Re: [Xen-devel] [PATCH v6 3/5] xen/arm: support irq delivery to vcpu > 0

[Julien Grall <julien.grall@xxxxxxxxxx>]

Hi Stefano,

On 06/23/2014 05:37 PM, Stefano Stabellini wrote:
> diff --git a/xen/arch/arm/gic.c b/xen/arch/arm/gic.c
> index c7dda9b..54610ce 100644
> --- a/xen/arch/arm/gic.c
> +++ b/xen/arch/arm/gic.c
> @@ -292,7 +292,7 @@ void gic_route_irq_to_guest(struct domain *d, struct 
> irq_desc *desc,
>  
>      gic_set_irq_properties(desc, cpumask_of(smp_processor_id()), 
> GIC_PRI_IRQ);
>  
> -    /* TODO: do not assume delivery to vcpu0 */
> +    /* Route to vcpu0 by default */

This comment is wrong here... we only set the desc for a virtual SPIs.

The routing is done in domain_vgic_init.

> +void vgic_vcpu_inject_spi(struct domain *d, unsigned int irq)
> +{
> +    struct vcpu *v;
> +
> +    /* the IRQ needs to be an SPI */
> +    ASSERT(irq >= 32 && irq <= 1019);

I would use gic_number_lines() rather than 1019 here.

If the IRQ is greater than the return value of the function then there
is already an issue.

IHMO, your ASSERT is implementing your comment in do_IRQ. So it would
make sense to have this ASSERT just before calling vgic_vcpu_inject_spi.

If the caller is calling this function with a PPIs or SGIs then he is
stupid.

Regards,

-- 
Julien Grall

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