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From: Zhenzhong Duan <zhenzhong.duan@oracle.com>
To: <linux-kernel@vger.kernel.org>
Cc: <mingo@redhat.com>, <dhaval.giani@oracle.com>,
	<konrad.wilk@oracle.com>, <x86@kernel.org>, <tglx@linutronix.de>,
	<dwmw@amazon.co.uk>, <bp@suse.de>, <srinivas.eeda@oracle.com>,
	<hpa@zytor.com>
Subject: [PATCH v2] x86/speculation: Add RETPOLINE_AMD support to the inline-asm CALL_NOSPEC
Date: Tue, 18 Sep 2018 07:45:00 -0700 (PDT)
Message-ID: <c3975665-173e-4d70-8dee-06c926ac26ee@default> (raw)

..so that they match the asm CALL_NOSPEC.

Add the missing ANNOTATE_NOSPEC_ALTERNATIVE in CALL_NOSPEC.

Signed-off-by: Zhenzhong Duan <zhenzhong.duan@oracle.com>
---
 arch/x86/include/asm/nospec-branch.h |   17 +++++++++++++----
 1 files changed, 13 insertions(+), 4 deletions(-)

diff --git a/arch/x86/include/asm/nospec-branch.h b/arch/x86/include/asm/nospec-branch.h
index b5b6f8c..b0e80e0 100644
--- a/arch/x86/include/asm/nospec-branch.h
+++ b/arch/x86/include/asm/nospec-branch.h
@@ -170,11 +170,15 @@
  */
 # 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)
@@ -184,7 +188,8 @@
  * here, anyway.
  */
 # define CALL_NOSPEC						\
-	ALTERNATIVE(						\
+	ANNOTATE_NOSPEC_ALTERNATIVE				\
+	ALTERNATIVE_2(						\
 	ANNOTATE_RETPOLINE_SAFE					\
 	"call *%[thunk_target]\n",				\
 	"       jmp    904f;\n"					\
@@ -199,7 +204,11 @@
 	"       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 */
-- 
1.7.3

             reply index

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-09-18 14:45 Zhenzhong Duan [this message]
2018-09-24 15:03 ` [tip:x86/pti] x86/speculation: Add RETPOLINE_AMD support to the inline asm CALL_NOSPEC variant tip-bot for Zhenzhong Duan

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