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amd_iommu: Use shared memory region for Interrupt Remapping

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Use shared memory region for interrupt remapping which can be
aliased by all devices.

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: <20240927172913.121477-4-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 12:29:11 -05:00 committed by Michael S. Tsirkin
parent c1f46999ef
commit 9fc9dbac61
2 changed files with 15 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
hw/i386/amd_iommu.c
View File

@ -1443,7 +1443,7 @@ static AddressSpace *amdvi_host_dma_iommu(PCIBus *bus, void *opaque, int devfn)
* |--------------------+-------------------+----------+
* | amdvi-root | 00000000-ffffffff | 0 |
* | amdvi-iommu_nodma | 00000000-ffffffff | 0 |
* | amdvi-iommu_ir | fee00000-feefffff | 64 |
* | amdvi-iommu_ir | fee00000-feefffff | 1 |
* |--------------------+-------------------+----------|
*/
memory_region_init_iommu(&amdvi_dev_as->iommu,
@ -1454,13 +1454,6 @@ static AddressSpace *amdvi_host_dma_iommu(PCIBus *bus, void *opaque, int devfn)
memory_region_init(&amdvi_dev_as->root, OBJECT(s),
"amdvi_root", UINT64_MAX);
address_space_init(&amdvi_dev_as->as, &amdvi_dev_as->root, name);
memory_region_init_io(&amdvi_dev_as->iommu_ir, OBJECT(s),
&amdvi_ir_ops, s, "amd_iommu_ir",
AMDVI_INT_ADDR_SIZE);
memory_region_add_subregion_overlap(&amdvi_dev_as->root,
AMDVI_INT_ADDR_FIRST,
&amdvi_dev_as->iommu_ir,
64);
memory_region_add_subregion_overlap(&amdvi_dev_as->root, 0,
MEMORY_REGION(&amdvi_dev_as->iommu),
0);
@ -1472,6 +1465,13 @@ static AddressSpace *amdvi_host_dma_iommu(PCIBus *bus, void *opaque, int devfn)
memory_region_add_subregion_overlap(&amdvi_dev_as->root, 0,
&amdvi_dev_as->iommu_nodma,
0);
/* Build the Interrupt Remapping alias to shared memory */
memory_region_init_alias(&amdvi_dev_as->iommu_ir, OBJECT(s),
"amdvi-ir", &s->mr_ir, 0,
memory_region_size(&s->mr_ir));
memory_region_add_subregion_overlap(MEMORY_REGION(&amdvi_dev_as->iommu),
AMDVI_INT_ADDR_FIRST,
&amdvi_dev_as->iommu_ir, 1);
if (!x86_iommu->pt_supported) {
memory_region_set_enabled(&amdvi_dev_as->iommu_nodma, false);
@ -1633,6 +1633,12 @@ static void amdvi_sysbus_realize(DeviceState *dev, Error **errp)
memory_region_add_subregion_overlap(&s->mr_sys, 0,
&s->mr_nodma, 0);
/* set up the Interrupt Remapping memory region */
memory_region_init_io(&s->mr_ir, OBJECT(s), &amdvi_ir_ops,
s, "amdvi-ir", AMDVI_INT_ADDR_SIZE);
memory_region_add_subregion_overlap(&s->mr_sys, AMDVI_INT_ADDR_FIRST,
&s->mr_ir, 1);
pci_setup_iommu(bus, &amdvi_iommu_ops, s);
amdvi_init(s);
}

1
hw/i386/amd_iommu.h
View File

@ -356,6 +356,7 @@ struct AMDVIState {
MemoryRegion mr_mmio; /* MMIO region */
MemoryRegion mr_sys;
MemoryRegion mr_nodma;
MemoryRegion mr_ir;
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 */