x86/spectre: Add boot time option to select Spectre v2 mitigation

[pandora-kernel.git] / arch / x86 / include / asm / nospec-branch.h

diff --git a/arch/x86/include/asm/nospec-branch.h b/arch/x86/include/asm/nospec-branch.h
index 5763548..fe48aee 100644 (file)
--- a/arch/x86/include/asm/nospec-branch.h
+++ b/arch/x86/include/asm/nospec-branch.h
@@ -102,5 +102,15 @@
 # define THUNK_TARGET(addr) [thunk_target] "rm" (addr)
 #endif
 
+/* The Spectre V2 mitigation variants */
+enum spectre_v2_mitigation {
+       SPECTRE_V2_NONE,
+       SPECTRE_V2_RETPOLINE_MINIMAL,
+       SPECTRE_V2_RETPOLINE_MINIMAL_AMD,
+       SPECTRE_V2_RETPOLINE_GENERIC,
+       SPECTRE_V2_RETPOLINE_AMD,
+       SPECTRE_V2_IBRS,
+};
+
 #endif /* __ASSEMBLY__ */
 #endif /* __NOSPEC_BRANCH_H__ */