Re: [Xen-devel] [PATCH] x86/altp2m: Allow setting the #VE info page for an arbitrary VCPU

[Razvan Cojocaru <rcojocaru@xxxxxxxxxxxxxxx>]

On 07/31/2018 08:19 PM, Tamas K Lengyel wrote:
> On Tue, Jul 31, 2018 at 5:53 AM Jan Beulich <JBeulich@xxxxxxxx> wrote:
>> I'd like you to outline in the description how you mean an external
>> agent to coordinate the use of this GFN with the guest (and in
>> particular without in-guest agent).
> 
> Using #VE without an in-guest agent isn't really possible so this is
> really just about designating the page from dom0 instead of doing it
> with the in-guest agent. Something has to be present in the guest to
> handle the new interrupts coming from #VE after all. I could image a
> number of ways to coordinate that dom0 agent now setting this page
> with the guest, my immediate guess is that it would be done through
> the vm_event guest request channel. But it could also be done through
> xenstore or even ssh.

That's exactly what happens - they coordinate via the guest-request
vm_event. There's a #VE driver in the guest.


Thanks,
Razvan

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