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

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Message-ID: <20100221121208.GJ20833@8bytes.org>
Date:	Sun, 21 Feb 2010 13:12:08 +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 02:00:29PM +0200, Avi Kivity wrote:
> On 02/21/2010 01:37 PM, Joerg Roedel wrote:
>> 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.
>>    
>
> Has the guest enabled wbinvd interception?  Perhaps not, so kvm has to  
> emulate wbinvd in the nested guest context, which is likely the only  
> case that we're called to do this.  So the problem might be in emulating  
> within the nested guest.

Probably, but this was running on nested-shadow where gva_to_gpa is
expected to work even when the vcpu is running in nested mode. I'll
check this again.

	Joerg

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