[PATCH 1/6] x86/nospec: JMP_NOSPEC

[Peter Zijlstra <peterz@infradead.org>]

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
---
 arch/x86/include/asm/nospec-branch.h |   24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

--- a/arch/x86/include/asm/nospec-branch.h
+++ b/arch/x86/include/asm/nospec-branch.h
@@ -438,6 +438,9 @@ static inline void call_depth_return_thu
 #define CALL_NOSPEC	__CS_PREFIX("%V[thunk_target]")	\
 			"call __x86_indirect_thunk_%V[thunk_target]\n"
 
+#define JMP_NOSPEC	__CS_PREFIX("%V[thunk_target]")	\
+			"jmp __x86_indirect_thunk_%V[thunk_target]\n"
+
 # define THUNK_TARGET(addr) [thunk_target] "r" (addr)
 
 #else /* CONFIG_X86_32 */
@@ -468,10 +471,31 @@ static inline void call_depth_return_thu
 	"call *%[thunk_target]\n",				\
 	X86_FEATURE_RETPOLINE_LFENCE)
 
+# define JMP_NOSPEC						\
+	ALTERNATIVE_2(						\
+	ANNOTATE_RETPOLINE_SAFE					\
+	"jmp *%[thunk_target]\n",				\
+	"       jmp    901f;\n"					\
+	"       .align 16\n"					\
+	"901:	call   903f;\n"					\
+	"902:	pause;\n"					\
+	"       lfence;\n"					\
+	"       jmp    902b;\n"					\
+	"       .align 16\n"					\
+	"903:	lea    4(%%esp), %%esp;\n"			\
+	"       pushl  %[thunk_target];\n"			\
+	"       ret;\n",					\
+	X86_FEATURE_RETPOLINE,					\
+	"lfence;\n"						\
+	ANNOTATE_RETPOLINE_SAFE					\
+	"jmp *%[thunk_target]\n",				\
+	X86_FEATURE_RETPOLINE_LFENCE)
+
 # define THUNK_TARGET(addr) [thunk_target] "rm" (addr)
 #endif
 #else /* No retpoline for C / inline asm */
 # define CALL_NOSPEC "call *%[thunk_target]\n"
+# define JMP_NOSPEC "jmp *%[thunk_target]\n"
 # define THUNK_TARGET(addr) [thunk_target] "rm" (addr)
 #endif