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

from [Jeremy Fitzhardinge] [Permanent Link][Original]
To: "Xu, Dongxiao" <dongxiao.xu@xxxxxxxxx>
Subject: [Xen-devel] Re: Live migration fails due to c/s 20627
From: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Date: Tue, 15 Dec 2009 10:25:45 -0800
Cc: Dan Magenheimer <dan.magenheimer@xxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, "kurt.hackel@xxxxxxxxxx" <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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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.

    J

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