[59213.312849] xenbr0: port 3(vif3.0) entered disabled state  //domU shutdown sequence start from here
[59215.247393] pciback 0000:05:00.0: xen_pciback: removing
[59215.247395] pciback 0000:05:00.0: xen_pciback: found device to remove
[59215.247396] pciback 0000:05:00.0: xen_pciback: pcistub_device_release
[59215.352893] pciback 0000:05:00.0: xen_pciback: MSI-X release failed (-16)
[59215.353199] xen_pciback: removed 0000:05:00.0 from seize list
[59216.474139] pciback 0000:05:00.0: xen_pciback: probing...
[59728.150053] xen_pciback: wants to seize 0000:05:00.0      //manual xl pci-assignable-add 05:00.0
[59728.150074] pciback 0000:05:00.0: xen_pciback: probing...
[59728.150075] pciback 0000:05:00.0: xen_pciback: seizing device
[59728.150076] pciback 0000:05:00.0: xen_pciback: pcistub_device_alloc
[59728.150076] pciback 0000:05:00.0: xen_pciback: initializing...
[59728.150077] pciback 0000:05:00.0: xen_pciback: initializing config
[59728.150165] pciback 0000:05:00.0: xen_pciback: enabling device
[59728.150247] xen: registering gsi 16 triggering 0 polarity 1
[59728.150250] Already setup the GSI :16
[59728.150293] pciback 0000:05:00.0: xen_pciback: MSI-X preparation failed (-6)
[59728.150582] pciback 0000:05:00.0: xen_pciback: save state of device
[59728.150731] pciback 0000:05:00.0: xen_pciback: resetting (FLR, D3, etc) the device
[59728.257558] pciback 0000:05:00.0: xen_pciback: reset device