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virtio-iommu: Add bypass mode support to assigned device

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Currently assigned devices can not work in virtio-iommu bypass mode.
Guest driver fails to probe the device due to DMA failure. And the
reason is because of lacking GPA -> HPA mappings when VM is created.

Add a root container memory region to hold both bypass memory region
and iommu memory region, so the switch between them is supported
just like the implementation in virtual VT-d.

Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Message-Id: <20220613061010.2674054-2-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 2022-06-13 14:10:08 +08:00 • committed by Michael S. Tsirkin
parent b595d6272e
commit 90519b9053
3 changed files with 116 additions and 2 deletions
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2
include/hw/virtio/virtio-iommu.h
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@ -37,6 +37,8 @@ typedef struct IOMMUDevice {
int devfn;
IOMMUMemoryRegion iommu_mr;
AddressSpace as;
MemoryRegion root; /* The root container of the device */
MemoryRegion bypass_mr; /* The alias of shared memory MR */
} IOMMUDevice;
typedef struct IOMMUPciBus {