[Bug 1811758] Re: virtio-rng backend should use getentropy() syscall when available

[Laurent Vivier]

rng-builtin is the new RNG default backend for virtio-rng and is based
on getrandom().

0198c2621a1e virtio-rng: change default backend to rng-builtin
5f7655f6ef15 virtio-rng: Keep the default backend out of VirtIORNGConf
6c4e9d487fea rng-builtin: add an RNG backend that uses qemu_guest_getrandom()

** Changed in: qemu
       Status: New => Fix Committed

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https://bugs.launchpad.net/bugs/1811758

Title:
  virtio-rng backend should use getentropy() syscall when available

Status in QEMU:
  Fix Committed

Bug description:
  According to https://wiki.qemu.org/Features/VirtIORNG the default
  backend for `virtio-rng-pci` is `/dev/random`.  Alternately, the user
  can point it to a different backend file, like `/dev/urandom`.

  However, both of these files have suboptimal behavior in one way or
  another, as documented in `random(7)`.  Instead, the default behavior
  should be to pull the requested octets from the `getrandom()` system
  call, if available, called with no flags set.

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