Patch "x86/bugs: Replace CONFIG_SPECTRE_BHI_{ON,OFF} with CONFIG_MITIGATION_SPECTRE_BHI" has been added to the 6.6-stable tree

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This is a note to let you know that I've just added the patch titled

    x86/bugs: Replace CONFIG_SPECTRE_BHI_{ON,OFF} with CONFIG_MITIGATION_SPECTRE_BHI

to the 6.6-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     x86-bugs-replace-config_spectre_bhi_-on-off-with-config_mitigation_spectre_bhi.patch
and it can be found in the queue-6.6 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From 4f511739c54b549061993b53fc0380f48dfca23b Mon Sep 17 00:00:00 2001
From: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>
Date: Wed, 10 Apr 2024 22:40:51 -0700
Subject: x86/bugs: Replace CONFIG_SPECTRE_BHI_{ON,OFF} with CONFIG_MITIGATION_SPECTRE_BHI

From: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>

commit 4f511739c54b549061993b53fc0380f48dfca23b upstream.

For consistency with the other CONFIG_MITIGATION_* options, replace the
CONFIG_SPECTRE_BHI_{ON,OFF} options with a single
CONFIG_MITIGATION_SPECTRE_BHI option.

[ mingo: Fix ]

Signed-off-by: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Sean Christopherson <seanjc@xxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Nikolay Borisov <nik.borisov@xxxxxxxx>
Link: https://lore.kernel.org/r/3833812ea63e7fdbe36bf8b932e63f70d18e2a2a.1712813475.git.jpoimboe@xxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 arch/x86/Kconfig           |   17 +++--------------
 arch/x86/kernel/cpu/bugs.c |    2 +-
 2 files changed, 4 insertions(+), 15 deletions(-)

--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -2566,27 +2566,16 @@ config MITIGATION_RFDS
 	  stored in floating point, vector and integer registers.
 	  See also <file:Documentation/admin-guide/hw-vuln/reg-file-data-sampling.rst>
 
-choice
-	prompt "Clear branch history"
+config MITIGATION_SPECTRE_BHI
+	bool "Mitigate Spectre-BHB (Branch History Injection)"
 	depends on CPU_SUP_INTEL
-	default SPECTRE_BHI_ON
+	default y
 	help
 	  Enable BHI mitigations. BHI attacks are a form of Spectre V2 attacks
 	  where the branch history buffer is poisoned to speculatively steer
 	  indirect branches.
 	  See <file:Documentation/admin-guide/hw-vuln/spectre.rst>
 
-config SPECTRE_BHI_ON
-	bool "on"
-	help
-	  Equivalent to setting spectre_bhi=on command line parameter.
-config SPECTRE_BHI_OFF
-	bool "off"
-	help
-	  Equivalent to setting spectre_bhi=off command line parameter.
-
-endchoice
-
 endif
 
 config ARCH_HAS_ADD_PAGES
--- a/arch/x86/kernel/cpu/bugs.c
+++ b/arch/x86/kernel/cpu/bugs.c
@@ -1627,7 +1627,7 @@ enum bhi_mitigations {
 };
 
 static enum bhi_mitigations bhi_mitigation __ro_after_init =
-	IS_ENABLED(CONFIG_SPECTRE_BHI_ON) ? BHI_MITIGATION_ON : BHI_MITIGATION_OFF;
+	IS_ENABLED(CONFIG_MITIGATION_SPECTRE_BHI) ? BHI_MITIGATION_ON : BHI_MITIGATION_OFF;
 
 static int __init spectre_bhi_parse_cmdline(char *str)
 {


Patches currently in stable-queue which might be from jpoimboe@xxxxxxxxxx are

queue-6.6/x86-bugs-fix-bhi-documentation.patch
queue-6.6/x86-bugs-cache-the-value-of-msr_ia32_arch_capabilities.patch
queue-6.6/x86-bugs-remove-config_bhi_mitigation_auto-and-spectre_bhi-auto.patch
queue-6.6/x86-bugs-replace-config_spectre_bhi_-on-off-with-config_mitigation_spectre_bhi.patch
queue-6.6/x86-bugs-rename-various-ia32_cap-variables-to-x86_arch_cap_msr.patch
queue-6.6/x86-bugs-clarify-that-syscall-hardening-isn-t-a-bhi-mitigation.patch
queue-6.6/x86-bugs-fix-bhi-handling-of-rrsba.patch




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