linux-kernel - Re: [PATCH v5 9/9] vfio/pci: Add dma-buf export support for MMIO regions

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Message-ID: <aQPmlwaoqPPFeyN/@devgpu015.cco6.facebook.com>
Date: Thu, 30 Oct 2025 15:28:39 -0700
From: Alex Mastro <amastro@...com>
To: Leon Romanovsky <leon@...nel.org>
CC: David Matlack <dmatlack@...gle.com>,
        Alex Williamson
	<alex.williamson@...hat.com>,
        Jason Gunthorpe <jgg@...dia.com>,
        Andrew Morton
	<akpm@...ux-foundation.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Christian
 König <christian.koenig@....com>,
        <dri-devel@...ts.freedesktop.org>, <iommu@...ts.linux.dev>,
        Jens Axboe
	<axboe@...nel.dk>, Joerg Roedel <joro@...tes.org>,
        <kvm@...r.kernel.org>, <linaro-mm-sig@...ts.linaro.org>,
        <linux-block@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-media@...r.kernel.org>, <linux-mm@...ck.org>,
        <linux-pci@...r.kernel.org>, Logan Gunthorpe
	<logang@...tatee.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Robin
 Murphy <robin.murphy@....com>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Vivek
 Kasireddy <vivek.kasireddy@...el.com>,
        Will Deacon <will@...nel.org>
Subject: Re: [PATCH v5 9/9] vfio/pci: Add dma-buf export support for MMIO
 regions

> On Mon, Oct 27, 2025 at 04:13:05PM -0700, David Matlack wrote:
> > On Mon, Oct 13, 2025 at 8:44 AM Leon Romanovsky <leon@...nel.org> wrote:
> > This uAPI would be a good candidate for a VFIO selftest. You can test
> > that it returns an error when it's supposed to, and a valid fd when
> > it's supposed to. And once the iommufd importer side is ready, we can
> > extend the test and verify that the fd can be mapped into iommufd.
> 
> No problem, I'll add such test, but let's focus on making sure that this
> series is accepted first.

Along similar lines, perhaps adding vfio as src/vfio_memory.c dmabuf provider
to perftest [1] could be useful for low-level end-to-end validation.

https://github.com/linux-rdma/perftest