From e33c8862bc50e67701803115884c26bc9a61da84 Mon Sep 17 00:00:00 2001
From: Sheng Yang <sheng@linux.intel.com>
Date: Thu, 21 May 2009 17:08:51 -0700
Subject: [PATCH 13/25] kvm: qemu: fix interrupt pin 0 assignment

Shouldn't update assigned irq if assigned device's interrupt pin is 0, which
means uninitialized or don't support INTx.

Signed-off-by: Sheng Yang <sheng@linux.intel.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
(cherry picked from commit 08b02f1d729663fbbd4e8c3dcd3998d50c0945e3)
Signed-off-by: Chris Wright <chrisw@redhat.com>
Bugzilla: 498085
Message-Id: <1242950943-30180-14-git-send-email-chrisw@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
RH-Upstream-status: applied
Acked-by: Juan Quintela <quintela@redhat.com>
Acked-by: Marcelo Tosatti <mtosatti@redhat.com>
Acked-by: Don Dutile <ddutile@redhat.com>
---
 qemu/hw/device-assignment.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/qemu/hw/device-assignment.c b/qemu/hw/device-assignment.c
index 9d65cde..7226f6a 100644
--- a/qemu/hw/device-assignment.c
+++ b/qemu/hw/device-assignment.c
@@ -591,6 +591,10 @@ static int assign_irq(AssignedDevInfo *adev)
     AssignedDevice *dev = adev->assigned_dev;
     int irq, r = 0;
 
+    /* Interrupt PIN 0 means don't use INTx */
+    if (pci_read_byte(dev->pdev, PCI_INTERRUPT_PIN) == 0)
+        return 0;
+
     irq = pci_map_irq(&dev->dev, dev->intpin);
     irq = piix_get_irq(irq);
 
-- 
1.6.3.rc4.29.g8146