linux-kernel - Re: [PATCH 0/9] KVM: Make the instruction emulator aware of Nested Virtualization

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Message-ID: <20101130084753.GF2258@amd.com>
Date:	Tue, 30 Nov 2010 09:47:53 +0100
From:	"Roedel, Joerg" <Joerg.Roedel@....com>
To:	"Valdis.Kletnieks@...edu" <Valdis.Kletnieks@...edu>
CC:	Joerg Roedel <joro@...tes.org>, Avi Kivity <avi@...hat.com>,
	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 0/9] KVM: Make the instruction emulator aware of Nested
 Virtualization

On Mon, Nov 29, 2010 at 03:01:10PM -0500, Valdis.Kletnieks@...edu wrote:
> On Mon, 29 Nov 2010 19:32:12 +0100, Joerg Roedel said:
> > On Mon, Nov 29, 2010 at 12:23:38PM -0500, Valdis.Kletnieks@...edu wrote:
> > > (Sorry for late reply...)
> > > 
> > > On Thu, 25 Nov 2010 17:23:13 +0100, "Roedel, Joerg" said:
> > > > On Thu, Nov 25, 2010 at 10:17:53AM -0500, Avi Kivity wrote:
> > > > > On 11/25/2010 03:13 PM, Roedel, Joerg wrote:
> > > > > What about things like adding instructions and forgetting to add the 
> > > > > corresponding svm.c code?
> > > > Cannot happen. Every instruction that can be intercepted with SVM is
> > > > already handled in this patch-set.
> > > 
> > > Call us back when Intel releases the i9 and i11 with new instructions
> > > that need intercept handling. ;)
> > 
> > How does that affect SVM?
> 
> It will quite possibly include instructions that can be intercepted with SVM
> that are not in this patch set.  At which point Joerg's comment can apply - it
> will be possible to add it in one place and forget to add it in the svm.c code.

SVM is AMD-only. So if an instruction does not exist on AMD there will
also be no specific intercept for it. For newly added instructions to
the AMD ISA which can then be intercepted I have to do bringup work
anyway. This will include adding these intercepts to the code in this
patch-set.

	Joerg

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