x86, amd: Restrict usage of c1e_idle()

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Currently c1e_idle returns true for all CPUs greater than or equal to
family 0xf model 0x40. This covers too many CPUs.

Meanwhile a respective erratum for the underlying problem was filed
(#400). This patch adds the logic to check whether erratum #400
applies to a given CPU.
Especially for CPUs where SMI/HW triggered C1e is not supported,
c1e_idle() doesn't need to be used. We can check this by looking at
the respective OSVW bit for erratum #400.

Cc: <stable@kernel.org> # .32.x .33.x
Signed-off-by: Andreas Herrmann <andreas.herrmann3@amd.com>
LKML-Reference: <20100319110922.GA19614@alberich.amd.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>

...

This commit is contained in:

Andreas Herrmann 2010-03-19 12:09:22 +01:00 • committed by H. Peter Anvin

parent ff30a0543e

commit 035a02c1e1

2 changed files with 26 additions and 8 deletions

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2

arch/x86/include/asm/msr-index.h

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32

arch/x86/kernel/process.c

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