x86, microcode: Add a disable chicken bit

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Add a cmdline param which disables the microcode loader. This is useful
mostly in debugging situations where we want to turn off microcode
loading, both early from the initrd and late, as a means to be able to
rule out its influence on the machine.

Signed-off-by: Borislav Petkov <bp@suse.de>
Link: http://lkml.kernel.org/r/1400525957-11525-3-git-send-email-bp@alien8.de
Signed-off-by: H. Peter Anvin <hpa@zytor.com>

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Borislav Petkov 2014-05-19 20:59:17 +02:00 • committed by H. Peter Anvin

parent 1b1ded57a4

commit 65cef1311d

3 changed files with 44 additions and 0 deletions

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1

arch/x86/include/asm/microcode.h

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6

arch/x86/kernel/cpu/microcode/core.c

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37

arch/x86/kernel/cpu/microcode/core_early.c

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