From patchwork Wed Aug 16 00:06:19 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lan Tianyu X-Patchwork-Id: 801914 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (mailfrom) smtp.mailfrom=nongnu.org (client-ip=2001:4830:134:3::11; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Received: from lists.gnu.org (lists.gnu.org [IPv6:2001:4830:134:3::11]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 3xXJxq1WXwz9s82 for ; Wed, 16 Aug 2017 16:15:59 +1000 (AEST) Received: from localhost ([::1]:53481 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dhrcS-0007AG-PN for incoming@patchwork.ozlabs.org; Wed, 16 Aug 2017 02:15:56 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:59940) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dhrc4-00078z-Fy for qemu-devel@nongnu.org; Wed, 16 Aug 2017 02:15:33 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1dhrbz-0000Nx-M7 for qemu-devel@nongnu.org; Wed, 16 Aug 2017 02:15:32 -0400 Received: from mga01.intel.com ([192.55.52.88]:38744) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1dhrbz-0000Lt-Do for qemu-devel@nongnu.org; Wed, 16 Aug 2017 02:15:27 -0400 Received: from orsmga004.jf.intel.com ([10.7.209.38]) by fmsmga101.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 15 Aug 2017 23:15:26 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.41,381,1498546800"; d="scan'208";a="119497200" Received: from sky-ws.sh.intel.com (HELO localhost) ([10.239.48.141]) by orsmga004.jf.intel.com with ESMTP; 15 Aug 2017 23:15:24 -0700 From: Lan Tianyu To: qemu-devel@nongnu.org Date: Tue, 15 Aug 2017 20:06:19 -0400 Message-Id: <1502841979-6233-2-git-send-email-tianyu.lan@intel.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1502841979-6233-1-git-send-email-tianyu.lan@intel.com> References: <1502841979-6233-1-git-send-email-tianyu.lan@intel.com> X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 192.55.52.88 Subject: [Qemu-devel] [PATCH v3 2/2] x86: Increase max vcpu number to 8192 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Lan Tianyu , ehabkost@redhat.com, mst@redhat.com, rkrcmar@redhat.com, pbonzini@redhat.com, rth@twiddle.net Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" For HPC usage case, it will create a huge VM with vcpus number as same as host cpus and this requires more vcpus support in a single VM. This patch is to increase max vcpu number from 288 to 8192 which is current default maximum cpu number for Linux kernel. Signed-off-by: Lan Tianyu --- hw/i386/pc_q35.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/hw/i386/pc_q35.c b/hw/i386/pc_q35.c index b469d05..3468f5a 100644 --- a/hw/i386/pc_q35.c +++ b/hw/i386/pc_q35.c @@ -299,7 +299,7 @@ static void pc_q35_machine_options(MachineClass *m) m->default_display = "std"; m->no_floppy = 1; m->has_dynamic_sysbus = true; - m->max_cpus = 288; + m->max_cpus = 8192; } static void pc_q35_2_11_machine_options(MachineClass *m) @@ -314,6 +314,7 @@ static void pc_q35_2_10_machine_options(MachineClass *m) { pc_q35_2_11_machine_options(m); m->alias = NULL; + m->max_cpus = 288; m->numa_auto_assign_ram = numa_legacy_auto_assign_ram; SET_MACHINE_COMPAT(m, PC_COMPAT_2_10); }