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[Xen-devel] APIC handling on x86-64

As we had a report of a problem booting Xen on an IBM x460, dying on the 
BUG_ON() in init_apic_ldr() in
xen/include/asm-x86/mach-summit/mach_apic.h, I started comparing 32- and 64-bit 
APIC handling. Quickly I found that the
same case is handled gracefully in 64-bits, by just tying any extra CPUs to the 
highest bit. (I suppose, will try to
verify this with the originator, that the same machine also doesn't boot with 
native 32-bit Linux, as the exact same
issue should exist there).
While doing the same generally shouldn't be a problem, I wonder why this hasn't 
been discovered so far and how many
else differences there exist.

Thanks, Jan

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