linux-kernel - Re: [PATCH] KVM: X86: Remove stale values from ctxt->memop before emulation

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Message-ID: <20120507104300.GJ4687@amd.com>
Date:	Mon, 7 May 2012 12:43:01 +0200
From:	Joerg Roedel <joerg.roedel@....com>
To:	Avi Kivity <avi@...hat.com>
CC:	Marcelo Tosatti <mtosatti@...hat.com>, <kvm@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] KVM: X86: Remove stale values from ctxt->memop before
 emulation

On Mon, May 07, 2012 at 01:18:01PM +0300, Avi Kivity wrote:
> On 05/07/2012 01:12 PM, Joerg Roedel wrote:
> >
> > The instruction emulation for bsrw is broken in KVM because
> > the code always uses bsr with 32 or 64 bit operand size for
> > emulation. Fix that by using emulate_2op_SrcV_nobyte() macro
> > to use guest operand size for emulation.
> >
> 
> It looks fine.  Do you know what triggered this regression?  (for
> figuring out if it's 3.4 material)

Looks like it is 3.4 (and -stable) material. I tested a few older
kernels and the test passes on 3.0 but fails on 3.2 an later kernels
(I have not tested 3.1).


	Joerg

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