On 03/20/2015 09:15 AM, Radim Krčmář wrote: > 2015-03-19 16:51-0600, James Sullivan: >> I played around with native_compose_msi_msg and discovered the following: >> >> * dm=0, rh=0 => Physical Destination Mode >> * dm=0, rh=1 => Failed delivery >> * dm=1, rh=0 => Logical Destination Mode, No Redirection >> * dm=1, rh=1 => Logical Destination Mode, Redirection > > Great! (What CPU family was that?) > This was on Intel x86_64 (Core i5-3210m, 'Ivy Bridge'). >> So it seems to be the case that logical destination mode is used whenever >> DM=1, regardless of RH. Furthermore, the case where DM=0 and RH=1 is >> undefined, as was indicated in the closing response to the thread in >> https://software.intel.com/en-us/forums/topic/288883 : > > DM=0+RH=1 might be defined to "fail", but I think it's acceptable to > treat it as undefined. (Deliver them in KVM if it improves something.) > My thoughts as well. > I'm still wondering about last sentence from that link, the > parenthesised part to be exact, > The reference to the APIC ID being 0xff is because 0xff is broadcast > and lowest priority (what the RH bit really is for X86) is illegal > with broadcast. > > Can you also check if RH=1 does something to delivery mode? > > Thanks. > Sure, I'll look into that as well. -James -- 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
