[PATCH v4 00/10] cover-letter: Update vfio_pin/unpin_pages API

[Xu, Terrence]

> -----Original Message-----
> From: intel-gvt-dev <intel-gvt-dev-bounces at lists.freedesktop.org> On
> Behalf Of 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-v4
> 
> Terrence has tested this series on i915; Eric has tested on s390.
> 
> Thanks!
> 
> Changelog
> v4:
>  * Dropped double-shifting at two gvt_unpin_guest_page calls, fixing
>    a bug that's discovered by Alex
>  * Added Reviewed-by from Anthony Krowiak
>  * Rebased on top of linux-vfio's next
> v3: https://lore.kernel.org/kvm/20220708224427.1245-1-
> nicolinc at nvidia.com/
>  * Added a patch to replace roundup with DIV_ROUND_UP in i915 gvt
>  * Dropped the "driver->ops->unpin_pages" and NULL checks in PATCH-1
>  * Changed to use WARN_ON and separate into lines in PATCH-1
>  * Replaced "guest" words with "user" and fix typo in PATCH-5
>  * Updated commit log of PATCH-1, PATCH-6, and PATCH-10
>  * Added Reviewed/Acked-by from Christoph, Jason, Kirti, Kevin and Eric
>  * Added Tested-by from Terrence (i915) and Eric (s390)
> v2: https://lore.kernel.org/kvm/20220706062759.24946-1-
> nicolinc at nvidia.com/
>  * 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 at nvidia.com/
> 
> Nicolin Chen (10):
>   vfio: Make vfio_unpin_pages() return void
>   drm/i915/gvt: Replace roundup with DIV_ROUND_UP
>   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: Change saved_pfn to saved_iova
>   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              |  45 ++--
>  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                           |  54 ++---
>  drivers/vfio/vfio.h                           |   8 +-
>  drivers/vfio/vfio_iommu_type1.c               |  45 ++--
>  include/linux/vfio.h                          |   9 +-
>  11 files changed, 213 insertions(+), 215 deletions(-)

Verified the Intel KVMGT feature, no regression be introduced by v4 patch series, the previous Call Trace issue already gone.
Tested-by: Terrence Xu <terrence.xu at intel.com>
> --
> 2.17.1