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Re: [PATCH v2 2/5] Mini-OS: get own domid
- To: Roger Pau Monné <roger.pau@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Fri, 10 Nov 2023 13:44:50 +0100
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- Cc: minios-devel@xxxxxxxxxxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx, samuel.thibault@xxxxxxxxxxxx, wl@xxxxxxx, Juergen Gross <jgross@xxxxxxxx>
- Delivery-date: Fri, 10 Nov 2023 12:44:59 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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?
Jan
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