Patch "x86/bugs: Fix BHI handling of RRSBA" has been added to the 5.15-stable tree

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

    x86/bugs: Fix BHI handling of RRSBA

to the 5.15-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-fix-bhi-handling-of-rrsba.patch
and it can be found in the queue-5.15 subdirectory.

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


>From 1cea8a280dfd1016148a3820676f2f03e3f5b898 Mon Sep 17 00:00:00 2001
From: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>
Date: Wed, 10 Apr 2024 22:40:47 -0700
Subject: x86/bugs: Fix BHI handling of RRSBA

From: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>

commit 1cea8a280dfd1016148a3820676f2f03e3f5b898 upstream.

The ARCH_CAP_RRSBA check isn't correct: RRSBA may have already been
disabled by the Spectre v2 mitigation (or can otherwise be disabled by
the BHI mitigation itself if needed).  In that case retpolines are fine.

Fixes: ec9404e40e8f ("x86/bhi: Add BHI mitigation knob")
Signed-off-by: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Sean Christopherson <seanjc@xxxxxxxxxx>
Link: https://lore.kernel.org/r/6f56f13da34a0834b69163467449be7f58f253dc.1712813475.git.jpoimboe@xxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 arch/x86/kernel/cpu/bugs.c |   30 ++++++++++++++++++------------
 1 file changed, 18 insertions(+), 12 deletions(-)

--- a/arch/x86/kernel/cpu/bugs.c
+++ b/arch/x86/kernel/cpu/bugs.c
@@ -1515,20 +1515,25 @@ static enum spectre_v2_mitigation __init
 	return SPECTRE_V2_RETPOLINE;
 }
 
+static bool __ro_after_init rrsba_disabled;
+
 /* Disable in-kernel use of non-RSB RET predictors */
 static void __init spec_ctrl_disable_kernel_rrsba(void)
 {
-	u64 x86_arch_cap_msr;
+	if (rrsba_disabled)
+		return;
 
-	if (!boot_cpu_has(X86_FEATURE_RRSBA_CTRL))
+	if (!(x86_arch_cap_msr & ARCH_CAP_RRSBA)) {
+		rrsba_disabled = true;
 		return;
+	}
 
-	x86_arch_cap_msr = x86_read_arch_cap_msr();
+	if (!boot_cpu_has(X86_FEATURE_RRSBA_CTRL))
+		return;
 
-	if (x86_arch_cap_msr & ARCH_CAP_RRSBA) {
-		x86_spec_ctrl_base |= SPEC_CTRL_RRSBA_DIS_S;
-		update_spec_ctrl(x86_spec_ctrl_base);
-	}
+	x86_spec_ctrl_base |= SPEC_CTRL_RRSBA_DIS_S;
+	update_spec_ctrl(x86_spec_ctrl_base);
+	rrsba_disabled = true;
 }
 
 static void __init spectre_v2_determine_rsb_fill_type_at_vmexit(enum spectre_v2_mitigation mode)
@@ -1629,9 +1634,11 @@ static void __init bhi_select_mitigation
 		return;
 
 	/* Retpoline mitigates against BHI unless the CPU has RRSBA behavior */
-	if (cpu_feature_enabled(X86_FEATURE_RETPOLINE) &&
-	    !(x86_read_arch_cap_msr() & ARCH_CAP_RRSBA))
-		return;
+	if (cpu_feature_enabled(X86_FEATURE_RETPOLINE)) {
+		spec_ctrl_disable_kernel_rrsba();
+		if (rrsba_disabled)
+			return;
+	}
 
 	if (spec_ctrl_bhi_dis())
 		return;
@@ -2788,8 +2795,7 @@ static const char *spectre_bhi_state(voi
 		return "; BHI: BHI_DIS_S";
 	else if  (boot_cpu_has(X86_FEATURE_CLEAR_BHB_LOOP))
 		return "; BHI: SW loop, KVM: SW loop";
-	else if (boot_cpu_has(X86_FEATURE_RETPOLINE) &&
-		 !(x86_arch_cap_msr & ARCH_CAP_RRSBA))
+	else if (boot_cpu_has(X86_FEATURE_RETPOLINE) && rrsba_disabled)
 		return "; BHI: Retpoline";
 	else if  (boot_cpu_has(X86_FEATURE_CLEAR_BHB_LOOP_ON_VMEXIT))
 		return "; BHI: Syscall hardening, KVM: SW loop";


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

queue-5.15/x86-bugs-fix-bhi-documentation.patch
queue-5.15/x86-bugs-cache-the-value-of-msr_ia32_arch_capabilities.patch
queue-5.15/x86-bugs-remove-config_bhi_mitigation_auto-and-spectre_bhi-auto.patch
queue-5.15/x86-bugs-replace-config_spectre_bhi_-on-off-with-config_mitigation_spectre_bhi.patch
queue-5.15/x86-bugs-rename-various-ia32_cap-variables-to-x86_arch_cap_msr.patch
queue-5.15/x86-bugs-clarify-that-syscall-hardening-isn-t-a-bhi-mitigation.patch
queue-5.15/x86-bugs-fix-bhi-handling-of-rrsba.patch




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