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

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 31.07.18 at 19:19, <tamas@xxxxxxxxxxxxx> wrote:
> On Tue, Jul 31, 2018 at 5:53 AM Jan Beulich <JBeulich@xxxxxxxx> wrote:
>> >>> On 25.07.18 at 13:49, <apop@xxxxxxxxxxxxxxx> wrote:
>> > -        vcpu_altp2m(curr).veinfo_gfn = _gfn(a.u.enable_notify.gfn);
>> > -        altp2m_vcpu_update_vmfunc_ve(curr);
>> > +        vcpu_altp2m(v).veinfo_gfn = _gfn(a.u.enable_notify.gfn);
>> > +        altp2m_vcpu_update_vmfunc_ve(v);
>>
>> 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.

Not necessarily - the exception could also be intercepted, and the
external agent be informed, with it taking appropriate action.

Anyway - if such a dependency continues to exist, I think it would
be desirable to mention it in the description.

Jan



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