linux-kernel - Re: [PATCH v7 7/8] vfio: Permit VFIO to work with pinned importers

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Message-ID: <f27ad57b-d935-4ffa-a65c-9f6b5d9a1f9a@amd.com>
Date: Thu, 5 Feb 2026 15:28:37 +0100
From: Christian König <christian.koenig@....com>
To: Jason Gunthorpe <jgg@...pe.ca>, Leon Romanovsky <leon@...nel.org>
Cc: Alex Williamson <alex@...zbot.org>, Simona Vetter <simona@...ll.ch>,
 Jani Nikula <jani.nikula@...el.com>,
 Lucas De Marchi <lucas.demarchi@...el.com>,
 Sumit Semwal <sumit.semwal@...aro.org>,
 Alex Deucher <alexander.deucher@....com>, David Airlie <airlied@...il.com>,
 Gerd Hoffmann <kraxel@...hat.com>,
 Dmitry Osipenko <dmitry.osipenko@...labora.com>,
 Gurchetan Singh <gurchetansingh@...omium.org>, Chia-I Wu
 <olvaffe@...il.com>, Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
 Thomas Hellström <thomas.hellstrom@...ux.intel.com>,
 Rodrigo Vivi <rodrigo.vivi@...el.com>, Kevin Tian <kevin.tian@...el.com>,
 Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
 Robin Murphy <robin.murphy@....com>, Felix Kuehling
 <Felix.Kuehling@....com>, Ankit Agrawal <ankita@...dia.com>,
 Vivek Kasireddy <vivek.kasireddy@...el.com>, linux-media@...r.kernel.org,
 dri-devel@...ts.freedesktop.org, linaro-mm-sig@...ts.linaro.org,
 linux-kernel@...r.kernel.org, amd-gfx@...ts.freedesktop.org,
 virtualization@...ts.linux.dev, intel-xe@...ts.freedesktop.org,
 linux-rdma@...r.kernel.org, iommu@...ts.linux.dev, kvm@...r.kernel.org
Subject: Re: [PATCH v7 7/8] vfio: Permit VFIO to work with pinned importers

On 2/5/26 15:21, Jason Gunthorpe wrote:
> On Thu, Feb 05, 2026 at 02:19:45PM +0200, Leon Romanovsky wrote:
>> You don't need any backmerge, SHA-1 version of vfio-v6.19-rc8 tag is the
>> same as in Linus's tree, so the flow is:
> 
> I'm confused what is the problem here?
> 
> From https://anongit.freedesktop.org/git/drm/drm-misc
>  * branch                          drm-misc-next -> FETCH_HEAD
> 
> $ git show FETCH_HEAD
> commit 779ec12c85c9e4547519e3903a371a3b26a289de
> Author: Alexander Konyukhov <Alexander.Konyukhov@...persky.com>
> Date:   Tue Feb 3 16:48:46 2026 +0300
> 
>     drm/komeda: fix integer overflow in AFBC framebuffer size check
> 
> $ git merge-base  FETCH_HEAD 61ceaf236115f20f4fdd7cf60f883ada1063349a
> 24d479d26b25bce5faea3ddd9fa8f3a6c3129ea7
> $ git describe --contains 24d479d26b25bce5faea3ddd9fa8f3a6c3129ea7
> v6.19-rc6^0
> 
> $ git log --oneline 61ceaf236115f20f4fdd7cf60f883ada1063349a ^FETCH_HEAD
> 61ceaf236115f2 vfio: Prevent from pinned DMABUF importers to attach to VFIO DMABUF
> 
> Just pull Alex's tree, the drm-misc-next tree already has v6.19-rc6,
> so all they will see is one extra patch from Alex in your PR.
> 
> No need to backmerge, this is normal git stuff and there won't be
> conflicts when they merge a later Linus tag.

Correct, but that would merge the same patch through two different trees. That is usually a pretty big no-go.

Christian.

> 
> Jason