Patch "x86/srso: Correct the mitigation status when SMT is disabled" has been added to the 6.4-stable tree

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

    x86/srso: Correct the mitigation status when SMT is disabled

to the 6.4-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-srso-correct-the-mitigation-status-when-smt-is-disabled.patch
and it can be found in the queue-6.4 subdirectory.

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


>From 6405b72e8d17bd1875a56ae52d23ec3cd51b9d66 Mon Sep 17 00:00:00 2001
From: "Borislav Petkov (AMD)" <bp@xxxxxxxxx>
Date: Tue, 15 Aug 2023 11:53:13 +0200
Subject: x86/srso: Correct the mitigation status when SMT is disabled

From: Borislav Petkov (AMD) <bp@xxxxxxxxx>

commit 6405b72e8d17bd1875a56ae52d23ec3cd51b9d66 upstream.

Specify how is SRSO mitigated when SMT is disabled. Also, correct the
SMT check for that.

Fixes: e9fbc47b818b ("x86/srso: Disable the mitigation on unaffected configurations")
Suggested-by: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>
Signed-off-by: Borislav Petkov (AMD) <bp@xxxxxxxxx>
Acked-by: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20230814200813.p5czl47zssuej7nv@treble
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 arch/x86/kernel/cpu/bugs.c |    5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

--- a/arch/x86/kernel/cpu/bugs.c
+++ b/arch/x86/kernel/cpu/bugs.c
@@ -2428,8 +2428,7 @@ static void __init srso_select_mitigatio
 		 * Zen1/2 with SMT off aren't vulnerable after the right
 		 * IBPB microcode has been applied.
 		 */
-		if ((boot_cpu_data.x86 < 0x19) &&
-		    (!cpu_smt_possible() || (cpu_smt_control == CPU_SMT_DISABLED))) {
+		if (boot_cpu_data.x86 < 0x19 && !cpu_smt_possible()) {
 			setup_force_cpu_cap(X86_FEATURE_SRSO_NO);
 			return;
 		}
@@ -2719,7 +2718,7 @@ static ssize_t gds_show_state(char *buf)
 static ssize_t srso_show_state(char *buf)
 {
 	if (boot_cpu_has(X86_FEATURE_SRSO_NO))
-		return sysfs_emit(buf, "Not affected\n");
+		return sysfs_emit(buf, "Mitigation: SMT disabled\n");
 
 	return sysfs_emit(buf, "%s%s\n",
 			  srso_strings[srso_mitigation],


Patches currently in stable-queue which might be from bp@xxxxxxxxx are

queue-6.4/x86-cpu-fix-up-srso_safe_ret-and-__x86_return_thunk.patch
queue-6.4/x86-cpu-cleanup-the-untrain-mess.patch
queue-6.4/objtool-x86-fixup-frame-pointer-vs-rethunk.patch
queue-6.4/x86-retpoline-kprobes-skip-optprobe-check-for-indirect-jumps-with-retpolines-and-ibt.patch
queue-6.4/x86-srso-correct-the-mitigation-status-when-smt-is-disabled.patch
queue-6.4/x86-retpoline-don-t-clobber-rflags-during-srso_safe_ret.patch
queue-6.4/x86-retpoline-kprobes-fix-position-of-thunk-sections-with-config_lto_clang.patch
queue-6.4/x86-cpu-kvm-provide-untrain_ret_vm.patch
queue-6.4/x86-cpu-amd-fix-the-div-0-initial-fix-attempt.patch
queue-6.4/x86-cpu-rename-srso_-.-_alias-to-srso_alias_-1.patch
queue-6.4/x86-srso-explain-the-untraining-sequences-a-bit-more.patch
queue-6.4/x86-alternative-make-custom-return-thunk-unconditional.patch
queue-6.4/x86-cpu-rename-original-retbleed-methods.patch
queue-6.4/objtool-x86-fix-srso-mess.patch
queue-6.4/x86-cpu-clean-up-srso-return-thunk-mess.patch
queue-6.4/x86-srso-disable-the-mitigation-on-unaffected-configurations.patch
queue-6.4/x86-cpu-fix-__x86_return_thunk-symbol-type.patch



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