linux-kernel - Re: [PATCH 11/11] KVM: SVM: Don't call instruction emulator for invd and wbinvd

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Message-ID: <20100221113708.GH20833@8bytes.org>
Date:	Sun, 21 Feb 2010 12:37:08 +0100
From:	Joerg Roedel <joro@...tes.org>
To:	Avi Kivity <avi@...hat.com>
Cc:	Joerg Roedel <joerg.roedel@....com>,
	Marcelo Tosatti <mtosatti@...hat.com>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 11/11] KVM: SVM: Don't call instruction emulator for
	invd and wbinvd

On Sun, Feb 21, 2010 at 11:53:14AM +0200, Avi Kivity wrote:
> On 02/19/2010 05:23 PM, Joerg Roedel wrote:
>> There is an intercept for WBINVD and INVD in SVM so we don't
>> need the instruction emulator. The primary reason is that
>> the current instruction emulator fails to emulate these
>> instructions and the rip is not advanced.
>>    
>
> The bios (at least bochs bios) does have wbinvd, so this ought to work.

Weird. For some reason the Windows 7 XP emulation was executing wbinvd
which caused an nested intercept for the host level and the rip was not
advanced. So the nested guest did not advance and just produces wbinvd
intercepts all the time.

	Joerg

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