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[35.187.245.222]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-3591342f19fsm421683a91.10.2026.02.25.00.03.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 25 Feb 2026 00:03:28 -0800 (PST) Date: Wed, 25 Feb 2026 08:03:18 +0000 From: Pranjal Shrivastava To: David Matlack Cc: Alex Williamson , Adithya Jayachandran , Alexander Graf , Alex Mastro , Alistair Popple , Andrew Morton , Ankit Agrawal , Bjorn Helgaas , Chris Li , David Rientjes , Jacob Pan , Jason Gunthorpe , Jason Gunthorpe , Jonathan Corbet , Josh Hilke , Kevin Tian , kexec@lists.infradead.org, kvm@vger.kernel.org, Leon Romanovsky , Leon Romanovsky , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-mm@kvack.org, linux-pci@vger.kernel.org, Lukas Wunner , =?utf-8?Q?Micha=C5=82?= Winiarski , Mike Rapoport , Parav Pandit , Pasha Tatashin , Pratyush Yadav , Raghavendra Rao Ananta , Rodrigo Vivi , Saeed Mahameed , Samiullah Khawaja , Shuah Khan , Thomas =?iso-8859-1?Q?Hellstr=F6m?= , Tomita Moeko , Vipin Sharma , Vivek Kasireddy , William Tu , Yi Liu , Zhu Yanjun Subject: Re: [PATCH v2 08/22] vfio: Enforce preserved devices are retrieved via LIVEUPDATE_SESSION_RETRIEVE_FD Message-ID: References: <20260129212510.967611-1-dmatlack@google.com> <20260129212510.967611-9-dmatlack@google.com> Precedence: bulk X-Mailing-List: linux-pci@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260129212510.967611-9-dmatlack@google.com> On Thu, Jan 29, 2026 at 09:24:55PM +0000, David Matlack wrote: > Enforce that files for incoming (preserved by previous kernel) VFIO > devices are retrieved via LIVEUPDATE_SESSION_RETRIEVE_FD rather than by > opening the corresponding VFIO character device or via > VFIO_GROUP_GET_DEVICE_FD. > > Both of these methods would result in VFIO initializing the device > without access to the preserved state of the device passed by the > previous kernel. > > Signed-off-by: David Matlack > --- > drivers/vfio/device_cdev.c | 4 ++++ > drivers/vfio/group.c | 9 +++++++++ > include/linux/vfio.h | 18 ++++++++++++++++++ > 3 files changed, 31 insertions(+) > Reviewed-by: Pranjal Shrivastava Thanks, Praan