[tip: x86/bugs] x86/bugs: Rename CONFIG_CPU_UNRET_ENTRY => CONFIG_MITIGATION_UNRET_ENTRY

From: tip-bot2 for Breno Leitao
Date: Wed Jan 10 2024 - 05:10:24 EST

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The following commit has been merged into the x86/bugs branch of tip:

Commit-ID: ac61d43983a4fe8e3ee600eee44c40868c14340a
Gitweb: https://git.kernel.org/tip/ac61d43983a4fe8e3ee600eee44c40868c14340a
Author: Breno Leitao <leitao@xxxxxxxxxx>
AuthorDate: Tue, 21 Nov 2023 08:07:34 -08:00
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitterDate: Wed, 10 Jan 2024 10:52:28 +01:00

x86/bugs: Rename CONFIG_CPU_UNRET_ENTRY => CONFIG_MITIGATION_UNRET_ENTRY

Step 7/10 of the namespace unification of CPU mitigations related Kconfig options.

Suggested-by: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>
Signed-off-by: Breno Leitao <leitao@xxxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
Acked-by: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20231121160740.1249350-8-leitao@xxxxxxxxxx
---
arch/x86/Kconfig | 2 +-
arch/x86/include/asm/disabled-features.h | 2 +-
arch/x86/include/asm/nospec-branch.h | 6 +++---
arch/x86/kernel/cpu/amd.c | 2 +-
arch/x86/kernel/cpu/bugs.c | 6 +++---
arch/x86/kernel/vmlinux.lds.S | 2 +-
arch/x86/lib/retpoline.S | 10 +++++-----
include/linux/objtool.h | 2 +-
scripts/Makefile.vmlinux_o | 2 +-
tools/arch/x86/include/asm/disabled-features.h | 2 +-
10 files changed, 18 insertions(+), 18 deletions(-)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index ba45465..77b8769 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -2516,7 +2516,7 @@ config RETHUNK
Requires a compiler with -mfunction-return=thunk-extern
support for full protection. The kernel may run slower.

-config CPU_UNRET_ENTRY
+config MITIGATION_UNRET_ENTRY
bool "Enable UNRET on kernel entry"
depends on CPU_SUP_AMD && RETHUNK && X86_64
default y
diff --git a/arch/x86/include/asm/disabled-features.h b/arch/x86/include/asm/disabled-features.h
index 24e4010..151f0d5 100644
--- a/arch/x86/include/asm/disabled-features.h
+++ b/arch/x86/include/asm/disabled-features.h
@@ -63,7 +63,7 @@
# define DISABLE_RETHUNK (1 << (X86_FEATURE_RETHUNK & 31))
#endif

-#ifdef CONFIG_CPU_UNRET_ENTRY
+#ifdef CONFIG_MITIGATION_UNRET_ENTRY
# define DISABLE_UNRET 0
#else
# define DISABLE_UNRET (1 << (X86_FEATURE_UNRET & 31))
diff --git a/arch/x86/include/asm/nospec-branch.h b/arch/x86/include/asm/nospec-branch.h
index 32680cb..9747869 100644
--- a/arch/x86/include/asm/nospec-branch.h
+++ b/arch/x86/include/asm/nospec-branch.h
@@ -212,7 +212,7 @@
*/
.macro VALIDATE_UNRET_END
#if defined(CONFIG_NOINSTR_VALIDATION) && \
- (defined(CONFIG_CPU_UNRET_ENTRY) || defined(CONFIG_CPU_SRSO))
+ (defined(CONFIG_MITIGATION_UNRET_ENTRY) || defined(CONFIG_CPU_SRSO))
ANNOTATE_RETPOLINE_SAFE
nop
#endif
@@ -271,7 +271,7 @@
.Lskip_rsb_\@:
.endm

-#if defined(CONFIG_CPU_UNRET_ENTRY) || defined(CONFIG_CPU_SRSO)
+#if defined(CONFIG_MITIGATION_UNRET_ENTRY) || defined(CONFIG_CPU_SRSO)
#define CALL_UNTRAIN_RET "call entry_untrain_ret"
#else
#define CALL_UNTRAIN_RET ""
@@ -334,7 +334,7 @@ extern void __x86_return_thunk(void);
static inline void __x86_return_thunk(void) {}
#endif

-#ifdef CONFIG_CPU_UNRET_ENTRY
+#ifdef CONFIG_MITIGATION_UNRET_ENTRY
extern void retbleed_return_thunk(void);
#else
static inline void retbleed_return_thunk(void) {}
diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c
index 9f42d1c..6c7db2e 100644
--- a/arch/x86/kernel/cpu/amd.c
+++ b/arch/x86/kernel/cpu/amd.c
@@ -928,7 +928,7 @@ static void fix_erratum_1386(struct cpuinfo_x86 *c)

void init_spectral_chicken(struct cpuinfo_x86 *c)
{
-#ifdef CONFIG_CPU_UNRET_ENTRY
+#ifdef CONFIG_MITIGATION_UNRET_ENTRY
u64 value;

/*
diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c
index fc46fd6..2580368 100644
--- a/arch/x86/kernel/cpu/bugs.c
+++ b/arch/x86/kernel/cpu/bugs.c
@@ -982,10 +982,10 @@ static void __init retbleed_select_mitigation(void)
return;

case RETBLEED_CMD_UNRET:
- if (IS_ENABLED(CONFIG_CPU_UNRET_ENTRY)) {
+ if (IS_ENABLED(CONFIG_MITIGATION_UNRET_ENTRY)) {
retbleed_mitigation = RETBLEED_MITIGATION_UNRET;
} else {
- pr_err("WARNING: kernel not compiled with CPU_UNRET_ENTRY.\n");
+ pr_err("WARNING: kernel not compiled with MITIGATION_UNRET_ENTRY.\n");
goto do_cmd_auto;
}
break;
@@ -1021,7 +1021,7 @@ do_cmd_auto:
case RETBLEED_CMD_AUTO:
if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD ||
boot_cpu_data.x86_vendor == X86_VENDOR_HYGON) {
- if (IS_ENABLED(CONFIG_CPU_UNRET_ENTRY))
+ if (IS_ENABLED(CONFIG_MITIGATION_UNRET_ENTRY))
retbleed_mitigation = RETBLEED_MITIGATION_UNRET;
else if (IS_ENABLED(CONFIG_MITIGATION_IBPB_ENTRY) &&
boot_cpu_has(X86_FEATURE_IBPB))
diff --git a/arch/x86/kernel/vmlinux.lds.S b/arch/x86/kernel/vmlinux.lds.S
index bb2ec03..9c5cca5 100644
--- a/arch/x86/kernel/vmlinux.lds.S
+++ b/arch/x86/kernel/vmlinux.lds.S
@@ -504,7 +504,7 @@ INIT_PER_CPU(irq_stack_backing_store);
"fixed_percpu_data is not at start of per-cpu area");
#endif

-#ifdef CONFIG_CPU_UNRET_ENTRY
+#ifdef CONFIG_MITIGATION_UNRET_ENTRY
. = ASSERT((retbleed_return_thunk & 0x3f) == 0, "retbleed_return_thunk not cacheline-aligned");
#endif

diff --git a/arch/x86/lib/retpoline.S b/arch/x86/lib/retpoline.S
index ff46f48..0ad67cc 100644
--- a/arch/x86/lib/retpoline.S
+++ b/arch/x86/lib/retpoline.S
@@ -230,7 +230,7 @@ SYM_CODE_END(srso_return_thunk)
#define JMP_SRSO_ALIAS_UNTRAIN_RET "ud2"
#endif /* CONFIG_CPU_SRSO */

-#ifdef CONFIG_CPU_UNRET_ENTRY
+#ifdef CONFIG_MITIGATION_UNRET_ENTRY

/*
* Some generic notes on the untraining sequences:
@@ -312,11 +312,11 @@ SYM_CODE_END(retbleed_return_thunk)
SYM_FUNC_END(retbleed_untrain_ret)

#define JMP_RETBLEED_UNTRAIN_RET "jmp retbleed_untrain_ret"
-#else /* !CONFIG_CPU_UNRET_ENTRY */
+#else /* !CONFIG_MITIGATION_UNRET_ENTRY */
#define JMP_RETBLEED_UNTRAIN_RET "ud2"
-#endif /* CONFIG_CPU_UNRET_ENTRY */
+#endif /* CONFIG_MITIGATION_UNRET_ENTRY */

-#if defined(CONFIG_CPU_UNRET_ENTRY) || defined(CONFIG_CPU_SRSO)
+#if defined(CONFIG_MITIGATION_UNRET_ENTRY) || defined(CONFIG_CPU_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_CPU_UNRET_ENTRY || CONFIG_CPU_SRSO */
+#endif /* CONFIG_MITIGATION_UNRET_ENTRY || CONFIG_CPU_SRSO */

#ifdef CONFIG_MITIGATION_CALL_DEPTH_TRACKING

diff --git a/include/linux/objtool.h b/include/linux/objtool.h
index 33212e9..d030671 100644
--- a/include/linux/objtool.h
+++ b/include/linux/objtool.h
@@ -131,7 +131,7 @@
*/
.macro VALIDATE_UNRET_BEGIN
#if defined(CONFIG_NOINSTR_VALIDATION) && \
- (defined(CONFIG_CPU_UNRET_ENTRY) || defined(CONFIG_CPU_SRSO))
+ (defined(CONFIG_MITIGATION_UNRET_ENTRY) || defined(CONFIG_CPU_SRSO))
.Lhere_\@:
.pushsection .discard.validate_unret
.long .Lhere_\@ - .
diff --git a/scripts/Makefile.vmlinux_o b/scripts/Makefile.vmlinux_o
index 25b3b58..6277dbd 100644
--- a/scripts/Makefile.vmlinux_o
+++ b/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 $(CONFIG_CPU_UNRET_ENTRY),$(CONFIG_CPU_SRSO)), --unret)
+ $(if $(or $(CONFIG_MITIGATION_UNRET_ENTRY),$(CONFIG_CPU_SRSO)), --unret)

objtool-args = $(vmlinux-objtool-args-y) --link

diff --git a/tools/arch/x86/include/asm/disabled-features.h b/tools/arch/x86/include/asm/disabled-features.h
index 24e4010..151f0d5 100644
--- a/tools/arch/x86/include/asm/disabled-features.h
+++ b/tools/arch/x86/include/asm/disabled-features.h
@@ -63,7 +63,7 @@
# define DISABLE_RETHUNK (1 << (X86_FEATURE_RETHUNK & 31))
#endif

-#ifdef CONFIG_CPU_UNRET_ENTRY
+#ifdef CONFIG_MITIGATION_UNRET_ENTRY
# define DISABLE_UNRET 0
#else
# define DISABLE_UNRET (1 << (X86_FEATURE_UNRET & 31))

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