This is a preparatory series for IOMMUFD v2 patches. It prepares for replacing vfio_iommu_type1 implementations of vfio_pin/unpin_pages() with IOMMUFD version.
There's a gap between these two versions: the vfio_iommu_type1 version inputs a non-contiguous PFN list and outputs another PFN list for the pinned physical page list, while the IOMMUFD version only supports a contiguous address input by accepting the starting IO virtual address of a set of pages to pin and by outputting to a physical page list.
The nature of existing callers mostly aligns with the IOMMUFD version, except s390's vfio_ccw_cp code where some additional change is needed along with this series. Overall, updating to "iova" and "phys_page" does improve the caller side to some extent.
Also fix a misuse of physical address and virtual address in the s390's crypto code. And update the input naming at the adjacent vfio_dma_rw().
This is on github: https://github.com/nicolinc/iommufd/commits/vfio_pin_pages
Request for testing: I only did build for s390 and i915 code, so it'd be nice to have people who have environment to run sanity accordingly.
Thanks!
Nicolin Chen (6): vfio/ap: Pass in physical address of ind to ap_aqic() vfio/ccw: Only pass in contiguous pages vfio: Pass in starting IOVA to vfio_pin/unpin_pages API vfio: Rename user_iova of vfio_dma_rw() vfio/ccw: Add kmap_local_page() for memcpy vfio: Replace phys_pfn with phys_page for vfio_pin_pages()
.../driver-api/vfio-mediated-device.rst | 6 +- arch/s390/include/asm/ap.h | 6 +- drivers/gpu/drm/i915/gvt/kvmgt.c | 44 ++++----- drivers/s390/cio/vfio_ccw_cp.c | 90 ++++++++++++++----- drivers/s390/crypto/ap_queue.c | 2 +- drivers/s390/crypto/vfio_ap_ops.c | 21 ++--- drivers/vfio/vfio.c | 38 ++++---- drivers/vfio/vfio.h | 6 +- drivers/vfio/vfio_iommu_type1.c | 34 +++---- include/linux/vfio.h | 8 +- 10 files changed, 142 insertions(+), 113 deletions(-)