QEMU vhost-user-rng - RNG emulation¶
What follows builds on the material presented in vhost-user.rst - it should be reviewed before moving forward with the content in this file.
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 .
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 \ ...