[PATCH v4 6/6] xen/arm: disable a physical IRQ when the guest disables the corresponding IRQ

[Stefano Stabellini <stefano.stabellini@eu.citrix.com>]

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Julien Grall <julien.grall@linaro.org>

---
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 ad17d1d..9022658 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:
-- 
1.7.10.4