From: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
To: x86@kernel.org, Nikolay Borisov <nik.borisov@suse.com>,
"H. Peter Anvin" <hpa@zytor.com>,
Josh Poimboeuf <jpoimboe@kernel.org>,
David Kaplan <david.kaplan@amd.com>,
Sean Christopherson <seanjc@google.com>,
Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
Peter Zijlstra <peterz@infradead.org>,
Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Andrii Nakryiko <andrii@kernel.org>,
KP Singh <kpsingh@kernel.org>, Jiri Olsa <jolsa@kernel.org>,
"David S. Miller" <davem@davemloft.net>,
David Laight <david.laight.linux@gmail.com>,
Andy Lutomirski <luto@kernel.org>,
Thomas Gleixner <tglx@kernel.org>, Ingo Molnar <mingo@redhat.com>,
David Ahern <dsahern@kernel.org>,
Martin KaFai Lau <martin.lau@linux.dev>,
Eduard Zingerman <eddyz87@gmail.com>, Song Liu <song@kernel.org>,
Yonghong Song <yonghong.song@linux.dev>,
John Fastabend <john.fastabend@gmail.com>,
Stanislav Fomichev <sdf@fomichev.me>, Hao Luo <haoluo@google.com>,
Paolo Bonzini <pbonzini@redhat.com>,
Jonathan Corbet <corbet@lwn.net>
Cc: linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
Asit Mallick <asit.k.mallick@intel.com>,
Tao Zhang <tao1.zhang@intel.com>,
bpf@vger.kernel.org, netdev@vger.kernel.org,
linux-doc@vger.kernel.org
Subject: [PATCH v7 04/10] x86/vmscape: Rename x86_ibpb_exit_to_user to x86_predictor_flush_exit_to_user
Date: Thu, 19 Mar 2026 08:41:05 -0700 [thread overview]
Message-ID: <20260319-vmscape-bhb-v7-4-b76a777a98af@linux.intel.com> (raw)
In-Reply-To: <20260319-vmscape-bhb-v7-0-b76a777a98af@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.
Suggested-by: Sean Christopherson <seanjc@google.com>
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 ce3eb6d5fdf9..c45858db16c9 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 0f5e6ed6c9c2..0a55b1c64741 100644
--- a/arch/x86/include/asm/nospec-branch.h
+++ b/arch/x86/include/asm/nospec-branch.h
@@ -533,7 +533,7 @@ 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 83f51cab0b1e..47c020b80371 100644
--- a/arch/x86/kernel/cpu/bugs.c
+++ b/arch/x86/kernel/cpu/bugs.c
@@ -65,8 +65,8 @@ 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 fd1c4a36b593..45d7cfedc507 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -11464,7 +11464,7 @@ 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:[~2026-03-19 15:41 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-19 15:40 [PATCH v7 00/10] VMSCAPE optimization for BHI variant Pawan Gupta
2026-03-19 15:40 ` [PATCH v7 01/10] x86/bhi: x86/vmscape: Move LFENCE out of clear_bhb_loop() Pawan Gupta
2026-03-19 15:40 ` [PATCH v7 02/10] x86/bhi: Make clear_bhb_loop() effective on newer CPUs Pawan Gupta
2026-03-19 15:40 ` [PATCH v7 03/10] x86/bhi: Rename clear_bhb_loop() to clear_bhb_loop_nofence() Pawan Gupta
2026-03-23 14:44 ` Nikolay Borisov
2026-03-23 17:07 ` Pawan Gupta
2026-03-19 15:41 ` Pawan Gupta [this message]
2026-03-19 15:41 ` [PATCH v7 05/10] x86/vmscape: Move mitigation selection to a switch() Pawan Gupta
2026-03-19 15:41 ` [PATCH v7 06/10] x86/vmscape: Use write_ibpb() instead of indirect_branch_prediction_barrier() Pawan Gupta
2026-03-19 15:41 ` [PATCH v7 07/10] x86/vmscape: Use static_call() for predictor flush Pawan Gupta
2026-03-19 16:56 ` bot+bpf-ci
2026-03-19 18:05 ` Pawan Gupta
2026-03-19 20:58 ` Peter Zijlstra
2026-03-19 21:34 ` Pawan Gupta
2026-03-19 21:44 ` Peter Zijlstra
2026-03-19 22:06 ` Pawan Gupta
2026-03-20 6:22 ` Pawan Gupta
2026-03-20 9:03 ` Peter Zijlstra
2026-03-20 11:31 ` Borislav Petkov
2026-03-20 18:23 ` Pawan Gupta
2026-03-24 20:00 ` Borislav Petkov
2026-03-24 20:14 ` Pawan Gupta
2026-03-19 15:42 ` [PATCH v7 08/10] x86/vmscape: Deploy BHB clearing mitigation Pawan Gupta
2026-03-19 15:42 ` [PATCH v7 09/10] x86/vmscape: Fix conflicting attack-vector controls with =force Pawan Gupta
2026-03-19 15:42 ` [PATCH v7 10/10] x86/vmscape: Add cmdline vmscape=on to override attack vector controls Pawan Gupta
2026-03-19 16:40 ` bot+bpf-ci
2026-03-19 17:57 ` Pawan Gupta
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