Re: [Xen-devel] [PATCH v6 15/22] arm/acpi: Permit access all Xen unused SPIs for Dom0

[Julien Grall <julien.grall@xxxxxxx>]

Hi Shannon,

On 24/03/16 15:01, Shannon Zhao wrote:
> On 2016年03月23日 02:18, Julien Grall wrote:
> > > +     * Dom0 configures the interrupt, set the interrupt type and
> > > route it to
> > > +     * Dom0.
> > > +     */
> > > +    for( i = NR_LOCAL_IRQS; i < vgic_num_irqs(d); i++ )
> > > +    {
> > > +        desc = irq_to_desc(i);
> > > +        if( desc->action != NULL)
> > Well some of the SPIs used by Xen may not be registered yet. For
> > instance the SMMU driver doesn't register any SPIs until it's necessary
> > (i.e a device is assigned to a domain).
> But when SMMU requests some SPI, it will delete the route and
> reconfigure the SPI, right?
No, the SMMU driver will fail to request the interrupt if it's already 
in use.
Regards,

--
Julien Grall

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