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([106.84.131.166]) by smtp.gmail.com with ESMTPSA id fe12-20020a056a002f0c00b0062dcaa50a9asm2521331pfb.58.2023.04.07.01.25.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 07 Apr 2023 01:26:00 -0700 (PDT) From: Sam Li To: qemu-devel@nongnu.org Cc: Kevin Wolf , Cornelia Huck , Markus Armbruster , Stefan Hajnoczi , Raphael Norwitz , damien.lemoal@opensource.wdc.com, qemu-block@nongnu.org, Eric Blake , Hanna Reitz , Paolo Bonzini , hare@suse.de, "Michael S. Tsirkin" , dmitry.fomichev@wdc.com, kvm@vger.kernel.org, Sam Li Subject: [PATCH v10 5/5] docs/zoned-storage:add zoned emulation use case Date: Fri, 7 Apr 2023 16:25:28 +0800 Message-Id: <20230407082528.18841-6-faithilikerun@gmail.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230407082528.18841-1-faithilikerun@gmail.com> References: <20230407082528.18841-1-faithilikerun@gmail.com> MIME-Version: 1.0 Received-SPF: pass client-ip=2607:f8b0:4864:20::632; envelope-from=faithilikerun@gmail.com; helo=mail-pl1-x632.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-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Add the documentation about the example of using virtio-blk driver to pass the zoned block devices through to the guest. Signed-off-by: Sam Li --- docs/devel/zoned-storage.rst | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/docs/devel/zoned-storage.rst b/docs/devel/zoned-storage.rst index 6a36133e51..05ecf3729c 100644 --- a/docs/devel/zoned-storage.rst +++ b/docs/devel/zoned-storage.rst @@ -41,3 +41,20 @@ APIs for zoned storage emulation or testing. For example, to test zone_report on a null_blk device using qemu-io is: $ path/to/qemu-io --image-opts -n driver=host_device,filename=/dev/nullb0 -c "zrp offset nr_zones" + +To expose the host's zoned block device through virtio-blk, the command line +can be (includes the -device parameter): + -blockdev node-name=drive0,driver=host_device,filename=/dev/nullb0, + cache.direct=on \ + -device virtio-blk-pci,drive=drive0 +Or only use the -drive parameter: + -driver driver=host_device,file=/dev/nullb0,if=virtio,cache.direct=on + +Additionally, QEMU has several ways of supporting zoned storage, including: +(1) Using virtio-scsi: --device scsi-block allows for the passing through of +SCSI ZBC devices, enabling the attachment of ZBC or ZAC HDDs to QEMU. +(2) PCI device pass-through: While NVMe ZNS emulation is available for testing +purposes, it cannot yet pass through a zoned device from the host. To pass on +the NVMe ZNS device to the guest, use VFIO PCI pass the entire NVMe PCI adapter +through to the guest. Likewise, an HDD HBA can be passed on to QEMU all HDDs +attached to the HBA.