[PATCH 1/4] x86/srso: Rename srso_alias_*() to srso_fam19_*()

[Andrew Cooper <andrew.cooper3@citrix.com>]

The 'alias' name name is an internal detail of how the logic works.  Rename it
to state which microarchitecture is is applicable to.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
---
CC: x86@kernel.org
CC: linux-kernel@vger.kernel.org
CC: Borislav Petkov <bp@alien8.de>
CC: Peter Zijlstra <peterz@infradead.org>
CC: Josh Poimboeuf <jpoimboe@kernel.org>
CC: Babu Moger <babu.moger@amd.com>
CC: David.Kaplan@amd.com
CC: Nikolay Borisov <nik.borisov@suse.com>
CC: gregkh@linuxfoundation.org
CC: Thomas Gleixner <tglx@linutronix.de>
---
 arch/x86/include/asm/nospec-branch.h |  4 ++--
 arch/x86/kernel/cpu/bugs.c           |  2 +-
 arch/x86/kernel/vmlinux.lds.S        |  8 +++----
 arch/x86/lib/retpoline.S             | 34 ++++++++++++++--------------
 4 files changed, 24 insertions(+), 24 deletions(-)

diff --git a/arch/x86/include/asm/nospec-branch.h b/arch/x86/include/asm/nospec-branch.h
index c55cc243592e..93e8de0bf94e 100644
--- a/arch/x86/include/asm/nospec-branch.h
+++ b/arch/x86/include/asm/nospec-branch.h
@@ -350,11 +350,11 @@ static inline void __x86_return_thunk(void) {}
 
 extern void retbleed_return_thunk(void);
 extern void srso_return_thunk(void);
-extern void srso_alias_return_thunk(void);
+extern void srso_fam19_return_thunk(void);
 
 extern void retbleed_untrain_ret(void);
 extern void srso_untrain_ret(void);
-extern void srso_alias_untrain_ret(void);
+extern void srso_fam19_untrain_ret(void);
 
 extern void entry_untrain_ret(void);
 extern void entry_ibpb(void);
diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c
index f081d26616ac..92bec0d719ce 100644
--- a/arch/x86/kernel/cpu/bugs.c
+++ b/arch/x86/kernel/cpu/bugs.c
@@ -2464,7 +2464,7 @@ static void __init srso_select_mitigation(void)
 
 			if (boot_cpu_data.x86 == 0x19) {
 				setup_force_cpu_cap(X86_FEATURE_SRSO_ALIAS);
-				x86_return_thunk = srso_alias_return_thunk;
+				x86_return_thunk = srso_fam19_return_thunk;
 			} else {
 				setup_force_cpu_cap(X86_FEATURE_SRSO);
 				x86_return_thunk = srso_return_thunk;
diff --git a/arch/x86/kernel/vmlinux.lds.S b/arch/x86/kernel/vmlinux.lds.S
index 83d41c2601d7..c9b6f8b83187 100644
--- a/arch/x86/kernel/vmlinux.lds.S
+++ b/arch/x86/kernel/vmlinux.lds.S
@@ -147,10 +147,10 @@ SECTIONS
 
 #ifdef CONFIG_CPU_SRSO
 		/*
-		 * See the comment above srso_alias_untrain_ret()'s
+		 * See the comment above srso_fam19_untrain_ret()'s
 		 * definition.
 		 */
-		. = srso_alias_untrain_ret | (1 << 2) | (1 << 8) | (1 << 14) | (1 << 20);
+		. = srso_fam19_untrain_ret | (1 << 2) | (1 << 8) | (1 << 14) | (1 << 20);
 		*(.text..__x86.rethunk_safe)
 #endif
 		ALIGN_ENTRY_TEXT_END
@@ -536,8 +536,8 @@ INIT_PER_CPU(irq_stack_backing_store);
  * Instead do: (A | B) - (A & B) in order to compute the XOR
  * of the two function addresses:
  */
-. = ASSERT(((ABSOLUTE(srso_alias_untrain_ret) | srso_alias_safe_ret) -
-		(ABSOLUTE(srso_alias_untrain_ret) & srso_alias_safe_ret)) == ((1 << 2) | (1 << 8) | (1 << 14) | (1 << 20)),
+. = ASSERT(((ABSOLUTE(srso_fam19_untrain_ret) | srso_fam19_safe_ret) -
+		(ABSOLUTE(srso_fam19_untrain_ret) & srso_fam19_safe_ret)) == ((1 << 2) | (1 << 8) | (1 << 14) | (1 << 20)),
 		"SRSO function pair won't alias");
 #endif
 
diff --git a/arch/x86/lib/retpoline.S b/arch/x86/lib/retpoline.S
index cd86aeb5fdd3..772757ea26a7 100644
--- a/arch/x86/lib/retpoline.S
+++ b/arch/x86/lib/retpoline.S
@@ -133,58 +133,58 @@ SYM_CODE_END(__x86_indirect_jump_thunk_array)
 #ifdef CONFIG_RETHUNK
 
 /*
- * srso_alias_untrain_ret() and srso_alias_safe_ret() are placed at
+ * srso_fam19_untrain_ret() and srso_fam19_safe_ret() are placed at
  * special addresses:
  *
- * - srso_alias_untrain_ret() is 2M aligned
- * - srso_alias_safe_ret() is also in the same 2M page but bits 2, 8, 14
+ * - srso_fam19_untrain_ret() is 2M aligned
+ * - srso_fam19_safe_ret() is also in the same 2M page but bits 2, 8, 14
  * and 20 in its virtual address are set (while those bits in the
- * srso_alias_untrain_ret() function are cleared).
+ * srso_fam19_untrain_ret() function are cleared).
  *
  * This guarantees that those two addresses will alias in the branch
  * target buffer of Zen3/4 generations, leading to any potential
  * poisoned entries at that BTB slot to get evicted.
  *
- * As a result, srso_alias_safe_ret() becomes a safe return.
+ * As a result, srso_fam19_safe_ret() becomes a safe return.
  */
 #ifdef CONFIG_CPU_SRSO
 	.section .text..__x86.rethunk_untrain
 
-SYM_START(srso_alias_untrain_ret, SYM_L_GLOBAL, SYM_A_NONE)
+SYM_START(srso_fam19_untrain_ret, SYM_L_GLOBAL, SYM_A_NONE)
 	UNWIND_HINT_FUNC
 	ANNOTATE_NOENDBR
 	ASM_NOP2
 	lfence
-	jmp srso_alias_return_thunk
-SYM_FUNC_END(srso_alias_untrain_ret)
-__EXPORT_THUNK(srso_alias_untrain_ret)
+	jmp srso_fam19_return_thunk
+SYM_FUNC_END(srso_fam19_untrain_ret)
+__EXPORT_THUNK(srso_fam19_untrain_ret)
 
 	.section .text..__x86.rethunk_safe
 #else
 /* dummy definition for alternatives */
-SYM_START(srso_alias_untrain_ret, SYM_L_GLOBAL, SYM_A_NONE)
+SYM_START(srso_fam19_untrain_ret, SYM_L_GLOBAL, SYM_A_NONE)
 	ANNOTATE_UNRET_SAFE
 	ret
 	int3
-SYM_FUNC_END(srso_alias_untrain_ret)
+SYM_FUNC_END(srso_fam19_untrain_ret)
 #endif
 
-SYM_START(srso_alias_safe_ret, SYM_L_GLOBAL, SYM_A_NONE)
+SYM_START(srso_fam19_safe_ret, SYM_L_GLOBAL, SYM_A_NONE)
 	lea 8(%_ASM_SP), %_ASM_SP
 	UNWIND_HINT_FUNC
 	ANNOTATE_UNRET_SAFE
 	ret
 	int3
-SYM_FUNC_END(srso_alias_safe_ret)
+SYM_FUNC_END(srso_fam19_safe_ret)
 
 	.section .text..__x86.return_thunk
 
-SYM_CODE_START(srso_alias_return_thunk)
+SYM_CODE_START(srso_fam19_return_thunk)
 	UNWIND_HINT_FUNC
 	ANNOTATE_NOENDBR
-	call srso_alias_safe_ret
+	call srso_fam19_safe_ret
 	ud2
-SYM_CODE_END(srso_alias_return_thunk)
+SYM_CODE_END(srso_fam19_return_thunk)
 
 /*
  * Some generic notes on the untraining sequences:
@@ -311,7 +311,7 @@ SYM_CODE_END(srso_return_thunk)
 SYM_FUNC_START(entry_untrain_ret)
 	ALTERNATIVE_2 "jmp retbleed_untrain_ret", \
 		      "jmp srso_untrain_ret", X86_FEATURE_SRSO, \
-		      "jmp srso_alias_untrain_ret", X86_FEATURE_SRSO_ALIAS
+		      "jmp srso_fam19_untrain_ret", X86_FEATURE_SRSO_ALIAS
 SYM_FUNC_END(entry_untrain_ret)
 __EXPORT_THUNK(entry_untrain_ret)
 
-- 
2.30.2