linux-kernel - Re: [PATCH 0/4] dma-buf: add revoke mechanism to invalidate shared buffers

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Message-ID: <20260112144716.GA179508@unreal>
Date: Mon, 12 Jan 2026 16:47:16 +0200
From: Leon Romanovsky <leon@...nel.org>
To: Jason Gunthorpe <jgg@...pe.ca>
Cc: Christian König <christian.koenig@....com>,
	Simona Vetter <simona.vetter@...ll.ch>,
	Sumit Semwal <sumit.semwal@...aro.org>,
	Alex Williamson <alex@...zbot.org>,
	Kevin Tian <kevin.tian@...el.com>, Joerg Roedel <joro@...tes.org>,
	Will Deacon <will@...nel.org>, Robin Murphy <robin.murphy@....com>,
	linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-media@...r.kernel.org, dri-devel@...ts.freedesktop.org,
	linaro-mm-sig@...ts.linaro.org, kvm@...r.kernel.org,
	iommu@...ts.linux.dev
Subject: Re: [PATCH 0/4] dma-buf: add revoke mechanism to invalidate shared
 buffers

On Mon, Jan 12, 2026 at 10:14:40AM -0400, Jason Gunthorpe wrote:
> On Mon, Jan 12, 2026 at 01:57:25PM +0100, Christian König wrote:
> > Clear NAK to that plan. This is not something DMA-buf should need to
> > deal with and as far as I can see is incompatible with the UAPI.
> 
> We had this discussion with Simona and you a while back and there was
> a pretty clear direction we needed to add a revoke to sit inbetween
> pin and move. I think Leon has no quite got the "dmabuf lingo" down
> right to explain this.
> 
>  https://lore.kernel.org/dri-devel/Z4Z4NKqVG2Vbv98Q@phenom.ffwll.local/

<...>

> It is not intended to be UAPI changing, and Leon is not trying to say
> that importers have to drop their attachment. The attachment just
> becomes permanently non-present.

Leon also ensures that no UAPI semantic changes are introduced here; the
existing interface is simply extended.

Thanks

> 
> Jason