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Tue, 8 Nov 2022 08:38:32 +0800 (CST) Received: from DESKTOP-27KDQMV.china.huawei.com (10.174.148.223) by kwepemi100025.china.huawei.com (7.221.188.158) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.31; Tue, 8 Nov 2022 08:42:11 +0800 To: , , , CC: , , , , , , , Longpeng Subject: [PATCH v8 5/5] docs: Add generic vhost-vdpa device documentation Date: Tue, 8 Nov 2022 08:41:57 +0800 Message-ID: <20221108004157.1112-6-longpeng2@huawei.com> X-Mailer: git-send-email 2.25.0.windows.1 In-Reply-To: <20221108004157.1112-1-longpeng2@huawei.com> References: <20221108004157.1112-1-longpeng2@huawei.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Originating-IP: [10.174.148.223] X-ClientProxiedBy: dggems701-chm.china.huawei.com (10.3.19.178) To kwepemi100025.china.huawei.com (7.221.188.158) X-CFilter-Loop: Reflected Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=45.249.212.187; envelope-from=longpeng2@huawei.com; helo=szxga01-in.huawei.com X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, 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: , Reply-to: "Longpeng(Mike)" From: "Longpeng(Mike)" via Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZM-MESSAGEID: 1667868198323100003 Content-Type: text/plain; charset="utf-8" From: Longpeng Signed-off-by: Longpeng --- docs/system/devices/vhost-vdpa-device.rst | 43 +++++++++++++++++++++++ 1 file changed, 43 insertions(+) create mode 100644 docs/system/devices/vhost-vdpa-device.rst diff --git a/docs/system/devices/vhost-vdpa-device.rst b/docs/system/device= s/vhost-vdpa-device.rst new file mode 100644 index 0000000000..b758c4fce6 --- /dev/null +++ b/docs/system/devices/vhost-vdpa-device.rst @@ -0,0 +1,43 @@ + +=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D +generic vhost-vdpa device +=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D + +This document explains the usage of the generic vhost vdpa device. + +Description +----------- + +vDPA(virtio data path acceleration) device is a device that uses a datapath +which complies with the virtio specifications with vendor specific control +path. + +QEMU provides two types of vhost-vdpa devices to enable the vDPA device, o= ne +is type sensitive which means QEMU needs to know the actual device type +(e.g. net, blk, scsi) and another is called "generic vdpa device" which is +type insensitive (likes vfio-pci). + +Examples +-------- + +Prepare the vhost-vdpa backends first: + +:: + host# ls -l /dev/vhost-vdpa-* + crw------- 1 root root 236, 0 Nov 2 00:49 /dev/vhost-vdpa-0 + +Start QEMU with virtio-mmio bus: + +:: + host# qemu-system \ + -M microvm -m 512 -smp 2 -kernel ... -initrd ... \ + -device vhost-vdpa-device,vhostdev=3D/dev/vhost-vdpa-0 \ + ... + +Start QEMU with virtio-pci bus: + +:: + host# qemu-system \ + -M pc -m 512 -smp 2 \ + -device vhost-vdpa-device-pci,vhostdev=3D/dev/vhost-vdpa-0 \ + ... --=20 2.23.0