linux-kernel - Re: [PATCH v7 10/11] vfio/pci: Add dma-buf export support for MMIO regions

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Message-ID: <20251110130525.6712552b.alex@shazbot.org>
Date: Mon, 10 Nov 2025 13:05:25 -0700
From: Alex Williamson <alex@...zbot.org>
To: Leon Romanovsky <leon@...nel.org>
Cc: Bjorn Helgaas <bhelgaas@...gle.com>,
 Logan Gunthorpe <logang@...tatee.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>, Sumit Semwal <sumit.semwal@...aro.org>,
 Christian König <christian.koenig@....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>, 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 v7 10/11] vfio/pci: Add dma-buf export support for MMIO
 regions

On Thu,  6 Nov 2025 16:16:55 +0200
Leon Romanovsky <leon@...nel.org> wrote:
> diff --git a/drivers/vfio/pci/vfio_pci_dmabuf.c b/drivers/vfio/pci/vfio_pci_dmabuf.c
> new file mode 100644
> index 000000000000..cbf502b14e3c
> --- /dev/null
> +++ b/drivers/vfio/pci/vfio_pci_dmabuf.c
...
> +
> +int vfio_pci_core_feature_dma_buf(struct vfio_pci_core_device *vdev, u32 flags,
> +				  struct vfio_device_feature_dma_buf __user *arg,
> +				  size_t argsz)
> +{
> +	struct vfio_device_feature_dma_buf get_dma_buf = {};
> +	struct vfio_region_dma_range *dma_ranges;
> +	DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
> +	struct vfio_pci_dma_buf *priv;
> +	size_t length;
> +	int ret;
> +
> +	if (!vdev->pci_ops->get_dmabuf_phys)

vdev->pci_ops can be NULL.

Thanks,
Alex