From nobody Sun Dec 28 00:47:25 2025 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8206AC4167B for ; Thu, 14 Dec 2023 11:37:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1444059AbjLNLhE (ORCPT ); Thu, 14 Dec 2023 06:37:04 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52772 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1444016AbjLNLgq (ORCPT ); Thu, 14 Dec 2023 06:36:46 -0500 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id F02A519E; Thu, 14 Dec 2023 03:36:51 -0800 (PST) Date: Thu, 14 Dec 2023 11:36:49 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1702553810; h=from:from:sender:sender:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=zs8gKTAbaLj6Ugbppwcmr7EJztUM6IrhnlHBemGHW7Y=; b=pWYmJd5lfkY/cET3wcTYGdmzWjLpcKfLasuGpN8iBLyrM4cgygeNmvESQSYsCMyB/QJT++ seS0M+ArcQpO+J2pHwSapXr3m6Y8yAwAAKq20H3McjA5nc/f50pSaxBjwIz3dOVrpoGR5d dmTuJMGnL6HpJ2KkJfYBPJQSo+vSY3Z0/XtSBbXP7RfCAe/jREhjL9nzdXPWxH3YJGxiXi g/2lVQOclyYdsG5omYp+hu3cLqt7MAB0ixJ4IOXeRbjGe4DKG2y7mrCBDTchAYYJPzsTPM t4dF1RaJ1tZ5Mj805UywgWWSItBprE+INzwv/3zvWX5+XHMP7Xf1H0LQ4w1pNA== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1702553810; h=from:from:sender:sender:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=zs8gKTAbaLj6Ugbppwcmr7EJztUM6IrhnlHBemGHW7Y=; b=7KaPOmzQPvs9z5Ebb8RiMTLXa2SgFijKXTWWNkTdMyIBXIodhhmDiECPQ9itVtsGZ6dLXt QWHEMfC6oKqXfJBg== From: "tip-bot2 for Juergen Gross" Sender: tip-bot2@linutronix.de Reply-to: linux-kernel@vger.kernel.org To: linux-tip-commits@vger.kernel.org Subject: [tip: x86/paravirt] x86/paravirt: Move some functions and defines to alternative.c Cc: Juergen Gross , "Borislav Petkov (AMD)" , x86@kernel.org, linux-kernel@vger.kernel.org In-Reply-To: <20231129133332.31043-3-jgross@suse.com> References: <20231129133332.31043-3-jgross@suse.com> MIME-Version: 1.0 Message-ID: <170255380982.398.7785469441002504669.tip-bot2@tip-bot2> Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The following commit has been merged into the x86/paravirt branch of tip: Commit-ID: 9824b00c2b58f9e1072ef3ece571a2cfc71089d4 Gitweb: https://git.kernel.org/tip/9824b00c2b58f9e1072ef3ece571a2cfc= 71089d4 Author: Juergen Gross AuthorDate: Wed, 29 Nov 2023 14:33:29 +01:00 Committer: Borislav Petkov (AMD) CommitterDate: Sun, 10 Dec 2023 20:30:31 +01:00 x86/paravirt: Move some functions and defines to alternative.c As a preparation for replacing paravirt patching completely by alternative patching, move some backend functions and #defines to the alternatives code and header. Signed-off-by: Juergen Gross Signed-off-by: Borislav Petkov (AMD) Link: https://lore.kernel.org/r/20231129133332.31043-3-jgross@suse.com --- arch/x86/include/asm/alternative.h | 16 ++++++++++++- arch/x86/include/asm/paravirt.h | 12 +--------- arch/x86/include/asm/paravirt_types.h | 4 +--- arch/x86/include/asm/qspinlock_paravirt.h | 4 +-- arch/x86/kernel/alternative.c | 10 +++++++- arch/x86/kernel/kvm.c | 4 +-- arch/x86/kernel/paravirt.c | 30 ++++++---------------- arch/x86/xen/irq.c | 2 +- 8 files changed, 41 insertions(+), 41 deletions(-) diff --git a/arch/x86/include/asm/alternative.h b/arch/x86/include/asm/alte= rnative.h index 65f7909..ce788ab 100644 --- a/arch/x86/include/asm/alternative.h +++ b/arch/x86/include/asm/alternative.h @@ -330,6 +330,22 @@ static inline int alternatives_text_reserved(void *sta= rt, void *end) */ #define ASM_NO_INPUT_CLOBBER(clbr...) "i" (0) : clbr =20 +/* Macro for creating assembler functions avoiding any C magic. */ +#define DEFINE_ASM_FUNC(func, instr, sec) \ + asm (".pushsection " #sec ", \"ax\"\n" \ + ".global " #func "\n\t" \ + ".type " #func ", @function\n\t" \ + ASM_FUNC_ALIGN "\n" \ + #func ":\n\t" \ + ASM_ENDBR \ + instr "\n\t" \ + ASM_RET \ + ".size " #func ", . - " #func "\n\t" \ + ".popsection") + +void BUG_func(void); +void nop_func(void); + #else /* __ASSEMBLY__ */ =20 #ifdef CONFIG_SMP diff --git a/arch/x86/include/asm/paravirt.h b/arch/x86/include/asm/paravir= t.h index aa76ac7..f18bfa7 100644 --- a/arch/x86/include/asm/paravirt.h +++ b/arch/x86/include/asm/paravirt.h @@ -720,18 +720,6 @@ static __always_inline unsigned long arch_local_irq_sa= ve(void) #undef PVOP_VCALL4 #undef PVOP_CALL4 =20 -#define DEFINE_PARAVIRT_ASM(func, instr, sec) \ - asm (".pushsection " #sec ", \"ax\"\n" \ - ".global " #func "\n\t" \ - ".type " #func ", @function\n\t" \ - ASM_FUNC_ALIGN "\n" \ - #func ":\n\t" \ - ASM_ENDBR \ - instr "\n\t" \ - ASM_RET \ - ".size " #func ", . - " #func "\n\t" \ - ".popsection") - extern void default_banner(void); void native_pv_lock_init(void) __init; =20 diff --git a/arch/x86/include/asm/paravirt_types.h b/arch/x86/include/asm/p= aravirt_types.h index 483e19e..166e961 100644 --- a/arch/x86/include/asm/paravirt_types.h +++ b/arch/x86/include/asm/paravirt_types.h @@ -540,8 +540,6 @@ int paravirt_disable_iospace(void); __PVOP_VCALL(op, PVOP_CALL_ARG1(arg1), PVOP_CALL_ARG2(arg2), \ PVOP_CALL_ARG3(arg3), PVOP_CALL_ARG4(arg4)) =20 -void _paravirt_nop(void); -void paravirt_BUG(void); unsigned long paravirt_ret0(void); #ifdef CONFIG_PARAVIRT_XXL u64 _paravirt_ident_64(u64); @@ -551,7 +549,7 @@ void pv_native_irq_enable(void); unsigned long pv_native_read_cr2(void); #endif =20 -#define paravirt_nop ((void *)_paravirt_nop) +#define paravirt_nop ((void *)nop_func) =20 extern struct paravirt_patch_site __parainstructions[], __parainstructions_end[]; diff --git a/arch/x86/include/asm/qspinlock_paravirt.h b/arch/x86/include/a= sm/qspinlock_paravirt.h index 85b6e36..ef9697f 100644 --- a/arch/x86/include/asm/qspinlock_paravirt.h +++ b/arch/x86/include/asm/qspinlock_paravirt.h @@ -56,8 +56,8 @@ __PV_CALLEE_SAVE_REGS_THUNK(__pv_queued_spin_unlock_slowp= ath, ".spinlock.text"); "pop %rdx\n\t" \ FRAME_END =20 -DEFINE_PARAVIRT_ASM(__raw_callee_save___pv_queued_spin_unlock, - PV_UNLOCK_ASM, .spinlock.text); +DEFINE_ASM_FUNC(__raw_callee_save___pv_queued_spin_unlock, + PV_UNLOCK_ASM, .spinlock.text); =20 #else /* CONFIG_64BIT */ =20 diff --git a/arch/x86/kernel/alternative.c b/arch/x86/kernel/alternative.c index be35c8c..ca25dd2 100644 --- a/arch/x86/kernel/alternative.c +++ b/arch/x86/kernel/alternative.c @@ -385,6 +385,16 @@ apply_relocation(u8 *buf, size_t len, u8 *dest, u8 *sr= c, size_t src_len) } } =20 +/* Low-level backend functions usable from alternative code replacements. = */ +DEFINE_ASM_FUNC(nop_func, "", .entry.text); +EXPORT_SYMBOL_GPL(nop_func); + +noinstr void BUG_func(void) +{ + BUG(); +} +EXPORT_SYMBOL_GPL(BUG_func); + /* * Replace instructions with better alternatives for this CPU type. This r= uns * before SMP is initialized to avoid SMP problems with self modifying cod= e. diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c index 0ddb3bd..c461c1a 100644 --- a/arch/x86/kernel/kvm.c +++ b/arch/x86/kernel/kvm.c @@ -803,8 +803,8 @@ extern bool __raw_callee_save___kvm_vcpu_is_preempted(l= ong); "cmpb $0, " __stringify(KVM_STEAL_TIME_preempted) "+steal_time(%rax)\n\= t" \ "setne %al\n\t" =20 -DEFINE_PARAVIRT_ASM(__raw_callee_save___kvm_vcpu_is_preempted, - PV_VCPU_PREEMPTED_ASM, .text); +DEFINE_ASM_FUNC(__raw_callee_save___kvm_vcpu_is_preempted, + PV_VCPU_PREEMPTED_ASM, .text); #endif =20 static void __init kvm_guest_init(void) diff --git a/arch/x86/kernel/paravirt.c b/arch/x86/kernel/paravirt.c index 97f1436..acc5b10 100644 --- a/arch/x86/kernel/paravirt.c +++ b/arch/x86/kernel/paravirt.c @@ -34,14 +34,8 @@ #include #include =20 -/* - * nop stub, which must not clobber anything *including the stack* to - * avoid confusing the entry prologues. - */ -DEFINE_PARAVIRT_ASM(_paravirt_nop, "", .entry.text); - /* stub always returning 0. */ -DEFINE_PARAVIRT_ASM(paravirt_ret0, "xor %eax,%eax", .entry.text); +DEFINE_ASM_FUNC(paravirt_ret0, "xor %eax,%eax", .entry.text); =20 void __init default_banner(void) { @@ -49,12 +43,6 @@ void __init default_banner(void) pv_info.name); } =20 -/* Undefined instruction for dealing with missing ops pointers. */ -noinstr void paravirt_BUG(void) -{ - BUG(); -} - static unsigned paravirt_patch_call(void *insn_buff, const void *target, unsigned long addr, unsigned len) { @@ -64,11 +52,11 @@ static unsigned paravirt_patch_call(void *insn_buff, co= nst void *target, } =20 #ifdef CONFIG_PARAVIRT_XXL -DEFINE_PARAVIRT_ASM(_paravirt_ident_64, "mov %rdi, %rax", .text); -DEFINE_PARAVIRT_ASM(pv_native_save_fl, "pushf; pop %rax", .noinstr.text); -DEFINE_PARAVIRT_ASM(pv_native_irq_disable, "cli", .noinstr.text); -DEFINE_PARAVIRT_ASM(pv_native_irq_enable, "sti", .noinstr.text); -DEFINE_PARAVIRT_ASM(pv_native_read_cr2, "mov %cr2, %rax", .noinstr.text); +DEFINE_ASM_FUNC(_paravirt_ident_64, "mov %rdi, %rax", .text); +DEFINE_ASM_FUNC(pv_native_save_fl, "pushf; pop %rax", .noinstr.text); +DEFINE_ASM_FUNC(pv_native_irq_disable, "cli", .noinstr.text); +DEFINE_ASM_FUNC(pv_native_irq_enable, "sti", .noinstr.text); +DEFINE_ASM_FUNC(pv_native_read_cr2, "mov %cr2, %rax", .noinstr.text); #endif =20 DEFINE_STATIC_KEY_TRUE(virt_spin_lock_key); @@ -96,9 +84,9 @@ unsigned int paravirt_patch(u8 type, void *insn_buff, uns= igned long addr, unsigned ret; =20 if (opfunc =3D=3D NULL) - /* If there's no function, patch it with paravirt_BUG() */ - ret =3D paravirt_patch_call(insn_buff, paravirt_BUG, addr, len); - else if (opfunc =3D=3D _paravirt_nop) + /* If there's no function, patch it with BUG_func() */ + ret =3D paravirt_patch_call(insn_buff, BUG_func, addr, len); + else if (opfunc =3D=3D nop_func) ret =3D 0; else /* Otherwise call the function. */ diff --git a/arch/x86/xen/irq.c b/arch/x86/xen/irq.c index 6092fea..39982f9 100644 --- a/arch/x86/xen/irq.c +++ b/arch/x86/xen/irq.c @@ -45,7 +45,7 @@ static const typeof(pv_ops) xen_irq_ops __initconst =3D { /* Initial interrupt flag handling only called while interrupts off. */ .save_fl =3D __PV_IS_CALLEE_SAVE(paravirt_ret0), .irq_disable =3D __PV_IS_CALLEE_SAVE(paravirt_nop), - .irq_enable =3D __PV_IS_CALLEE_SAVE(paravirt_BUG), + .irq_enable =3D __PV_IS_CALLEE_SAVE(BUG_func), =20 .safe_halt =3D xen_safe_halt, .halt =3D xen_halt,