mp_irqdomain_activate from arch/x86/kernel/apic/io_apic.c will use the
chip_data that is set by the commit referred by Stefan ("XEN uses
irqdesc::irq_data_common::handler_data to store a per interrupt XEN data
pointer which contains XEN specific information.").
>From drivers/xen/events/events_base.c, xen_allocate_irq_gsi has a test:
if (gsi < nr_legacy_irqs())
irq = gsi;
[...]
xen_irq_init(irq);
And xen_irq_init calls irq_set_chip_data. That is not an irq number that
had a irq_desc allocated by Xen, but one of the legacy IRQs, which is
controlled by IO-APIC.
That still does not clarify why it works on bionic or upstream. But
documenting what I was able to investigate so far.
Cascardo.
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1896725
Title:
xenial 4.4.0-191-generic in -proposed has a regression
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu-kernel-tests/+bug/1896725/+subscriptions
--
ubuntu-bugs mailing list
[email protected]
https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
