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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 12:44:57 +0000
  • List-id: Mini-os development list <minios-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




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