The USB mouse worked on the Lenovo Flex 3-1570 during the installation process, 
but once installed, sys-usb (based on fedora-26) fails to start.

When I tried starting manually the following error was displayed:
ERROR: Start failed: internal error: Unale to reset PCI device 0000:00:14.0: 
internal error: libxenlight failed to create new domain 'sys-usb', see 
/var/log/libvirt/libxl/libxl-driver.log for details

/var/log/libvirt/libxl
2018-04-25 15:08:20.363+0000: libxl: libxl_pci.c:1176:libxl__device_pci_reset: 
The kernel doesn't support reset from sysfs for PCI device 0000:00:14.0
2018-04-25 15:08:20.363+0000: libxl: libxl_pci.c:1095:do_pci_add: Error: 
xc_physdev_map_pirq irq=-2147483648: Invalid argument
2018-04-25 15:08:20.363+0000: libxl: libxl_pci.c:1338:libxl__add_pcidevs: 
libxl_device_pci_add failed: -3
2018-04-25 15:08:20.363+0000: libxl: 
libxl_create.c:1512:domcreate_attach_devices: unable to add pci devices

There are two USB controllers (Intel Wildcat - xHCI and EHCI) but only xHCI 
seems to be an issue since if I remove it sys-usb starts up, however; the USB 
ports do not work.
Info from lspci -v -s 00:14
00:14.0 USB controller: Intel Corporation Wildcat Point-LP USB xHCI Controller 
(rev 03) (prog-if 30 [XHCI])
        Subsystem: Lenovo Device 3820
        Flags: medium devsel, IRQ -2147483648
        Memory at d4500000 (64-bit, non-prefetchable) [disabled] [size=64K]
        Capabilities: [70] Power Management version 2
        Capabilities: [80] MSI: Enable- Count=1/8 Maskable- 64bit+
        Kernel driver in use: pciback
        Kernel modules: xhci_pci

Based on recommendations for other, similar issues, I tried using PV instead of 
HVM, but it still wouldn't start.

Any help/suggests would be appreciated! -Thanks!

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