x86/retpoline: Cleanup some #ifdefery

On it's own not much of a cleanup but it prepares for more/similar
code.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Borislav Petkov <bp@suse.de>

diff --git a/arch/x86/include/asm/disabled-features.h b/arch/x86/include/asm/disabled-features.h
index 36369e7..4061f49 100644 (file)
--- a/arch/x86/include/asm/disabled-features.h
+++ b/arch/x86/include/asm/disabled-features.h
@@ -50,6 +50,13 @@
 # define DISABLE_PTI           (1 << (X86_FEATURE_PTI & 31))
 #endif
 
+#ifdef CONFIG_RETPOLINE
+# define DISABLE_RETPOLINE     0
+#else
+# define DISABLE_RETPOLINE     ((1 << (X86_FEATURE_RETPOLINE & 31)) | \
+                                (1 << (X86_FEATURE_RETPOLINE_LFENCE & 31)))
+#endif
+
 #ifdef CONFIG_INTEL_IOMMU_SVM
 # define DISABLE_ENQCMD                0
 #else
@@ -82,7 +89,7 @@
 #define DISABLED_MASK8 (DISABLE_TDX_GUEST)
 #define DISABLED_MASK9 (DISABLE_SGX)
 #define DISABLED_MASK10        0
-#define DISABLED_MASK11        0
+#define DISABLED_MASK11        (DISABLE_RETPOLINE)
 #define DISABLED_MASK12        0
 #define DISABLED_MASK13        0
 #define DISABLED_MASK14        0

diff --git a/arch/x86/include/asm/nospec-branch.h b/arch/x86/include/asm/nospec-branch.h
index da251a5..5728539 100644 (file)
--- a/arch/x86/include/asm/nospec-branch.h
+++ b/arch/x86/include/asm/nospec-branch.h
@@ -120,17 +120,16 @@
        _ASM_PTR " 999b\n\t"                                    \
        ".popsection\n\t"
 
-#ifdef CONFIG_RETPOLINE
-
 typedef u8 retpoline_thunk_t[RETPOLINE_THUNK_SIZE];
+extern retpoline_thunk_t __x86_indirect_thunk_array[];
+
+#ifdef CONFIG_RETPOLINE
 
 #define GEN(reg) \
        extern retpoline_thunk_t __x86_indirect_thunk_ ## reg;
 #include <asm/GEN-for-each-reg.h>
 #undef GEN
 
-extern retpoline_thunk_t __x86_indirect_thunk_array[];
-
 #ifdef CONFIG_X86_64
 
 /*

diff --git a/arch/x86/net/bpf_jit_comp.c b/arch/x86/net/bpf_jit_comp.c
index c98b8c0..79d2690 100644 (file)
--- a/arch/x86/net/bpf_jit_comp.c
+++ b/arch/x86/net/bpf_jit_comp.c
@@ -412,16 +412,15 @@ static void emit_indirect_jump(u8 **pprog, int reg, u8 *ip)
 {
        u8 *prog = *pprog;
 
-#ifdef CONFIG_RETPOLINE
        if (cpu_feature_enabled(X86_FEATURE_RETPOLINE_LFENCE)) {
                EMIT_LFENCE();
                EMIT2(0xFF, 0xE0 + reg);
        } else if (cpu_feature_enabled(X86_FEATURE_RETPOLINE)) {
                OPTIMIZER_HIDE_VAR(reg);
                emit_jump(&prog, &__x86_indirect_thunk_array[reg], ip);
-       } else
-#endif
-       EMIT2(0xFF, 0xE0 + reg);
+       } else {
+               EMIT2(0xFF, 0xE0 + reg);
+       }
 
        *pprog = prog;
 }