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[92.0.155.74]) by smtp.gmail.com with ESMTPSA id c5sm12100641wrs.73.2021.04.25.22.45.22 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 25 Apr 2021 22:45:23 -0700 (PDT) From: Edge NFV To: qemu-devel@nongnu.org Subject: [PATCH] make vfio and DAX cache work together Date: Sun, 25 Apr 2021 22:45:12 -0700 Message-Id: <20210426054513.132980-1-edgenfv@gmail.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=2a00:1450:4864:20::436; envelope-from=edgenfv@gmail.com; helo=mail-wr1-x436.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-Mailman-Approved-At: Mon, 26 Apr 2021 09:08:52 -0400 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: edgenfv@gmail.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" I am using Kata containers and create containers inside the virtual machine. The hypervisor used is QEMU. My workload is I/O and network intensive. So, I prefer SR-IOV VF (which provides better network isolation) and DAX caching to work together. However, I was unable to create a QEMU based virual machine when the above mentioned featires are enabled together. Currently DAX cache need to be set to 0, to boot the VM successfully with the SR-IOV VF to be attached. Enabling both SR-IOV VF and DAX work together will potentially improve performance for workloads which are I/O and network intensive. This patch enables SR-IOV VF and DAX to work together.