8c92046701
Add tests to validate processing of descriptors and read/write data. The design is based on the virtio_queue::mock::MockSplitQueue implementation, which is used to add a set of descriptors to the memory. The same memory is then processed via DescriptorChain and the same set of descriptors magically appear. This patch adds various tests for success and failure and also validate the data read or written. Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> |
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| src | ||
| 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
...