On 11/14/19 9:55 AM, George N. White III wrote:
On Thu, 14 Nov 2019 at 12:28, ToddAndMargo via users
<users@xxxxxxxxxxxxxxxxxxxxxxx <mailto: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.
I found https://libvirt.org/formatdomain.html#elementsHostDev:
"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.
https://libvirt.org/formatdomain.html says:
"Controllers
<https://libvirt.org/formatdomain.html#elementsControllers>
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
<https://libvirt.org/pci-hotplug.html> for guests where device hotplug
is expected."
Hi George,
Thank you!
-T
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