From: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
To: x86@kernel.org, David Kaplan <david.kaplan@amd.com>,
Nikolay Borisov <nik.borisov@suse.com>,
"H. Peter Anvin" <hpa@zytor.com>,
Josh Poimboeuf <jpoimboe@kernel.org>,
Sean Christopherson <seanjc@google.com>,
Paolo Bonzini <pbonzini@redhat.com>,
Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>
Cc: linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
Asit Mallick <asit.k.mallick@intel.com>,
Tao Zhang <tao1.zhang@intel.com>
Subject: [PATCH v6 3/9] x86/vmscape: Rename x86_ibpb_exit_to_user to x86_predictor_flush_exit_to_user
Date: Mon, 1 Dec 2025 22:19:29 -0800 [thread overview]
Message-ID: <20251201-vmscape-bhb-v6-3-d610dd515714@linux.intel.com> (raw)
In-Reply-To: <20251201-vmscape-bhb-v6-0-d610dd515714@linux.intel.com>
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@linux.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
next prev parent reply other threads:[~2025-12-02 6:19 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-12-02 6:18 [PATCH v6 0/9] VMSCAPE optimization for BHI variant Pawan Gupta
2025-12-02 6:18 ` [PATCH v6 1/9] x86/bhi: x86/vmscape: Move LFENCE out of clear_bhb_loop() Pawan Gupta
2026-01-01 12:51 ` Borislav Petkov
2026-01-06 4:29 ` Pawan Gupta
2025-12-02 6:19 ` [PATCH v6 2/9] x86/bhi: Make clear_bhb_loop() effective on newer CPUs Pawan Gupta
2025-12-10 12:31 ` Nikolay Borisov
2025-12-10 13:35 ` David Laight
2025-12-10 15:42 ` Nikolay Borisov
2025-12-14 18:38 ` Pawan Gupta
2025-12-14 19:02 ` David Laight
2025-12-15 18:01 ` Pawan Gupta
2025-12-15 21:05 ` David Laight
2025-12-14 17:16 ` Pawan Gupta
2026-01-24 19:34 ` Borislav Petkov
2026-03-05 0:41 ` Pawan Gupta
2025-12-02 6:19 ` Pawan Gupta [this message]
2025-12-02 6:19 ` [PATCH v6 4/9] x86/vmscape: Move mitigation selection to a switch() Pawan Gupta
2025-12-10 16:15 ` Nikolay Borisov
2025-12-02 6:19 ` [PATCH v6 5/9] x86/vmscape: Use write_ibpb() instead of indirect_branch_prediction_barrier() Pawan Gupta
2025-12-02 6:20 ` [PATCH v6 6/9] x86/vmscape: Use static_call() for predictor flush Pawan Gupta
2025-12-11 10:06 ` Nikolay Borisov
2025-12-11 10:50 ` Peter Zijlstra
2025-12-14 18:45 ` Pawan Gupta
2025-12-02 6:20 ` [PATCH v6 7/9] x86/vmscape: Deploy BHB clearing mitigation Pawan Gupta
2025-12-11 14:26 ` Nikolay Borisov
2025-12-02 6:20 ` [PATCH v6 8/9] x86/vmscape: Fix conflicting attack-vector controls with =force Pawan Gupta
2025-12-02 6:21 ` [PATCH v6 9/9] x86/vmscape: Add cmdline vmscape=on to override attack vector controls Pawan Gupta
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