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hw/i386/q35: Set virtio-iommu aw-bits default value to 39

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Currently the default input range can extend to 64 bits. On x86,
when the virtio-iommu protects vfio devices, the physical iommu
may support only 39 bits. Let's set the default to 39, as done
for the intel-iommu.

We use hw_compat_8_2 to handle the compatibility for machines
before 9.0 which used to have a virtio-iommu default input range
of 64 bits.

Of course if aw-bits is set from the command line, the default
is overriden.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Message-Id: <20240307134445.92296-8-eric.auger@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
This commit is contained in:
Eric Auger 2024-03-07 14:43:08 +01:00 • committed by Michael S. Tsirkin
parent 01e7e4921c
commit 9b588be373
3 changed files with 11 additions and 1 deletions
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1
hw/core/machine.c
View file

@ -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);

9
hw/i386/pc_q35.c
View file

@ -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)