commit b538aacc94006412059471a94a80f2f58bf6ab3d
author John Allen <john.allen@amd.com> Thu Apr 09 10:34:29 2020 -0500
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> Tue Apr 21 09:05:05 2020 +0200
tree b29a2a8361232401b1c1da49fbfeb80bd6d55cea
parent 856a74fd7e61a2d2cdb88198967b4ab5ce172a25

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>

arch/x86/include/asm/microcode_amd.h

diff --git a/arch/x86/include/asm/microcode_amd.h b/arch/x86/include/asm/microcode_amd.h
index 2094928..5c524d4 100644
--- a/arch/x86/include/asm/microcode_amd.h
+++ b/arch/x86/include/asm/microcode_amd.h
@@ -41,7 +41,7 @@
 	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);