x86/bugs: Rename CONFIG_CPU_SRSO => CONFIG_MITIGATION_SRSO

Step 9/10 of the namespace unification of CPU mitigations related Kconfig options.
Suggested-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Breno Leitao <leitao@debian.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Josh Poimboeuf <jpoimboe@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: https://lore.kernel.org/r/20231121160740.1249350-10-leitao@debian.org

arch/x86/Kconfig

@@ -2570,7 +2570,7 @@ config MITIGATION_IBRS_ENTRY
 	  This mitigates both spectre_v2 and retbleed at great cost to
 	  performance.
 
-config CPU_SRSO
+config MITIGATION_SRSO
 	bool "Mitigate speculative RAS overflow on AMD"
 	depends on CPU_SUP_AMD && X86_64 && RETHUNK
 	default y

arch/x86/include/asm/nospec-branch.h

@@ -212,7 +212,7 @@
  */
 .macro VALIDATE_UNRET_END
 #if defined(CONFIG_NOINSTR_VALIDATION) && \
-	(defined(CONFIG_MITIGATION_UNRET_ENTRY) || defined(CONFIG_CPU_SRSO))
+	(defined(CONFIG_MITIGATION_UNRET_ENTRY) || defined(CONFIG_MITIGATION_SRSO))
 	ANNOTATE_RETPOLINE_SAFE
 	nop
 #endif
@@ -271,7 +271,7 @@
 .Lskip_rsb_\@:
 .endm
 
-#if defined(CONFIG_MITIGATION_UNRET_ENTRY) || defined(CONFIG_CPU_SRSO)
+#if defined(CONFIG_MITIGATION_UNRET_ENTRY) || defined(CONFIG_MITIGATION_SRSO)
 #define CALL_UNTRAIN_RET	"call entry_untrain_ret"
 #else
 #define CALL_UNTRAIN_RET	""
@@ -340,7 +340,7 @@ extern void retbleed_return_thunk(void);
 static inline void retbleed_return_thunk(void) {}
 #endif
 
-#ifdef CONFIG_CPU_SRSO
+#ifdef CONFIG_MITIGATION_SRSO
 extern void srso_return_thunk(void);
 extern void srso_alias_return_thunk(void);
 #else

arch/x86/kernel/cpu/bugs.c

@@ -2458,7 +2458,7 @@ static void __init srso_select_mitigation(void)
 		break;
 
 	case SRSO_CMD_SAFE_RET:
-		if (IS_ENABLED(CONFIG_CPU_SRSO)) {
+		if (IS_ENABLED(CONFIG_MITIGATION_SRSO)) {
 			/*
 			 * Enable the return thunk for generated code
 			 * like ftrace, static_call, etc.
@@ -2478,7 +2478,7 @@ static void __init srso_select_mitigation(void)
 			else
 				srso_mitigation = SRSO_MITIGATION_SAFE_RET_UCODE_NEEDED;
 		} else {
-			pr_err("WARNING: kernel not compiled with CPU_SRSO.\n");
+			pr_err("WARNING: kernel not compiled with MITIGATION_SRSO.\n");
 		}
 		break;
 
@@ -2494,13 +2494,13 @@ static void __init srso_select_mitigation(void)
 		break;
 
 	case SRSO_CMD_IBPB_ON_VMEXIT:
-		if (IS_ENABLED(CONFIG_CPU_SRSO)) {
+		if (IS_ENABLED(CONFIG_MITIGATION_SRSO)) {
 			if (!boot_cpu_has(X86_FEATURE_ENTRY_IBPB) && has_microcode) {
 				setup_force_cpu_cap(X86_FEATURE_IBPB_ON_VMEXIT);
 				srso_mitigation = SRSO_MITIGATION_IBPB_ON_VMEXIT;
 			}
 		} else {
-			pr_err("WARNING: kernel not compiled with CPU_SRSO.\n");
+			pr_err("WARNING: kernel not compiled with MITIGATION_SRSO.\n");
                 }
 		break;
 	}

arch/x86/kernel/vmlinux.lds.S

@@ -142,7 +142,7 @@ SECTIONS
 		*(.text..__x86.rethunk_untrain)
 		ENTRY_TEXT
 
-#ifdef CONFIG_CPU_SRSO
+#ifdef CONFIG_MITIGATION_SRSO
 		/*
 		 * See the comment above srso_alias_untrain_ret()'s
 		 * definition.
@@ -508,7 +508,7 @@ INIT_PER_CPU(irq_stack_backing_store);
 . = ASSERT((retbleed_return_thunk & 0x3f) == 0, "retbleed_return_thunk not cacheline-aligned");
 #endif
 
-#ifdef CONFIG_CPU_SRSO
+#ifdef CONFIG_MITIGATION_SRSO
 . = ASSERT((srso_safe_ret & 0x3f) == 0, "srso_safe_ret not cacheline-aligned");
 /*
  * GNU ld cannot do XOR until 2.41.

arch/x86/lib/retpoline.S

@@ -138,7 +138,7 @@ SYM_CODE_END(__x86_indirect_jump_thunk_array)
  */
 	.section .text..__x86.return_thunk
 
-#ifdef CONFIG_CPU_SRSO
+#ifdef CONFIG_MITIGATION_SRSO
 
 /*
  * srso_alias_untrain_ret() and srso_alias_safe_ret() are placed at
@@ -225,10 +225,10 @@ SYM_CODE_END(srso_return_thunk)
 
 #define JMP_SRSO_UNTRAIN_RET "jmp srso_untrain_ret"
 #define JMP_SRSO_ALIAS_UNTRAIN_RET "jmp srso_alias_untrain_ret"
-#else /* !CONFIG_CPU_SRSO */
+#else /* !CONFIG_MITIGATION_SRSO */
 #define JMP_SRSO_UNTRAIN_RET "ud2"
 #define JMP_SRSO_ALIAS_UNTRAIN_RET "ud2"
-#endif /* CONFIG_CPU_SRSO */
+#endif /* CONFIG_MITIGATION_SRSO */
 
 #ifdef CONFIG_MITIGATION_UNRET_ENTRY
 
@@ -316,7 +316,7 @@ SYM_FUNC_END(retbleed_untrain_ret)
 #define JMP_RETBLEED_UNTRAIN_RET "ud2"
 #endif /* CONFIG_MITIGATION_UNRET_ENTRY */
 
-#if defined(CONFIG_MITIGATION_UNRET_ENTRY) || defined(CONFIG_CPU_SRSO)
+#if defined(CONFIG_MITIGATION_UNRET_ENTRY) || defined(CONFIG_MITIGATION_SRSO)
 
 SYM_FUNC_START(entry_untrain_ret)
 	ALTERNATIVE_2 JMP_RETBLEED_UNTRAIN_RET,				\
@@ -325,7 +325,7 @@ SYM_FUNC_START(entry_untrain_ret)
 SYM_FUNC_END(entry_untrain_ret)
 __EXPORT_THUNK(entry_untrain_ret)
 
-#endif /* CONFIG_MITIGATION_UNRET_ENTRY || CONFIG_CPU_SRSO */
+#endif /* CONFIG_MITIGATION_UNRET_ENTRY || CONFIG_MITIGATION_SRSO */
 
 #ifdef CONFIG_MITIGATION_CALL_DEPTH_TRACKING
 

include/linux/objtool.h

@@ -131,7 +131,7 @@
  */
 .macro VALIDATE_UNRET_BEGIN
 #if defined(CONFIG_NOINSTR_VALIDATION) && \
-	(defined(CONFIG_MITIGATION_UNRET_ENTRY) || defined(CONFIG_CPU_SRSO))
+	(defined(CONFIG_MITIGATION_UNRET_ENTRY) || defined(CONFIG_MITIGATION_SRSO))
 .Lhere_\@:
 	.pushsection .discard.validate_unret
 	.long	.Lhere_\@ - .

scripts/Makefile.vmlinux_o

@@ -38,7 +38,7 @@ objtool-enabled := $(or $(delay-objtool),$(CONFIG_NOINSTR_VALIDATION))
 vmlinux-objtool-args-$(delay-objtool)			+= $(objtool-args-y)
 vmlinux-objtool-args-$(CONFIG_GCOV_KERNEL)		+= --no-unreachable
 vmlinux-objtool-args-$(CONFIG_NOINSTR_VALIDATION)	+= --noinstr \
-							   $(if $(or $(CONFIG_MITIGATION_UNRET_ENTRY),$(CONFIG_CPU_SRSO)), --unret)
+							   $(if $(or $(CONFIG_MITIGATION_UNRET_ENTRY),$(CONFIG_MITIGATION_SRSO)), --unret)
 
 objtool-args = $(vmlinux-objtool-args-y) --link