On 05/11/2014 21:45, Nadav Amit wrote: > If I understand the SDM correctly, in such scenario (all APICs are > software disabled) the mode is left as the default - flat mode (see > section 10.6.2.2 "Logical Destination Mode”): "All processors that > have their APIC software enabled (using the spurious vector > enable/disable bit) must have their DFRs (Destination Format > Registers) programmed identically. The default mode for DFR is flat > mode.” That's not what either Bochs or QEMU do, though. (Though in the case of Bochs I cannot find the place where reception of IPIs is prevented for software-disabled APICs, so I'm not sure how much to trust it in this case). I'm not sure why software-disabled APICs could have different DFRs, if the APICs can receive NMI IPIs. I'll ask Intel. Paolo > So I think the previous behaviour (before the additional changes) is > the correct one. I might be able to confirm it, but anyhow only in a > couple of weeks. -- 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
