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

[Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>]

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?

-- 
Best Regards,
Marek Marczykowski-Górecki
Invisible Things Lab
A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?

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