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virtio-rng: Add rate limiting options for virtio-RNG

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

This patch is based on qemu commit 904d6f588063fb5ad2b61998acdf1e73fb4

The rate limiting is exported in the XML as:
<devices>
  ...
  <rng model='virtio'>
    <rate bytes='123' period='1234'/>
    <backend model='random'/>
  </rng>
  ...
This commit is contained in:
Peter Krempa
2013-02-13 15:37:39 +01:00
parent eb086eb5b5
commit 32bd699f55
7 changed files with 64 additions and 2 deletions
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13
docs/formatdomain.html.in
View File

@@ -4294,6 +4294,7 @@ qemu-kvm -net nic,model=? /dev/null
...
&lt;devices&gt;
&lt;rng model='virtio'&gt;
&lt;rate period="2000" bytes="1234"/&gt;
&lt;backend model='random'&gt;/dev/random&lt;/backend&gt;
&lt;!-- OR --&gt;
&lt;backend model='egd' type='udp'&gt;
@@ -4316,6 +4317,18 @@ 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 optional <code>rate</code> element allows limiting the rate at
which entropy can be consumed from the source. The mandatory
attribute <code>bytes</code> specifies how many bytes are permitted
to be consumed per period. An optional <code>period</code> attribute
specifies the duration of a period in milliseconds; if omitted, the
period is taken as 1000 milliseconds (1 second).
<span class='since'>Since 1.0.4</span>
</p>
</dd>
<dt><code>backend</code></dt>
<dd>
<p>

21
docs/schemas/domaincommon.rng
View File

@@ -3522,7 +3522,12 @@
<value>virtio</value>
</choice>
</attribute>
<ref name="rng-backend"/>
<interleave>
<ref name="rng-backend"/>
<optional>
<ref name="rng-rate"/>
</optional>
</interleave>
</element>
</define>
@@ -3550,6 +3555,20 @@
</element>
</define>
<define name="rng-rate">
<element name="rate">
<attribute name="bytes">
<ref name="positiveInteger"/>
</attribute>
<optional>
<attribute name="period">
<ref name="positiveInteger"/>
</attribute>
</optional>
<empty/>
</element>
</define>
<define name="usbmaster">
<element name="master">
<attribute name="startport">