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=-10.3 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=ham 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 A12AFC433DF for ; Fri, 16 Oct 2020 07:24:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id F3F6B20878 for ; Fri, 16 Oct 2020 07:24:07 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="QJSTV0vm" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2404540AbgJPHYH (ORCPT ); Fri, 16 Oct 2020 03:24:07 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44658 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2404529AbgJPHYH (ORCPT ); Fri, 16 Oct 2020 03:24:07 -0400 Received: from mail-pf1-x444.google.com (mail-pf1-x444.google.com [IPv6:2607:f8b0:4864:20::444]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 14CF7C0613CF for ; Fri, 16 Oct 2020 00:24:07 -0700 (PDT) Received: by mail-pf1-x444.google.com with SMTP id 10so968225pfp.5 for ; Fri, 16 Oct 2020 00:24:06 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to:user-agent; bh=6rJmZWsTC3tZunlzMkeAL6DveINrC2rCniEtmBwJZXY=; b=QJSTV0vmxfvJQ+ezN1zSW/4ZDFdXSn2/+t4oCXg78Y1zZrCuNGLvyPvs9iYf5Qvx/i XMcFDmFUdD72lSwDB+vrYJlCQ1+m2nqMPTMJtWGnSmHs4kmyOqARDhMCz3LZ7kj0ceyH 61aR5GkEGi8OxyNjWNiGLyrooObfSzr4GflwEZfLibA1wtZSb/muQx7Ps6I50NdiDTzp aUCWio+mlTbSbDIZdjOTg7Qzf6N8CrYvhxJDkn34SvbIAO1CKnlDyCb8dHLwECrp0to7 Iibo76lGBXZyYe9WQMixuMZo6TqOAqA3+EOlzrPzrcCIEEPmhjUUUS2A9iHctYSmMD7o k6tQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to:user-agent; bh=6rJmZWsTC3tZunlzMkeAL6DveINrC2rCniEtmBwJZXY=; b=lOnp6bMCUqM3rhckTuaRBORL3GWbelcBBEnNVsuMqkUAzP6j/8U+YB/uke6O2wtssr iDY+pi3YPoMex5avKzBuU9K7WUrOo8zMXRWLXZBAwRP5p2hLbGwnesuSJm4OXOVJgwMf toMen3qHJlIW8qRBKfnnexsWi1/Rjuab6oZ/9wuNiGzz1jiBbdNyCRov2rM3DrwXkuCh T0h4A3popNIXJ8IB7M3pBOBEmGhuqOmW6KM9cel06WX1jrLXVUM5uMo7RWbddQjKviim IBWc6RwpBw8k6ZQXeIiNjliE4KBHdS1mqdNOEqt8dGmENiVTI8nZvhH0gdg8AlCRxIJ3 ep4g== X-Gm-Message-State: AOAM532xsApW1DhbdMBiJ/sWQwImF1iTNALMe7D4jb1Zeikqp+KQjjE5 fzaP33x/vOhUeSH2l7+MHQLq+w== X-Google-Smtp-Source: ABdhPJwUWPGICoFq9SFicWYImHXUPoyuhFpWAGUJwIWPJ+ED/XYFz6/H/JF/bR5CuhfixOWgV5UDqw== X-Received: by 2002:a62:37c4:0:b029:155:ebd8:304c with SMTP id e187-20020a6237c40000b0290155ebd8304cmr2585815pfa.73.1602833046302; Fri, 16 Oct 2020 00:24:06 -0700 (PDT) Received: from leoy-ThinkPad-X240s ([64.120.119.108]) by smtp.gmail.com with ESMTPSA id c15sm1586586pgg.77.2020.10.16.00.24.03 (version=TLS1_2 cipher=ECDHE-ECDSA-CHACHA20-POLY1305 bits=256/256); Fri, 16 Oct 2020 00:24:05 -0700 (PDT) Date: Fri, 16 Oct 2020 15:24:01 +0800 From: Leo Yan To: Denis Nikitin Cc: Mathieu Poirier , Sai Prakash Ranjan , linux-arm-msm@vger.kernel.org, coresight@lists.linaro.org, linux-kernel@vger.kernel.org, Stephen Boyd , linux-arm-kernel@lists.infradead.org, Mike Leach Subject: Re: [PATCH] coresight: etm4x: Add config to exclude kernel mode tracing Message-ID: <20201016072401.GC4646@leoy-ThinkPad-X240s> References: <20201015124522.1876-1-saiprakash.ranjan@codeaurora.org> <20201015160257.GA1450102@xps15> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.9.4 (2018-02-28) Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org On Thu, Oct 15, 2020 at 11:40:05PM -0700, Denis Nikitin wrote: > Hi Mathieu, > > I think one of the use cases could be VMs. > Is there isolation between EL1 guest kernels which we can control from perf > in a system wide mode? Sorry for suddenly jumping in. For KVM, I think we need to implement mechanism for saving/restoring CoreSight context for every guest OS, the CPU PMUs has implemented related features [1]. Thanks, Leo [1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/arm64/kvm/pmu.c