linux-kernel - [PATCH] x86/microcode/AMD: Increase microcode PATCH_MAX

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Date:   Thu, 9 Apr 2020 10:34:29 -0500
From:   John Allen <john.allen@....com>
To:     bp@...en8.de, linux-kernel@...r.kernel.org
Cc:     tglx@...utronix.de, mingo@...hat.com, hpa@...or.com, x86@...nel.org
Subject: [PATCH] x86/microcode/AMD: Increase microcode PATCH_MAX_SIZE


Future AMD cpus will have microcode patches that exceed the default 4K
page size.

Signed-off-by: John Allen <john.allen@....com>
Cc: stable@...r.kernel.org
---
diff --git a/arch/x86/include/asm/microcode_amd.h b/arch/x86/include/asm/microcode_amd.h
index 6685e1218959..7063b5a43220 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);