[RFT][PATCH v2 0/9] Update vfio_pin/unpin_pages API

[Nicolin Chen]

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!

Changelog
v2:
 * Added a patch to make vfio_unpin_pages return void
 * Added two patches to remove PFN list from two s390 callers
 * Renamed "phys_page" parameter to "pages" for vfio_pin_pages
 * Updated commit log of kmap_local_page() patch
 * Added Harald's "Reviewed-by" to pa_ind patch
 * Rebased on top of Alex's extern removal path
v1: https://lore.kernel.org/kvm/20220616235212.15185-1-nicolinc@xxxxxxxxxx/

Nicolin Chen (9):
  vfio: Make vfio_unpin_pages() return void
  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/ap: Remove redundant pfn
  vfio/ccw: Change pa_pfn list to pa_iova list
  vfio: Rename user_iova of vfio_dma_rw()
  vfio/ccw: Add kmap_local_page() for memcpy
  vfio: Replace phys_pfn with pages 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              |  46 ++---
 drivers/s390/cio/vfio_ccw_cp.c                | 195 +++++++++++-------
 drivers/s390/crypto/ap_queue.c                |   2 +-
 drivers/s390/crypto/vfio_ap_ops.c             |  54 +++--
 drivers/s390/crypto/vfio_ap_private.h         |   4 +-
 drivers/vfio/vfio.c                           |  55 +++--
 drivers/vfio/vfio.h                           |   8 +-
 drivers/vfio/vfio_iommu_type1.c               |  46 +++--
 include/linux/vfio.h                          |   9 +-
 11 files changed, 218 insertions(+), 213 deletions(-)

-- 
2.17.1