On Thu, 14 Nov 2019 at 12:28, ToddAndMargo via users <users@xxxxxxxxxxxxxxxxxxxxxxx> wrote:
On 11/13/19 5:22 PM, George N. White III wrote:
> Has the USB controller been assigned as a PCI device to the VM? If so
> it would be
> detached from the host machine.
Controller USB 0
Controller: Type USB; Model USB2
XML:
<controller type="usb" index="0" model="ich9-ehci1">
<address type="pci" domain="0x0000" bus="0x00" slot="0x05"
function="0x7"/>
</controller>
I think this indicates that the USB controller is managed as a PCI device, but it has been a few years since I looked at this.
"For PCI devices, when
managed is "yes" it is detached from the host before being passed on to the guest and reattached to the host after the guest exits. If managed is omitted or "no", the user is responsible to call virNodeDeviceDetachFlags (or virsh nodedev-detach before starting the guest or hot-plugging the device and virNodeDeviceReAttach (or virsh nodedev-reattach) after hot-unplug or stopping the guest."Since managed is omitted, it seems the automatic detach/reattach should not be done.
"Controllers
Depending on the guest architecture, some device buses can appear more than once, with a group of virtual devices tied to a virtual controller. Normally, libvirt can automatically infer such controllers without requiring explicit XML markup, but sometimes it is necessary to provide an explicit controller element, notably when planning the PCI topology for guests where device hotplug is expected."
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George N. White III
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