From: John Allen <john.allen@amd.com>
Date: Thu, 9 Apr 2020 15:34:29 +0000 (-0500)
Subject: x86/microcode/AMD: Increase microcode PATCH_MAX_SIZE
X-Git-Tag: v5.5.19~1
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d263f19cdc2ac82168fbc26e3a4fd649ffc2d75b;p=thirdparty%2Fkernel%2Fstable.git

x86/microcode/AMD: Increase microcode PATCH_MAX_SIZE

commit bdf89df3c54518eed879d8fac7577fcfb220c67e upstream.

Future AMD CPUs will have microcode patches that exceed the default 4K
patch size. Raise our limit.

Signed-off-by: John Allen <john.allen@amd.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: stable@vger.kernel.org # v4.14..
Link: https://lkml.kernel.org/r/20200409152931.GA685273@mojo.amd.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/arch/x86/include/asm/microcode_amd.h b/arch/x86/include/asm/microcode_amd.h
index 209492849566c..5c524d4f71cd7 100644
--- a/arch/x86/include/asm/microcode_amd.h
+++ b/arch/x86/include/asm/microcode_amd.h
@@ -41,7 +41,7 @@ struct microcode_amd {
 	unsigned int			mpb[0];
 };
 
-#define PATCH_MAX_SIZE PAGE_SIZE
+#define PATCH_MAX_SIZE (3 * PAGE_SIZE)
 
 #ifdef CONFIG_MICROCODE_AMD
 extern void __init load_ucode_amd_bsp(unsigned int family);