From: Peter Xu <peterx@redhat.com>

IR has been there for a long time and long time no bug reported.
Let's turn it on by default to match general hardwares.  Providing
compatibility bit for QEMU<=3.1.

Signed-off-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---
 include/hw/i386/pc.h | 4 ++++
 hw/i386/x86-iommu.c  | 2 +-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/include/hw/i386/pc.h b/include/hw/i386/pc.h
index c7c0c944e8..ed958b9af1 100644
--- a/include/hw/i386/pc.h
+++ b/include/hw/i386/pc.h
@@ -300,6 +300,10 @@ bool e820_get_entry(int, uint32_t, uint64_t *, uint64_t *);
         .driver   = "intel-iommu",\
         .property = "dma-drain",\
         .value    = "off",\
+    },{\
+        .driver   = "x86-iommu",\
+        .property = "intremap",\
+        .value    = "off",\
     },
 
 #define PC_COMPAT_3_0 \
diff --git a/hw/i386/x86-iommu.c b/hw/i386/x86-iommu.c
index abc3c03158..0150ceda14 100644
--- a/hw/i386/x86-iommu.c
+++ b/hw/i386/x86-iommu.c
@@ -135,7 +135,7 @@ static void x86_iommu_realize(DeviceState *dev, Error **errp)
 }
 
 static Property x86_iommu_properties[] = {
-    DEFINE_PROP_BOOL("intremap", X86IOMMUState, intr_supported, false),
+    DEFINE_PROP_BOOL("intremap", X86IOMMUState, intr_supported, true),
     DEFINE_PROP_BOOL("device-iotlb", X86IOMMUState, dt_supported, false),
     DEFINE_PROP_BOOL("pt", X86IOMMUState, pt_supported, true),
     DEFINE_PROP_END_OF_LIST(),
-- 
MST