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 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 0C8D8D2C57C for ; Tue, 22 Oct 2024 23:47:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=gwkP65JJEiRC2ZsbFSMKIyGdWHQM2Kht6EptI5ybRQk=; b=IlECXcmFPd1soxLLDcgtdQDiff FN9ZplrIoSrPWjE/y8e0aFk2mFTKHZBWfXHBYBinwrCPrNV9QOEoQ9f2dWNqk5mFBOTlgTeGLoK8g ZDB41d5UMiOEqRYNLnu0GD+Q3MO3SNBmSwvL5jOAgON6xsDD3HZ78aD9GBdjo8ZuCu+5punEoh7k/ ahuiRv2fIpbiVxBcfO3CDgOuBvW2dv/hwQS6MEzmRc1x6HLLLgf2HR1/zwKOhJvsoGiV/aguuF7lF xKvg22t8xgU6N6wwcKUa8Cexv3OZpZbwleWovvk4hVO3VRDGon/efa/bxe7McPNj90NkO+cSdi+4I L3tYOpeA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1t3Oay-0000000CT6f-1e2j; Tue, 22 Oct 2024 23:47:24 +0000 Received: from mgamail.intel.com ([192.198.163.15]) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1t3OZR-0000000CSuM-315f for linux-arm-kernel@lists.infradead.org; Tue, 22 Oct 2024 23:45:50 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1729640750; x=1761176750; h=date:from:to:cc:subject:message-id:references: mime-version:in-reply-to; bh=pDIp6PIXI7LCutYgWUWmchS4MNpPa0JMX6sCG63Zp3k=; b=aZs95jS9HBNm6v5wP29lZrw8SIiaZ+mwV5x6sHf7s6FP8NQc7Rsz1OZp +/e9IJjbB5s/nxIYhFqrjNeFEB1NZinCciGykq2CUIidcJSFDR61q6rgX 2YcOTVa40MYtYrCbqdNAmxekNALVUlnBxSmXreHnt07qAhkiGWv7o6aV3 9HGw/7DGpIAgX7n4ahhij+a0e9Q2o+K/9fAUXzK507wxS8lgzIpUHBvGf PqQli20T4gW53gncNDEhVK+uhPkuSg0aLhLhgGsVUsWrnyDhlEZxe+FgX XKyM5e5dBksASHvZI4qOa1BBLEXhaFqLVRwFndHSDRtSIxA5dgrEQmLk9 Q==; X-CSE-ConnectionGUID: Qh143sCPQAiuwesubeo7VA== X-CSE-MsgGUID: LWnkJ7JDRT2HwQPqHCImbA== X-IronPort-AV: E=McAfee;i="6700,10204,11233"; a="29316935" X-IronPort-AV: E=Sophos;i="6.11,223,1725346800"; d="scan'208";a="29316935" Received: from fmviesa008.fm.intel.com ([10.60.135.148]) by fmvoesa109.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Oct 2024 16:45:46 -0700 X-CSE-ConnectionGUID: 55rXk8hyRsK1sIoI0f4Z6Q== X-CSE-MsgGUID: I305ftsyQn+MbR3owEo2xQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.11,223,1725346800"; d="scan'208";a="80096757" Received: from tassilo.jf.intel.com (HELO tassilo) ([10.54.38.190]) by fmviesa008-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Oct 2024 16:45:45 -0700 Date: Tue, 22 Oct 2024 16:45:44 -0700 From: Andi Kleen To: Sean Christopherson Cc: Adrian Hunter , Peter Zijlstra , Paolo Bonzini , Ingo Molnar , Mark Rutland , Alexander Shishkin , Heiko Carstens , Thomas Richter , Hendrik Brueckner , Suzuki K Poulose , Mike Leach , James Clark , coresight@lists.linaro.org, linux-arm-kernel@lists.infradead.org, Yicong Yang , Jonathan Cameron , Will Deacon , Arnaldo Carvalho de Melo , Jiri Olsa , Namhyung Kim , Ian Rogers , Thomas Gleixner , Borislav Petkov , Dave Hansen , x86@kernel.org, H Peter Anvin , Kan Liang , Zhenyu Wang , mizhang@google.com, kvm@vger.kernel.org, Shuah Khan , linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org Subject: Re: [PATCH V13 03/14] KVM: x86: Fix Intel PT Host/Guest mode when host tracing also Message-ID: References: <20241014105124.24473-1-adrian.hunter@intel.com> <20241014105124.24473-4-adrian.hunter@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20241022_164549_791910_37E4083B X-CRM114-Status: UNSURE ( 7.39 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org > > Out of curiosity, how much is Intel PT used purely for control flow tracing, i.e. > without caring _at all_ about perceived execution time? It is very common, e.g. one major use of PT is control flow discovery in feedback fuzzers. -Andi