1 files changed, 44 insertions, 0 deletions
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+virtual: 0.954
+device: 0.952
+VMM: 0.926
+KVM: 0.926
+vnc: 0.891
+peripherals: 0.889
+performance: 0.884
+hypervisor: 0.865
+graphic: 0.843
+semantic: 0.803
+kernel: 0.793
+network: 0.782
+PID: 0.769
+ppc: 0.757
+architecture: 0.746
+permissions: 0.746
+socket: 0.730
+x86: 0.670
+i386: 0.668
+risc-v: 0.664
+arm: 0.655
+user-level: 0.635
+mistranslation: 0.613
+register: 0.592
+debug: 0.564
+files: 0.562
+TCG: 0.543
+boot: 0.466
+assembly: 0.290
+
+usb-hub can not be detached when detach usbdevice  VM
+
+I give a host usb device to guest in the way of passthrough,use "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,and the process of detaching usb-hub has already been executed,but failed.With adding print information,error as follows:
+libusbx: error [do_close] Device handle closed while transfer was still being processed, but the device is still connected as far as we know
+libusbx: warning [do_close] A cancellation for an in-flight transfer hasn't completed but closing the device handle
+