linux-kernel - Re: [PATCH 3/4] KVM: MMU: notrap it if gpte's reserved is set

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Message-ID: <4CE0FAA5.3040902@redhat.com>
Date:	Mon, 15 Nov 2010 11:17:25 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Xiao Guangrong <xiaoguangrong@...fujitsu.com>
CC:	Marcelo Tosatti <mtosatti@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>, KVM <kvm@...r.kernel.org>
Subject: Re: [PATCH 3/4] KVM: MMU: notrap it if gpte's reserved is set

On 11/15/2010 07:41 AM, Xiao Guangrong wrote:
> On 11/14/2010 06:56 PM, Avi Kivity wrote:
> >  On 11/12/2010 12:34 PM, Xiao Guangrong wrote:
> >>  We can past the page fault to guest directly if gpte's reserved
> >>  is set
> >>
> >
> >  How can that work? shadow_notrap_nonpresent_pte causes a fault with
> >  PFEC.P=PFEC.RSVD=0, while we need PFEC.P=PFEC.RSVD=1.
> >
>
> Ah, i missed it for a long time, thanks for you point it out.
>
> The same mistake is in 'prefetch' path, i'll fix it in the v2 version.

Doesn't access.flat catch this?

Ideally we'd have a test case to catch this, but it may be hard to write.

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

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