On Fri, 2012-10-26 at 11:58 +0200, Paolo Bonzini wrote: > Il 25/10/2012 21:40, Benjamin Herrenschmidt ha scritto: > >> > Probably you do need a variant of KVM_CREATE_IRQCHIP to create the > >> > IOAPICs/source controllers (Paul's proposal at > >> > http://permalink.gmane.org/gmane.comp.emulators.kvm.powerpc.devel/5674 > >> > for example), assign chip ids to them, set the number of input lines, > >> > etc. but the configuration should work well with the existing ioctls, > >> > with no limit on the number of sources. > > But what do you mean by "configuration" really ? I don't see anything in > > common there. > > Wiring which MSI-X interrupts go to which source controllers. If you > have one source controller per PCI bridge, you need to tell the kernel > the mapping between MSI messages interrupts and PCI bridges, and update > it whenever the MSI masking changes. Not sure I get it. Are you talking in the context of PCI pass-through ? Each PCI bridge on POWER has its own set of MSIs though for emulated bridges it's a non-issue, it's all dealt with by qemu, so I'm not sure what you mean here. > The other problem is configuring the redirection table. If you need >64 > sources you need ioctls like KVM_GET/SET_IRQCHIP_ONE_REG. Well, all of that is totally specific to the IO-APIC design & limitations as far as I can tell. What is the "redirection table" ? Cheers, Ben. -- 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
