On Tue, Feb 14, 2012 at 12:49:08PM +0000, Paul Brook wrote: > > > In a nutshell, I don't know what a SHPC is (nor OSHP), so I'm looking > > > for an additional Ack. > > > > No problem, I'll get an Ack :) > > Meanwhile - here's a summary, as far as I understand it. > > > > Originally PCI SIG only defined the electrical > > and mechanical requirements from hotplug, no standard > > software interface. So it needed ACPI to drive device-specific registers > > to actually do hotplug. > > At some point PCISIG defined standard interfaces > > for PCI hotplug. There are two of them: standard > > hot plug controller (SHPC) for PCI and PCIE hotplug > > for Express. > > > > Now an OS can have a standard driver and use it > > to activate hotplug functionality. This is OS hotplug (OSHP). > > So presumably this will work on targets that don't have ACPI? > Assuming a competent guest OS of course. Have you tested this? > > Paul This being the qemu side of things? I run Linux and verified that it calls OSHP and afterwards, runs the native driver and handles hotplug/unplug without invoking ACPI at all. It seems that at least the SHPC driver in linux doesn't work if you don't have an acpi table with the OSHP method - not many people run with acpi=off nowdays, so it's probably just a bug. I'll check how hard it is to fix this. -- MST -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
