linux-kernel - Re: [PATCH v5 8/8] iommufd: Add dma_buf

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Message-ID: <20260130001710.GB2328995@ziepe.ca>
Date: Thu, 29 Jan 2026 20:17:10 -0400
From: Jason Gunthorpe <jgg@...pe.ca>
To: Leon Romanovsky <leon@...nel.org>
Cc: Sumit Semwal <sumit.semwal@...aro.org>,
	Christian König <christian.koenig@....com>,
	Alex Deucher <alexander.deucher@....com>,
	David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
	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>,
	Lucas De Marchi <lucas.demarchi@...el.com>,
	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>,
	Alex Williamson <alex@...zbot.org>,
	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 v5 8/8] iommufd: Add dma_buf_pin()

On Sat, Jan 24, 2026 at 09:14:20PM +0200, Leon Romanovsky wrote:
> From: Leon Romanovsky <leonro@...dia.com>
> 
> IOMMUFD relies on a private protocol with VFIO, and this always operated
> in pinned mode.
> 
> Now that VFIO can support pinned importers update IOMMUFD to invoke the
> normal dma-buf flow to request pin.
> 
> This isn't enough to allow IOMMUFD to work with other exporters, it still
> needs a way to get the physical address list which is another series.
> 
> IOMMUFD supports the defined revoke semantics. It immediately stops and
> fences access to the memory inside it's invalidate_mappings() callback,
> and it currently doesn't use scatterlists so doesn't call map/unmap at
> all.
> 
> It is expected that a future revision can synchronously call unmap from
> the move_notify callback as well.
> 
> Acked-by: Christian König <christian.koenig@....com>
> Signed-off-by: Leon Romanovsky <leonro@...dia.com>
> ---
>  drivers/iommu/iommufd/pages.c | 9 ++++++++-
>  1 file changed, 8 insertions(+), 1 deletion(-)

Reviewed-by: Jason Gunthorpe <jgg@...dia.com>

Jason