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amd_iommu: Add support for pass though mode

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Introduce 'nodma' shared memory region to support PT mode
so that for each device, we only create an alias to shared memory
region when DMA-remapping is disabled.

Reviewed-by: Alejandro Jimenez <alejandro.j.jimenez@oracle.com>
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Signed-off-by: Santosh Shukla <santosh.shukla@amd.com>
Message-Id: <20240927172913.121477-3-santosh.shukla@amd.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Suravee Suthikulpanit 2024-09-27 12:29:10 -05:00 • committed by Michael S. Tsirkin
parent 2e6f051cfc
commit c1f46999ef
2 changed files with 42 additions and 9 deletions
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2
hw/i386/amd_iommu.h
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@ -354,6 +354,8 @@ struct AMDVIState {
uint32_t pprlog_tail; /* ppr log tail */
MemoryRegion mr_mmio; /* MMIO region */
MemoryRegion mr_sys;
MemoryRegion mr_nodma;
uint8_t mmior[AMDVI_MMIO_SIZE]; /* read/write MMIO */
uint8_t w1cmask[AMDVI_MMIO_SIZE]; /* read/write 1 clear mask */
uint8_t romask[AMDVI_MMIO_SIZE]; /* MMIO read/only mask */