From mboxrd@z Thu Jan 1 00:00:00 1970 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 lists.gnu.org (lists.gnu.org [209.51.188.17]) (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 B8988C433EF for ; Fri, 20 May 2022 07:27:33 +0000 (UTC) Received: from localhost ([::1]:47390 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1nrx2q-0002sJ-Pl for qemu-devel@archiver.kernel.org; Fri, 20 May 2022 03:27:32 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:57728) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nrwna-0001hh-Nt for qemu-devel@nongnu.org; Fri, 20 May 2022 03:11:46 -0400 Received: from mga05.intel.com ([192.55.52.43]:8077) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nrwnY-0002pv-CH for qemu-devel@nongnu.org; Fri, 20 May 2022 03:11:46 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1653030704; x=1684566704; h=from:to:cc:subject:date:message-id; bh=uf7bQKdvNgjIJ75NdNzkRfUPgeKm6dafbA5aTQIT7TA=; b=K5Pks6gxoQlWLTjuj0OZiYRZ5XK6uXTVBRV3d2Na+1QT6P0zAyyNkrkv PMQm9onMd7ISCValCmLIlxFFwxAL2bs76ZFRQbfWnConj7fqZ5TXr24Q9 6vEZef0FSFX4cL0sX0Gr7dob9WhCQn+u4L/CBJ7zkIWMFv/SY/xy80Pt8 bvJy6PP12aC1ab3np8OjH6osgj7yOvOtSJi8PnjhIrbQnELfx+s1nyQut GrJd6aCcBQRHKwtRQX3fNKh/BcDpMGFGaST/os7+wKUf8c/rf0q5IyFFd ey/976ef4YKUDFSy8oPLlV6Urf8sjWl18ZUccPzKroO1SOOh+QmpZdOBe Q==; X-IronPort-AV: E=McAfee;i="6400,9594,10352"; a="358923642" X-IronPort-AV: E=Sophos;i="5.91,238,1647327600"; d="scan'208";a="358923642" Received: from orsmga008.jf.intel.com ([10.7.209.65]) by fmsmga105.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 20 May 2022 00:11:35 -0700 X-IronPort-AV: E=Sophos;i="5.91,238,1647327600"; d="scan'208";a="599062888" Received: from arthur-vostro-3668.sh.intel.com ([10.239.13.120]) by orsmga008-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 20 May 2022 00:11:32 -0700 From: Zeng Guang To: Paolo Bonzini , Sean Christopherson , "Michael S . Tsirkin" , Marcel Apfelbaum , Richard Henderson , Eduardo Habkost Cc: qemu-devel@nongnu.org, kvm@vger.kernel.org, Gao Chao , Zeng Guang Subject: [QEMU PATCH] x86: Set maximum APIC ID to KVM prior to vCPU creation Date: Fri, 20 May 2022 14:39:28 +0800 Message-Id: <20220520063928.23645-1-guang.zeng@intel.com> X-Mailer: git-send-email 2.17.1 Received-SPF: pass client-ip=192.55.52.43; envelope-from=guang.zeng@intel.com; helo=mga05.intel.com X-Spam_score_int: -44 X-Spam_score: -4.5 X-Spam_bar: ---- X-Spam_report: (-4.5 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.082, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 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: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Specify maximum possible APIC ID assigned for current VM session prior to the creation of vCPUs. KVM need set up VM-scoped data structure indexed by the APIC ID, e.g. Posted-Interrupt Descriptor table to support Intel IPI virtualization. It can be achieved by calling KVM_ENABLE_CAP for KVM_CAP_MAX_VCPU_ID capability once KVM has already enabled it. Otherwise, simply prompts that KVM doesn't support this capability yet. Signed-off-by: Zeng Guang --- hw/i386/x86.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/hw/i386/x86.c b/hw/i386/x86.c index 4cf107baea..ff74492325 100644 --- a/hw/i386/x86.c +++ b/hw/i386/x86.c @@ -106,7 +106,7 @@ out: void x86_cpus_init(X86MachineState *x86ms, int default_cpu_version) { - int i; + int i, ret; const CPUArchIdList *possible_cpus; MachineState *ms = MACHINE(x86ms); MachineClass *mc = MACHINE_GET_CLASS(x86ms); @@ -123,6 +123,13 @@ void x86_cpus_init(X86MachineState *x86ms, int default_cpu_version) */ x86ms->apic_id_limit = x86_cpu_apic_id_from_index(x86ms, ms->smp.max_cpus - 1) + 1; + + ret = kvm_vm_enable_cap(kvm_state, KVM_CAP_MAX_VCPU_ID, + 0, x86ms->apic_id_limit); + if (ret < 0) { + error_report("kvm: Set max vcpu id not supported: %s", strerror(-ret)); + } + possible_cpus = mc->possible_cpu_arch_ids(ms); for (i = 0; i < ms->smp.cpus; i++) { x86_cpu_new(x86ms, possible_cpus->cpus[i].arch_id, &error_fatal); -- 2.27.0