x86/microcode/AMD: Increase microcode PATCH_MAX_SIZE

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

Signed-off-by: John Allen <[email protected]>
Signed-off-by: Borislav Petkov <[email protected]>
Cc: [email protected] # v4.14..
Link: https://lkml.kernel.org/r/[email protected]

Author: jallen-amd

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);