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-rw-r--r--hw/core/machine.c1
-rw-r--r--hw/i386/pc_q35.c9
2 files changed, 10 insertions, 0 deletions
diff --git a/hw/core/machine.c b/hw/core/machine.c
index 6bd09d4592..4b89172d1c 100644
--- a/hw/core/machine.c
+++ b/hw/core/machine.c
@@ -35,6 +35,7 @@
 
 GlobalProperty hw_compat_8_2[] = {
     { TYPE_VIRTIO_IOMMU_PCI, "granule", "4k" },
+    { TYPE_VIRTIO_IOMMU_PCI, "aw-bits", "64" },
 };
 const size_t hw_compat_8_2_len = G_N_ELEMENTS(hw_compat_8_2);
 
diff --git a/hw/i386/pc_q35.c b/hw/i386/pc_q35.c
index 1356c5d107..8a427c4647 100644
--- a/hw/i386/pc_q35.c
+++ b/hw/i386/pc_q35.c
@@ -45,6 +45,7 @@
 #include "hw/i386/pc.h"
 #include "hw/i386/amd_iommu.h"
 #include "hw/i386/intel_iommu.h"
+#include "hw/virtio/virtio-iommu.h"
 #include "hw/display/ramfb.h"
 #include "hw/ide/pci.h"
 #include "hw/ide/ahci-pci.h"
@@ -63,6 +64,12 @@
 /* ICH9 AHCI has 6 ports */
 #define MAX_SATA_PORTS     6
 
+static GlobalProperty pc_q35_compat_defaults[] = {
+    { TYPE_VIRTIO_IOMMU_PCI, "aw-bits", "39" },
+};
+static const size_t pc_q35_compat_defaults_len =
+    G_N_ELEMENTS(pc_q35_compat_defaults);
+
 struct ehci_companions {
     const char *name;
     int func;
@@ -354,6 +361,8 @@ static void pc_q35_machine_options(MachineClass *m)
     machine_class_allow_dynamic_sysbus_dev(m, TYPE_INTEL_IOMMU_DEVICE);
     machine_class_allow_dynamic_sysbus_dev(m, TYPE_RAMFB_DEVICE);
     machine_class_allow_dynamic_sysbus_dev(m, TYPE_VMBUS_BRIDGE);
+    compat_props_add(m->compat_props,
+                     pc_q35_compat_defaults, pc_q35_compat_defaults_len);
 }
 
 static void pc_q35_9_0_machine_options(MachineClass *m)