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[34.127.79.33]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-3ae85cb1bfdsm10260602a91.0.2026.11.02.16.54.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 02 Nov 2026 16:54:36 -0800 (PST) Date: Tue, 3 Nov 2026 00:54:32 +0000 From: David Matlack To: Mina Almasry Cc: Peter Xu , Alex Williamson , Andrew Morton , kvm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, Shuah Khan , Kevin Tian , Jason Gunthorpe , Raghavendra Rao Ananta , Vipin Sharma , Alex Mastro , Matt Evans Subject: Re: [PATCH v3 2/3] vfio: selftests: Add vfio_pci_find_mem_bar() helper Message-ID: References: <20261102230445.3993629-1-almasrymina@google.com> <20261102230445.3993629-3-almasrymina@google.com> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20261102230445.3993629-3-almasrymina@google.com> On 2026-11-02 11:04 PM, Mina Almasry wrote: > Add vfio_pci_find_mem_bar() to libvfio to locate a BAR (or range within > a BAR) of at least min_size bytes that behaves like ordinary memory and > can be safely read and written without device-specific side effects. > > Detection is backed by a table of known devices, starting with QEMU's > pci-testdev (1b36:0005) BAR 2 when configured with membar= and > membar-backed=on. > > Suggested-by: David Matlack > Cc: David Matlack > Cc: Matt Evans > Signed-off-by: Mina Almasry Reviewed-by: David Matlack