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docs: document how to disable memballoon
https://bugzilla.redhat.com/show_bug.cgi?id=623903 documents a qemu bug that causes libvirt to hang if virt-manager happens to be querying balloon info when a guest is paused. Until the qemu bug is fixed, people need to know how to avoid the issue. * docs/formatdomain.html.in (Memory balloon device): Mention model='none'.
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@ -1646,6 +1646,9 @@ qemu-kvm -net nic,model=? /dev/null
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need to explicitly add this element in the guest XML unless a
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specific PCI slot needs to be assigned.
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<span class="since">Since 0.8.3, Xen, QEMU and KVM only</span>
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Additionally, <span class="since">since 0.8.4</span>, if the
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memballoon device needs to be explicitly disabled,
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<code>model='none'</code> may be used.
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</p>
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<p>
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