linux-kernel - [PATCH 0/3] KVM: x86: Fix Intel PT Host/Guest mode when host tracing also

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Message-ID: <20240906130026.10705-1-adrian.hunter@intel.com>
Date: Fri,  6 Sep 2024 16:00:23 +0300
From: Adrian Hunter <adrian.hunter@...el.com>
To: Sean Christopherson <seanjc@...gle.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>
Cc: Zhenyu Wang <zhenyuw@...ux.intel.com>,
	kvm@...r.kernel.org,
	Shuah Khan <shuah@...nel.org>,
	linux-kselftest@...r.kernel.org,
	Ingo Molnar <mingo@...hat.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>,
	Mark Rutland <mark.rutland@....com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Jiri Olsa <jolsa@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Ian Rogers <irogers@...gle.com>,
	Kan Liang <kan.liang@...ux.intel.com>,
	linux-kernel@...r.kernel.org,
	linux-perf-users@...r.kernel.org
Subject: [PATCH 0/3] KVM: x86: Fix Intel PT Host/Guest mode when host tracing also

Hi

There is a long-standing problem whereby running Intel PT on host and guest
in Host/Guest mode, causes VM-Entry failure.

The motivation for this patch set is to provide a fix for stable kernels
prior to the advent of the "Mediated Passthrough vPMU" patch set:

	https://lore.kernel.org/kvm/20240801045907.4010984-1-mizhang@google.com/

which would render a large part of the fix unnecessary but likely not be
suitable for backport to stable due to its size and complexity.

Ideally, this patch set would be applied before "Mediated Passthrough vPMU"

Note that the fix does not conflict with "Mediated Passthrough vPMU", it
is just that "Mediated Passthrough vPMU" will make the code to stop and
restart Intel PT unnecessary.


Adrian Hunter (3):
      KVM: x86: Fix Intel PT IA32_RTIT_CTL MSR validation
      KVM: x86: Fix Intel PT Host/Guest mode when host tracing also
      KVM: selftests: Add guest Intel PT test

 arch/x86/events/intel/pt.c                         | 131 ++++++-
 arch/x86/events/intel/pt.h                         |  10 +
 arch/x86/include/asm/intel_pt.h                    |   4 +
 arch/x86/kvm/vmx/vmx.c                             |  26 +-
 arch/x86/kvm/vmx/vmx.h                             |   1 -
 tools/testing/selftests/kvm/Makefile               |   1 +
 .../selftests/kvm/include/x86_64/processor.h       |   1 +
 tools/testing/selftests/kvm/x86_64/intel_pt.c      | 381 +++++++++++++++++++++
 8 files changed, 532 insertions(+), 23 deletions(-)
 create mode 100644 tools/testing/selftests/kvm/x86_64/intel_pt.c

base-commit: d45aab436cf06544abeeffc607110f559a3af3b4


Regards
Adrian