From nobody Sat Nov 23 23:32:47 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=none dis=none) header.from=nongnu.org ARC-Seal: i=1; a=rsa-sha256; t=1728444050; cv=none; d=zohomail.com; s=zohoarc; b=gHyun/o9VTmIU1GA1V4TKxPq2a6Hq2exqFo02wtnhjhvRFxI90nFE6YDBAalbcPQpgxldoV56EV7xl0mHq1qJmETE0w3/aOBLn00uLWXj7MKixoMzxa3b54VHjRIw45V0+ovzuWcs5NRvOeuqwy35KLuZdtDbRzZGraZzbNQDJk= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1728444050; h=Content-Type:Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:Reply-To:Reply-To:References:Sender:Subject:Subject:To:To:Message-Id; bh=Hcg42jnB9P3vSvOXsSDX78o22Mw6gUD5ohZVkHuvWu4=; b=m67itHDW9DGKQsuMIbK8jnN7lq3fmlrOJI6YfDykWWoZfazlurikU6ooufOcP566mRBqYu++dEEeTEJ7w+3fMLn8zSO15An8bbgcoOVBiCRZ3pl3Z/ZONkHuLd/+TpxnPAmsClWF/6kYptMtjxd9vqxa7FrhQLZRWTy0SZfb4Sw= ARC-Authentication-Results: i=1; mx.zohomail.com; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass header.from= (p=none dis=none) Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1728444050597188.892842439932; Tue, 8 Oct 2024 20:20:50 -0700 (PDT) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1syNFO-0002qe-EE; Tue, 08 Oct 2024 23:20:22 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1syNFM-0002nx-LL; Tue, 08 Oct 2024 23:20:20 -0400 Received: from frasgout.his.huawei.com ([185.176.79.56]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1syNFK-0004UT-VE; Tue, 08 Oct 2024 23:20:20 -0400 Received: from mail.maildlp.com (unknown [172.18.186.31]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4XNdRh34k5z6K97j; Wed, 9 Oct 2024 11:20:00 +0800 (CST) Received: from frapeml500007.china.huawei.com (unknown [7.182.85.172]) by mail.maildlp.com (Postfix) with ESMTPS id 12BF5140133; Wed, 9 Oct 2024 11:20:17 +0800 (CST) Received: from 00293818-MRGF.huawei.com (10.126.173.89) by frapeml500007.china.huawei.com (7.182.85.172) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.1.2507.39; Wed, 9 Oct 2024 05:19:57 +0200 To: , , CC: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Subject: [PATCH RFC V4 02/33] cpu-common: Add common CPU utility for possible vCPUs Date: Wed, 9 Oct 2024 04:17:44 +0100 Message-ID: <20241009031815.250096-3-salil.mehta@huawei.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20241009031815.250096-1-salil.mehta@huawei.com> References: <20241009031815.250096-1-salil.mehta@huawei.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Originating-IP: [10.126.173.89] X-ClientProxiedBy: dggems705-chm.china.huawei.com (10.3.19.182) To frapeml500007.china.huawei.com (7.182.85.172) Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=185.176.79.56; envelope-from=salil.mehta@huawei.com; helo=frasgout.his.huawei.com X-Spam_score_int: -41 X-Spam_score: -4.2 X-Spam_bar: ---- X-Spam_report: (-4.2 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-to: Salil Mehta From: Salil Mehta via Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZM-MESSAGEID: 1728444052181116600 Content-Type: text/plain; charset="utf-8" This patch adds various utility functions that may be required to fetch or = check the state of possible vCPUs. It also introduces the concept of *disabled* v= CPUs, which are part of the *possible* vCPUs but are not enabled. This state will= be used during machine initialization and later during the plugging or unplugg= ing of vCPUs. We release the QOM CPU objects for all disabled vCPUs. Co-developed-by: Keqian Zhu Signed-off-by: Keqian Zhu Signed-off-by: Salil Mehta --- cpu-common.c | 21 ++++++++++++++++++++ include/hw/core/cpu.h | 46 +++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 67 insertions(+) diff --git a/cpu-common.c b/cpu-common.c index 6b262233a3..4a446f6f7f 100644 --- a/cpu-common.c +++ b/cpu-common.c @@ -24,6 +24,7 @@ #include "sysemu/cpus.h" #include "qemu/lockable.h" #include "trace/trace-root.h" +#include "hw/boards.h" =20 QemuMutex qemu_cpu_list_lock; static QemuCond exclusive_cond; @@ -108,6 +109,26 @@ void cpu_list_remove(CPUState *cpu) cpu_list_generation_id++; } =20 +CPUState *qemu_get_possible_cpu(int index) +{ + MachineState *ms =3D MACHINE(qdev_get_machine()); + const CPUArchIdList *possible_cpus =3D ms->possible_cpus; + + assert((index >=3D 0) && (index < possible_cpus->len)); + + return CPU(possible_cpus->cpus[index].cpu); +} + +bool qemu_present_cpu(CPUState *cpu) +{ + return cpu; +} + +bool qemu_enabled_cpu(CPUState *cpu) +{ + return cpu && !cpu->disabled; +} + CPUState *qemu_get_cpu(int index) { CPUState *cpu; diff --git a/include/hw/core/cpu.h b/include/hw/core/cpu.h index 1c9c775df6..73a4e4cce1 100644 --- a/include/hw/core/cpu.h +++ b/include/hw/core/cpu.h @@ -538,6 +538,20 @@ struct CPUState { CPUPluginState *plugin_state; #endif =20 + /* + * In the guest kernel, the presence of vCPUs is determined by informa= tion + * provided by the VMM or firmware via the ACPI MADT at boot time. Some + * architectures do not allow modifications to this configuration after + * the guest has booted. Therefore, for such architectures, hotpluggab= le + * vCPUs are exposed by the VMM as not 'ACPI Enabled' to the kernel. + * Within QEMU, such vCPUs (those that are 'yet-to-be-plugged' or have + * been hot-unplugged) may either have a `CPUState` object in a 'disab= led' + * state or may not have a `CPUState` object at all. + * + * By default, `CPUState` objects are enabled across all architectures. + */ + bool disabled; + /* TODO Move common fields from CPUArchState here. */ int cpu_index; int cluster_index; @@ -924,6 +938,38 @@ static inline bool cpu_in_exclusive_context(const CPUS= tate *cpu) */ CPUState *qemu_get_cpu(int index); =20 +/** + * qemu_get_possible_cpu: + * @index: The CPUState@cpu_index value of the CPU to obtain. + * Input index MUST be in range [0, Max Possible CPUs) + * + * If CPUState object exists,then it gets a CPU matching + * @index in the possible CPU array. + * + * Returns: The possible CPU or %NULL if CPU does not exist. + */ +CPUState *qemu_get_possible_cpu(int index); + +/** + * qemu_present_cpu: + * @cpu: The vCPU to check + * + * Checks if the vCPU is amongst the present possible vcpus. + * + * Returns: True if it is present possible vCPU else false + */ +bool qemu_present_cpu(CPUState *cpu); + +/** + * qemu_enabled_cpu: + * @cpu: The vCPU to check + * + * Checks if the vCPU is enabled. + * + * Returns: True if it is 'enabled' else false + */ +bool qemu_enabled_cpu(CPUState *cpu); + /** * cpu_exists: * @id: Guest-exposed CPU ID to lookup. --=20 2.34.1