linux-kernel - Re: [kvm-devel] 2.6.23.1-rt4 and kvm 48

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Message-ID: <472716C1.1090102@siemens.com>
Date:	Tue, 30 Oct 2007 12:34:25 +0100
From:	Jan Kiszka <jan.kiszka@...mens.com>
To:	Avi Kivity <avi@...ranet.com>
CC:	kvm-devel@...ts.sourceforge.net,
	Carsten Emde <Carsten.Emde@...dl.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [kvm-devel] 2.6.23.1-rt4 and kvm 48

Avi Kivity wrote:
> Jan Kiszka wrote:
>> Interesting result - you've read about the wbinvd issues? Is there no
>> wbinvd in the bios shipped with older kvm? Which VM extension did you
>> test, both Intel and AMD? I would bet that your X issues are due to the
>> same effect. X startup/shutdown involves a lot of wbinvd calls on my
>> test boxes.
>>
>>   
> 
> kvm.git now traps invd and wbinvd on amd, so there shouldn't be any 
> issues there. 

So kvm can then simply ignore the instructions, or what does it do about
them? I recall some replies in the related thread that some more work
may be required.

> I hope that Intel will add similar traps in future 
> iterations of VT.

Yep.

Jan

-- 
Siemens AG, Corporate Technology, CT SE 2
Corporate Competence Center Embedded Linux
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