Re: [libvirt] [PATCHv2 8/8] virtio-rng: Add rate limiting options for virtio-RNG

Qemu's implementation of virtio RNG supports rate limiting of the entropy used. This patch exposes the option to tune this fucntionality.

This patch is based on qemu commit 904d6f588063fb5ad2b61998acdf1e73fb4 The rate limiting is exported in the XML as: <devices> ... <rng model='virtio'> <rate period='1234'>4321</rate>

<backend model='random'/> </rng> ... --- Notes: Version 2: - Qemu uses bytes/period, adapt the value according to that

@@ -4315,6 +4316,14 @@ qemu-kvm -net nic,model=? /dev/null <li>'virtio' &mdash; supported by qemu and virtio-rng kernel module</li> </ul> </dd> + <dt><code>rate</code></dt> + <dd> + <p> + The rate parameter allows to limit the rate that the entropy can be + read from the source. The value is in bits that the device is allowed + to read in the selected period. The default period is 1000ms or 1 second. + </p>