On Mon, 2023-08-07 at 21:45 +0100, 'Edwin Török' via qubes-users wrote: > > Must NOT use a USB qube. Using a USB qube results in an instant > host reboot as soon as the USB qube is booted (same issue happen on > KVM > when attempting to pass through any USB controller, even if the > controller is in an IOMMU group of its own). There is a newer BIOS > with > newer AGESA available, I'll have to retry using that. Using > permissive > mode or non-strict PCI reset doesn't help:
New BIOS doesn't help, but I found one source of the host reboot: bus reset of the USB3 controller PCI device. /sys/bus/pci/devices/0000:13:00.0/reset_method has 'bus', and its parent /sys/bus/pci/devices/0000:00:08.3/reset_method has 'pm'. No FLR on these (which is confirmed by 'lspci' it says FLReset-). Changing 'bus' to 'pm', and performing an unbind from /sys/bus/pci/drivers/xhci_hcd, and then echoing '1' to 'reset' seems to survive and it no longer causes the system to power off. (now I don't know whether the problem is with reseting the device, or resetting the parent's secondary bus, IIUC even if parent device's reset method is pm, secondary bus will still be reset if that is what the child does). Note that all the other USB controller's reset_method is already 'pm'. All but one USB controller is in D3hot (which is expected), the other is D0. Is a bus reset of a device in D3hot even valid? Although changing the 'reset_method' still doesn't make device pass- through work: attempting to pass it through still causes a host reboot (although more like a poweroff followed by a powerup than a warm reboot, I tried disabling various options in the BIOS but it still powers off directly, e.g. the PSP/SMU debug mode appeared promising but didn't help). Best regards, --Edwin -- You received this message because you are subscribed to the Google Groups "qubes-users" group. To unsubscribe from this group and stop receiving emails from it, send an email to qubes-users+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/qubes-users/f7cc0221505a19385893017a4d04800607e02802.camel%40etorok.net.
