When KVM retires a guest instruction through emulation, increment any vPMCs that are configured to monitor "instructions retired," and update the sample period of those counters so that they will overflow at the right time. Signed-off-by: Eric Hankland <ehankland@google.com> [jmattson: - Split the code to increment "branch instructions retired" into a separate commit. - Added 'static' to kvm_pmu_incr_counter() definition. - Modified kvm_pmu_incr_counter() to check pmc->perf_event->state == PERF_EVENT_STATE_ACTIVE. ] Fixes: f5132b01386b ("KVM: Expose a version 2 architectural PMU to a guests") Signed-off-by: Jim Mattson <jmattson@google.com> [likexu: - Drop checks for pmc->perf_event or event state or event type - Increase a counter once its umask bits and the first 8 select bits are matched - Rewrite kvm_pmu_incr_counter() with a less invasive approach to the host perf; - Rename kvm_pmu_record_event to kvm_pmu_trigger_event; - Add counter enable and CPL check for kvm_pmu_trigger_event(); ] Cc: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Like Xu <likexu@tencent.com> Message-Id: <20211130074221.93635-6-likexu@tencent.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Linux kernel ============ There are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. Please read Documentation/admin-guide/README.rst first. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. The formatted documentation can also be read online at: https://www.kernel.org/doc/html/latest/ There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.
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