[Qemu-devel] [PATCH v3 12/20] intc/arm_gic: Implement virtualization extensions in gic_complete_irq

[Luc Michel <luc.michel@greensocs.com>]

Implement virtualization extensions in the gic_complete_irq() function.
When a guest tries to end an IRQ that does not exist in the LRs, the
EOICount field of the virtual interface HCR register is incremented by
one, and the request is ignored.

Signed-off-by: Luc Michel <luc.michel@greensocs.com>
---
 hw/intc/arm_gic.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/hw/intc/arm_gic.c b/hw/intc/arm_gic.c
index a7577ac073..434dc9c7b2 100644
--- a/hw/intc/arm_gic.c
+++ b/hw/intc/arm_gic.c
@@ -605,6 +605,15 @@ static void gic_complete_irq(GICState *s, int cpu, int irq, MemTxAttrs attrs)
     int group;
 
     DPRINTF("EOI %d\n", irq);
+    if (gic_is_vcpu(cpu) && !gic_virq_is_valid(s, irq, cpu)) {
+        /* This vIRQ does not have a valid LR entry. Increment EOICount and
+         * ignore the write.
+         */
+        int rcpu = gic_get_vcpu_real_id(cpu);
+        s->h_hcr[rcpu] += 1 << R_GICH_HCR_EOICount_SHIFT;
+        return;
+    }
+
     if (irq >= s->num_irq) {
         /* This handles two cases:
          * 1. If software writes the ID of a spurious interrupt [ie 1023]
-- 
2.17.1