Hello,
I see that as part of libvirt's documentation [0] the q35 machine type will feature at most 1 hotplugged PCIe device - default - and users must prepare in advance according to their expectations of how many ifaces will be hotplugged:
"""
"""
Slots on the pcie-root controller do not support hotplug, so the device will be hotplugged into the pcie-root-port controller. If you plan to hotplug more than a single PCI Express device, you should add a suitable number of pcie-root-port controllers when defining the guest: for example, add
```xml
<controller type='pci' model='pcie-root'/>
<controller type='pci' model='pcie-root-port'/>
<controller type='pci' model='pcie-root-port'/>
<controller type='pci' model='pcie-root-port'/>
```xml
<controller type='pci' model='pcie-root'/>
<controller type='pci' model='pcie-root-port'/>
<controller type='pci' model='pcie-root-port'/>
<controller type='pci' model='pcie-root-port'/>
```
if you expect to hotplug up to three PCI Express devices, either emulated or assigned from the host.
if you expect to hotplug up to three PCI Express devices, either emulated or assigned from the host.
"""
Is there any alternative to this ?
For our use case, I'm considering mimicking Openstack's implementation - [1] - and expose a knob that indicates what is the number of PCIe root ports to be used upon the domain definition.
I wonder how open would the community be to having a machine type alias that would provide a "better" default - in the sense that it would have more root port controllers.
