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

["Jan Beulich" <JBeulich@xxxxxxxxxx>]

>>> Keir Fraser <keir.fraser@xxxxxxxxxxxxx> 07.08.09 12:53 >>>
>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?

Indeed. However, the fixup handler in this case can be trivial - it just
needs to restart the whole operation (including the have-I-been-resumed
check).

Jan


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