linux-kernel - Re: [PATCH 16/22] KVM: MMU: Track page fault data in struct vcpu

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Message-ID: <4BDFEDFA.3090209@redhat.com>
Date:	Tue, 04 May 2010 12:50:50 +0300
From:	Avi Kivity <avi@...hat.com>
To:	"Roedel, Joerg" <Joerg.Roedel@....com>
CC:	Marcelo Tosatti <mtosatti@...hat.com>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 16/22] KVM: MMU: Track page fault data in struct vcpu

On 05/04/2010 12:45 PM, Avi Kivity wrote:
>
>
> Just a silly bug.  kvm_pdptr_read() can cause a guest memory read on 
> svm, in this case with the mmu lock taken.  I'll post something to fix 
> it.

I guess this was not reported because most svm machines have npt, and 
this requires npt=0 to trigger.  Nonpae paging disables npt, so you were 
hit.  Interestingly, nsvm makes it more likely to appear, since npt on 
i386+pae will need the pdptrs.

-- 
error compiling committee.c: too many arguments to function

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