On Fri, Mar 11, 2022 at 05:32:45PM +0100, Marek Marczykowski-Górecki wrote: > On Fri, Mar 11, 2022 at 04:43:22PM +0100, Roger Pau Monné wrote: > > Sorry, maybe this wasn't clear. My suggestion was not to just do this > > fix and call it done, but rather to add this check for sanity and then > > figure out how to properly handle this specific device. > > Yes, I agree. Having it properly configured is preferred. Linux manages > to do that, but I'm not sure how exactly. But ...
I think it might get the interrupt from ACPI data, which is likely out of scope for Xen. Can you take a look at ACPI data from the box and see whether the interrupt is reported there? (search for a _CRS method belonging to the LPSS device) Sadly the LPSS spec doesn't contain any help regarding the usage of 0xff in the Interrupt Line register. Out of curiosity, can you print what's in the Interrupt Pin register? (PCI_INTERRUPT_PIN) Thanks, Roger.
