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

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Date:   Tue, 14 Apr 2020 15:46:21 -0000
From:   "tip-bot2 for John Allen" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     John Allen <john.allen@....com>, Borislav Petkov <bp@...e.de>,
        stable@...r.kernel.org, #@...-bot2.tec.linutronix.de,
        "v4.14.."@tip-bot2.tec.linutronix.de, x86 <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: [tip: x86/urgent] x86/microcode/AMD: Increase microcode PATCH_MAX_SIZE

The following commit has been merged into the x86/urgent branch of tip:

Commit-ID:     bdf89df3c54518eed879d8fac7577fcfb220c67e
Gitweb:        https://git.kernel.org/tip/bdf89df3c54518eed879d8fac7577fcfb220c67e
Author:        John Allen <john.allen@....com>
AuthorDate:    Thu, 09 Apr 2020 10:34:29 -05:00
Committer:     Borislav Petkov <bp@...e.de>
CommitterDate: Tue, 14 Apr 2020 17:34:46 +02:00

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 <john.allen@....com>
Signed-off-by: Borislav Petkov <bp@...e.de>
Cc: stable@...r.kernel.org # v4.14..
Link: https://lkml.kernel.org/r/20200409152931.GA685273@mojo.amd.com
---
 arch/x86/include/asm/microcode_amd.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/microcode_amd.h b/arch/x86/include/asm/microcode_amd.h
index 6685e12..7063b5a 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);