This series introduces an iova list associated with a vfio iommu. The list is kept updated taking care of iommu apertures, and reserved regions. Also this series adds checks for any conflict with existing dma mappings whenever a new device group is attached to the domain. User-space can retrieve valid iova ranges using VFIO_IOMMU_GET_INFO ioctl capability chains. Any dma map request outside the valid iova range will be rejected. v4 --> v5 Rebased to next-20180315. -Incorporated the corner case bug fix suggested by Alex to patch #5. -Based on suggestions by Alex and Robin, added patch#7. This moves the PCI window reservation back in to DMA specific path. This is to fix the issue reported by Eric[1]. Note: The patch #7 has dependency with [2][3] 1. https://patchwork.kernel.org/patch/10232043/ 2. https://patchwork.kernel.org/patch/10216553/ 3. https://patchwork.kernel.org/patch/10216555/ v3 --> v4 Addressed comments received for v3. -dma_addr_t instead of phys_addr_t -LIST_HEAD() usage. -Free up iova_copy list in case of error. -updated logic in filling the iova caps info(patch #5) RFCv2 --> v3 Removed RFC tag. Addressed comments from Alex and Eric: - Added comments to make iova list management logic more clear. - Use of iova list copy so that original is not altered in case of failure. RFCv1 --> RFCv2 Addressed comments from Alex: -Introduced IOVA list management and added checks for conflicts with existing dma map entries during attach/detach. Shameer Kolothum (2): vfio/type1: Add IOVA range capability support iommu/dma: Move PCI window region reservation back into dma specific path. Shameerali Kolothum Thodi (5): vfio/type1: Introduce iova list and add iommu aperture validity check vfio/type1: Check reserve region conflict and update iova list vfio/type1: Update iova list on detach vfio/type1: check dma map request is within a valid iova range vfio/type1: remove duplicate retrieval of reserved regions drivers/iommu/dma-iommu.c | 54 ++--- drivers/vfio/vfio_iommu_type1.c | 497 +++++++++++++++++++++++++++++++++++++++- include/uapi/linux/vfio.h | 23 ++ 3 files changed, 533 insertions(+), 41 deletions(-) -- 2.7.4
