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Date: Mon, 25 Jul 2022 10:20:42 +0000
From: "Xu, Terrence" <terrence.xu@...el.com>
To: Nicolin Chen <nicolinc@...dia.com>,
"kwankhede@...dia.com" <kwankhede@...dia.com>,
"corbet@....net" <corbet@....net>,
"hca@...ux.ibm.com" <hca@...ux.ibm.com>,
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"Wang, Zhi A" <zhi.a.wang@...el.com>,
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"joonas.lahtinen@...ux.intel.com" <joonas.lahtinen@...ux.intel.com>,
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CC: "linux-s390@...r.kernel.org" <linux-s390@...r.kernel.org>,
"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
"intel-gfx@...ts.freedesktop.org" <intel-gfx@...ts.freedesktop.org>,
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"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
"intel-gvt-dev@...ts.freedesktop.org"
<intel-gvt-dev@...ts.freedesktop.org>
Subject: RE: [PATCH v4 00/10] cover-letter: Update vfio_pin/unpin_pages API
> -----Original Message-----
> From: intel-gvt-dev <intel-gvt-dev-bounces@...ts.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@...dia.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@...dia.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@...dia.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@...el.com>
> --
> 2.17.1
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