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Add error messages to pci_strictreset description

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Marek Marczykowski-Górecki 2016-09-28 10:19:12 +02:00 committed by GitHub
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basics_user/user-faq.md
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@ -253,6 +253,19 @@ A device that does not support reset is not safe and generally should not be ass
Most likely the offending controller is a USB3.0 device. You can remove this controller from the usbVM, and see if this allows the VM to boot.
Alternatively you may be able to disable USB 3.0 in the BIOS.
Errors suggesting this issue:
- in `xl dmesg` output:
```
(XEN) [VT-D] It's disallowed to assign 0000:00:1a.0 with shared RMRR at dbe9a000 for Dom19.
(XEN) XEN_DOMCTL_assign_device: assign 0000:00:1a.0 to dom19 failed (-1)
```
- during `qvm-start sys-usb`:
```
internal error: Unable to reset PCI device [...] no FLR, PM reset or bus reset available.
```
Another solution would be to set the pci_strictreset option using qvm-prefs in dom0:
`qvm-prefs usbVM -s pci_strictreset false`