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Re: [Xen-devel] resume of HVM guest without PV drivers

To: Jan Beulich <JBeulich@xxxxxxxxxx>
Subject: Re: [Xen-devel] resume of HVM guest without PV drivers
From: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
Date: Fri, 07 Aug 2009 11:53:04 +0100
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On 07/08/2009 11:35, "Jan Beulich" <JBeulich@xxxxxxxxxx> wrote:

> Besides that, doing hypercalls here also requires that I'll be able to re-
> setup the hypercall (or the hypercall page) in case I got migrated
> between VMX and SVM. While this could certainly be done in a fixup
> handler invoked from #UD (a little tricky for the hypercall page case), I
> find it preferable to synchronously fix things up beforehand.

Won't you always have a race between checking for migration and then
entering the cpu-specific hypercall stub?

 -- Keir

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