6f588d6809
Lets not use beta release anymore, since we have a stable version available now. The newer version doesn't support Yamls anymore, but rather another feature "derive", which is quite easy to use actually. Lets migrate to it. Some of the tests can't be done anymore, drop them. Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> |
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| Cargo.toml | ||
| README.md | ||
vhost-device-i2c - I2C emulation backend daemon
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 or SMBUS device.
This program is tested 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.
Synopsis
vhost-device-i2c [OPTIONS]
Options
.. program:: vhost-device-i2c
.. option:: -h, --help
Print help.
.. option:: -s, --socket-path=PATH
Location of vhost-user Unix domain sockets, this path will be suffixed with 0,1,2..socket_count-1.
.. option:: -c, --socket-count=INT
Number of guests (sockets) to attach to, default set to 1.
.. option:: -l, --device-list=I2C-DEVICES
I2c device list at the host OS in the format: :<client_addr>[:<client_addr>],[:<client_addr>[:<client_addr>]]
Example: --device-list "2:32:21,3:10:23"
Here, bus (decimal): adatper bus number. e.g. 2 for /dev/i2c-2, 3 for /dev/i2c-3. client_addr (decimal): address for client device, 32 == 0x20.
Examples
The daemon should be started first:
::
host# vhost-device-i2c --socket-path=vi2c.sock --socket-count=1 --device-list 0:32
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=vi2c.sock,id=vi2c
-device vhost-user-i2c-pci,chardev=vi2c,id=i2c
-m 4096
-object memory-backend-file,id=mem,size=4G,mem-path=/dev/shm,share=on
-numa node,memdev=mem
...