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

[Roger Pau Monné <roger.pau@xxxxxxxxxx>]

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.

Thanks, Roger.