diff mbox series

[tip:,x86/bugs] x86/nospec: Refactor UNTRAIN_RET[_*]

Message ID 169780183712.3135.11984022841629342518.tip-bot2@tip-bot2
State New
Headers
Series [tip:,x86/bugs] x86/nospec: Refactor UNTRAIN_RET[_*] |

Commit Message

tip-bot2 for Thomas Gleixner Oct. 20, 2023, 11:37 a.m. UTC 
  The following commit has been merged into the x86/bugs branch of tip:

Commit-ID:     e8efc0800b8b5045ba8c0d1256bfbb47e92e192a
Gitweb:        https://git.kernel.org/tip/e8efc0800b8b5045ba8c0d1256bfbb47e92e192a
Author:        Josh Poimboeuf <jpoimboe@kernel.org>
AuthorDate:    Mon, 04 Sep 2023 22:05:03 -07:00
Committer:     Borislav Petkov (AMD) <bp@alien8.de>
CommitterDate: Fri, 20 Oct 2023 12:41:57 +02:00

x86/nospec: Refactor UNTRAIN_RET[_*]

Factor out the UNTRAIN_RET[_*] common bits into a helper macro.

Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Acked-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/f06d45489778bd49623297af2a983eea09067a74.1693889988.git.jpoimboe@kernel.org
---
 arch/x86/include/asm/nospec-branch.h | 31 ++++++++-------------------
 1 file changed, 10 insertions(+), 21 deletions(-)
diff mbox series

Patch

diff --git a/arch/x86/include/asm/nospec-branch.h b/arch/x86/include/asm/nospec-branch.h
index 51e3f1a..dcc7847 100644
--- a/arch/x86/include/asm/nospec-branch.h
+++ b/arch/x86/include/asm/nospec-branch.h
@@ -288,35 +288,24 @@ 
  * As such, this must be placed after every *SWITCH_TO_KERNEL_CR3 at a point
  * where we have a stack but before any RET instruction.
  */
-.macro UNTRAIN_RET
+.macro __UNTRAIN_RET ibpb_feature, call_depth_insns
 #if defined(CONFIG_RETHUNK) || defined(CONFIG_CPU_IBPB_ENTRY)
 	VALIDATE_UNRET_END
 	ALTERNATIVE_3 "",						\
 		      CALL_UNTRAIN_RET, X86_FEATURE_UNRET,		\
-		      "call entry_ibpb", X86_FEATURE_ENTRY_IBPB,	\
-		     __stringify(RESET_CALL_DEPTH), X86_FEATURE_CALL_DEPTH
+		      "call entry_ibpb", \ibpb_feature,			\
+		     __stringify(\call_depth_insns), X86_FEATURE_CALL_DEPTH
 #endif
 .endm
 
-.macro UNTRAIN_RET_VM
-#if defined(CONFIG_RETHUNK) || defined(CONFIG_CPU_IBPB_ENTRY)
-	VALIDATE_UNRET_END
-	ALTERNATIVE_3 "",						\
-		      CALL_UNTRAIN_RET, X86_FEATURE_UNRET,		\
-		      "call entry_ibpb", X86_FEATURE_IBPB_ON_VMEXIT,	\
-		      __stringify(RESET_CALL_DEPTH), X86_FEATURE_CALL_DEPTH
-#endif
-.endm
+#define UNTRAIN_RET \
+	__UNTRAIN_RET X86_FEATURE_ENTRY_IBPB, __stringify(RESET_CALL_DEPTH)
 
-.macro UNTRAIN_RET_FROM_CALL
-#if defined(CONFIG_RETHUNK) || defined(CONFIG_CPU_IBPB_ENTRY)
-	VALIDATE_UNRET_END
-	ALTERNATIVE_3 "",						\
-		      CALL_UNTRAIN_RET, X86_FEATURE_UNRET,		\
-		      "call entry_ibpb", X86_FEATURE_ENTRY_IBPB,	\
-		      __stringify(RESET_CALL_DEPTH_FROM_CALL), X86_FEATURE_CALL_DEPTH
-#endif
-.endm
+#define UNTRAIN_RET_VM \
+	__UNTRAIN_RET X86_FEATURE_IBPB_ON_VMEXIT, __stringify(RESET_CALL_DEPTH)
+
+#define UNTRAIN_RET_FROM_CALL \
+	__UNTRAIN_RET X86_FEATURE_ENTRY_IBPB, __stringify(RESET_CALL_DEPTH_FROM_CALL)
 
 
 .macro CALL_DEPTH_ACCOUNT