[Qemu-devel] [PATCH 05/28] PPC: Set MPIC IDE for IPI to 0

[Alexander Graf]

We use the IDE register with IPIs as a mask to keep track which processors
have already acknowledged the respective interrupt. So we need to initialize
it to 0 to make sure that it doesn't accidently fire an IPI on CPU0 when the
first IPI is triggered.

Reported-by: Elie Richa <address@hidden>
Signed-off-by: Alexander Graf <address@hidden>
---
 hw/openpic.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/hw/openpic.c b/hw/openpic.c
index 9ac3b3d..1f7753d 100644
--- a/hw/openpic.c
+++ b/hw/openpic.c
@@ -1304,6 +1304,10 @@ static void mpic_reset (void *opaque)
         mpp->src[i].ipvp = 0x80800000;
         mpp->src[i].ide  = 0x00000001;
     }
+    /* Set IDE for IPIs to 0 so we don't get spurious interrupts */
+    for (i = mpp->irq_ipi0; i < MAX_IPI; i++) {
+        mpp->src[i].ide = 0;
+    }
     /* Initialise IRQ destinations */
     for (i = 0; i < MAX_CPU; i++) {
         mpp->dst[i].pctp      = 0x0000000F;
-- 
1.6.0.2