linux-kernel - Re: [PATCH v6 00/11] vfio/pci: Allow MMIO regions to be exported through dma-buf

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Message-ID: <20251104070021.GC50752@unreal>
Date: Tue, 4 Nov 2025 09:00:21 +0200
From: Leon Romanovsky <leon@...nel.org>
To: Bjorn Helgaas <bhelgaas@...gle.com>,
	Logan Gunthorpe <logang@...tatee.com>,
	Sumit Semwal <sumit.semwal@...aro.org>,
	Christian König <christian.koenig@....com>,
	Jens Axboe <axboe@...nel.dk>, Robin Murphy <robin.murphy@....com>,
	Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Jason Gunthorpe <jgg@...pe.ca>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jonathan Corbet <corbet@....net>,
	Alex Williamson <alex.williamson@...hat.com>,
	Kees Cook <kees@...nel.org>,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>,
	Ankit Agrawal <ankita@...dia.com>,
	Yishai Hadas <yishaih@...dia.com>,
	Shameer Kolothum <skolothumtho@...dia.com>,
	Kevin Tian <kevin.tian@...el.com>
Cc: Krishnakant Jaju <kjaju@...dia.com>, Matt Ochs <mochs@...dia.com>,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-block@...r.kernel.org, iommu@...ts.linux.dev,
	linux-mm@...ck.org, linux-doc@...r.kernel.org,
	linux-media@...r.kernel.org, dri-devel@...ts.freedesktop.org,
	linaro-mm-sig@...ts.linaro.org, kvm@...r.kernel.org,
	linux-hardening@...r.kernel.org,
	Vivek Kasireddy <vivek.kasireddy@...el.com>
Subject: Re: [PATCH v6 00/11] vfio/pci: Allow MMIO regions to be exported
 through dma-buf

On Sun, Nov 02, 2025 at 10:00:48AM +0200, Leon Romanovsky wrote:

<...>

> ---
> Jason Gunthorpe (2):
>       PCI/P2PDMA: Document DMABUF model
>       vfio/nvgrace: Support get_dmabuf_phys
> 
> Leon Romanovsky (7):
>       PCI/P2PDMA: Separate the mmap() support from the core logic
>       PCI/P2PDMA: Simplify bus address mapping API
>       PCI/P2PDMA: Refactor to separate core P2P functionality from memory allocation
>       PCI/P2PDMA: Provide an access to pci_p2pdma_map_type() function
>       dma-buf: provide phys_vec to scatter-gather mapping routine
>       vfio/pci: Enable peer-to-peer DMA transactions by default
>       vfio/pci: Add dma-buf export support for MMIO regions
> 
> Vivek Kasireddy (2):
>       vfio: Export vfio device get and put registration helpers
>       vfio/pci: Share the core device pointer while invoking feature functions


Hi,

Can we get Acked-by for p2pdma and DMABUF parts?

Thanks

> 
>  Documentation/driver-api/pci/p2pdma.rst |  95 +++++++---
>  block/blk-mq-dma.c                      |   2 +-
>  drivers/dma-buf/dma-buf.c               | 235 ++++++++++++++++++++++++
>  drivers/iommu/dma-iommu.c               |   4 +-
>  drivers/pci/p2pdma.c                    | 182 +++++++++++++-----
>  drivers/vfio/pci/Kconfig                |   3 +
>  drivers/vfio/pci/Makefile               |   1 +
>  drivers/vfio/pci/nvgrace-gpu/main.c     |  56 ++++++
>  drivers/vfio/pci/vfio_pci.c             |   5 +
>  drivers/vfio/pci/vfio_pci_config.c      |  22 ++-
>  drivers/vfio/pci/vfio_pci_core.c        |  56 ++++--
>  drivers/vfio/pci/vfio_pci_dmabuf.c      | 315 ++++++++++++++++++++++++++++++++
>  drivers/vfio/pci/vfio_pci_priv.h        |  23 +++
>  drivers/vfio/vfio_main.c                |   2 +
>  include/linux/dma-buf.h                 |  18 ++
>  include/linux/pci-p2pdma.h              | 120 +++++++-----
>  include/linux/vfio.h                    |   2 +
>  include/linux/vfio_pci_core.h           |  42 +++++
>  include/uapi/linux/vfio.h               |  27 +++
>  kernel/dma/direct.c                     |   4 +-
>  mm/hmm.c                                |   2 +-
>  21 files changed, 1077 insertions(+), 139 deletions(-)
> ---
> base-commit: 3a8660878839faadb4f1a6dd72c3179c1df56787
> change-id: 20251016-dmabuf-vfio-6cef732adf5a
> 
> Best regards,
> --  
> Leon Romanovsky <leonro@...dia.com>
> 
>