On Fri, May 02, 2025 at 02:15:45AM +0000, Alejandro Jimenez wrote: > 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.
Suravee you are active there, maybe you can take a look at AMD bits, too? > 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
