From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 90D7920ED; Sun, 18 Jan 2026 12:08:59 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768738139; cv=none; b=lDaJSOugUGDSbb271L84PTRNmh9nvmbNMEZVFR3yi8mU0o6EAfoohx2SpLWZHjEvOuFqQzJxVgiZ9chYnAHASCBg/w8DaybEHAO16kxQku6+Bp4YZuVfgzEzGvAw20MpQ62ynEN6prUWZ8PmQb1uLuhuHuxDas5L/+EwYIOjFTE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768738139; c=relaxed/simple; bh=6bmUHSFT3Q7/+tXPCxCaiihzWsFX2kmrdZwwrHRlKhY=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version:Content-Type; b=MsGCw/N+Um7WB9Rl4wloCR2zWEixQjiTUCHSMVBda9xHloyjKMpUEoXOHApMaEa7PKx3Nt3Slb69SHQTYrcuMp+6uxTfHeYLe0t4TnqmeWcZy6QQrmOXkgQs7aHfQHQtpvMUe6nk4l6OY2Z8ViLgFHBBu3qJ/HIWwdP+Dijamag= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=aG4uK31r; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="aG4uK31r" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 92637C116D0; Sun, 18 Jan 2026 12:08:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1768738139; bh=6bmUHSFT3Q7/+tXPCxCaiihzWsFX2kmrdZwwrHRlKhY=; h=From:To:Cc:Subject:Date:From; b=aG4uK31r0MqVjWD9XffPW7en2hhZsO688W532e1q8M7HRFYm320SE5m73+UGstOff 0HrYZuKbh0toNswE4Xbm1P0QHSQKJblqIbIyQy0jq+i0SdliWxS4tc1gq5JCChkVGi Riax/uALSvMxc5oVBHWULvwd01DMvBqLuON9emQT4OVyyB5VdFxK+Ox4k/LswzZTkG Ah6VK2r5SR451CP05ufhWEs0FXamSBFN+a8yO057BxF8fnGNz5hAvSNoSnggXxVhx0 5vL8oOMNUSVxROdcIeYu7DAAiE4l0/WXHLT4AilQNGqLbTAZ2WoezH1KLPDu6Lmimm EDaAW2lmOJo2A== From: Leon Romanovsky To: Sumit Semwal , =?utf-8?q?Christian_K=C3=B6nig?= , Alex Deucher , David Airlie , Simona Vetter , Gerd Hoffmann , Dmitry Osipenko , Gurchetan Singh , Chia-I Wu , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , Lucas De Marchi , =?utf-8?q?Thomas_Hellstr=C3=B6m?= , Rodrigo Vivi , Jason Gunthorpe , Leon Romanovsky , Kevin Tian , Joerg Roedel , Will Deacon , Robin Murphy , Alex Williamson Cc: linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org, linaro-mm-sig@lists.linaro.org, linux-kernel@vger.kernel.org, amd-gfx@lists.freedesktop.org, virtualization@lists.linux.dev, intel-xe@lists.freedesktop.org, linux-rdma@vger.kernel.org, iommu@lists.linux.dev, kvm@vger.kernel.org Subject: [PATCH v2 0/4] dma-buf: document revoke mechanism to invalidate shared buffers Date: Sun, 18 Jan 2026 14:08:44 +0200 Message-ID: <20260118-dmabuf-revoke-v2-0-a03bb27c0875@nvidia.com> X-Mailer: git-send-email 2.52.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" X-Change-ID: 20251221-dmabuf-revoke-b90ef16e4236 X-Mailer: b4 0.15-dev-a6db3 Content-Transfer-Encoding: quoted-printable Changelog:=0D v2:=0D * Changed series to document the revoke semantics instead of=0D implementing it.=0D v1: https://patch.msgid.link/20260111-dmabuf-revoke-v1-0-fb4bcc8c259b@nvidi= a.com=0D =0D -------------------------------------------------------------------------=0D This series documents a dma-buf =E2=80=9Crevoke=E2=80=9D mechanism: to allo= w a dma-buf=0D exporter to explicitly invalidate (=E2=80=9Ckill=E2=80=9D) a shared buffer = after it has=0D been distributed to importers, so that further CPU and device access is=0D prevented and importers reliably observe failure.=0D =0D The change in this series is to properly document and use existing core=0D =E2=80=9Crevoked=E2=80=9D state on the dma-buf object and a corresponding e= xporter-triggered=0D revoke operation. Once a dma-buf is revoked, new access paths are blocked s= o=0D that attempts to DMA-map, vmap, or mmap the buffer fail in a consistent way= .=0D =0D Thanks=0D =0D Cc: linux-media@vger.kernel.org=0D Cc: dri-devel@lists.freedesktop.org=0D Cc: linaro-mm-sig@lists.linaro.org=0D Cc: linux-kernel@vger.kernel.org=0D Cc: amd-gfx@lists.freedesktop.org=0D Cc: virtualization@lists.linux.dev=0D Cc: intel-xe@lists.freedesktop.org=0D Cc: linux-rdma@vger.kernel.org=0D Cc: iommu@lists.linux.dev=0D Cc: kvm@vger.kernel.org=0D To: Sumit Semwal =0D To: Christian K=C3=B6nig =0D To: Alex Deucher =0D To: David Airlie =0D To: Simona Vetter =0D To: Gerd Hoffmann =0D To: Dmitry Osipenko =0D To: Gurchetan Singh =0D To: Chia-I Wu =0D To: Maarten Lankhorst =0D To: Maxime Ripard =0D To: Thomas Zimmermann =0D To: Lucas De Marchi =0D To: Thomas Hellstr=C3=B6m =0D To: Rodrigo Vivi =0D To: Jason Gunthorpe =0D To: Leon Romanovsky =0D To: Kevin Tian =0D To: Joerg Roedel =0D To: Will Deacon =0D To: Robin Murphy =0D To: Alex Williamson =0D =0D ---=0D Leon Romanovsky (4):=0D dma-buf: Rename .move_notify() callback to a clearer identifier=0D dma-buf: Document revoke semantics=0D iommufd: Require DMABUF revoke semantics=0D vfio: Add pinned interface to perform revoke semantics=0D =0D drivers/dma-buf/dma-buf.c | 6 +++---=0D drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c | 4 ++--=0D drivers/gpu/drm/virtio/virtgpu_prime.c | 2 +-=0D drivers/gpu/drm/xe/tests/xe_dma_buf.c | 6 +++---=0D drivers/gpu/drm/xe/xe_dma_buf.c | 2 +-=0D drivers/infiniband/core/umem_dmabuf.c | 4 ++--=0D drivers/infiniband/hw/mlx5/mr.c | 2 +-=0D drivers/iommu/iommufd/pages.c | 11 +++++++++--=0D drivers/vfio/pci/vfio_pci_dmabuf.c | 16 ++++++++++++++++=0D include/linux/dma-buf.h | 25 ++++++++++++++++++++++---= =0D 10 files changed, 60 insertions(+), 18 deletions(-)=0D ---=0D base-commit: 9ace4753a5202b02191d54e9fdf7f9e3d02b85eb=0D change-id: 20251221-dmabuf-revoke-b90ef16e4236=0D =0D Best regards,=0D -- =0D Leon Romanovsky =0D =0D