Re: [PATCH v2 2/5] Mini-OS: get own domid

[Julien Grall <julien@xxxxxxx>]

Hi Jan,

On 10/11/2023 12:44, Jan Beulich wrote:
> On 10.11.2023 13:23, Roger Pau Monné wrote:
> > On Fri, Nov 10, 2023 at 12:34:32PM +0100, Juergen Gross wrote:
> > > Get the own domid via creation of a temporary event channel. There is
> > > no "official" way to read the own domid in PV guests, so use the event
> > > channel interface to get it:
> > >
> > > - allocate an unbound event channel specifying DOMID_SELF for the
> > >    other end
> > >
> > > - read the event channel status which will contain the own domid in
> > >    unbound.dom
> > >
> > > - close the event channel
> > Should we look into introducing a way to expose the domid, so that in
> > the future we might not need to resort to this workarounds to get the
> > domid?
> >
> > Maybe in the PV-specific cpuid leaf?  It's a shame we didn't put it in
> > a non-HVM specific leaf when it was made available to HVM for pvshim
> > reasons.
> Couldn't we retroactively generalize the type-agnostic parts of that
> leaf?
This would only work for x86. I think we want to have a generic 
hypercalls so it can be used by all arch.
Cheers,

--
Julien Grall