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intel_iommu: Set default aw_bits to 48 starting from QEMU 9.2

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According to VTD spec, stage-1 page table could support 4-level and
5-level paging.

However, 5-level paging translation emulation is unsupported yet.
That means the only supported value for aw_bits is 48. So default
aw_bits to 48 when stage-1 translation is turned on.

For legacy and scalable modes, 48 is the default choice for modern
OS when both 48 and 39 are supported. So it makes sense to set
default to 48 for these two modes too starting from QEMU 9.2.
Use pc_compat_9_1 to handle the compatibility for machines before
9.2.

Suggested-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Reviewed-by: Clément Mathieu--Drif<clement.mathieu--drif@eviden.com>
Reviewed-by: Yi Liu <yi.l.liu@intel.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Message-Id: <20241212083757.605022-17-zhenzhong.duan@intel.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Zhenzhong Duan 2024-12-12 16:37:53 +08:00 committed by Michael S. Tsirkin
parent 9609d71018
commit ddd84fd0c1
2 changed files with 2 additions and 1 deletions
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1
hw/i386/pc.c
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@ -86,6 +86,7 @@ GlobalProperty pc_compat_9_1[] = {
{ "ICH9-LPC", "x-smi-swsmi-timer", "off" },
{ "ICH9-LPC", "x-smi-periodic-timer", "off" },
{ TYPE_INTEL_IOMMU_DEVICE, "stale-tm", "on" },
{ TYPE_INTEL_IOMMU_DEVICE, "aw-bits", "39" },
};
const size_t pc_compat_9_1_len = G_N_ELEMENTS(pc_compat_9_1);

2
include/hw/i386/intel_iommu.h
View File

@ -45,7 +45,7 @@ OBJECT_DECLARE_SIMPLE_TYPE(IntelIOMMUState, INTEL_IOMMU_DEVICE)
#define DMAR_REG_SIZE 0x230
#define VTD_HOST_AW_39BIT 39
#define VTD_HOST_AW_48BIT 48
#define VTD_HOST_ADDRESS_WIDTH VTD_HOST_AW_39BIT
#define VTD_HOST_ADDRESS_WIDTH VTD_HOST_AW_48BIT
#define VTD_HAW_MASK(aw) ((1ULL << (aw)) - 1)
#define DMAR_REPORT_F_INTR (1)