From nobody Sun Feb 8 06:22:26 2026 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 964CE19470 for ; Tue, 6 Feb 2024 17:39:56 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707241198; cv=none; b=K2X0W9v1EnYTh7ptN7YxHiYj7wWj0KA+ggn1ZPOj1+s6UlCZtNtd1TvU4P2naaK2WX8F16YZyocOWIMKa2zvHtUJu+SOl+yLaWrem+ewdTg69GMfOfk0gO3+M4a7vJEL+oOYzHIQDtIAXKQs2RLE35E1ee6l5bklMQQGd30E8aQ= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707241198; c=relaxed/simple; bh=ZMQTWbcCGrR/agcFVkVVEI05vXn0HszebfL8x+q/HRU=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=adADQ9qIN8MFHAT8U8wxRWfo4UVni/O/DV+71gpnUQk04GsrmKrPScA3r91s8ZBrKZecrJLFOF9Xb2sqGlEGAJL3X1yDvQCBzYehAXl9YSAEnqxNn94wjfRblRnUoj/8rez4BmaZXcoW3/piUrDEdaSDeHtB7HuauFAY1/emZl4= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=SQM2rshg; arc=none smtp.client-ip=170.10.133.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="SQM2rshg" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1707241195; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=zQJi5lVSKToVYNDb/xc3D9ULA1cJ8DD0UMSW58V8ctw=; b=SQM2rshgahd4zFYb7iSQWBd+XxXNgdCDmCkhxm0kep9pyL6d/VYwFVXNYRLgoqAGNYKS1p zLDfCKeOG2rPXUTHcZQ1VlvVANvWu3UW46qjcbxk819US/1DjYI65fb8EBhxM8b5/MGcg2 MedAjoyV2Hk0owHRm8m0Sd1idt0UoFY= Received: from mimecast-mx02.redhat.com (mx-ext.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-652-ZIz0_IVqNuCeGd0hcpWWmQ-1; Tue, 06 Feb 2024 12:39:52 -0500 X-MC-Unique: ZIz0_IVqNuCeGd0hcpWWmQ-1 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.rdu2.redhat.com [10.11.54.4]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 613AD1C29EA3; Tue, 6 Feb 2024 17:39:51 +0000 (UTC) Received: from vschneid-thinkpadt14sgen2i.remote.csb (unknown [10.39.193.2]) by smtp.corp.redhat.com (Postfix) with ESMTPS id CB6A02026D06; Tue, 6 Feb 2024 17:39:46 +0000 (UTC) From: Valentin Schneider To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org, linux-arch@vger.kernel.org, x86@kernel.org Cc: Peter Zijlstra , Josh Poimboeuf , Thomas Gleixner , Borislav Petkov , Pawan Gupta , Ingo Molnar , Dave Hansen , "H. Peter Anvin" , Paolo Bonzini , Wanpeng Li , Vitaly Kuznetsov , Arnd Bergmann , Jason Baron , Steven Rostedt , Ard Biesheuvel , Frederic Weisbecker , "Paul E. McKenney" , Feng Tang , Andrew Morton , "Mike Rapoport (IBM)" , Vlastimil Babka , David Hildenbrand , "ndesaulniers@google.com" , Michael Kelley , "Masami Hiramatsu (Google)" Subject: [PATCH v2 1/5] jump_label,module: Don't alloc static_key_mod for __ro_after_init keys Date: Tue, 6 Feb 2024 18:39:07 +0100 Message-ID: <20240206173911.4131670-2-vschneid@redhat.com> In-Reply-To: <20240206173911.4131670-1-vschneid@redhat.com> References: <20240206173911.4131670-1-vschneid@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.4 Content-Type: text/plain; charset="utf-8" From: Peter Zijlstra When a static_key is marked ro_after_init, its state will never change (after init), therefore jump_label_update() will never need to iterate the entries, and thus module load won't actually need to track this -- avoiding the static_key::next write. Therefore, mark these keys such that jump_label_add_module() might recognise them and avoid the modification. Use the special state: 'static_key_linked(key) && !static_key_mod(key)' to denote such keys. jump_label_add_module() does not exist under CONFIG_JUMP_LABEL=3Dn, so the newly-introduced jump_label_ro() can be defined as a nop for that configuration. Link: http://lore.kernel.org/r/20230705204142.GB2813335@hirez.programming.k= icks-ass.net Signed-off-by: Peter Zijlstra (Intel) [Added comments and build fix] Signed-off-by: Valentin Schneider Acked-by: Josh Poimboeuf --- include/asm-generic/sections.h | 5 ++++ include/linux/jump_label.h | 3 +++ init/main.c | 1 + kernel/jump_label.c | 49 ++++++++++++++++++++++++++++++++++ 4 files changed, 58 insertions(+) diff --git a/include/asm-generic/sections.h b/include/asm-generic/sections.h index db13bb620f527..c768de6f19a9a 100644 --- a/include/asm-generic/sections.h +++ b/include/asm-generic/sections.h @@ -180,6 +180,11 @@ static inline bool is_kernel_rodata(unsigned long addr) addr < (unsigned long)__end_rodata; } =20 +static inline bool is_kernel_ro_after_init(unsigned long addr) +{ + return addr >=3D (unsigned long)__start_ro_after_init && + addr < (unsigned long)__end_ro_after_init; +} /** * is_kernel_inittext - checks if the pointer address is located in the * .init.text section diff --git a/include/linux/jump_label.h b/include/linux/jump_label.h index f0a949b7c9733..3b103d88c139e 100644 --- a/include/linux/jump_label.h +++ b/include/linux/jump_label.h @@ -216,6 +216,7 @@ extern struct jump_entry __start___jump_table[]; extern struct jump_entry __stop___jump_table[]; =20 extern void jump_label_init(void); +extern void jump_label_ro(void); extern void jump_label_lock(void); extern void jump_label_unlock(void); extern void arch_jump_label_transform(struct jump_entry *entry, @@ -265,6 +266,8 @@ static __always_inline void jump_label_init(void) static_key_initialized =3D true; } =20 +static __always_inline void jump_label_ro(void) { } + static __always_inline bool static_key_false(struct static_key *key) { if (unlikely_notrace(static_key_count(key) > 0)) diff --git a/init/main.c b/init/main.c index e24b0780fdff7..5f51d8b910dc1 100644 --- a/init/main.c +++ b/init/main.c @@ -1407,6 +1407,7 @@ static void mark_readonly(void) * insecure pages which are W+X. */ rcu_barrier(); + jump_label_ro(); mark_rodata_ro(); rodata_test(); } else diff --git a/kernel/jump_label.c b/kernel/jump_label.c index d9c822bbffb8d..25a5ed1147841 100644 --- a/kernel/jump_label.c +++ b/kernel/jump_label.c @@ -530,6 +530,45 @@ void __init jump_label_init(void) cpus_read_unlock(); } =20 +static inline bool static_key_sealed(struct static_key *key) +{ + return (key->type & JUMP_TYPE_LINKED) && !(key->type & ~JUMP_TYPE_MASK); +} + +static inline void static_key_seal(struct static_key *key) +{ + unsigned long type =3D key->type & JUMP_TYPE_TRUE; + key->type =3D JUMP_TYPE_LINKED | type; +} + +void jump_label_ro(void) +{ + struct jump_entry *iter_start =3D __start___jump_table; + struct jump_entry *iter_stop =3D __stop___jump_table; + struct jump_entry *iter; + + if (WARN_ON_ONCE(!static_key_initialized)) + return; + + cpus_read_lock(); + jump_label_lock(); + + for (iter =3D iter_start; iter < iter_stop; iter++) { + struct static_key *iterk =3D jump_entry_key(iter); + + if (!is_kernel_ro_after_init((unsigned long)iterk)) + continue; + + if (static_key_sealed(iterk)) + continue; + + static_key_seal(iterk); + } + + jump_label_unlock(); + cpus_read_unlock(); +} + #ifdef CONFIG_MODULES =20 enum jump_label_type jump_label_init_type(struct jump_entry *entry) @@ -650,6 +689,15 @@ static int jump_label_add_module(struct module *mod) static_key_set_entries(key, iter); continue; } + + /* + * If the key was sealed at init, then there's no need to keep a + * reference to its module entries - just patch them now and be + * done with it. + */ + if (static_key_sealed(key)) + goto do_poke; + jlm =3D kzalloc(sizeof(struct static_key_mod), GFP_KERNEL); if (!jlm) return -ENOMEM; @@ -675,6 +723,7 @@ static int jump_label_add_module(struct module *mod) static_key_set_linked(key); =20 /* Only update if we've changed from our initial state */ +do_poke: if (jump_label_type(iter) !=3D jump_label_init_type(iter)) __jump_label_update(key, iter, iter_stop, true); } --=20 2.43.0 From nobody Sun Feb 8 06:22:26 2026 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4E2DC17997 for ; Tue, 6 Feb 2024 17:40:04 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; 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Tue, 06 Feb 2024 12:39:57 -0500 X-MC-Unique: X4XQR69UNdyvfJZ65mDaVw-1 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.rdu2.redhat.com [10.11.54.4]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 2041E101FA2C; Tue, 6 Feb 2024 17:39:56 +0000 (UTC) Received: from vschneid-thinkpadt14sgen2i.remote.csb (unknown [10.39.193.2]) by smtp.corp.redhat.com (Postfix) with ESMTPS id A881D2026D06; Tue, 6 Feb 2024 17:39:51 +0000 (UTC) From: Valentin Schneider To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org, linux-arch@vger.kernel.org, x86@kernel.org Cc: Josh Poimboeuf , Thomas Gleixner , Borislav Petkov , Peter Zijlstra , Pawan Gupta , Ingo Molnar , Dave Hansen , "H. Peter Anvin" , Paolo Bonzini , Wanpeng Li , Vitaly Kuznetsov , Arnd Bergmann , Jason Baron , Steven Rostedt , Ard Biesheuvel , Frederic Weisbecker , "Paul E. McKenney" , Feng Tang , Andrew Morton , "Mike Rapoport (IBM)" , Vlastimil Babka , David Hildenbrand , "ndesaulniers@google.com" , Michael Kelley , "Masami Hiramatsu (Google)" Subject: [PATCH v2 2/5] context_tracking: Make context_tracking_key __ro_after_init Date: Tue, 6 Feb 2024 18:39:08 +0100 Message-ID: <20240206173911.4131670-3-vschneid@redhat.com> In-Reply-To: <20240206173911.4131670-1-vschneid@redhat.com> References: <20240206173911.4131670-1-vschneid@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.4 Content-Type: text/plain; charset="utf-8" context_tracking_key is only ever enabled in __init ct_cpu_tracker_user(), so mark it as __ro_after_init. Signed-off-by: Valentin Schneider Acked-by: Josh Poimboeuf --- kernel/context_tracking.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/context_tracking.c b/kernel/context_tracking.c index 6ef0b35fc28c5..cc4f3a57f848c 100644 --- a/kernel/context_tracking.c +++ b/kernel/context_tracking.c @@ -432,7 +432,7 @@ static __always_inline void ct_kernel_enter(bool user, = int offset) { } #define CREATE_TRACE_POINTS #include =20 -DEFINE_STATIC_KEY_FALSE(context_tracking_key); +DEFINE_STATIC_KEY_FALSE_RO(context_tracking_key); EXPORT_SYMBOL_GPL(context_tracking_key); =20 static noinstr bool context_tracking_recursion_enter(void) --=20 2.43.0 From nobody Sun Feb 8 06:22:26 2026 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B827719470 for ; Tue, 6 Feb 2024 17:40:08 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.129.124 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707241210; cv=none; b=PVv2Mwlou2Sake20O3YiOZg8KEehnFewvIcDbYx7pPfdev+IGnQCrvxuTJlKMzLTodYMIBhx6vR+Axx1ofOp43vXFmuDFJqvG8n/IS61f1RCD84iWybIYKDnFN6g2V0lq7Nqb5SB2JacfhEssGBTNJTZYUO0RxiFScMOWDVY0Fw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707241210; c=relaxed/simple; bh=OqaVifQS+nxzCD21b4s8rJ7JH6j5ozOv9bSA598QaaY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=E4F16/X6nsCTgjLFe2US3IMvjQn+ff97o0P9u4nwyCgTJhxXgkI4X80w7LPEOT/y0okvl9w7s3XKKbyhpr7/+U7g7MnRYOBQHb6NE9Vs5sYJWjxqIkxKR0+isp2B36hMmEUylKjnBYbUOkY0KHJz0Z1kMZbEL93+MgBNNisVlQY= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=C1MOs9an; arc=none smtp.client-ip=170.10.129.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="C1MOs9an" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1707241207; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=DiAeFErACPu2Qq/VSwmzn5NIHI5rZO8DYF37cTAxg+8=; b=C1MOs9anrQSsXFRlV/Bfj8OEba6wS8eDNuYaWzmIl1sgnBKiP0vlspln4ajXN1NOo6n6EY 0IQIhLuNXcGk/NS9oBZB0dPTqR+KxsUpwUdN1oqJ1+5YNAgIwk1HbpyMIpAy8Im9xZp/PS y7rSrHgzDmgmOXTf+cY0oVL8yRoClfQ= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-527-Leok8IbMPaWMhJaxElOyGA-1; Tue, 06 Feb 2024 12:40:02 -0500 X-MC-Unique: Leok8IbMPaWMhJaxElOyGA-1 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.rdu2.redhat.com [10.11.54.4]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 98959879843; Tue, 6 Feb 2024 17:40:00 +0000 (UTC) Received: from vschneid-thinkpadt14sgen2i.remote.csb (unknown [10.39.193.2]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 5B9882026D06; Tue, 6 Feb 2024 17:39:56 +0000 (UTC) From: Valentin Schneider To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org, linux-arch@vger.kernel.org, x86@kernel.org Cc: Sean Christopherson , Josh Poimboeuf , Thomas Gleixner , Borislav Petkov , Peter Zijlstra , Pawan Gupta , Ingo Molnar , Dave Hansen , "H. Peter Anvin" , Paolo Bonzini , Wanpeng Li , Vitaly Kuznetsov , Arnd Bergmann , Jason Baron , Steven Rostedt , Ard Biesheuvel , Frederic Weisbecker , "Paul E. McKenney" , Feng Tang , Andrew Morton , "Mike Rapoport (IBM)" , Vlastimil Babka , David Hildenbrand , "ndesaulniers@google.com" , Michael Kelley , "Masami Hiramatsu (Google)" Subject: [PATCH v2 3/5] x86/kvm: Make kvm_async_pf_enabled __ro_after_init Date: Tue, 6 Feb 2024 18:39:09 +0100 Message-ID: <20240206173911.4131670-4-vschneid@redhat.com> In-Reply-To: <20240206173911.4131670-1-vschneid@redhat.com> References: <20240206173911.4131670-1-vschneid@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.4 Content-Type: text/plain; charset="utf-8" kvm_async_pf_enabled is only ever enabled in __init kvm_guest_init(), so mark it as __ro_after_init. Reviewed-by: Sean Christopherson Signed-off-by: Valentin Schneider Acked-by: Josh Poimboeuf --- arch/x86/kernel/kvm.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c index dfe9945b9bece..8f48ce7adfb28 100644 --- a/arch/x86/kernel/kvm.c +++ b/arch/x86/kernel/kvm.c @@ -44,7 +44,7 @@ #include #include =20 -DEFINE_STATIC_KEY_FALSE(kvm_async_pf_enabled); +DEFINE_STATIC_KEY_FALSE_RO(kvm_async_pf_enabled); =20 static int kvmapf =3D 1; =20 --=20 2.43.0 From nobody Sun Feb 8 06:22:26 2026 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id CF31914003 for ; Tue, 6 Feb 2024 17:40:11 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707241213; cv=none; b=qftxBwEKTQzPiTkvAQ3GB256b/00M9jRP04FOBh7zhOePjt5uJYiGkHGr75hy6ExIYV7Tlm9yNGP0WgReUUcLVUhFCw9s4Kppge7f10HJwWm3P5sQBrtbw55Lh+p2Q+Sd8NrYeK4n1HqhZ056Od7oVhbCY0FZlx4nDPCQAcIc/o= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707241213; c=relaxed/simple; bh=S1tCYMcNXkihabDiqpDnmfHcIQO8CZnjsn5bQsn7UME=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=eQSzH9F2YykDf9weK8PLn3vFQmtDFhYZkMWoTZi6SI+qDHRaLvBuIfz23/8bL1OSwTuCeD+T1K0zBRuCCjW6ByNl5jaF4mxtKeMgl1JWelbtZQZO+vNC2vWjdl4p/oIfI8vxIiQyxFSpdR+IE8RLQDC6V+AzVzuNIq7A+56S0JA= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=V99u+Uce; arc=none smtp.client-ip=170.10.133.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="V99u+Uce" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1707241210; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=e9TbiIW7v7P2/Ue8wq2AyQZ0xtrZV7cRznu5SFXHEEQ=; b=V99u+UceR2Jpq/vJH/CA10p2Ua53l1j3dJTD3AYNgn53PORQ4SfDQU/tBMhhGaACZpcYk8 8qQESLy8CdKhpZZGvcG3jLexeyteBVyfjvCL/0NkBWidXcOwEbfkCuTqXcoaAsE7/fTVDG 1KCEGZtjKf6Uu+8Q/R6LUcaIbEGZrj8= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-488-3Nw8cN53NgCVyR-ABxYhyA-1; Tue, 06 Feb 2024 12:40:06 -0500 X-MC-Unique: 3Nw8cN53NgCVyR-ABxYhyA-1 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.rdu2.redhat.com [10.11.54.4]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id CC028101FA2E; Tue, 6 Feb 2024 17:40:04 +0000 (UTC) Received: from vschneid-thinkpadt14sgen2i.remote.csb (unknown [10.39.193.2]) by smtp.corp.redhat.com (Postfix) with ESMTPS id D20342026D06; Tue, 6 Feb 2024 17:40:00 +0000 (UTC) From: Valentin Schneider To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org, linux-arch@vger.kernel.org, x86@kernel.org Cc: Josh Poimboeuf , Thomas Gleixner , Borislav Petkov , Peter Zijlstra , Pawan Gupta , Ingo Molnar , Dave Hansen , "H. Peter Anvin" , Paolo Bonzini , Wanpeng Li , Vitaly Kuznetsov , Arnd Bergmann , Jason Baron , Steven Rostedt , Ard Biesheuvel , Frederic Weisbecker , "Paul E. McKenney" , Feng Tang , Andrew Morton , "Mike Rapoport (IBM)" , Vlastimil Babka , David Hildenbrand , "ndesaulniers@google.com" , Michael Kelley , "Masami Hiramatsu (Google)" Subject: [PATCH v2 4/5] x86/speculation: Make mds_user_clear __ro_after_init Date: Tue, 6 Feb 2024 18:39:10 +0100 Message-ID: <20240206173911.4131670-5-vschneid@redhat.com> In-Reply-To: <20240206173911.4131670-1-vschneid@redhat.com> References: <20240206173911.4131670-1-vschneid@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.4 Content-Type: text/plain; charset="utf-8" mds_user_clear is only ever enabled in: o __init mds_select_mitigation() o __init taa_select_mitigation() o __init mmio_select_mitigation() mark it as __ro_after_init. Signed-off-by: Valentin Schneider Acked-by: Josh Poimboeuf --- arch/x86/kernel/cpu/bugs.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c index bb0ab8466b919..bab36096015d8 100644 --- a/arch/x86/kernel/cpu/bugs.c +++ b/arch/x86/kernel/cpu/bugs.c @@ -112,7 +112,7 @@ DEFINE_STATIC_KEY_FALSE(switch_mm_cond_ibpb); DEFINE_STATIC_KEY_FALSE(switch_mm_always_ibpb); =20 /* Control MDS CPU buffer clear before returning to user space */ -DEFINE_STATIC_KEY_FALSE(mds_user_clear); +DEFINE_STATIC_KEY_FALSE_RO(mds_user_clear); EXPORT_SYMBOL_GPL(mds_user_clear); /* Control MDS CPU buffer clear before idling (halt, mwait) */ DEFINE_STATIC_KEY_FALSE(mds_idle_clear); --=20 2.43.0 From nobody Sun Feb 8 06:22:26 2026 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7F11A1BDE6 for ; Tue, 6 Feb 2024 17:40:15 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.129.124 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707241217; cv=none; b=F/xgr62nrKPodjlw7WsWbWmXekLkkkkN0ohGxwU5IPAb6CxQJe5GPPYqf3do7B1HSMUpyfxNI743VWt869KEP7RTSbacHFEXXatMHbOdwQ0JBlVxCsFsJDSh7uzH1Nt3cvkEZNTxV24O3CCxKpPK/h/gOxLZe/AaAg9mNIFU8Ek= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707241217; c=relaxed/simple; bh=Pj/Lvr3RhnSeb3N65sWQi1MGfOlxf0VpQWQY8/5A14E=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Thu0xPpHSCGqqH+GdGMR4/DdNGV50b+4FvUmNfD9eE+UH3PSfUwap5DL1IKNJw12mZddFLAamAt1IRvrdeW4gLgnghHjix9o5D5q4ImWbagQ0yt46bpLUBs1jks7nUH/28M2k21LeJ6vS4a7KxKvFAzARw7Pm9ggzo+Pnew4/UY= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=hbBEgWvg; arc=none smtp.client-ip=170.10.129.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="hbBEgWvg" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1707241214; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=0DIKSVQAHIC80NxjvBA7Hf0Rcwayb35T2JV1uGe0svE=; b=hbBEgWvgl0H+uf92GdKA2xkba7MWfqNY5KTmg1/IzCeDQuBvfU7wtIUNjPprRDbKbsRKKJ 4qXeaqfA5aB0cBdXXcn9rnCk09rJ4Ydy4IGiMZTLsRQ1ZgOCddq5Vz1mDrNjyB3HS3OZHk xXhBCyUl6fjJUDzS3TPy3fUI65yrfrA= Received: from mimecast-mx02.redhat.com (mx-ext.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-21-YsH3nB9OOKS4VDnNf5PLTQ-1; Tue, 06 Feb 2024 12:40:10 -0500 X-MC-Unique: YsH3nB9OOKS4VDnNf5PLTQ-1 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.rdu2.redhat.com [10.11.54.4]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 51ACC1C29EA3; Tue, 6 Feb 2024 17:40:09 +0000 (UTC) Received: from vschneid-thinkpadt14sgen2i.remote.csb (unknown [10.39.193.2]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 241C62026D06; Tue, 6 Feb 2024 17:40:05 +0000 (UTC) From: Valentin Schneider To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org, linux-arch@vger.kernel.org, x86@kernel.org Cc: Josh Poimboeuf , Thomas Gleixner , Borislav Petkov , Peter Zijlstra , Pawan Gupta , Ingo Molnar , Dave Hansen , "H. Peter Anvin" , Paolo Bonzini , Wanpeng Li , Vitaly Kuznetsov , Arnd Bergmann , Jason Baron , Steven Rostedt , Ard Biesheuvel , Frederic Weisbecker , "Paul E. McKenney" , Feng Tang , Andrew Morton , "Mike Rapoport (IBM)" , Vlastimil Babka , David Hildenbrand , "ndesaulniers@google.com" , Michael Kelley , "Masami Hiramatsu (Google)" Subject: [PATCH v2 5/5] x86/tsc: Make __use_tsc __ro_after_init Date: Tue, 6 Feb 2024 18:39:11 +0100 Message-ID: <20240206173911.4131670-6-vschneid@redhat.com> In-Reply-To: <20240206173911.4131670-1-vschneid@redhat.com> References: <20240206173911.4131670-1-vschneid@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.4 Content-Type: text/plain; charset="utf-8" __use_tsc is only ever enabled in __init tsc_enable_sched_clock(), so mark it as __ro_after_init. Signed-off-by: Valentin Schneider Acked-by: Josh Poimboeuf --- arch/x86/kernel/tsc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/kernel/tsc.c b/arch/x86/kernel/tsc.c index 15f97c0abc9d0..f19b42ea40573 100644 --- a/arch/x86/kernel/tsc.c +++ b/arch/x86/kernel/tsc.c @@ -44,7 +44,7 @@ EXPORT_SYMBOL(tsc_khz); static int __read_mostly tsc_unstable; static unsigned int __initdata tsc_early_khz; =20 -static DEFINE_STATIC_KEY_FALSE(__use_tsc); +static DEFINE_STATIC_KEY_FALSE_RO(__use_tsc); =20 int tsc_clocksource_reliable; =20 --=20 2.43.0