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=-10.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 BBC9AC433DF for ; Fri, 16 Oct 2020 07:25:30 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (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 4137D2073A for ; Fri, 16 Oct 2020 07:25:30 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="ywRFTUlG"; dkim=fail reason="signature verification failed" (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="QJSTV0vm" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 4137D2073A Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linaro.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References:Message-ID: Subject:To:From:Date:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=07MlWeugtnXJ2ctcOs5NzpKw1l/OKJww9kBqs5bxnJE=; b=ywRFTUlG60/JjhmeIzMsOiwPE y2MdScDYM0uy8mJjnRWeIQjTDFY+TTq7DMnXT8IN6prT7WThXBY4uc+9GtEH0PjbR6kLpz5J82hcd 1uZkvvk8Z8tSbk+6FTnubhSGMx0wTSbMP84+p3WOtUoZoM+qNAAaAY76wJNAae3asCwMEI8ORMXUy X0WhzuBhquBVRuA40CP6syR7zd4g755XfqYep+ELpwT2Y7KcJreSYXtm/WisOEe1Nt5T/6cLmDTfI PeyPv6xkwOWDZBXKeUQsDlIOjwljyjPSmy3RltXV131DaPWKNxycBmlRp+hO/ypL63fxvUWF87gw0 wrXcUPA9w==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1kTK5z-0004u7-IE; Fri, 16 Oct 2020 07:24:11 +0000 Received: from mail-pf1-x443.google.com ([2607:f8b0:4864:20::443]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1kTK5w-0004tL-Fp for linux-arm-kernel@lists.infradead.org; Fri, 16 Oct 2020 07:24:09 +0000 Received: by mail-pf1-x443.google.com with SMTP id e10so982197pfj.1 for ; Fri, 16 Oct 2020 00:24:08 -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=DdWZ2aKIvUq8te2Lbbhf5tgunlrVj+/XHYAhP/v9DUGqpS1vXkv7c+HU7pa5DlGjtY dFSLjCQsVeJw0RRzzASfK2PYgxtd0ryonP7AksRdhuGbPLc7G3q7tjVKOHCu4Ch/vTLi BXiIR1/f2fE8aGiQohqX0dw5zgFhuOxo/sir/yK+F/L8+3wVuraFiyp0ylky4cqFWktY 2DJWPh626lRRdOW4+MQRkMTnHV9NZllN7ABrNa0gUlIxse3pZtt5j49xQP24b8Rcxzrs PEFv74wIcMURUWoqPPc/8kYOr2olA7Sj/yooNlW6vxKzku1rhihRqiULhSapV6xjTiIz IUlA== X-Gm-Message-State: AOAM533Jfth7WlPY4x+5LGgkm4fdq5ndB8paAEIzDqQO+Tpp3ozKR5Nj ZZwEgK8sUFc1nFBeR0Zv7mXfFA== 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 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-Disposition: inline In-Reply-To: User-Agent: Mutt/1.9.4 (2018-02-28) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201016_032408_621003_C81D2BC7 X-CRM114-Status: GOOD ( 12.47 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Sai Prakash Ranjan , Mathieu Poirier , 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 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.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 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel