From patchwork Fri Apr 14 23:44:19 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Gleixner X-Patchwork-Id: 13212138 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id D2B5FC77B7F for ; Fri, 14 Apr 2023 23:45:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:Date:MIME-Version:References:Subject:Cc :To:From:Message-ID:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To: List-Owner; bh=0R2QDsMCxHGcr5QTUUF2LOt36vC+hPBhBFmQKZp0tkE=; b=kD/K5eOd9SqyO8 wy/upH77QF2aQQvPU2J7AW+LBaFcKiplUFObZe8QE7Atv149zYmhulknQvy/k443vxXONOK5haTdQ j1vApgeDDnY9hjAz6uXclx27h8tarV2/cBagGCgi8rNlTqRaFpWD/CG5RxDdFfqpNKV1jFyWffksU YbM8/Knw1OmDtBJzTr7Q1rzOorQUpuWJQLMCV83G+AEQnKOgU/EKwYM69wkuV/5t1g9wWauh77yov caAQqK4EKua3nhj0pcGCCxiCJhwE84WVGv0lhuSQhenYVkf05zc8X8w61/Me6hmjJGnB8afjbykBQ fvaF1dnvCN9coUwN3wvw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1pnT5l-00Ak9h-32; Fri, 14 Apr 2023 23:44:33 +0000 Received: from galois.linutronix.de ([2a0a:51c0:0:12e:550::1]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1pnT5Z-00Ak0E-1l; Fri, 14 Apr 2023 23:44:23 +0000 Message-ID: <20230414232309.448345494@linutronix.de> DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1681515860; 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=SRk3RrJ8+RSaiZTRwxMk0fG1NuTGaGpFKdBZXu8mJKE=; b=TenZelvKdY6Tx+OsImAHk36b4tbQIR+z0M1WnFpjy8y+51j9W5eVFc7Of6Sf8s0X5uq+xc 6SLC+/lL+CpUg+kTVvDAN1gjqSax0V+tVQNmmxi4coTX5o01NqKtoGfLSsdE0lb320KW1r QEHnIVRUnqLfhZgK+7fQTY+n7WOGwL6ll+eunwu5W5z5A2qnT1aRW5PuasQXgjsBUf/jBU 7xOQ39cpNhzE0/XOurXN0gDhM1Ox280g/R6YyoZtAiatQnNAao3G3M3vKjSts9mlj9G6qX S7eGW9eMYE6lWwqIwp+CRBO4mI9eSSdxCdQI74WXa5fo3DgjCo/bZ5Uwga1FYg== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1681515860; 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=SRk3RrJ8+RSaiZTRwxMk0fG1NuTGaGpFKdBZXu8mJKE=; b=GpdL477IqUbVLYXts40m+nkntEs4l/SFSgjl8WTxVs9fG2Y4NeqfbJbNj3fY+ekDTnUTf2 CVV1j8YeN8LpbeAA== 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 , David Woodhouse , 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 Subject: [patch 04/37] x86/smpboot: Rename start_cpu0() to soft_restart_cpu() References: <20230414225551.858160935@linutronix.de> MIME-Version: 1.0 Date: Sat, 15 Apr 2023 01:44:19 +0200 (CEST) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230414_164421_891709_F0CB040E X-CRM114-Status: GOOD ( 13.55 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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 == ret_from_fork) return true; #ifdef CONFIG_HOTPLUG_CPU - if (dest == start_cpu0) + if (dest == 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) #ifdef CONFIG_HOTPLUG_CPU /* - * Boot CPU0 entry point. It's called from play_dead(). Everything has been 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 /* --- a/arch/x86/kernel/head_64.S +++ b/arch/x86/kernel/head_64.S @@ -377,11 +377,11 @@ SYM_CODE_END(secondary_startup_64) #ifdef CONFIG_HOTPLUG_CPU /* - * Boot CPU0 entry point. It's called from play_dead(). Everything has been 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_EMPTY @@ -390,7 +390,7 @@ SYM_CODE_START(start_cpu0) movq TASK_threadsp(%rcx), %rsp jmp .Ljump_to_C_code -SYM_CODE_END(start_cpu0) +SYM_CODE_END(soft_restart_cpu) #endif #ifdef CONFIG_AMD_MEM_ENCRYPT --- a/arch/x86/kernel/sev.c +++ b/arch/x86/kernel/sev.c @@ -1326,7 +1326,7 @@ 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