linux-kernel - RE: [PATCH v5 7/8] vfio: Permit VFIO to work with pinned importers

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Message-ID: <BN9PR11MB527671BA155807D44E58CB608C9FA@BN9PR11MB5276.namprd11.prod.outlook.com>
Date: Fri, 30 Jan 2026 03:14:11 +0000
From: "Tian, Kevin" <kevin.tian@...el.com>
To: Leon Romanovsky <leon@...nel.org>, 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>, "Vivi, Rodrigo" <rodrigo.vivi@...el.com>,
	Jason Gunthorpe <jgg@...pe.ca>, 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>, "Kasireddy, Vivek" <vivek.kasireddy@...el.com>
CC: "linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
	"linaro-mm-sig@...ts.linaro.org" <linaro-mm-sig@...ts.linaro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"amd-gfx@...ts.freedesktop.org" <amd-gfx@...ts.freedesktop.org>,
	"virtualization@...ts.linux.dev" <virtualization@...ts.linux.dev>,
	"intel-xe@...ts.freedesktop.org" <intel-xe@...ts.freedesktop.org>,
	"linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
	"iommu@...ts.linux.dev" <iommu@...ts.linux.dev>, "kvm@...r.kernel.org"
	<kvm@...r.kernel.org>
Subject: RE: [PATCH v5 7/8] vfio: Permit VFIO to work with pinned importers

> From: Leon Romanovsky <leon@...nel.org>
> Sent: Sunday, January 25, 2026 3:14 AM
> 
> From: Leon Romanovsky <leonro@...dia.com>
> 
> Till now VFIO has rejected pinned importers, largely to avoid being used
> with the RDMA pinned importer that cannot handle a move_notify() to
> revoke
> access.
> 
> Using dma_buf_attach_revocable() it can tell the difference between pinned
> importers that support the flow described in dma_buf_invalidate_mappings()
> and those that don't.
> 
> Thus permit compatible pinned importers.
> 
> This is one of two items IOMMUFD requires to remove its private interface
> to VFIO's dma-buf.
> 
> Signed-off-by: Leon Romanovsky <leonro@...dia.com>

Reviewed-by: Kevin Tian <kevin.tian@...el.com>