On Wed, Nov 14, 2018 at 08:52:10PM +0000, Alex_Gagniuc@xxxxxxxxxxxx wrote: > But it does in portdrv_core.c: > > if (dev->aer_cap && pci_aer_available() && > (pcie_ports_native || host->native_aer)) { > services |= PCIE_PORT_SERVICE_AER; > > That flag later creates a pcie device that allows aerdrv to attach to. Oh, right. I saw negotiate_os_control() just uses a stack variable for the _OSC response, but if I had looked one level deeper, I'd see it cached in a different structure.