On Thu, 19 Aug 2010, Anthony Liguori wrote: > On 08/19/2010 04:21 PM, Blue Swirl wrote: > > > Should CPUs appear in the QEMU device tree? > > > > > They have several properties that should be user visible. > > > > Sure, but that's an argument for having some of the qdev features (like > variant properties) be consumable outside of qdev. >
[..snip..] > > Yes, but the programming model was different. > > Look at the PIC compared to the lapic. The PIC is programmed via pio at a > fixed location. There is only one PIC and it interacts with the system just > like all other devices. IOW, there is no reference to CPUState. There are two PICs actually there's a cascade.. > > When you look at the local APIC (apic.c) however, you see that it's the only > device in the tree that actually interacts with a CPUState. The notion of > cpu_get_current_apic() is a good example of the tricks needed to make this > work. > > The local APIC is a cpu feature, not a device. > > Regards, > > Anthony Liguori > -- mailto:av1...@comtv.ru
