[Xen-devel] [PATCH-4.5 4/4] xen/arm: set GICH_HCR_NPIE if all the LRs are in use

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On return to guest, if there are no free LRs and we still have more
interrupt to inject, set GICH_HCR_NPIE so that we are going to receive a
maintenance interrupt when no pending interrupts are present in the LR
registers.
The maintenance interrupt handler won't do anything anymore, but
receiving the interrupt is going to cause gic_inject to be called on
return to guest that is going to clear the old LRs and inject new
interrupts.

Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
---
 xen/arch/arm/gic.c |    8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/xen/arch/arm/gic.c b/xen/arch/arm/gic.c
index 87bd5d3..bee2618 100644
--- a/xen/arch/arm/gic.c
+++ b/xen/arch/arm/gic.c
@@ -810,8 +810,14 @@ void gic_inject(void)
     gic_restore_pending_irqs(current);
     if (!gic_events_need_delivery())
         gic_inject_irq_stop();
-    else
+    else {
         gic_inject_irq_start();
+    }
+
+    if ( !list_empty(&current->arch.vgic.lr_pending) )
+        GICH[GICH_HCR] = GICH_HCR_EN | GICH_HCR_NPIE;
+    else
+        GICH[GICH_HCR] = GICH_HCR_EN;
 }
 
 int gic_route_irq_to_guest(struct domain *d, const struct dt_irq *irq,
-- 
1.7.10.4


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