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=-5.3 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A,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 7749AC433B4 for ; Tue, 6 Apr 2021 03:24:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 42E446124B for ; Tue, 6 Apr 2021 03:24:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242302AbhDFDZA (ORCPT ); Mon, 5 Apr 2021 23:25:00 -0400 Received: from szxga02-in.huawei.com ([45.249.212.188]:3513 "EHLO szxga02-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230364AbhDFDYy (ORCPT ); Mon, 5 Apr 2021 23:24:54 -0400 Received: from DGGEML402-HUB.china.huawei.com (unknown [172.30.72.55]) by szxga02-in.huawei.com (SkyGuard) with ESMTP id 4FDtBZ2RN9zRYx1; Tue, 6 Apr 2021 11:22:46 +0800 (CST) Received: from dggpeml500013.china.huawei.com (7.185.36.41) by DGGEML402-HUB.china.huawei.com (10.3.17.38) with Microsoft SMTP Server (TLS) id 14.3.498.0; Tue, 6 Apr 2021 11:24:45 +0800 Received: from [10.174.187.161] (10.174.187.161) by dggpeml500013.china.huawei.com (7.185.36.41) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256) id 15.1.2106.2; Tue, 6 Apr 2021 11:24:45 +0800 To: References: <20210329054137.120994-2-like.xu@linux.intel.com> Subject: Re: [PATCH v4 01/16] perf/x86/intel: Add x86_pmu.pebs_vmx for Ice Lake Servers CC: , "Fangyi (Eric)" , Xiexiangyou , , , , , From: "Liuxiangdong (Aven, Cloud Infrastructure Service Product Dept.)" Message-ID: <606BD46F.7050903@huawei.com> Date: Tue, 6 Apr 2021 11:24:31 +0800 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:38.0) Gecko/20100101 Thunderbird/38.1.0 MIME-Version: 1.0 In-Reply-To: <20210329054137.120994-2-like.xu@linux.intel.com> Content-Type: text/plain; charset="utf-8"; format=flowed Content-Transfer-Encoding: 8bit X-Originating-IP: [10.174.187.161] X-ClientProxiedBy: dggeme704-chm.china.huawei.com (10.1.199.100) To dggpeml500013.china.huawei.com (7.185.36.41) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Hi，like. Some questions about this new pebs patches set： https://lore.kernel.org/kvm/20210329054137.120994-2-like.xu@linux.intel.com/ The new hardware facility supporting guest PEBS is only available on Intel Ice Lake Server platforms for now. AFAIK， Icelake supports adaptive PEBS and extended PEBS which Skylake doesn't. But we can still use IA32_PEBS_ENABLE MSR to indicate general-purpose counter in Skylake. Is there anything else that only Icelake supports in this patches set? Besides, we have tried this patches set in Icelake. We can use pebs(eg: "perf record -e cycles:pp") when guest is kernel-5.11, but can't when kernel-4.18. Is there a minimum guest kernel version requirement? Thanks, Xiangdong Liu