On 10/22/2012 01:31 PM, Eric W. Biederman wrote: >> >> IIRC Fenghua experimented with that and it didn't work. Not all BIOSes >> use that bit to determine BSP-ness. > > What does a BIOS have to do with anything? > > The practical issue here is does an INIT IPI cause the cpu to go into > startup-ipi-wait or to start booting at 4G-16 bytes. > > For dealing with BIOSen we may still need to use the bootstrap processor > for firmware calls, cpu suspend, and other firmware weirdness, but that > should all be completely orthogonal to the behavior to what happens > when an INIT IPI is sent to the cpu. > > The only firmware problem I can imagine having is cpu virtualization > bug. > The whole problem is that some BIOSes go wonky after receiving an INIT (as in INIT-SIPI-SIPI) to the BSP. -hpa
