linux-kernel - Re: [PATCH 2/2] KVM: SVM: Emulate next

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Message-ID: <20100728112540.GE26098@amd.com>
Date:	Wed, 28 Jul 2010 13:25:40 +0200
From:	"Roedel, Joerg" <Joerg.Roedel@....com>
To:	Avi Kivity <avi@...hat.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 2/2] KVM: SVM: Emulate next_rip svm feature

On Wed, Jul 28, 2010 at 06:28:06AM -0400, Avi Kivity wrote:
> We have a slightly different problem, if the nested guest manages to get 
> an instruction to be emulated by the host (if the guest assigned it the 
> cirrus framebuffer, for example, so from L1's point of view it is RAM, 
> but from L0's point of view it is emulated), then we miss the 
> intercept.  L2 could take over L1 this way.

I wonder how this could happen. Shouldn't the shadow paging code take
care of this?

	Joerg

-- 
Joerg Roedel - AMD Operating System Research Center

Advanced Micro Devices GmbH Einsteinring 24 85609 Dornach
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