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Message-ID: <4B460664.1090006@redhat.com>
Date: Thu, 07 Jan 2010 18:05:56 +0200
From: Avi Kivity <avi@...hat.com>
To: Roel Kluin <roel.kluin@...il.com>
CC: Marcelo Tosatti <mtosatti@...hat.com>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>,
"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] kvm: don't treat NULL parent_pte as multimapped in mmu_parent_walk()
On 01/07/2010 05:56 PM, Roel Kluin wrote:
> If a kvm_mmu_page is not multimapped but parent_pte is NULL
> don't treat it as multimapped and dereference it.
>
> Signed-off-by: Roel Kluin<roel.kluin@...il.com>
> ---
> This wasn't tested and maybe I misunderstood so please review.
>
> diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
> index 4c3e5b2..eb17287 100644
> --- a/arch/x86/kvm/mmu.c
> +++ b/arch/x86/kvm/mmu.c
> @@ -1031,10 +1031,12 @@ static void mmu_parent_walk(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp,
> struct kvm_mmu_page *parent_sp;
> int i;
>
> - if (!sp->multimapped&& sp->parent_pte) {
> - parent_sp = page_header(__pa(sp->parent_pte));
> - fn(vcpu, parent_sp);
> - mmu_parent_walk(vcpu, parent_sp, fn);
> + if (!sp->multimapped) {
> + if (sp->parent_pte) {
> + parent_sp = page_header(__pa(sp->parent_pte));
> + fn(vcpu, parent_sp);
> + mmu_parent_walk(vcpu, parent_sp, fn);
> + }
> return;
> }
> hlist_for_each_entry(pte_chain, node,&sp->parent_ptes, link)
>
>
If sp->parent_pte is NULL then the list walk terminates immediately.
--
error compiling committee.c: too many arguments to function
--
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