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[Qemu-devel] [Bug 1586611] Re: usb-hub can not be detached when detach u
From: |
Gerd Hoffmann |
Subject: |
[Qemu-devel] [Bug 1586611] Re: usb-hub can not be detached when detach usb device from VM |
Date: |
Thu, 30 Aug 2018 10:11:43 -0000 |
Use a newer libvirt version which manages usb addressing and assigns usb
devices to usb ports. This is required to make sure the physical device
tree is the same after vmsave/vmload or live migration.
** Changed in: qemu
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1586611
Title:
usb-hub can not be detached when detach usb device from VM
Status in QEMU:
Invalid
Bug description:
I give a host usb device to guest in the way of using "virsh attach-device"
cmd. In guest os,use "lsusb" cmd I can see two devices have been added,one is
usb device and the other is usb-hub(0409:55aa NEC Corp. Hub).
when I use "virsh detach-device" detach the usb device,in guest os the
usb-hub was still exists.
It can create a bad impression when operating the VM,for example,suspend and
resume the VM,qemu would report that:
2016-05-24T12:03:54.434369Z qemu-kvm: Unknown savevm section or
instance '0000:00:01.2/2/usb-hub' 0
2016-05-24T12:03:54.434742Z qemu-kvm: load of migration failed:
Invalid argument
From qemu's code,it can be sure that the usb-hub is generated by
qemu,but could not be seen in xml file of libvirt. So when executing
the migration of VM or resuming VM after suspended,it report error
like "Unknown savevm section or instance '0000:00:01.2/2/usb-hub' 0"
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