On 02/19/13 14:21, John Ferlan wrote:
On 02/13/2013 11:28 AM, Peter Krempa wrote:
Qemu's implementation of virtio RNG supports rate limiting of the
entropy used. This patch exposes the option to tune this fucntionality.
s/fucntionality/functionality
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>
...
---
docs/formatdomain.html.in | 9 +++++++++
docs/schemas/domaincommon.rng | 18 +++++++++++++++++-
src/conf/domain_conf.c | 17 +++++++++++++++++
src/conf/domain_conf.h | 2 ++
src/qemu/qemu_command.c | 8 ++++++++
.../qemuxml2argv-virtio-rng-random.args | 2 +-
.../qemuxml2argv-virtio-rng-random.xml | 1 +
7 files changed, 55 insertions(+), 2 deletions(-)
diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in
index e8cd086..b264460 100644
--- a/docs/formatdomain.html.in
+++ b/docs/formatdomain.html.in
@@ -4293,6 +4293,7 @@ qemu-kvm -net nic,model=? /dev/null
...
<devices>
<rng model='virtio'>
+ <rate period="2000">1234</rate>
<backend model='random'>/dev/random</backend>
<!-- OR -->
<backend model='egd' type='udp'>
@@ -4315,6 +4316,14 @@ qemu-kvm -net nic,model=? /dev/null
<li>'virtio' — 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>
+ </dd>
bits or bytes?
qemu uses bits for it's configuration value. As the expected data rades
are pretty low, I think bits can be used and potentially divided to
larger values if needed.
Peter
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