Re: Xenner design and kvm msr handling

[Gerd Hoffmann]

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.

> > Could be there isn't a interface to forgot the page. "reboot" in xen
> > land is "destroy guest, restart it".
>
> How do you unload a driver then?

The linux module (xen-platform-pci) has no module_exit() ...

cheers,
  Gerd
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