1.. _vhost_user_rng: 2 3QEMU vhost-user-rng - RNG emulation 4=================================== 5 6Background 7---------- 8 9What follows builds on the material presented in vhost-user.rst - it should 10be reviewed before moving forward with the content in this file. 11 12Description 13----------- 14 15The vhost-user-rng device implementation was designed to work with a random 16number generator daemon such as the one found in the vhost-device crate of 17the rust-vmm project available on github [1]. 18 19[1]. https://github.com/rust-vmm/vhost-device 20 21Examples 22-------- 23 24The daemon should be started first: 25 26:: 27 28 host# vhost-device-rng --socket-path=rng.sock -c 1 -m 512 -p 1000 29 30The QEMU invocation needs to create a chardev socket the device can 31use to communicate as well as share the guests memory over a memfd. 32 33:: 34 35 host# qemu-system \ 36 -chardev socket,path=$(PATH)/rng.sock,id=rng0 \ 37 -device vhost-user-rng-pci,chardev=rng0 \ 38 -m 4096 \ 39 -object memory-backend-file,id=mem,size=4G,mem-path=/dev/shm,share=on \ 40 -numa node,memdev=mem \ 41 ... 42