linux-kernel - Re: [PATCH V13 03/14] KVM: x86: Fix Intel PT Host/Guest mode when host tracing also

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Message-ID: <Zxg5KJKx-mdY4ocC@tassilo>
Date: Tue, 22 Oct 2024 16:45:44 -0700
From: Andi Kleen <ak@...ux.intel.com>
To: Sean Christopherson <seanjc@...gle.com>
Cc: Adrian Hunter <adrian.hunter@...el.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Paolo Bonzini <pbonzini@...hat.com>, Ingo Molnar <mingo@...hat.com>,
	Mark Rutland <mark.rutland@....com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Heiko Carstens <hca@...ux.ibm.com>,
	Thomas Richter <tmricht@...ux.ibm.com>,
	Hendrik Brueckner <brueckner@...ux.ibm.com>,
	Suzuki K Poulose <suzuki.poulose@....com>,
	Mike Leach <mike.leach@...aro.org>,
	James Clark <james.clark@....com>, coresight@...ts.linaro.org,
	linux-arm-kernel@...ts.infradead.org,
	Yicong Yang <yangyicong@...ilicon.com>,
	Jonathan Cameron <jonathan.cameron@...wei.com>,
	Will Deacon <will@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Jiri Olsa <jolsa@...nel.org>, Namhyung Kim <namhyung@...nel.org>,
	Ian Rogers <irogers@...gle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
	H Peter Anvin <hpa@...or.com>,
	Kan Liang <kan.liang@...ux.intel.com>,
	Zhenyu Wang <zhenyuw@...ux.intel.com>, mizhang@...gle.com,
	kvm@...r.kernel.org, Shuah Khan <shuah@...nel.org>,
	linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-perf-users@...r.kernel.org
Subject: Re: [PATCH V13 03/14] KVM: x86: Fix Intel PT Host/Guest mode when
 host tracing also

> 
> 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