On Thu, 2017-05-18 at 11:09 +0200, Ján Tomko wrote: > Add an attribute to control extended interrupt mode. > > https://bugzilla.redhat.com/show_bug.cgi?id=1451282 [...] > @@ -7436,6 +7436,16 @@ 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 > + turn on extended interrupt mode. In combination with intremap > + and split I/O APIC, this allows for more vCPUs to be used. > + <span class="since">Since 3.4.0</span> (QEMU/KVM only) > + </p> > + </dd> > </dl> > </dd> > </dl> Actually, the documentation could use some work too. How about: 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) -- Andrea Bolognani / Red Hat / Virtualization -- libvir-list mailing list libvir-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/libvir-list
