linux-kernel - [PATCH 4.9 01/24] x86/speculation: Add RETPOLINE_AMD support to the inline asm CALL

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Date:   Wed,  9 Mar 2022 16:59:14 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Zhenzhong Duan <zhenzhong.duan@...cle.com>,
        Borislav Petkov <bp@...e.de>,
        Daniel Borkmann <daniel@...earbox.net>,
        David Woodhouse <dwmw@...zon.co.uk>,
        "H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Wang YanQing <udknight@...il.com>, dhaval.giani@...cle.com,
        srinivas.eeda@...cle.com, Ben Hutchings <ben@...adent.org.uk>
Subject: [PATCH 4.9 01/24] x86/speculation: Add RETPOLINE_AMD support to the inline asm CALL_NOSPEC variant

From: Zhenzhong Duan <zhenzhong.duan@...cle.com>

commit 0cbb76d6285794f30953bfa3ab831714b59dd700 upstream.

..so that they match their asm counterpart.

Add the missing ANNOTATE_NOSPEC_ALTERNATIVE in CALL_NOSPEC, while at it.

Signed-off-by: Zhenzhong Duan <zhenzhong.duan@...cle.com>
Signed-off-by: Borislav Petkov <bp@...e.de>
Cc: Daniel Borkmann <daniel@...earbox.net>
Cc: David Woodhouse <dwmw@...zon.co.uk>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Wang YanQing <udknight@...il.com>
Cc: dhaval.giani@...cle.com
Cc: srinivas.eeda@...cle.com
Link: http://lkml.kernel.org/r/c3975665-173e-4d70-8dee-06c926ac26ee@default
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 arch/x86/include/asm/nospec-branch.h |   17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)

--- a/arch/x86/include/asm/nospec-branch.h
+++ b/arch/x86/include/asm/nospec-branch.h
@@ -172,11 +172,15 @@
  */
 # define CALL_NOSPEC						\
 	ANNOTATE_NOSPEC_ALTERNATIVE				\
-	ALTERNATIVE(						\
+	ALTERNATIVE_2(						\
 	ANNOTATE_RETPOLINE_SAFE					\
 	"call *%[thunk_target]\n",				\
 	"call __x86_indirect_thunk_%V[thunk_target]\n",		\
-	X86_FEATURE_RETPOLINE)
+	X86_FEATURE_RETPOLINE,					\
+	"lfence;\n"						\
+	ANNOTATE_RETPOLINE_SAFE					\
+	"call *%[thunk_target]\n",				\
+	X86_FEATURE_RETPOLINE_AMD)
 # define THUNK_TARGET(addr) [thunk_target] "r" (addr)
 
 #elif defined(CONFIG_X86_32) && defined(CONFIG_RETPOLINE)
@@ -186,7 +190,8 @@
  * here, anyway.
  */
 # define CALL_NOSPEC						\
-	ALTERNATIVE(						\
+	ANNOTATE_NOSPEC_ALTERNATIVE				\
+	ALTERNATIVE_2(						\
 	ANNOTATE_RETPOLINE_SAFE					\
 	"call *%[thunk_target]\n",				\
 	"       jmp    904f;\n"					\
@@ -201,7 +206,11 @@
 	"       ret;\n"						\
 	"       .align 16\n"					\
 	"904:	call   901b;\n",				\
-	X86_FEATURE_RETPOLINE)
+	X86_FEATURE_RETPOLINE,					\
+	"lfence;\n"						\
+	ANNOTATE_RETPOLINE_SAFE					\
+	"call *%[thunk_target]\n",				\
+	X86_FEATURE_RETPOLINE_AMD)
 
 # define THUNK_TARGET(addr) [thunk_target] "rm" (addr)
 #else /* No retpoline for C / inline asm */