LEVEL)

Change to >= PT_PAGE_TABLE_LEVEL, checks should be in shadow_walk_okay.

> -		if (is_large_pte(*iterator->sptep))
> -			return false;
> -
>  	iterator->index = SHADOW_PT_INDEX(iterator->addr, iterator->level);
>  	iterator->sptep	= ((u64 *)__va(iterator->shadow_addr)) + iterator->index;
>  	return true;
--
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