x86/microcode: Attempt late loading only when new microcode is present

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commit 2613f36ed9 upstream.

Return UCODE_NEW from the scanning functions to denote that new microcode
was found and only then attempt the expensive synchronization dance.

Reported-by: Emanuel Czirai <xftroxgpx@protonmail.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Emanuel Czirai <xftroxgpx@protonmail.com>
Tested-by: Ashok Raj <ashok.raj@intel.com>
Tested-by: Tom Lendacky <thomas.lendacky@amd.com>
Link: https://lkml.kernel.org/r/20180314183615.17629-1-bp@alien8.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

This commit is contained in:

Borislav Petkov 2018-03-14 19:36:14 +01:00 • committed by Greg Kroah-Hartman

parent b0b1ac38e0

commit c81d7069dc

4 changed files with 28 additions and 19 deletions

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1

arch/x86/include/asm/microcode.h

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36

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

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8

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

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4

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

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