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conf: formatter/parser/RNG/docs for hostdev <driver name='kvm|vfio'/>

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A domain's <interface> or <hostdev>, as well as a <network>'s
<forward>, can now have an optional <driver name='kvm|vfio'/>
element. As of this patch, there is no functionality behind this new
knob - this patch adds support to the domain and network
formatter/parser, and to the RNG and documentation.

When the backend is added, legacy KVM PCI device assignment will
continue to be used when no driver name is specified (or if <driver
name='kvm'/> is specified), but if driver name is 'vfio', the new UEFI
Secure Boot compatible VFIO device assignment will be used.

Note that the parser doesn't automatically insert the current default
value of this setting. This is done on purpose because the two
possibilities are functionally equivalent from the guest's point of
view, and we want to be able to automatically start using vfio as the
default (even for existing domains) at some time in the future. This
is similar to what was done with the "vhost" driver option in
<interface>.
This commit is contained in:
Laine Stump
2013-03-15 15:15:14 -04:00
parent 9f80fc1bd5
commit c4f63ef080
6 changed files with 167 additions and 28 deletions
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15
docs/formatnetwork.html.in
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@@ -279,6 +279,20 @@
use the traditional <code>&lt; hostdev&gt;</code> device
definition. <span class="since"> Since 0.10.0</span>
<p>
To use VFIO device assignment rather than
traditional/legacy KVM device assignment (VFIO is a new
method of device assignment that is compatible with UEFI
Secure Boot), a &lt;forward type='hostdev'&gt; interface
can have an optional <code>driver</code> sub-element
with a <code>name</code> attribute set to "vfio". To use
legacy KVM device assignment you can
set <code>name</code> to "kvm" (or simply omit the
&lt;driver&gt; element, since "kvm" is currently the
default).
<span class="since">Since 1.0.5 (QEMU and KVM only, requires kernel 3.6 or newer)</span>
</p>
<p>Note that this "intelligent passthrough" of network
devices is very similar to the functionality of a
standard <code>&lt; hostdev&gt;</code> device, the
@@ -360,6 +374,7 @@
<pre>
...
&lt;forward mode='hostdev' managed='yes'&gt;
&lt;driver name='vfio'/&gt;
&lt;address type='pci' domain='0' bus='4' slot='0' function='1'/&gt;
&lt;address type='pci' domain='0' bus='4' slot='0' function='2'/&gt;
&lt;address type='pci' domain='0' bus='4' slot='0' function='3'/&gt;