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conf: add eim attribute to <iommu><driver>

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Add an attribute to control extended interrupt mode.

https://bugzilla.redhat.com/show_bug.cgi?id=1451282

Reviewed-by: Andrea Bolognani <abologna@redhat.com>
This commit is contained in:
Ján Tomko
2017-05-26 08:11:25 +02:00
parent 2453501fc8
commit dc61d92758
7 changed files with 73 additions and 0 deletions
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docs/formatdomain.html.in
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@@ -7436,6 +7436,19 @@ qemu-kvm -net nic,model=? /dev/null
<span class="since">Since 3.4.0</span> (QEMU/KVM only)
</p>
</dd>
<dt><code>eim</code></dt>
<dd>
<p>
The <code>eim</code> attribute (with possible values
<code>on</code> and <code>off</code>) can be used to
configure Extended Interrupt Mode. A q35 domain with
split I/O APIC (as described in
<a href="#elementsFeatures">hypervisor features</a>),
and both interrupt remapping and EIM turned on for
the IOMMU, will be able to use more than 255 vCPUs.
<span class="since">Since 3.4.0</span> (QEMU/KVM only)
</p>
</dd>
</dl>
</dd>
</dl>