linux-kernel - [PATCH v3 00/10] Update vfio_pin/unpin

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Date:   Fri, 8 Jul 2022 15:44:18 -0700
From:   Nicolin Chen <nicolinc@...dia.com>
To:     <kwankhede@...dia.com>, <corbet@....net>, <hca@...ux.ibm.com>,
        <gor@...ux.ibm.com>, <agordeev@...ux.ibm.com>,
        <borntraeger@...ux.ibm.com>, <svens@...ux.ibm.com>,
        <zhenyuw@...ux.intel.com>, <zhi.a.wang@...el.com>,
        <jani.nikula@...ux.intel.com>, <joonas.lahtinen@...ux.intel.com>,
        <rodrigo.vivi@...el.com>, <tvrtko.ursulin@...ux.intel.com>,
        <airlied@...ux.ie>, <daniel@...ll.ch>, <farman@...ux.ibm.com>,
        <mjrosato@...ux.ibm.com>, <pasic@...ux.ibm.com>,
        <vneethv@...ux.ibm.com>, <oberpar@...ux.ibm.com>,
        <freude@...ux.ibm.com>, <akrowiak@...ux.ibm.com>,
        <jjherne@...ux.ibm.com>, <alex.williamson@...hat.com>,
        <cohuck@...hat.com>, <jgg@...dia.com>, <kevin.tian@...el.com>,
        <hch@...radead.org>
CC:     <jchrist@...ux.ibm.com>, <kvm@...r.kernel.org>,
        <linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-s390@...r.kernel.org>,
        <intel-gvt-dev@...ts.freedesktop.org>,
        <intel-gfx@...ts.freedesktop.org>,
        <dri-devel@...ts.freedesktop.org>, <terrence.xu@...el.com>
Subject: [PATCH v3 00/10] Update vfio_pin/unpin_pages API

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

Terrence has tested this series on i915; Eric has tested on s390.

Thanks!

Changelog
v3:
 * 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@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@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              |  49 ++---
 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, 215 insertions(+), 217 deletions(-)

-- 
2.17.1