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.. _vhost_user_rng:
QEMU vhost-user-rng - RNG emulation
===================================
Background
----------
What follows builds on the material presented in vhost-user.rst - it should
be reviewed before moving forward with the content in this file.
Description
-----------
The vhost-user-rng device implementation was designed to work with a random
number generator daemon such as the one found in the vhost-device crate of
the rust-vmm project available on github [1].
[1]. https://github.com/rust-vmm/vhost-device
Examples
--------
The daemon should be started first:
::
host# vhost-device-rng --socket-path=rng.sock -c 1 -m 512 -p 1000
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=$(PATH)/rng.sock,id=rng0 \
-device vhost-user-rng-pci,chardev=rng0 \
-m 4096 \
-object memory-backend-file,id=mem,size=4G,mem-path=/dev/shm,share=on \
-numa node,memdev=mem \
...
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