Re: [Xen-devel] [PATCH v3 6/6] xen/arm: disable a physical IRQ when the guest disables the corresponding IRQ

[Julien Grall <julien.grall@xxxxxxxxxx>]

On 12/10/2013 06:50 PM, Stefano Stabellini wrote:
> Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
> Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
Acked-by: Julien Grall <julien.grall@xxxxxxxxxx>
> Changes in v2:
> - disable IRQs that were previously disabled.
> ---
>   xen/arch/arm/vgic.c |   18 ++++++++++++++++++
>   1 file changed, 18 insertions(+)
>
> diff --git a/xen/arch/arm/vgic.c b/xen/arch/arm/vgic.c
> index c35661e..30a413f 100644
> --- a/xen/arch/arm/vgic.c
> +++ b/xen/arch/arm/vgic.c
> @@ -360,6 +360,22 @@ read_as_zero:
>       return 1;
>   }
>
> +static void vgic_disable_irqs(struct vcpu *v, uint32_t r, int n)
> +{
> +    struct pending_irq *p;
> +    unsigned int irq;
> +    int i = 0;
> +
> +    while ( (i = find_next_bit((const long unsigned int *) &r, 32, i)) < 32 ) {
> +        irq = i + (32 * n);
> +        p = irq_to_pending(v, irq);
> +        clear_bit(_GIC_IRQ_GUEST_ENABLED, &p->status);
> +        if ( p->desc != NULL )
> +            p->desc->handler->disable(p->desc);
> +        i++;
> +    }
> +}
> +
>   static void vgic_enable_irqs(struct vcpu *v, uint32_t r, int n)
>   {
>       struct pending_irq *p;
> @@ -490,8 +506,10 @@ static int vgic_distr_mmio_write(struct vcpu *v, 
> mmio_info_t *info)
>           rank = vgic_irq_rank(v, 1, gicd_reg - GICD_ICENABLER);
>           if ( rank == NULL) goto write_ignore;
>           vgic_lock_rank(v, rank);
> +        tr = rank->ienable;
>           rank->ienable &= ~*r;
>           vgic_unlock_rank(v, rank);
> +        vgic_disable_irqs(v, (*r) & tr, gicd_reg - GICD_ICENABLER);
>           return 1;
>
>       case GICD_ISPENDR ... GICD_ISPENDRN:
--
Julien Grall

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