Advice for implementing MSI-X support on NetBSD Xen 4.11?

[Jaromír Doleček <jaromir.dolecek@xxxxxxxxx>]

Hello,

I've implemented support for using MSI under NetBSD Dom0 with 4.11.
This works well.

I have some trouble now with getting MSI-X work under Xen.
PHYSDEVOP_map_pirq hypercall succeeds just as well as for MSI, but
interrupts don't seem to get delivered.

MSI-X interrupts work with NetBSD for the same devices when booted
natively, without Xen.

Can you give me some advice on where to start looking to get this
working? Is there perhaps something special to be done within the PCI
subsystem to allow Xen to take over?

Thank you.

Jaromir