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

[Eric Farman <farman@linux.ibm.com>]

On Tue, 2022-07-05 at 23:27 -0700, Nicolin Chen wrote:
> 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.

Tested-by: Eric Farman <farman@linux.ibm.com>	# s390

> 
> 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(-)
>