Re: [Xen-devel] [PATCH v5 4/6] xen/x86: Allow stubdom access to irq created for msi.

[Julien Grall <julien.grall@xxxxxxx>]

Hi,

On 7/20/19 10:21 PM, Marek Marczykowski-Górecki wrote:
> On Sat, Jul 20, 2019 at 05:48:56PM +0100, Julien Grall wrote:
> > Hi,
> >
> > Sorry for jumping late in the discussion.
> >
> > On 7/17/19 2:00 AM, Marek Marczykowski-Górecki wrote:
> > > diff --git a/xen/include/xen/irq.h b/xen/include/xen/irq.h
> > > index 586b783..c7a6a83 100644
> > > --- a/xen/include/xen/irq.h
> > > +++ b/xen/include/xen/irq.h
> > > @@ -91,6 +91,7 @@ typedef struct irq_desc {
> > >        spinlock_t lock;
> > >        struct arch_irq_desc arch;
> > >        cpumask_var_t affinity;
> > > +    domid_t creator_domid; /* weak reference to domain handling this IRQ */
> > This x86 only. Can this be moved in arch_irq_desc to avoid increasing the
> > structure on Arm?
> How (if at all) PCI passthrough is supported on ARM? Is qemu involved?
> If so, and if that qemu would be isolated in stubdomain, I think ARM
> would need a similar feature. If it not the case right now, but it is
> planned, do you think it's worth moving it to arch_irq_desc and possibly
> move back later?
PCI passthrough is not yet supported on Arm. However, I would not expect 
QEMU to be involved at all for Arm.
In any case, I would still prefer to keep field in arch_irq_desc until 
we see any usage on Arm.
Cheers,

--
Julien Grall

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