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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2607:f8b0:4864:20::62f; envelope-from=viresh.kumar@linaro.org; helo=mail-pl1-x62f.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, 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: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Vincent Guittot , Jie Deng , Viresh Kumar , Bill Mills , Arnd Bergmann , Mike Holmes , =?UTF-8?q?Alex=20Benn=C3=A9e?= , stratos-dev@op-lists.linaro.org Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" Basic usage and example invocation. Signed-off-by: Viresh Kumar --- docs/tools/index.rst | 1 + docs/tools/vhost-user-i2c.rst | 75 +++++++++++++++++++++++++++++++++++ 2 files changed, 76 insertions(+) create mode 100644 docs/tools/vhost-user-i2c.rst diff --git a/docs/tools/index.rst b/docs/tools/index.rst index 3a5829c17a54..af2519406ddf 100644 --- a/docs/tools/index.rst +++ b/docs/tools/index.rst @@ -17,3 +17,4 @@ QEMU Tools Guide qemu-trace-stap virtfs-proxy-helper virtiofsd + vhost-user-i2c diff --git a/docs/tools/vhost-user-i2c.rst b/docs/tools/vhost-user-i2c.rst new file mode 100644 index 000000000000..8471b39d8b1d --- /dev/null +++ b/docs/tools/vhost-user-i2c.rst @@ -0,0 +1,75 @@ +QEMU vhost-user-i2c - I2C emulation backend +=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=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D + +Synopsis +-------- + +**vhost-user-i2c** [*OPTIONS*] + +Description +----------- + +This program is a vhost-user backend that emulates a VirtIO I2C bus. +This program takes the layout of the i2c bus and its devices on the host +OS and then talks to them via the /dev/i2c-X interface when a request +comes from the guest OS for an I2C device. + +This program is designed to work with QEMU's ``-device +vhost-user-i2c-pci`` but should work with any virtual machine monitor +(VMM) that supports vhost-user. See the Examples section below. + +Options +------- + +.. program:: vhost-user-i2c + +.. option:: -h, --help + + Print help. + +.. option:: -v, --verbose + + Increase verbosity of output + +.. option:: -s, --socket-path=3DPATH + + Listen on vhost-user UNIX domain socket at PATH. Incompatible with --fd. + +.. option:: -f, --fd=3DFDNUM + + Accept connections from vhost-user UNIX domain socket file descriptor FD= NUM. + The file descriptor must already be listening for connections. + Incompatible with --socket-path. + +.. option:: -l, --device-list=3DI2C-DEVICES + + I2c device list at the host OS in the format: + :[:],[:[:]] + + Example: --device-list "2:1c:20,3:10:2c" + + Here, + bus (decimal): adatper bus number. e.g. 2 for /dev/i2c-2, 3 for /dev= /i2c-3. + client_addr (hex): address for client device. e.g. 0x1C, 0x20, 0x10,= 0x2C. + +Examples +-------- + +The daemon should be started first: + +:: + + host# vhost-user-i2c --socket-path=3Dvi2c.sock --device-list 0:20 + +The QEMU invocation needs to create a chardev socket the device can +use to communicate as well as share the guests memory over a memfd. + +:: + + host# qemu-system \ + -chardev socket,path=3Dvi2c.sock,id=3Dvi2c \ + -device vhost-user-i2c-pci,chardev=3Dvi2c,id=3Di2c \ + -m 4096 \ + -object memory-backend-file,id=3Dmem,size=3D4G,mem-path=3D/dev/shm,s= hare=3Don \ + -numa node,memdev=3Dmem \ + ... --=20 2.25.0.rc1.19.g042ed3e048af