On Sun, Apr 19, 2009 at 05:20:37PM +0300, Avi Kivity wrote: > Gleb Natapov wrote: >>> Could you elaborate on that? How/why does it use NMIs for task >>> switching? >>> >>> >> During WHQL testing (or if you just enable verifier on windows 2003) >> windows changes hibernate to not power down a PC, but resume >> immediately. During this immediate resume it sends NMI to non-boot CPUs >> while IDT for nmi is configured as a task gate. I am not sure it >> actually calls IRET after that. >> > > If it doesn't call IRET, it will never see another NMI. > > But of course it will execute IRET, as part of normal execution. You > can't do anything without it. > Boot CPU can send INIT after task switch (and I think this is what happens). -- Gleb. -- 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
