From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.15]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 44D81126C05; Tue, 22 Oct 2024 23:45:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.15 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729640748; cv=none; b=CY8tZGbVjTQM6B6ocsMqNYTdvp/RkEvT0Un7Y49nyDav8waiKCfRxVuJU6loiw5JT0UwMC9qvqz3J5xsw6KrQe5wvt0hQNktQUbUj+Kr0KfL/mj2LBwgGBYP8MxrYADTxAds2mmbDSPBX6hGcSR31lX8UxYcauJrydPBFy3IORQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729640748; c=relaxed/simple; bh=pDIp6PIXI7LCutYgWUWmchS4MNpPa0JMX6sCG63Zp3k=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=N2UF/uumpEpk3S0fAuuNJQjBWXXPy9p6+Tg19TnKDdYerxGcz62VYqsg7tBaZuyGO4rtj34mulEnxPtaRYxs0HmnjYQWnWxAlcqmASVwNvHwHpEaMaUujTHJ9MCC1SvQmcvTukSE8ONcEL2fkPGFVHfh0bPsvRT9xZU/2HD3V8c= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com; spf=none smtp.mailfrom=linux.intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=HrBPXvL9; arc=none smtp.client-ip=192.198.163.15 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="HrBPXvL9" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1729640747; x=1761176747; h=date:from:to:cc:subject:message-id:references: mime-version:in-reply-to; bh=pDIp6PIXI7LCutYgWUWmchS4MNpPa0JMX6sCG63Zp3k=; b=HrBPXvL91RrlDuB3vYw2Dz2a2asOca1G8EX9Vr4TxoAb+NeWrp66rn/B b5RKA3BjTYK1nYm7ajNJHnpv+OOc7dr+EbK+NuxP3OZVThTeJxnnbhMax SwAHZGhgH6VFJ0J/zn/AnBHDdRc34ToOqUZIljuIHvWhj7ZEoAXDfJtk4 1yiyC5/vojbHEyQdCIfPZou0s/xTxJplcS7kI5fA3+m5mtXWD5ICafF8x dF3RgaNrEow7fpG5PugJmjcvxZwlj/ZzuK1henSshQbF+rP+JGJup8MJh Xh8u5gbyz1yxSnjWstf6kPuUAX7zh8v3fIzXwTnXs5vi+jHP7GSn5WzVr Q==; X-CSE-ConnectionGUID: WWGtQBIdTTmJQuphj3zp4A== X-CSE-MsgGUID: 1NTfbLFBToGqrfCUdVuNIQ== X-IronPort-AV: E=McAfee;i="6700,10204,11233"; a="29316930" X-IronPort-AV: E=Sophos;i="6.11,223,1725346800"; d="scan'208";a="29316930" 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> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: > > 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