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

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Date:	Thu, 25 Nov 2010 17:23:13 +0100
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 0/9] KVM: Make the instruction emulator aware of Nested
 Virtualization

On Thu, Nov 25, 2010 at 10:17:53AM -0500, Avi Kivity wrote:
> On 11/25/2010 03:13 PM, Roedel, Joerg wrote:
> > On Thu, Nov 25, 2010 at 12:46:40PM +0100, Roedel, Joerg wrote:
> > >  We basically have two choices here:
> > >
> > >  	a) We expose svm internals into the emulator
> > >  	b) We expose emulator internals into svm
> > >
> > >  Both choices are not really good from a software-design point-of-view.
> > >  But I think option b) is the better one because it is easier to cope with
> > >  and thus less likely to break when changing the emulator code.
> >
> > What we could do probably is to define the interface between the
> > emulator and the architecture code in a better way. This would take the
> > burden of going into architecture code for emulator changes away.
> 
> 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.

> Good idea.  Needed for the decode bits thing as well.

Especially needed to not kill the L1 guest when an L2 instruction
emulation fails :)

	Joerg

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