This patch series adds support for vq descriptor table mappings which are used to improve vdpa live migration downtime. The improvement comes from using smaller mappings which take less time to create and destroy in hw. The first part adds the vdpa core changes from Si-Wei [0]. The second part adds support in mlx5_vdpa: - Refactor the mr code to be able to cleanly add descriptor mappings. - Add hardware descriptor mr support. - Properly update iotlb for cvq during ASID switch. Changes in v2: - The "vdpa/mlx5: Enable hw support for vq descriptor mapping" change was split off into two patches to avoid merge conflicts into the tree of Linus. The first patch contains only changes for mlx5_ifc.h. This must be applied into the mlx5-next tree [1] first. Once this patch is applied on mlx5-next, the change has to be pulled fom mlx5-next into the vhost tree and only then the remaining patches can be applied. [0] https://lore.kernel.org/virtualization/1694248959-13369-1-git-send-email-si-wei.liu@xxxxxxxxxx [1] https://git.kernel.org/pub/scm/linux/kernel/git/mellanox/linux.git/log/?h=mlx5-next Dragos Tatulea (13): vdpa/mlx5: Expose descriptor group mkey hw capability vdpa/mlx5: Create helper function for dma mappings vdpa/mlx5: Decouple cvq iotlb handling from hw mapping code vdpa/mlx5: Take cvq iotlb lock during refresh vdpa/mlx5: Collapse "dvq" mr add/delete functions vdpa/mlx5: Rename mr destroy functions vdpa/mlx5: Allow creation/deletion of any given mr struct vdpa/mlx5: Move mr mutex out of mr struct vdpa/mlx5: Improve mr update flow vdpa/mlx5: Introduce mr for vq descriptor vdpa/mlx5: Enable hw support for vq descriptor mapping vdpa/mlx5: Make iotlb helper functions more generic vdpa/mlx5: Update cvq iotlb mapping on ASID change Si-Wei Liu (3): vdpa: introduce dedicated descriptor group for virtqueue vhost-vdpa: introduce descriptor group backend feature vhost-vdpa: uAPI to get dedicated descriptor group id drivers/vdpa/mlx5/core/mlx5_vdpa.h | 31 +++-- drivers/vdpa/mlx5/core/mr.c | 191 ++++++++++++++++------------- drivers/vdpa/mlx5/core/resources.c | 6 +- drivers/vdpa/mlx5/net/mlx5_vnet.c | 100 ++++++++++----- drivers/vhost/vdpa.c | 27 ++++ include/linux/mlx5/mlx5_ifc.h | 8 +- include/linux/mlx5/mlx5_ifc_vdpa.h | 7 +- include/linux/vdpa.h | 11 ++ include/uapi/linux/vhost.h | 8 ++ include/uapi/linux/vhost_types.h | 5 + 10 files changed, 264 insertions(+), 130 deletions(-) -- 2.41.0
