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From: "Jan Beulich" <JBeulich@novell.com>
To: xen-devel@lists.xensource.com
Subject: APIC handling on x86-64
Date: Fri, 17 Mar 2006 17:49:40 +0100	[thread overview]
Message-ID: <441AF6B4.76F0.0078.0@novell.com> (raw)

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

             reply	other threads:[~2006-03-17 16:49 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-03-17 16:49 Jan Beulich [this message]
2006-03-17 17:06 ` APIC handling on x86-64 Keir Fraser
  -- strict thread matches above, loose matches on Subject: below --
2006-03-19 19:15 Jan Beulich
2006-03-19 23:45 ` Keir Fraser
2006-03-20 13:53 Jan Beulich
2006-03-20 16:00 ` Keir Fraser
2006-03-20 16:21   ` Keir Fraser
2006-03-21 14:23 Jan Beulich
2006-03-21 14:34 ` Keir Fraser
2006-03-21 15:26   ` Paul Larson
2006-03-21 14:47 Jan Beulich
2006-03-21 15:30 Puthiyaparambil, Aravindh
2006-03-21 15:38 ` Keir Fraser

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