From nobody Mon Feb 9 05:59:10 2026 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; envelope-from=xen-devel-bounces@lists.xenproject.org; helo=lists.xenproject.org; Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org; dmarc=pass(p=none dis=none) header.from=linutronix.de ARC-Seal: i=1; a=rsa-sha256; t=1683226970; cv=none; d=zohomail.com; s=zohoarc; b=RmsppyAbSg9LOaJHSXgJaydDMNhBkWDai7oSzLTwTufEvcgbvkP+OSKfwcKHUYxxBt6yIPHm55dqTRDpy5MhkWGv6x97TuqJGAMd9tMtaKLbdXRh/5uVD+gsWjvTFP8nsYxneMUiwO24pHbQ9GGwlEvA9YbE9VPmP4GE7qUWZTw= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1683226970; h=Content-Type:Cc:Date:From:List-Subscribe:List-Post:List-Id:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:To; bh=4k8WG2dAJ3uFYn2Qtg5bZA2RHhZEaXZ+bewsd+BJr/I=; b=jyJKRNGAIegVaCxfaXHW0gSaCDfgGoLnvMsmxqcNg6CmLnQN6eJRsWxSiz8E2ATNQmPTKDrXwHVwzTLAX0quFjNLnjCJa0/z5ZL/Lz8oLivrOB/3Pk1pDCV7Zefrs2tkVznpNJSf81G453W6DA6GwQMpE/rml/ZjSVfKDLPFEm4= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org; dmarc=pass header.from= (p=none dis=none) Return-Path: Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) by mx.zohomail.com with SMTPS id 1683226970345592.6096765772097; Thu, 4 May 2023 12:02:50 -0700 (PDT) Received: from list by lists.xenproject.org with outflank-mailman.529888.824853 (Exim 4.92) (envelope-from ) id 1pueDR-00054I-3v; Thu, 04 May 2023 19:02:09 +0000 Received: by outflank-mailman (output) from mailman id 529888.824853; Thu, 04 May 2023 19:02:09 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1pueDR-00054B-0y; Thu, 04 May 2023 19:02:09 +0000 Received: by outflank-mailman (input) for mailman id 529888; Thu, 04 May 2023 19:02:07 +0000 Received: from se1-gles-flk1-in.inumbo.com ([94.247.172.50] helo=se1-gles-flk1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1pueDP-00042k-ES for xen-devel@lists.xenproject.org; Thu, 04 May 2023 19:02:07 +0000 Received: from galois.linutronix.de (galois.linutronix.de [193.142.43.55]) by se1-gles-flk1.inumbo.com (Halon) with ESMTPS id 294fb817-eaae-11ed-8611-37d641c3527e; Thu, 04 May 2023 21:02:05 +0200 (CEST) X-Outflank-Mailman: Message body and most headers restored to incoming version X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: 294fb817-eaae-11ed-8611-37d641c3527e Message-ID: <20230504185936.536756506@linutronix.de> DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1683226925; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: references:references; bh=4k8WG2dAJ3uFYn2Qtg5bZA2RHhZEaXZ+bewsd+BJr/I=; b=bBh0CVpZWL+6hsvPUZtXnSdOBPa/K5CfY4sntqqXgNMtxpi+d2yUs3ECpJ289P0ZQAUrXv k7Gw7YnHFskIzQ/7fPEMWNfUyqW1tXD0Y5j9mjC9fHiZESm2nV58xOjcYTcUtICW4PGtib L7qAfpVjhgaAOAD2zQ57omRWjLADm+xmVTWvdqyhIzFRzilnUByYjHcwGeBKFMcYVRiiaY VaFLAq4WMscxLSALxvyX5KYN3LoP2rAtooUlf6qigkW3PSIl7OwVv0Em5tfeehe2sTShbV Tm0yzzDkfXdyeVnTbNUMouES/vmiS2pcR636jskZtx14ouKlyWxaen2mjAF6Eg== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1683226925; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: references:references; bh=4k8WG2dAJ3uFYn2Qtg5bZA2RHhZEaXZ+bewsd+BJr/I=; b=zT9oEAybbsH/w7G2lAyNh7UEoHso+OvSBYaHY787eM4NlqSRBZnZMUdOCeyvsS0fDgQH3V RekIpVEMD5NisxDQ== From: Thomas Gleixner To: LKML Cc: x86@kernel.org, David Woodhouse , Andrew Cooper , Brian Gerst , Arjan van de Veen , Paolo Bonzini , Paul McKenney , Tom Lendacky , Sean Christopherson , Oleksandr Natalenko , Paul Menzel , "Guilherme G. Piccoli" , Piotr Gorski , Usama Arif , Juergen Gross , Boris Ostrovsky , xen-devel@lists.xenproject.org, Russell King , Arnd Bergmann , linux-arm-kernel@lists.infradead.org, Catalin Marinas , Will Deacon , Guo Ren , linux-csky@vger.kernel.org, Thomas Bogendoerfer , linux-mips@vger.kernel.org, "James E.J. Bottomley" , Helge Deller , linux-parisc@vger.kernel.org, Paul Walmsley , Palmer Dabbelt , linux-riscv@lists.infradead.org, Mark Rutland , Sabin Rapan , "Michael Kelley (LINUX)" Subject: [patch V2 04/38] x86/smpboot: Rename start_cpu0() to soft_restart_cpu() References: <20230504185733.126511787@linutronix.de> MIME-Version: 1.0 Date: Thu, 4 May 2023 21:02:04 +0200 (CEST) X-ZohoMail-DKIM: pass (identity @linutronix.de) X-ZM-MESSAGEID: 1683226972589100001 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Thomas Gleixner This is used in the SEV play_dead() implementation to re-online CPUs. But that has nothing to do with CPU0. Signed-off-by: Thomas Gleixner Cc: Tom Lendacky --- arch/x86/include/asm/cpu.h | 2 +- arch/x86/kernel/callthunks.c | 2 +- arch/x86/kernel/head_32.S | 10 +++++----- arch/x86/kernel/head_64.S | 10 +++++----- arch/x86/kernel/sev.c | 2 +- 5 files changed, 13 insertions(+), 13 deletions(-) --- --- a/arch/x86/include/asm/cpu.h +++ b/arch/x86/include/asm/cpu.h @@ -30,7 +30,7 @@ struct x86_cpu { #ifdef CONFIG_HOTPLUG_CPU extern int arch_register_cpu(int num); extern void arch_unregister_cpu(int); -extern void start_cpu0(void); +extern void soft_restart_cpu(void); #ifdef CONFIG_DEBUG_HOTPLUG_CPU0 extern int _debug_hotplug_cpu(int cpu, int action); #endif --- a/arch/x86/kernel/callthunks.c +++ b/arch/x86/kernel/callthunks.c @@ -134,7 +134,7 @@ static bool skip_addr(void *dest) if (dest =3D=3D ret_from_fork) return true; #ifdef CONFIG_HOTPLUG_CPU - if (dest =3D=3D start_cpu0) + if (dest =3D=3D soft_restart_cpu) return true; #endif #ifdef CONFIG_FUNCTION_TRACER --- a/arch/x86/kernel/head_32.S +++ b/arch/x86/kernel/head_32.S @@ -140,16 +140,16 @@ SYM_CODE_END(startup_32) =20 #ifdef CONFIG_HOTPLUG_CPU /* - * Boot CPU0 entry point. It's called from play_dead(). Everything has bee= n set - * up already except stack. We just set up stack here. Then call - * start_secondary(). + * Entry point for soft restart of a CPU. Invoked from xxx_play_dead() for + * restarting the boot CPU or for restarting SEV guest CPUs after CPU hot + * unplug. Everything is set up already except the stack. */ -SYM_FUNC_START(start_cpu0) +SYM_FUNC_START(soft_restart_cpu) movl initial_stack, %ecx movl %ecx, %esp call *(initial_code) 1: jmp 1b -SYM_FUNC_END(start_cpu0) +SYM_FUNC_END(soft_restart_cpu) #endif =20 /* --- a/arch/x86/kernel/head_64.S +++ b/arch/x86/kernel/head_64.S @@ -377,11 +377,11 @@ SYM_CODE_END(secondary_startup_64) =20 #ifdef CONFIG_HOTPLUG_CPU /* - * Boot CPU0 entry point. It's called from play_dead(). Everything has bee= n set - * up already except stack. We just set up stack here. Then call - * start_secondary() via .Ljump_to_C_code. + * Entry point for soft restart of a CPU. Invoked from xxx_play_dead() for + * restarting the boot CPU or for restarting SEV guest CPUs after CPU hot + * unplug. Everything is set up already except the stack. */ -SYM_CODE_START(start_cpu0) +SYM_CODE_START(soft_restart_cpu) ANNOTATE_NOENDBR UNWIND_HINT_END_OF_STACK =20 @@ -390,7 +390,7 @@ SYM_CODE_START(start_cpu0) movq TASK_threadsp(%rcx), %rsp =20 jmp .Ljump_to_C_code -SYM_CODE_END(start_cpu0) +SYM_CODE_END(soft_restart_cpu) #endif =20 #ifdef CONFIG_AMD_MEM_ENCRYPT --- a/arch/x86/kernel/sev.c +++ b/arch/x86/kernel/sev.c @@ -1328,7 +1328,7 @@ static void sev_es_play_dead(void) * If we get here, the VCPU was woken up again. Jump to CPU * startup code to get it back online. */ - start_cpu0(); + soft_restart_cpu(); } #else /* CONFIG_HOTPLUG_CPU */ #define sev_es_play_dead native_play_dead