When you add a bunch of pcie-root-port controllers to a q35 guest
in order to have hotplug capabilities, you also need to make sure
you're adding the pcie-root controller at the same time or you
will get an error. Document this fact.

Signed-off-by: Andrea Bolognani <abolo...@redhat.com>
 docs/pci-hotplug.html.in | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/docs/pci-hotplug.html.in b/docs/pci-hotplug.html.in
index 6e0648ee2..4ac87d644 100644
--- a/docs/pci-hotplug.html.in
+++ b/docs/pci-hotplug.html.in
@@ -72,6 +72,7 @@
+&lt;controller type='pci' model='pcie-root'/&gt;
 &lt;controller type='pci' model='pcie-root-port'/&gt;
 &lt;controller type='pci' model='pcie-root-port'/&gt;
 &lt;controller type='pci' model='pcie-root-port'/&gt;</pre>
@@ -80,7 +81,10 @@
       if you expect to hotplug up to three PCI Express devices,
       either emulated or assigned from the host. That's all the
       information you need to provide: libvirt will fill in the
-      remaining details automatically.
+      remaining details automatically. Note that you need to add
+      the <code>pcie-root</code> controller along with the
+      <code>pcie-root-port</code> controllers or you will get an
+      error.
       Note that if you're adding PCI controllers to a guest and at

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