linux-kernel - [RFT][PATCH v1 0/6] Update vfio_pin/unpin

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Message-ID: <20220616235212.15185-1-nicolinc@nvidia.com>
Date:   Thu, 16 Jun 2022 16:52:06 -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>
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>
Subject: [RFT][PATCH v1 0/6] 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

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!

Nicolin Chen (6):
  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: Rename user_iova of vfio_dma_rw()
  vfio/ccw: Add kmap_local_page() for memcpy
  vfio: Replace phys_pfn with phys_page 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              | 44 ++++-----
 drivers/s390/cio/vfio_ccw_cp.c                | 90 ++++++++++++++-----
 drivers/s390/crypto/ap_queue.c                |  2 +-
 drivers/s390/crypto/vfio_ap_ops.c             | 21 ++---
 drivers/vfio/vfio.c                           | 38 ++++----
 drivers/vfio/vfio.h                           |  6 +-
 drivers/vfio/vfio_iommu_type1.c               | 34 +++----
 include/linux/vfio.h                          |  8 +-
 10 files changed, 142 insertions(+), 113 deletions(-)

-- 
2.17.1