linux-kernel - Re: [PATCH v4 8/8] vfio: Validate dma-buf revocation semantics

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Message-ID: <20260121155000.GE961572@ziepe.ca>
Date: Wed, 21 Jan 2026 11:50:00 -0400
From: Jason Gunthorpe <jgg@...pe.ca>
To: Pranjal Shrivastava <praan@...gle.com>
Cc: 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>,
	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,
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Subject: Re: [PATCH v4 8/8] vfio: Validate dma-buf revocation semantics

On Wed, Jan 21, 2026 at 02:47:29PM +0000, Pranjal Shrivastava wrote:
> But at the same time, I'd like to discuss if we should think about
> changing the dmabuf core, NULL op == success feels like relying on a bug

Agree, IMHO, it is surprising and counter intuitive in the kernel that
a NULL op means the feature is supported and default to success.

Jason