From patchwork Tue Mar 28 19:57:50 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Usama Arif X-Patchwork-Id: 13191491 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 6FEE5C76196 for ; Tue, 28 Mar 2023 19:58:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229756AbjC1T6k (ORCPT ); Tue, 28 Mar 2023 15:58:40 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42654 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229749AbjC1T6g (ORCPT ); Tue, 28 Mar 2023 15:58:36 -0400 Received: from mail-wr1-x436.google.com (mail-wr1-x436.google.com [IPv6:2a00:1450:4864:20::436]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D27073C0F for ; Tue, 28 Mar 2023 12:58:01 -0700 (PDT) Received: by mail-wr1-x436.google.com with SMTP id j24so13447175wrd.0 for ; Tue, 28 Mar 2023 12:58:01 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bytedance.com; s=google; t=1680033480; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=idaRv/1WNtgD31Z/L8uF4ozvP49BG2CNqJUpm5ENzNo=; b=h0HwqvAwn7NMrvh8dGUsAvz1Ej/b4pwBLxpXDXHR5qNmeVNgbBKWlDIxB0Fqdn4+Iw 7OuB6jiqgPMXPUfCO27xpwIiRRn15SMLlwDdDhkEEJN99zIp09WUYtk3T03EVhhXamHz DKpfWOJA0ZiEby8Kwe/C9jK3NFYVeCRVnocCGhc5P6u1qrE4AZqbvWWt9xylcp3wt0Ip vP540dw8F3G8deLwf7FxfrnTl9FuKC6U2j/uVe3lSTtdTrCK/pJ84p2Y+f0ZELkMuHYs KaO0zz39EI5QCTfuAtOf3xdY1zxbJSslkt17ueuB9WwW/ujq8v+HKFRClT5mULHTi94c aoqQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; t=1680033480; 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=idaRv/1WNtgD31Z/L8uF4ozvP49BG2CNqJUpm5ENzNo=; b=Ujv176CGEdtQzQ+IxrfRZuIzty0ptPddnxjUVxbFOYJ6s8Lb5SNs8ClTuHIYM5ETLa 8uUj2ybJT4Wfcqc2hkhROQH3PUKdO960ziN6WzjKNK0GbdvtgKgKQKjSCAhmN2UIlUzA mCz7ZGE85hd6hUDauFSzcmRhg66LWTFjuKxvbjjX5Ni+N1zbNJsi1w4C9lVO204R6pGC /3fTJ3pOrPazRSO0wofxiOr988HJK5fjVeG5aVR2TjJwwbjRNCT6tvgcQ1w2HSKIPAF+ kCOa23gdKmGrXwqBesWFfEFHfzMzvFGwxXEETgGTMqVrIXdTymBP98qkcQwhw+GeFAlX qF3Q== X-Gm-Message-State: AAQBX9czD1SpFG+8nH7ZfSjeqapXbp+GdRFK+e0SuqXzeuVIRryIwsQC 75hWtYjiAWz+NFZPuSofj3jGCw== X-Google-Smtp-Source: AKy350Z5+R5FQg0B9g0Y0cMHXVv2gCrgJTtFbuQ/pJw3xdq+3Ijd4RltJXROCRkpSQr8rVIx5vc6FA== X-Received: by 2002:a5d:452e:0:b0:2cf:ef01:1def with SMTP id j14-20020a5d452e000000b002cfef011defmr12842417wra.30.1680033480304; Tue, 28 Mar 2023 12:58:00 -0700 (PDT) Received: from usaari01.cust.communityfibre.co.uk ([2a02:6b6a:b566:0:8445:3123:91d7:959d]) by smtp.gmail.com with ESMTPSA id z6-20020a056000110600b002c557f82e27sm28248386wrw.99.2023.03.28.12.57.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 28 Mar 2023 12:57:59 -0700 (PDT) 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, gpiccoli@igalia.com, Usama Arif Subject: [PATCH v17 0/8] Parallel CPU bringup for x86_64 Date: Tue, 28 Mar 2023 20:57:50 +0100 Message-Id: <20230328195758.1049469-1-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 changes the number of cpuhp_states reserved for parallel bringup from 4 (CPUHP_BP_PARALLEL_DYN to CPUHP_BP_PARALLEL_DYN_END) to 1 CPUHP_BP_PARALLEL_STARTUP. 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/). v12: Fixed compilation errors, acquire tr_lock for every stack setup in trampoline_64.S. Rearranged commits for a cleaner git history. v13: Fix build error with CONFIG_FORCE_NR_CPUS. Commit message improved, typos fixed and extra comments added. v14: Enable parallel bringup for SEV-ES guests. v15: use vendor parallel_smp when platform has CC_ATTR_GUEST_STATE_ENCRYPT. Call smpboot_restore_warm_reset_vector incase any of the steps in native_cpu_up fail. Reset stale stack and kasan unpoison in bringup_cpu Release trampoline_lock a bit earlier. v16: Roll back to CPUHP_OFFLINE on failure in parallel bringup case. Release trampoline_lock earlier, just before setup_gdt. Rebase to x86/apic (Linux 6.3-rc3). v17: Change number of states for parallel bringup to one. David Woodhouse (8): cpu/hotplug: Move idle_thread_get() to cpu/hotplug: Reset task stack state in _cpu_up() cpu/hotplug: Add CPUHP_BP_PARALLEL_STARTUP state before CPUHP_BRINGUP_CPU 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 x86/smpboot: Allow parallel bringup for SEV-ES .../admin-guide/kernel-parameters.txt | 3 + arch/x86/coco/core.c | 5 + arch/x86/include/asm/coco.h | 1 + arch/x86/include/asm/cpu.h | 1 + arch/x86/include/asm/realmode.h | 3 + arch/x86/include/asm/sev-common.h | 3 + arch/x86/include/asm/smp.h | 13 +- arch/x86/include/asm/topology.h | 2 - arch/x86/kernel/acpi/sleep.c | 9 +- arch/x86/kernel/apic/apic.c | 2 +- arch/x86/kernel/cpu/common.c | 6 +- arch/x86/kernel/cpu/topology.c | 3 +- arch/x86/kernel/head_64.S | 97 +++++ arch/x86/kernel/smpboot.c | 345 +++++++++++++----- arch/x86/realmode/init.c | 3 + arch/x86/realmode/rm/trampoline_64.S | 27 +- arch/x86/xen/smp_pv.c | 4 +- include/linux/cpuhotplug.h | 22 ++ include/linux/smpboot.h | 7 + kernel/cpu.c | 50 ++- kernel/smpboot.h | 2 - 21 files changed, 492 insertions(+), 116 deletions(-)