On Mon, 29 Aug 2022, Maciej W. Rozycki wrote: > The Intel 82378ZB System I/O (SIO) and 82379AB System I/O APIC (SIO.A) > ISA bridges implement PCI interrupt steering with a PIRQ router[1][2] > that is exactly the same as that of the PIIX and ICH southbridges (or > actually the other way round, given that the SIO ASIC was there first). Ping for: <https://lore.kernel.org/lkml/alpine.DEB.2.21.2208291916390.61470@xxxxxxxxxxxxxxxxx/>. Maciej