x86, x2apic: use virtual wire A mode in disable_IO_APIC() with interrupt-remapping

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Impact: make kexec work with x2apic

disable_IO_APIC() gets called during crashdump aswell, which configures the
IO-APIC/LAPIC so that legacy interrupts can be delivered for the kexec'd kernel.

In the presence of interrupt-remapping, we need to change the
interrupt-remapping configuration aswell as modifying IO-APIC for virtual wire
B mode.

To keep things simple during the crash, use virtual wire A mode
(for which we don't need to touch io-apic and interrupt-remapping tables).

Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

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Suresh Siddha 2009-03-16 17:04:59 -07:00 • committed by H. Peter Anvin

parent 2e93456f5c

commit 7c6d9f9785

1 changed files with 10 additions and 2 deletions

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arch/x86/kernel/apic/io_apic.c

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