linux-kernel - [PATCH v2 01/14] x86: Add insn_decode

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Message-ID: <20210318171919.458304970@infradead.org>
Date:   Thu, 18 Mar 2021 18:11:04 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     x86@...nel.org, jpoimboe@...hat.com, jgross@...e.com,
        mbenes@...e.com
Cc:     linux-kernel@...r.kernel.org, peterz@...radead.org
Subject: [PATCH v2 01/14] x86: Add insn_decode_kernel()

Add a helper to decode kernel instructions; there's no point in
endlessly repeating those last two arguments.

Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
---
 arch/x86/include/asm/insn.h        |    2 ++
 arch/x86/kernel/alternative.c      |    2 +-
 arch/x86/kernel/cpu/mce/severity.c |    2 +-
 arch/x86/kernel/kprobes/core.c     |    4 ++--
 arch/x86/kernel/kprobes/opt.c      |    2 +-
 arch/x86/kernel/traps.c            |    2 +-
 tools/arch/x86/include/asm/insn.h  |    4 +++-
 7 files changed, 11 insertions(+), 7 deletions(-)

--- a/arch/x86/include/asm/insn.h
+++ b/arch/x86/include/asm/insn.h
@@ -150,6 +150,8 @@ enum insn_mode {
 
 extern int insn_decode(struct insn *insn, const void *kaddr, int buf_len, enum insn_mode m);
 
+#define insn_decode_kernel(_insn, _ptr) insn_decode((_insn), (_ptr), MAX_INSN_SIZE, INSN_MODE_KERN)
+
 /* Attribute will be determined after getting ModRM (for opcode groups) */
 static inline void insn_get_attribute(struct insn *insn)
 {
--- a/arch/x86/kernel/alternative.c
+++ b/arch/x86/kernel/alternative.c
@@ -1160,7 +1160,7 @@ static void text_poke_loc_init(struct te
 	if (!emulate)
 		emulate = opcode;
 
-	ret = insn_decode(&insn, emulate, MAX_INSN_SIZE, INSN_MODE_KERN);
+	ret = insn_decode_kernel(&insn, emulate);
 
 	BUG_ON(ret < 0);
 	BUG_ON(len != insn.length);
--- a/arch/x86/kernel/cpu/mce/severity.c
+++ b/arch/x86/kernel/cpu/mce/severity.c
@@ -225,7 +225,7 @@ static bool is_copy_from_user(struct pt_
 	if (copy_from_kernel_nofault(insn_buf, (void *)regs->ip, MAX_INSN_SIZE))
 		return false;
 
-	ret = insn_decode(&insn, insn_buf, MAX_INSN_SIZE, INSN_MODE_KERN);
+	ret = insn_decode_kernel(&insn, insn_buf);
 	if (ret < 0)
 		return false;
 
--- a/arch/x86/kernel/kprobes/core.c
+++ b/arch/x86/kernel/kprobes/core.c
@@ -279,7 +279,7 @@ static int can_probe(unsigned long paddr
 		if (!__addr)
 			return 0;
 
-		ret = insn_decode(&insn, (void *)__addr, MAX_INSN_SIZE, INSN_MODE_KERN);
+		ret = insn_decode_kernel(&insn, (void *)__addr);
 		if (ret < 0)
 			return 0;
 
@@ -316,7 +316,7 @@ int __copy_instruction(u8 *dest, u8 *src
 			MAX_INSN_SIZE))
 		return 0;
 
-	ret = insn_decode(insn, dest, MAX_INSN_SIZE, INSN_MODE_KERN);
+	ret = insn_decode_kernel(insn, dest);
 	if (ret < 0)
 		return 0;
 
--- a/arch/x86/kernel/kprobes/opt.c
+++ b/arch/x86/kernel/kprobes/opt.c
@@ -324,7 +324,7 @@ static int can_optimize(unsigned long pa
 		if (!recovered_insn)
 			return 0;
 
-		ret = insn_decode(&insn, (void *)recovered_insn, MAX_INSN_SIZE, INSN_MODE_KERN);
+		ret = insn_decode_kernel(&insn, (void *)recovered_insn);
 		if (ret < 0)
 			return 0;
 
--- a/arch/x86/kernel/traps.c
+++ b/arch/x86/kernel/traps.c
@@ -504,7 +504,7 @@ static enum kernel_gp_hint get_kernel_gp
 			MAX_INSN_SIZE))
 		return GP_NO_HINT;
 
-	ret = insn_decode(&insn, insn_buf, MAX_INSN_SIZE, INSN_MODE_KERN);
+	ret = insn_decode_kernel(&insn, insn_buf);
 	if (ret < 0)
 		return GP_NO_HINT;
 
--- a/tools/arch/x86/include/asm/insn.h
+++ b/tools/arch/x86/include/asm/insn.h
@@ -150,6 +150,8 @@ enum insn_mode {
 
 extern int insn_decode(struct insn *insn, const void *kaddr, int buf_len, enum insn_mode m);
 
+#define insn_decode_kernel(_insn, _ptr) insn_decode((_insn), (_ptr), MAX_INSN_SIZE, INSN_MODE_KERN)
+
 /* Attribute will be determined after getting ModRM (for opcode groups) */
 static inline void insn_get_attribute(struct insn *insn)
 {