c47d4fa0c8
Add description and example for the vhost-user based RNG implementation. Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Message-Id: <20211012205904.4106769-4-mathieu.poirier@linaro.org> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
40 lines
1 KiB
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40 lines
1 KiB
ReStructuredText
QEMU vhost-user-rng - RNG emulation
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===================================
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Background
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----------
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What follows builds on the material presented in vhost-user.rst - it should
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be reviewed before moving forward with the content in this file.
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Description
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-----------
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The vhost-user-rng device implementation was designed to work with a random
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number generator daemon such as the one found in the vhost-device crate of
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the rust-vmm project available on github [1].
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[1]. https://github.com/rust-vmm/vhost-device
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Examples
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--------
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The daemon should be started first:
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::
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host# vhost-device-rng --socket-path=rng.sock -c 1 -m 512 -p 1000
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The QEMU invocation needs to create a chardev socket the device can
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use to communicate as well as share the guests memory over a memfd.
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::
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host# qemu-system \
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-chardev socket,path=$(PATH)/rng.sock,id=rng0 \
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-device vhost-user-rng-pci,chardev=rng0 \
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-m 4096 \
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-object memory-backend-file,id=mem,size=4G,mem-path=/dev/shm,share=on \
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-numa node,memdev=mem \
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...
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