This series adds support for guests using the AMD vIOMMU to enable DMA remapping for VFIO devices. In addition to the currently supported passthrough (PT) mode, guest kernels are now able to to provide DMA address translation and access permission checking to VFs attached to paging domains, using the AMD v1 I/O page table format.
Please see v1[0] cover letter for additional details such as example QEMU command line parameters used in testing. Changes since v1[0]: - Added documentation entry for '-device amd-iommu' - Code movement with no functional changes to avoid use of forward declarations in later patches [Sairaj, mst] - Moved addr_translation and dma-remap property to separate commits. The dma-remap feature is only available for users to enable after all required functionality is implemented [Sairaj] - Explicit initialization of significant fields like addr_translation and notifier_flags [Sairaj] - Fixed bug in decoding of invalidation size [Sairaj] - Changed fetch_pte() to use an out parameter for pte, and be able to check for error conditions via negative return value [Clement] - Removed UNMAP-only notifier optimization, leaving vhost support for later series [Sairaj] - Fixed ordering between address space unmap and memory region activation on devtab invalidation [Sairaj] - Fixed commit message with "V=1, TV=0" [Sairaj] - Dropped patch removing the page_fault event. That area is better addressed in separate series. - Independent testing by Sairaj (thank you!) Thank you, Alejandro [0] https://lore.kernel.org/all/20250414020253.443831-1-alejandro.j.jime...@oracle.com/ Alejandro Jimenez (20): memory: Adjust event ranges to fit within notifier boundaries amd_iommu: Document '-device amd-iommu' common options amd_iommu: Reorder device and page table helpers amd_iommu: Helper to decode size of page invalidation command amd_iommu: Add helper function to extract the DTE amd_iommu: Return an error when unable to read PTE from guest memory amd_iommu: Add helpers to walk AMD v1 Page Table format amd_iommu: Add a page walker to sync shadow page tables on invalidation amd_iommu: Add basic structure to support IOMMU notifier updates amd_iommu: Sync shadow page tables on page invalidation amd_iommu: Use iova_tree records to determine large page size on UNMAP amd_iommu: Unmap all address spaces under the AMD IOMMU on reset amd_iommu: Add replay callback amd_iommu: Invalidate address translations on INVALIDATE_IOMMU_ALL amd_iommu: Toggle memory regions based on address translation mode amd_iommu: Set all address spaces to default translation mode on reset amd_iommu: Add dma-remap property to AMD vIOMMU device amd_iommu: Toggle address translation mode on devtab entry invalidation amd_iommu: Do not assume passthrough translation when DTE[TV]=0 amd_iommu: Refactor amdvi_page_walk() to use common code for page walk hw/i386/amd_iommu.c | 1005 ++++++++++++++++++++++++++++++++++++------- hw/i386/amd_iommu.h | 52 +++ qemu-options.hx | 23 + system/memory.c | 10 +- 4 files changed, 934 insertions(+), 156 deletions(-) base-commit: 5134cf9b5d3aee4475fe7e1c1c11b093731073cf -- 2.43.5
