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SubjectRe: Xenner design and kvm msr handling
Gerd Hoffmann wrote:
> On 04/21/09 15:33, Avi Kivity wrote:
>> Gerd Hoffmann wrote:
>>> Not sure, have to dig into the xen code to figure.
>>>
>>> Could be xen doesn't remember the page in the first place. They might
>>> let the illegal instruction fault handler patch the opcode. At least I
>>> vaguely remember some discussions about that.
>
> Xen does a simple msr-triggered memcpy() as well, without keeping
> track of the page. On a quick glimpse I can't find a opcode patching
> place either. Hmm.
>

Maybe migration is cooperative, that is the host tells the guest it is
migrated, so it can re-register the hypercall area?

--
error compiling committee.c: too many arguments to function



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