From: sashiko-bot@kernel.org
To: "Matt Evans" <matt@ozlabs.org>
Cc: dri-devel@lists.freedesktop.org, linux-pci@vger.kernel.org,
media-ci@linuxtv.org, kvm@vger.kernel.org
Subject: Re: [PATCH v8 5/9] vfio/pci: Add a helper to create a DMABUF for a BAR-map VMA
Date: Tue, 06 Oct 2026 19:53:17 +0000 [thread overview]
Message-ID: <sashiko-outbox-162413@kernel.org> (raw)
In-Reply-To: <20261006193643.76330-6-matt@ozlabs.org>
> This helper, vfio_pci_core_mmap_prep_dmabuf(), creates a single-range
> DMABUF for the purpose of mapping a PCI BAR. This is used in a future
> commit by VFIO's ordinary mmap() path.
>
> This function transfers ownership of the VFIO device fd to the
> DMABUF, which fput()s when it's released.
>
> Refactor the existing vfio_pci_core_feature_dma_buf() to split out
> export code common to the two paths, VFIO_DEVICE_FEATURE_DMA_BUF and
> this new VFIO_BAR mmap().
>
> By exchanging the VMA file, we lose the original device path in
> /proc/<pid>/maps, lsof, etc. Generate a debug-oriented synthetic
> 'filename' for BAR mappings based on the BDF, plus resource index.
> (This does not apply to explicitly-exported DMABUFs which are named by
> DMA_BUF_SET_NAME.)
>
> Signed-off-by: Matt Evans <matt@ozlabs.org>
Sashiko has reviewed this patch and found no issues. It looks great!
--
Sashiko AI review · https://sashiko.dev/#/patchset/20261006193643.76330-1-matt@ozlabs.org?part=5
next prev parent reply other threads:[~2026-10-06 19:53 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-06 19:36 [PATCH v8 0/9] vfio/pci: Add mmap() for DMABUFs Matt Evans
2026-10-06 19:36 ` [PATCH v8 1/9] vfio/pci: Remove DMABUF export dependency on vdev->memory_lock Matt Evans
2026-10-06 19:48 ` sashiko-bot
2026-10-06 19:36 ` [PATCH v8 2/9] vfio/pci: Un-revoke DMABUFs in LOW_POWER_ENTRY_WITH_WAKEUP resume Matt Evans
2026-10-06 19:45 ` sashiko-bot
2026-10-06 19:36 ` [PATCH v8 3/9] dma-buf: Provide dma_buf_set_name() Matt Evans
2026-10-06 19:45 ` sashiko-bot
2026-10-07 9:22 ` Christian König
2026-10-12 6:27 ` Leon Romanovsky
2026-10-06 19:36 ` [PATCH v8 4/9] vfio/pci: Add a helper to look up PFNs for DMABUFs Matt Evans
2026-10-06 19:48 ` sashiko-bot
2026-10-06 19:36 ` [PATCH v8 5/9] vfio/pci: Add a helper to create a DMABUF for a BAR-map VMA Matt Evans
2026-10-06 19:53 ` sashiko-bot [this message]
2026-10-06 19:36 ` [PATCH v8 6/9] vfio/pci: Convert BAR mmap() to use a DMABUF Matt Evans
2026-10-06 19:55 ` sashiko-bot
2026-10-06 19:36 ` [PATCH v8 7/9] vfio/pci: Clean up BAR zap and revocation Matt Evans
2026-10-06 19:54 ` sashiko-bot
2026-10-06 19:36 ` [PATCH v8 8/9] vfio/pci: Support mmap() of a VFIO DMABUF Matt Evans
2026-10-06 19:54 ` sashiko-bot
2026-10-06 19:36 ` [PATCH v8 9/9] vfio/pci: Revoke a DMABUF on request from userspace Matt Evans
2026-10-06 19:45 ` sashiko-bot
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