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

Nicolin Chen
2022-07-06T06:28:17Z

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@nvidia.com/

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