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 X-Spam-Level: X-Spam-Status: No, score=-2.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 81392C43331 for ; Wed, 13 Nov 2019 08:43:10 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id 52F91222CD for ; Wed, 13 Nov 2019 08:43:10 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 52F91222CD Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=intel.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:42192 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iUoF3-0001oB-Ae for qemu-devel@archiver.kernel.org; Wed, 13 Nov 2019 03:43:09 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:39071) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iUoET-0001N8-4s for qemu-devel@nongnu.org; Wed, 13 Nov 2019 03:42:34 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1iUoER-0000tE-9m for qemu-devel@nongnu.org; Wed, 13 Nov 2019 03:42:32 -0500 Received: from mga14.intel.com ([192.55.52.115]:56613) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1iUoER-0000ov-2T for qemu-devel@nongnu.org; Wed, 13 Nov 2019 03:42:31 -0500 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga006.jf.intel.com ([10.7.209.51]) by fmsmga103.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 13 Nov 2019 00:42:26 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.68,299,1569308400"; d="scan'208";a="207735222" Received: from txu2-mobl.ccr.corp.intel.com (HELO [10.239.196.231]) ([10.239.196.231]) by orsmga006.jf.intel.com with ESMTP; 13 Nov 2019 00:42:25 -0800 To: ehabkost@redhat.com From: Tao Xu Subject: About MONITOR/MWAIT in i386 CPU model Message-ID: Date: Wed, 13 Nov 2019 16:42:25 +0800 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.9.1 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 192.55.52.115 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "qemu-devel@nongnu.org" , "Guo, Xuelian" Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Hi Eduardo， After kvm use "-overcommit cpu-pm=on" to expose MONITOR/MWAIT (commit id 6f131f13e68d648a8e4f083c667ab1acd88ce4cd), the MONITOR/MWAIT feature in CPU model (phenom core2duo coreduo n270 Opteron_G3 EPYC Snowridge Denverton) may be unused. For example, when we boot a guest with Denverton cpu model, guest cannot detect MONITOR and boot with no warning. Should we remove this feature from some CPU model? Tested by Guo, Xuelian Tao Xu