From patchwork Thu Feb 23 19:11:37 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Usama Arif X-Patchwork-Id: 13150708 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 7B65CC64ED8 for ; Thu, 23 Feb 2023 19:13:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232344AbjBWTNl (ORCPT ); Thu, 23 Feb 2023 14:13:41 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60680 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232235AbjBWTNO (ORCPT ); Thu, 23 Feb 2023 14:13:14 -0500 Received: from mail-wm1-x32e.google.com (mail-wm1-x32e.google.com [IPv6:2a00:1450:4864:20::32e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A91835C161 for ; Thu, 23 Feb 2023 11:12:24 -0800 (PST) Received: by mail-wm1-x32e.google.com with SMTP id j19-20020a05600c1c1300b003e9b564fae9so287697wms.2 for ; Thu, 23 Feb 2023 11:12:24 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bytedance.com; s=google; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=wL4H6dkwiqQh7dcmIrLqt3HZrti5VJpIfMc44frmzHc=; b=Z+5BzDDrPRuwK1aoLnVaWnL5dhdfm1qA4XC8szYEgLwxcNNkKR7N1jrdZUW8KEWp0r ooYGJUtsbba00Y/hcT4cdNn2uc+6w59DOT51XHq8wkNlj1qgwWVTvjDjUiFC3ZFQToAM Ms/4rjIXTj2kdOLZklcn7MemtWoO5VOYBGMjSb5QcoQKZg2bNnOZRgeY3otdukJX0KNl BffMhFJReoM18BJOkeYVYcZVKuaGFxn5NJNeSccfuIgvSMAAOL6Gq4tvOWjQeorYSe8d JHZI4Woj5seaPOAbsH+RKe4gXlSOJ5xsX4e0EjXjAxBad9J0hkle5NxDW9QiNVwK7Dd4 3Jng== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=wL4H6dkwiqQh7dcmIrLqt3HZrti5VJpIfMc44frmzHc=; b=UkR3Ut0j5cjeLuBiDqRlj4Tr5fVdvjNvChVBkNkQw7MUCSmLsb9sza2S9K5CLJK7kq vMRZ266t/+tDprd3icKjrmdLIxPByYsfQpJvzsOzf/DK6uHuGecwxpGUdt3OYnj2uitI mi+WpFo/5cjqr7o7UxahUlXwrCAuN0JjgIOnG1mfJcQNuCaKRqEWKhVW2a7EYQOiCUaw hAFqkB66YaBSVjCkNt6ZKUVRK2yI39kvqY6YWNItJSzEwAmU9hhrjbfuaE/xX8YnODba RiJwIyWfazvDvKUc3wy5HJpaEacaR8lqDOzze+1P+ofdclxFsj5K1IDp06sRNFY0W71s uV2g== X-Gm-Message-State: AO0yUKXcjMwPnVDGrbRdx+EYCTQaEq4sh/uMdyXz/eQIOm+OhBSRyROl smCWAwTrcw1xgMA/91dbYVnoLA== X-Google-Smtp-Source: AK7set/i/tUmeSAqCjCLwUvGyPjzOdFNkTGXwh64luEnmTYt0vhptfrKuJRFKMaio2gKHRJgbXUy3w== X-Received: by 2002:a05:600c:3b9f:b0:3e9:9fc5:2c6d with SMTP id n31-20020a05600c3b9f00b003e99fc52c6dmr4257178wms.14.1677179511475; Thu, 23 Feb 2023 11:11:51 -0800 (PST) Received: from usaari01.cust.communityfibre.co.uk ([2a02:6b6a:b566:0:5ee0:5af0:64bd:6198]) by smtp.gmail.com with ESMTPSA id b15-20020a5d4b8f000000b002c561805a4csm12957286wrt.45.2023.02.23.11.11.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 23 Feb 2023 11:11:51 -0800 (PST) From: Usama Arif To: dwmw2@infradead.org, tglx@linutronix.de, kim.phillips@amd.com, brgerst@gmail.com Cc: piotrgorski@cachyos.org, oleksandr@natalenko.name, arjan@linux.intel.com, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, hpa@zytor.com, x86@kernel.org, pbonzini@redhat.com, paulmck@kernel.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, rcu@vger.kernel.org, mimoja@mimoja.de, hewenliang4@huawei.com, thomas.lendacky@amd.com, seanjc@google.com, pmenzel@molgen.mpg.de, fam.zheng@bytedance.com, punit.agrawal@bytedance.com, simon.evans@bytedance.com, liangma@liangbit.com, David Woodhouse , Usama Arif Subject: [PATCH v11 09/12] x86/smpboot: Remove initial_stack on 64-bit Date: Thu, 23 Feb 2023 19:11:37 +0000 Message-Id: <20230223191140.4155012-10-usama.arif@bytedance.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230223191140.4155012-1-usama.arif@bytedance.com> References: <20230223191140.4155012-1-usama.arif@bytedance.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: rcu@vger.kernel.org From: Brian Gerst Load RSP from current_task->thread.sp instead. Signed-off-by: Brian Gerst Reviewed-by: David Woodhouse Signed-off-by: David Woodhouse Tested-by: Usama Arif Signed-off-by: Usama Arif --- arch/x86/include/asm/processor.h | 6 +++++- arch/x86/kernel/acpi/sleep.c | 2 +- arch/x86/kernel/head_64.S | 35 ++++++++++++++++++-------------- arch/x86/xen/xen-head.S | 2 +- 4 files changed, 27 insertions(+), 18 deletions(-) diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h index 4e35c66edeb7..9c4a5c4d46c1 100644 --- a/arch/x86/include/asm/processor.h +++ b/arch/x86/include/asm/processor.h @@ -648,7 +648,11 @@ static inline void spin_lock_prefetch(const void *x) #define KSTK_ESP(task) (task_pt_regs(task)->sp) #else -#define INIT_THREAD { } +extern unsigned long __end_init_task[]; + +#define INIT_THREAD { \ + .sp = (unsigned long)&__end_init_task - PTREGS_SIZE, \ +} extern unsigned long KSTK_ESP(struct task_struct *task); diff --git a/arch/x86/kernel/acpi/sleep.c b/arch/x86/kernel/acpi/sleep.c index 47e75c056cb5..008fda8b1982 100644 --- a/arch/x86/kernel/acpi/sleep.c +++ b/arch/x86/kernel/acpi/sleep.c @@ -113,7 +113,7 @@ int x86_acpi_suspend_lowlevel(void) saved_magic = 0x12345678; #else /* CONFIG_64BIT */ #ifdef CONFIG_SMP - initial_stack = (unsigned long)temp_stack + sizeof(temp_stack); + current->thread.sp = (unsigned long)temp_stack + sizeof(temp_stack); early_gdt_descr.address = (unsigned long)get_cpu_gdt_rw(smp_processor_id()); initial_gs = per_cpu_offset(smp_processor_id()); diff --git a/arch/x86/kernel/head_64.S b/arch/x86/kernel/head_64.S index c32e5b06a9ce..f7905ba4b992 100644 --- a/arch/x86/kernel/head_64.S +++ b/arch/x86/kernel/head_64.S @@ -62,8 +62,8 @@ SYM_CODE_START_NOALIGN(startup_64) * tables and then reload them. */ - /* Set up the stack for verify_cpu(), similar to initial_stack below */ - leaq (__end_init_task - FRAME_SIZE)(%rip), %rsp + /* Set up the stack for verify_cpu() */ + leaq (__end_init_task - PTREGS_SIZE)(%rip), %rsp leaq _text(%rip), %rdi @@ -245,11 +245,11 @@ SYM_INNER_LABEL(secondary_startup_64_no_verify, SYM_L_GLOBAL) #ifdef CONFIG_SMP /* * Is this the boot CPU coming up? If so everything is available - * in initial_gs, initial_stack and early_gdt_descr. + * in initial_gs and early_gdt_descr. */ movl smpboot_control(%rip), %edx testl $STARTUP_SECONDARY, %edx - jz .Lsetup_cpu + jz .Linit_cpu0_data /* * For parallel boot, the APIC ID is retrieved from CPUID, and then @@ -302,6 +302,10 @@ SYM_INNER_LABEL(secondary_startup_64_no_verify, SYM_L_GLOBAL) hlt jmp 1b +.Linit_cpu0_data: + movq __per_cpu_offset(%rip), %rdx + jmp .Lsetup_cpu + .Linit_cpu_data: /* Get the per cpu offset for the given CPU# which is in ECX */ leaq __per_cpu_offset(%rip), %rbx @@ -314,13 +318,21 @@ SYM_INNER_LABEL(secondary_startup_64_no_verify, SYM_L_GLOBAL) addq %rbx, %rcx movq %rcx, early_gdt_descr_base(%rip) - /* Find the idle task stack */ - movq pcpu_hot + X86_current_task(%rbx), %rcx - movq TASK_threadsp(%rcx), %rcx - movq %rcx, initial_stack(%rip) + movq %rbx, %rdx +#else + xorl %edx, %edx #endif /* CONFIG_SMP */ .Lsetup_cpu: + /* + * Setup a boot time stack - Any secondary CPU will have lost its stack + * by now because the cr3-switch above unmaps the real-mode stack + * + * RDX contains the per-cpu offset + */ + movq pcpu_hot + X86_current_task(%rdx), %rax + movq TASK_threadsp(%rax), %rsp + /* * We must switch to a new descriptor in kernel space for the GDT * because soon the kernel won't have access anymore to the userspace @@ -355,12 +367,6 @@ SYM_INNER_LABEL(secondary_startup_64_no_verify, SYM_L_GLOBAL) movl initial_gs+4(%rip),%edx wrmsr - /* - * Setup a boot time stack - Any secondary CPU will have lost its stack - * by now because the cr3-switch above unmaps the real-mode stack - */ - movq initial_stack(%rip), %rsp - /* Drop the realmode protection. For the boot CPU the pointer is NULL! */ movq trampoline_lock(%rip), %rax testq %rax, %rax @@ -517,7 +523,6 @@ SYM_DATA(initial_vc_handler, .quad handle_vc_boot_ghcb) * The FRAME_SIZE gap is a convention which helps the in-kernel unwinder * reliably detect the end of the stack. */ -SYM_DATA(initial_stack, .quad init_thread_union + THREAD_SIZE - FRAME_SIZE) SYM_DATA(trampoline_lock, .quad 0); __FINITDATA diff --git a/arch/x86/xen/xen-head.S b/arch/x86/xen/xen-head.S index ffaa62167f6e..6bd391476656 100644 --- a/arch/x86/xen/xen-head.S +++ b/arch/x86/xen/xen-head.S @@ -49,7 +49,7 @@ SYM_CODE_START(startup_xen) ANNOTATE_NOENDBR cld - mov initial_stack(%rip), %rsp + leaq (__end_init_task - PTREGS_SIZE)(%rip), %rsp /* Set up %gs. *