From: Leon Romanovsky <leon@kernel.org>
To: Jason Gunthorpe <jgg@ziepe.ca>
Cc: "Christian König" <christian.koenig@amd.com>,
"Simona Vetter" <simona.vetter@ffwll.ch>,
"Sumit Semwal" <sumit.semwal@linaro.org>,
"Alex Williamson" <alex@shazbot.org>,
"Kevin Tian" <kevin.tian@intel.com>,
"Joerg Roedel" <joro@8bytes.org>, "Will Deacon" <will@kernel.org>,
"Robin Murphy" <robin.murphy@arm.com>,
linux-rdma@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org,
linaro-mm-sig@lists.linaro.org, kvm@vger.kernel.org,
iommu@lists.linux.dev
Subject: Re: [PATCH 0/4] dma-buf: add revoke mechanism to invalidate shared buffers
Date: Mon, 12 Jan 2026 16:47:16 +0200 [thread overview]
Message-ID: <20260112144716.GA179508@unreal> (raw)
In-Reply-To: <20260112141440.GE745888@ziepe.ca>
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
next prev parent reply other threads:[~2026-01-12 14:47 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-01-11 10:37 [PATCH 0/4] dma-buf: add revoke mechanism to invalidate shared buffers Leon Romanovsky
2026-01-11 10:37 ` [PATCH 1/4] dma-buf: Introduce revoke semantics Leon Romanovsky
2026-01-11 10:37 ` [PATCH 2/4] vfio: Use dma-buf " Leon Romanovsky
2026-01-11 10:37 ` [PATCH 3/4] iommufd: Require DMABUF " Leon Romanovsky
2026-01-11 10:37 ` [PATCH 4/4] iommufd/selftest: Reuse dma-buf " Leon Romanovsky
2026-01-12 10:04 ` [PATCH 0/4] dma-buf: add revoke mechanism to invalidate shared buffers Christian König
2026-01-12 12:19 ` Leon Romanovsky
2026-01-12 12:57 ` Christian König
2026-01-12 14:14 ` Jason Gunthorpe
2026-01-12 14:47 ` Leon Romanovsky [this message]
2026-01-12 14:56 ` Christian König
2026-01-12 15:35 ` Jason Gunthorpe
2026-01-12 16:12 ` Christian König
2026-01-12 17:04 ` Jason Gunthorpe
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