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

To: Dan Magenheimer <dan.magenheimer@xxxxxxxxxx>, Jeremy Fitzhardinge <jeremy@xxxxxxxx>, "Xu, Dongxiao" <dongxiao.xu@xxxxxxxxx>
Subject: [Xen-devel] Re: Live migration fails due to c/s 20627
From: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
Date: Tue, 15 Dec 2009 19:31:28 +0000
Cc: "kurt.hackel@xxxxxxxxxx" <kurt.hackel@xxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, "Nakajima, Jun" <jun.nakajima@xxxxxxxxx>, "Dugger, Donald D" <donald.d.dugger@xxxxxxxxx>, "Zhang, Xiantao" <xiantao.zhang@xxxxxxxxx>
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On 15/12/2009 19:20, "Dan Magenheimer" <dan.magenheimer@xxxxxxxxxx> wrote:

>> 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?

Oh, in fact I am wrong in my previous email, replying to Jeremy, claiming we
do not trap-and-emulate on illegal instructions. In fact we *do*, as it got
added to handle SYSCALL vs SYSENTER when migrating between Intel and AMD

So all that would need to be done is to add RDTSCP support to x86_emulate.c,
as it's currently missing. But that's pretty trivial.

 -- Keir

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