From 2613f36ed965d0e5a595a1d931fd3b480e82d6fd Mon Sep 17 00:00:00 2001
From: Borislav Petkov <bp@suse.de>
Date: Wed, 14 Mar 2018 19:36:14 +0100
Subject: x86/microcode: Attempt late loading only when new microcode is
 present

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
---
 arch/x86/include/asm/microcode.h | 1 +
 1 file changed, 1 insertion(+)

(limited to 'arch/x86/include/asm')

diff --git a/arch/x86/include/asm/microcode.h b/arch/x86/include/asm/microcode.h
index 7fb1047d61c7..6cf0e4cb7b97 100644
--- a/arch/x86/include/asm/microcode.h
+++ b/arch/x86/include/asm/microcode.h
@@ -39,6 +39,7 @@ struct device;
 
 enum ucode_state {
 	UCODE_OK	= 0,
+	UCODE_NEW,
 	UCODE_UPDATED,
 	UCODE_NFOUND,
 	UCODE_ERROR,
-- 
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