linux-kernel - [PATCH v4 05/11] x86/vmscape: Rename x86_ibpb_exit_to_user to x86_predictor_flush_exit_to

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Message-ID: <20251119-vmscape-bhb-v4-5-1adad4e69ddc@linux.intel.com>
Date: Wed, 19 Nov 2025 22:18:49 -0800
From: Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>
To: x86@...nel.org, David Kaplan <david.kaplan@....com>,
	Nikolay Borisov <nik.borisov@...e.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Josh Poimboeuf <jpoimboe@...nel.org>,
	Sean Christopherson <seanjc@...gle.com>,
	Paolo Bonzini <pbonzini@...hat.com>, Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>
Cc: linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
	Asit Mallick <asit.k.mallick@...el.com>,
	Tao Zhang <tao1.zhang@...el.com>
Subject: [PATCH v4 05/11] x86/vmscape: Rename x86_ibpb_exit_to_user to
 x86_predictor_flush_exit_to_user

With the upcoming changes x86_ibpb_exit_to_user will also be used when BHB
clearing sequence is used. Rename it cover both the cases.

No functional change.

Signed-off-by: Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>
---
 arch/x86/include/asm/entry-common.h  | 6 +++---
 arch/x86/include/asm/nospec-branch.h | 2 +-
 arch/x86/kernel/cpu/bugs.c           | 4 ++--
 arch/x86/kvm/x86.c                   | 2 +-
 4 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/arch/x86/include/asm/entry-common.h b/arch/x86/include/asm/entry-common.h
index ce3eb6d5fdf9f2dba59b7bad24afbfafc8c36918..c45858db16c92fc1364fb818185fba7657840991 100644
--- a/arch/x86/include/asm/entry-common.h
+++ b/arch/x86/include/asm/entry-common.h
@@ -94,11 +94,11 @@ static inline void arch_exit_to_user_mode_prepare(struct pt_regs *regs,
 	 */
 	choose_random_kstack_offset(rdtsc());
 
-	/* Avoid unnecessary reads of 'x86_ibpb_exit_to_user' */
+	/* Avoid unnecessary reads of 'x86_predictor_flush_exit_to_user' */
 	if (cpu_feature_enabled(X86_FEATURE_IBPB_EXIT_TO_USER) &&
-	    this_cpu_read(x86_ibpb_exit_to_user)) {
+	    this_cpu_read(x86_predictor_flush_exit_to_user)) {
 		indirect_branch_prediction_barrier();
-		this_cpu_write(x86_ibpb_exit_to_user, false);
+		this_cpu_write(x86_predictor_flush_exit_to_user, false);
 	}
 }
 #define arch_exit_to_user_mode_prepare arch_exit_to_user_mode_prepare
diff --git a/arch/x86/include/asm/nospec-branch.h b/arch/x86/include/asm/nospec-branch.h
index ec5ebf96dbb9e240f402f39efc6929ae45ec8f0b..df60f9cf51b84e5b75e5db70713188d2e6ad0f5d 100644
--- a/arch/x86/include/asm/nospec-branch.h
+++ b/arch/x86/include/asm/nospec-branch.h
@@ -531,7 +531,7 @@ void alternative_msr_write(unsigned int msr, u64 val, unsigned int feature)
 		: "memory");
 }
 
-DECLARE_PER_CPU(bool, x86_ibpb_exit_to_user);
+DECLARE_PER_CPU(bool, x86_predictor_flush_exit_to_user);
 
 static inline void indirect_branch_prediction_barrier(void)
 {
diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c
index d7fa03bf51b4517c12cc68e7c441f7589a4983d1..1e9b11198db0fe2483bd17b1327bcfd44a2c1dbf 100644
--- a/arch/x86/kernel/cpu/bugs.c
+++ b/arch/x86/kernel/cpu/bugs.c
@@ -113,8 +113,8 @@ EXPORT_PER_CPU_SYMBOL_GPL(x86_spec_ctrl_current);
  * be needed to before running userspace. That IBPB will flush the branch
  * predictor content.
  */
-DEFINE_PER_CPU(bool, x86_ibpb_exit_to_user);
-EXPORT_PER_CPU_SYMBOL_GPL(x86_ibpb_exit_to_user);
+DEFINE_PER_CPU(bool, x86_predictor_flush_exit_to_user);
+EXPORT_PER_CPU_SYMBOL_GPL(x86_predictor_flush_exit_to_user);
 
 u64 x86_pred_cmd __ro_after_init = PRED_CMD_IBPB;
 
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index c9c2aa6f4705e1ae257bf94572967a5724a940a7..60123568fba85c8a445f9220d3f4a1d11fd0eb77 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -11397,7 +11397,7 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
 	 * may migrate to.
 	 */
 	if (cpu_feature_enabled(X86_FEATURE_IBPB_EXIT_TO_USER))
-		this_cpu_write(x86_ibpb_exit_to_user, true);
+		this_cpu_write(x86_predictor_flush_exit_to_user, true);
 
 	/*
 	 * Consume any pending interrupts, including the possible source of

-- 
2.34.1