Re: [libvirt-users] [virtual interface] detach interface during boot succeed with no changes

Hi Laine, As for the hot-unplug behavior, I have one more question about it, could you please help to confirm? unplugging a PCI device properly requires cooperation from the guest OS. > If the guest OS isn't running yet, the unplug won't complete, so qemu > (and libvirt) still show the device as plugged into the guest. > > virsh reports success on the unplug because unplugging a device is done > asynchronously - the "success" means "libvirt successfully told qemu to > unplug the device, qemu has told the virtual machine to unplug the > device, and is waiting for acknowledgment from the virtual machine that > the guest has completed removal". At some later time the guest OS may > complete its part of the unplug; when that happens, qemu will get a > notification and will send an event to libvirt - at that time the device > will be removed from libvirt's list of devices. > > tl;dr - this is all expected. > The question is that, when I unplug it during boot, the virsh cmd will succeed but the interface still exists, which is expected. After the vm boot successfully, the guest OS will *not* complete this removal. When I tried to detach it again, it reported that the device was in the process of unplugging. Is this acceptable? # virsh detach-interface rhel_new network 52:54:00:36:a8:d4 Interface detached successfully # virsh domiflist rhel_new Interface Type Source Model MAC ------------------------------------------------------------- vnet4 network default virtio 52:54:00:36:a8:d4 # virsh detach-interface rhel_new network 52:54:00:36:a8:d4 error: Failed to detach interface error: internal error: unable to execute QEMU command 'device_del': Device net0 is already in the process of unplug