linux-kernel - Re: [PATCH v3 5/6] KVM: MMU: abstract invalid guest pte mapping

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Message-ID: <4CEA4334.5070106@redhat.com>
Date:	Mon, 22 Nov 2010 12:17:24 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Xiao Guangrong <xiaoguangrong@...fujitsu.com>
CC:	Marcelo Tosatti <mtosatti@...hat.com>, KVM <kvm@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 5/6] KVM: MMU: abstract invalid guest pte mapping

On 11/22/2010 12:18 PM, Xiao Guangrong wrote:
> >
> >  I think the order is reversed.  If !is_present_gpte(), it doesn't matter
> >  if reserved bits are set or not.
> >
>
> if !is_present_gpte()&&  is_rsvd_bits_set, then we may mark the spte notrap,
> so the guest will detect #PF with PFEC.P=PEFC.RSVD=0, but the appropriate PFEC
> is PFEC.P=0&&  PEFC.RSVD=1 ?

I think the correct PFEC is .P = .RSVD = 0, but best to check on real 
hardware to be sure.

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

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