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[Xen-devel] RE: Live migration fails due to c/s 20627

To: Jeremy Fitzhardinge <jeremy@xxxxxxxx>, "Xu, Dongxiao" <dongxiao.xu@xxxxxxxxx>
Subject: [Xen-devel] RE: Live migration fails due to c/s 20627
From: Dan Magenheimer <dan.magenheimer@xxxxxxxxxx>
Date: Tue, 15 Dec 2009 11:20:23 -0800 (PST)
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx, kurt.hackel@xxxxxxxxxx, "Dugger, Donald D" <donald.d.dugger@xxxxxxxxx>, Keir Fraser <keir.fraser@xxxxxxxxxxxxx>, "Nakajima, Jun" <jun.nakajima@xxxxxxxxx>, "Zhang, Xiantao" <xiantao.zhang@xxxxxxxxx>
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> -----Original Message-----
> From: Jeremy Fitzhardinge [mailto:jeremy@xxxxxxxx]
> Sent: Tuesday, December 15, 2009 11:26 AM
> To: Xu, Dongxiao
> Cc: Dan Magenheimer; Keir Fraser; xen-devel@xxxxxxxxxxxxxxxxxxx; Kurt
> Hackel; Dugger, Donald D; Nakajima, Jun; Zhang, Xiantao
> Subject: Re: Live migration fails due to c/s 20627
> On 12/15/2009 09:24 AM, Xu, Dongxiao wrote:
> > If CPU has rdtsc but no rdtscp, then the VM exec control bit in VMCS
> > won't be turned on. Therefore if rdtscp instruction runs, 
> it will encounter
> > invalid op code directly but no VMEXIT.
> >    
> Ah, right.  You'd need to make that particular illegal 
> instruction vmexit.

Or make ALL illegal instructions vmexit, decode, if rdtscp
emulate it, else vmenter again.

Is this not done anyplace else in the hvm code?

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