linux-kernel - Re: [PATCH] kvm mmu: fix another largepage memory leak

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Date:	Thu, 19 Feb 2009 10:20:25 -0300
From:	Marcelo Tosatti <mtosatti@...hat.com>
To:	Joerg Roedel <joerg.roedel@....com>
Cc:	Avi Kivity <avi@...hat.com>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] kvm mmu: fix another largepage memory leak


On Thu, Feb 19, 2009 at 12:18:56PM +0100, Joerg Roedel wrote:
> In the paging_fetch function rmap_remove is called after setting a large
> pte to non-present. This causes rmap_remove to not drop the reference to
> the large page. The result is a memory leak of that page.
> 
> Signed-off-by: Joerg Roedel <joerg.roedel@....com>
> ---
>  arch/x86/kvm/paging_tmpl.h |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h
> index 7314c09..0f11792 100644
> --- a/arch/x86/kvm/paging_tmpl.h
> +++ b/arch/x86/kvm/paging_tmpl.h
> @@ -306,9 +306,9 @@ static u64 *FNAME(fetch)(struct kvm_vcpu *vcpu, gva_t addr,
>  			continue;
>  
>  		if (is_large_pte(*sptep)) {
> +			rmap_remove(vcpu->kvm, sptep);
>  			set_shadow_pte(sptep, shadow_trap_nonpresent_pte);
>  			kvm_flush_remote_tlbs(vcpu->kvm);
> -			rmap_remove(vcpu->kvm, sptep);
>  		}
>  
>  		if (level == PT_DIRECTORY_LEVEL
> -- 

ACK

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