From patchwork Fri Apr 14 23:44:24 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Gleixner X-Patchwork-Id: 13212174 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 6EB1AC77B77 for ; Fri, 14 Apr 2023 23:44:54 +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=oda7gLFr6uY7PnMO8qmJqtdOLd97YUzzVNuJXHKMXes=; b=nWTN0c8Pzc4y25 XnuPEl7TiwS7gApxUSCl8WEI3dUcX2kiapdrKuy/NxIkr1HUcZ7ZQ1vLH2n03djC7g+S9HukoS2P3 2WM9xksxP7mCkdLnTt1Lo2FGm4a6KCOTpR6b7koN5ZE/aCxSAzs5etfaDxjlqadyIUCMRHfXjiZGg wLIfI9R8Nwmn20sxsHjWQnBLMnRk7QF0+tJfLS+Jl5LBeYpPuMbEkgsU0CNWFPs1Usddp1GXsETGk EtrLi01tQKldBbTTClj8VR8hcXkcGbvpVURxoblImN+27zYpy+w2cG+9I4aeQtfXEM8QXTljv1/6J eI6wUPp9NxV6Iuu6PySQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1pnT5x-00AkLj-1Y; Fri, 14 Apr 2023 23:44:45 +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 1pnT5e-00Ak39-2I; Fri, 14 Apr 2023 23:44:28 +0000 Message-ID: <20230414232309.634953473@linutronix.de> DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1681515865; 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=yXU88DPM4+gDgwwKQLancKUxDjIhod/zoYFzhLlkywE=; b=uB/cdoo+FiKgxcyt6ua+eofd7Uy6FRsG6/M919LHeLaRDCm0uyHoc5a1FuwimG9z0Kg1xr I101+cnRHFikD4fqEm6lZOTxsA3yV9LXW61rrHUVlF3AiOWiBC00yRq0VhWdSwUelUpctI 5IcE3x4R3zXRKbqt7SSBKBa4oYiQTpXazjMN/L2oMlO9K+07Nyr22exnb4k00l3spzvmVc 9LRa6JkEMAonr+NJM4O1ggTmXWPqwz4bV0FKYjWVuxuelWC7S0/bYUbnT566jHXu359fFE 1kF7NH3ihq64cycQYcnuOz7AxFm2QZeP5t1J5QjP8JiYPJKiwyKDhh8WCXeClA== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1681515865; 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=yXU88DPM4+gDgwwKQLancKUxDjIhod/zoYFzhLlkywE=; b=MdNuozlhNGUku1R1Tw5i7+TfSWnt88h5jzNnGTOji+filOi1PFWkM9UpldmpxTl1Bs6qoB RP/SXlqo2sMOuJDA== 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 07/37] x86/smpboot: Restrict soft_restart_cpu() to SEV References: <20230414225551.858160935@linutronix.de> MIME-Version: 1.0 Date: Sat, 15 Apr 2023 01:44:24 +0200 (CEST) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230414_164426_895001_04C0E332 X-CRM114-Status: GOOD ( 10.61 ) X-BeenThere: linux-riscv@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-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org Now that the CPU0 hotplug cruft is gone, the only user is AMD SEV. Signed-off-by: Thomas Gleixner Cc: Tom Lendacky --- arch/x86/kernel/callthunks.c | 2 +- arch/x86/kernel/head_32.S | 14 -------------- arch/x86/kernel/head_64.S | 2 +- 3 files changed, 2 insertions(+), 16 deletions(-) --- a/arch/x86/kernel/callthunks.c +++ b/arch/x86/kernel/callthunks.c @@ -133,7 +133,7 @@ static bool skip_addr(void *dest) /* Accounts directly */ if (dest == ret_from_fork) return true; -#ifdef CONFIG_HOTPLUG_CPU +#if defined(CONFIG_HOTPLUG_CPU) && defined(CONFIG_AMD_MEM_ENCRYPT) if (dest == soft_restart_cpu) return true; #endif --- a/arch/x86/kernel/head_32.S +++ b/arch/x86/kernel/head_32.S @@ -138,20 +138,6 @@ SYM_CODE_START(startup_32) jmp .Ldefault_entry SYM_CODE_END(startup_32) -#ifdef CONFIG_HOTPLUG_CPU -/* - * 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(soft_restart_cpu) - movl initial_stack, %ecx - movl %ecx, %esp - call *(initial_code) -1: jmp 1b -SYM_FUNC_END(soft_restart_cpu) -#endif - /* * Non-boot CPU entry point; entered from trampoline.S * We can't lgdt here, because lgdt itself uses a data segment, but --- a/arch/x86/kernel/head_64.S +++ b/arch/x86/kernel/head_64.S @@ -375,7 +375,7 @@ SYM_CODE_END(secondary_startup_64) #include "verify_cpu.S" #include "sev_verify_cbit.S" -#ifdef CONFIG_HOTPLUG_CPU +#if defined(CONFIG_HOTPLUG_CPU) && defined(CONFIG_AMD_MEM_ENCRYPT) /* * 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