From patchwork Thu Feb 23 19:11:28 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Usama Arif X-Patchwork-Id: 13150690 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 6A9BEC6FA8E for ; Thu, 23 Feb 2023 19:13:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232193AbjBWTNA (ORCPT ); Thu, 23 Feb 2023 14:13:00 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60034 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231952AbjBWTMz (ORCPT ); Thu, 23 Feb 2023 14:12:55 -0500 Received: from mail-wr1-x42d.google.com (mail-wr1-x42d.google.com [IPv6:2a00:1450:4864:20::42d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C08F853EE2 for ; Thu, 23 Feb 2023 11:12:04 -0800 (PST) Received: by mail-wr1-x42d.google.com with SMTP id 6so11155824wrb.11 for ; Thu, 23 Feb 2023 11:12:04 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bytedance.com; s=google; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=XOS0veLLHWbwjK4eBBnp5I1m+3QaoysNm8QvFRgjkAM=; b=NoWOE1juav4B2EzO3sYoVjYk0WKOVpH+oBqfJvi8ziGJ5mMnDNe/17x0Nm8VQqmURH jY8DM7OfXqdvo5ko0NXGNMAlL5gcbkXkBJMqg8CCEhEKhV+mo7JGd5Eb2STH9IxN4NQ9 Pj37RCtxE8VmbCkvm+ZXgra2t3hGXDanm1NNyyJo+1lOxO0RH89t5omOv3wUVU2rjXKX j/DjsDZcG+nlc2VAh72E4AKUTGT+o83suYwYv/0uOVFtpomc1sc4RlNxNBSZZCsUlQ9q 6pdpGFhIkU3joQO/TUf35xtYje4X3s+Ld6DQfDWvGet+hI8aAcYpXOaKjPpcqUlbDxPF 2viQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=XOS0veLLHWbwjK4eBBnp5I1m+3QaoysNm8QvFRgjkAM=; b=bQVciF3pfReZrqjutnNN9ae+dk5M6o93c+PMwf6KtHfA+5I06L6RFugDLtCYcLr/Hn mz5F1ympuNibdL8koZuf2xFTgt8WTeos9zxpD0gvcE3yhgBxW6xxrjXBBIFZNdk6V9ov Hk7uvMsx1UlAbo8uyclUjh7zJlPRudL18lumtBEyAwwx3u79Vlxd3UqGjwI5E4lf17n3 DaJa/emGk4muMjaKPou+EFh7bi+km56J+zOe/TtsmfvHx3/+QzKAaOM5HwyuthWQI3Kr /F1RNFT1YAnQqdMTj6addA1CHaVHKs/7Y6InWbI0yOrxEMRTkCS4JC7enk+MjetY+joj DThQ== X-Gm-Message-State: AO0yUKVhaFJQkwAIikxOuv9E38NgN38OW9Z1TIn4QXcKK7DvES9Te6pm vCBZUKgv5OAthV0SRMvZgbsW9Q== X-Google-Smtp-Source: AK7set8v9uJ+aFQdjGSLkOj7taqgBaP0/g1nSEOHlxeNkTiapiOF09lwMSzf83LJfhH/le9sXkYJUQ== X-Received: by 2002:a5d:6290:0:b0:2c7:1a86:aecd with SMTP id k16-20020a5d6290000000b002c71a86aecdmr532807wru.2.1677179503081; Thu, 23 Feb 2023 11:11:43 -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.45.2023.02.23.11.11.41 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 23 Feb 2023 11:11:42 -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, Usama Arif Subject: [PATCH v11 00/12] Parallel CPU bringup for x86_64 Date: Thu, 23 Feb 2023 19:11:28 +0000 Message-Id: <20230223191140.4155012-1-usama.arif@bytedance.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org This version includes the work done by Brian Gerst (https://lore.kernel.org/all/20230222221301.245890-1-brgerst@gmail.com/) to remove the global variables initial_gs, initial_stack, and early_gdt_descr from the 64-bit boot code. The first 2 patches have been squashed with patch 6, while the last 4 patches for removing the global variables and simplifying boot setup are added on top of the series. Thanks, Usama Changes across versions: v2: Cut it back to just INIT/SIPI/SIPI in parallel for now, nothing more v3: Clean up x2apic patch, add MTRR optimisation, lock topology update in preparation for more parallelisation. v4: Fixes to the real mode parallelisation patch spotted by SeanC, to avoid scribbling on initial_gs in common_cpu_up(), and to allow all 24 bits of the physical X2APIC ID to be used. That patch still needs a Signed-off-by from its original author, who once claimed not to remember writing it at all. But now we've fixed it, hopefully he'll admit it now :) v5: rebase to v6.1 and remeasure performance, disable parallel bringup for AMD CPUs. v6: rebase to v6.2-rc6, disabled parallel boot on amd as a cpu bug and reused timer calibration for secondary CPUs. v7: [David Woodhouse] iterate over all possible CPUs to find any existing cluster mask in alloc_clustermask. (patch 1/9) Keep parallel AMD support enabled in AMD, using APIC ID in CPUID leaf 0x0B (for x2APIC mode) or CPUID leaf 0x01 where 8 bits are sufficient. Included sanity checks for APIC id from 0x0B. (patch 6/9) Removed patch for reusing timer calibration for secondary CPUs. commit message and code improvements. v8: Fix CPU0 hotplug by setting up the initial_gs, initial_stack and early_gdt_descr. Drop trampoline lock and bail if APIC ID not found in find_cpunr. Code comments improved and debug prints added. v9: Drop patch to avoid repeated saves of MTRR at boot time. rebased and retested at v6.2-rc8. added kernel doc for no_parallel_bringup and made do_parallel_bringup __ro_after_init. v10: Fixed suspend/resume not working with parallel smpboot. rebased and retested to 6.2. fixed checkpatch errors. v11: Added patches from Brian Gerst to remove the global variables initial_gs, initial_stack, and early_gdt_descr from the 64-bit boot code (https://lore.kernel.org/all/20230222221301.245890-1-brgerst@gmail.com/). Brian Gerst (4): x86/smpboot: Remove initial_stack on 64-bit x86/smpboot: Remove early_gdt_descr on 64-bit x86/smpboot: Remove initial_gs x86/smpboot: Simplify boot CPU setup David Woodhouse (8): x86/apic/x2apic: Allow CPU cluster_mask to be populated in parallel cpu/hotplug: Move idle_thread_get() to cpu/hotplug: Add dynamic parallel bringup states before CPUHP_BRINGUP_CPU x86/smpboot: Reference count on smpboot_setup_warm_reset_vector() x86/smpboot: Split up native_cpu_up into separate phases and document them x86/smpboot: Support parallel startup of secondary CPUs x86/smpboot: Send INIT/SIPI/SIPI to secondary CPUs in parallel x86/smpboot: Serialize topology updates for secondary bringup .../admin-guide/kernel-parameters.txt | 3 + arch/x86/include/asm/processor.h | 6 +- arch/x86/include/asm/realmode.h | 4 +- arch/x86/include/asm/smp.h | 13 +- arch/x86/include/asm/topology.h | 2 - arch/x86/kernel/acpi/sleep.c | 12 +- arch/x86/kernel/apic/apic.c | 2 +- arch/x86/kernel/apic/x2apic_cluster.c | 126 ++++--- arch/x86/kernel/asm-offsets.c | 1 + arch/x86/kernel/cpu/common.c | 6 +- arch/x86/kernel/head_64.S | 125 +++++-- arch/x86/kernel/smpboot.c | 350 +++++++++++++----- arch/x86/realmode/init.c | 3 + arch/x86/realmode/rm/trampoline_64.S | 14 + arch/x86/xen/smp_pv.c | 4 +- arch/x86/xen/xen-head.S | 2 +- include/linux/cpuhotplug.h | 2 + include/linux/smpboot.h | 7 + kernel/cpu.c | 31 +- kernel/smpboot.h | 2 - 20 files changed, 525 insertions(+), 190 deletions(-)