linux-kernel - [PATCH 05/13] x86/microcode/AMD: Extend the container struct

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Message-Id: <20170117173734.14251-6-bp@alien8.de>
Date:   Tue, 17 Jan 2017 18:37:26 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     X86 ML <x86@...nel.org>
Cc:     LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH 05/13] x86/microcode/AMD: Extend the container struct

From: Borislav Petkov <bp@...e.de>

Make it into a container descriptor which is being passed around and
stores important info like the matching container and the patch for the
current CPU.

Later patches will use this and thus get rid of a double container
parsing.

Signed-off-by: Borislav Petkov <bp@...e.de>
---
 arch/x86/kernel/cpu/microcode/amd.c | 22 +++++++++++++---------
 1 file changed, 13 insertions(+), 9 deletions(-)

diff --git a/arch/x86/kernel/cpu/microcode/amd.c b/arch/x86/kernel/cpu/microcode/amd.c
index ef36b613db62..7073588a2a09 100644
--- a/arch/x86/kernel/cpu/microcode/amd.c
+++ b/arch/x86/kernel/cpu/microcode/amd.c
@@ -42,9 +42,13 @@ static struct equiv_cpu_entry *equiv_cpu_table;
 
 /*
  * This points to the current valid container of microcode patches which we will
- * save from the initrd/builtin before jettisoning its contents.
+ * save from the initrd/builtin before jettisoning its contents. @mc is the
+ * microcode patch we found to match.
  */
-struct container {
+struct cont_desc {
+	struct microcode_amd *mc;
+	u32 psize;
+	u16 eq_id;
 	u8 *data;
 	size_t size;
 } cont;
@@ -119,9 +123,9 @@ static u16 find_equiv_id(struct equiv_cpu_entry *equiv_table, u32 sig)
  * table or 0 if none found.
  */
 static u16
-find_proper_container(u8 *ucode, size_t size, struct container *ret_cont)
+find_proper_container(u8 *ucode, size_t size, struct cont_desc *desc)
 {
-	struct container ret = { NULL, 0 };
+	struct cont_desc ret = { 0 };
 	u32 eax, ebx, ecx, edx;
 	struct equiv_cpu_entry *eq;
 	int offset, left;
@@ -164,7 +168,7 @@ find_proper_container(u8 *ucode, size_t size, struct container *ret_cont)
 			 */
 			left = ret.size - offset;
 
-			*ret_cont = ret;
+			*desc = ret;
 			return eq_id;
 		}
 
@@ -219,11 +223,11 @@ static int __apply_microcode_amd(struct microcode_amd *mc)
  * Returns true if container found (sets @ret_cont), false otherwise.
  */
 static bool apply_microcode_early_amd(void *ucode, size_t size, bool save_patch,
-				      struct container *ret_cont)
+				      struct cont_desc *desc)
 {
 	u8 (*patch)[PATCH_MAX_SIZE];
 	u32 rev, *header, *new_rev;
-	struct container ret;
+	struct cont_desc ret;
 	int offset, left;
 	u16 eq_id = 0;
 	u8  *data;
@@ -276,8 +280,8 @@ static bool apply_microcode_early_amd(void *ucode, size_t size, bool save_patch,
 		left   -= offset;
 	}
 
-	if (ret_cont)
-		*ret_cont = ret;
+	if (desc)
+		*desc = ret;
 
 	return true;
 }
-- 
2.11.0