KVM: x86/pmu: Move PMU reset logic to common x86 code

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Move the common (or at least "ignored") aspects of resetting the vPMU to
common x86 code, along with the stop/release helpers that are no used only
by the common pmu.c.

There is no need to manually handle fixed counters as all_valid_pmc_idx
tracks both fixed and general purpose counters, and resetting the vPMU is
far from a hot path, i.e. the extra bit of overhead to the PMC from the
index is a non-issue.

Zero fixed_ctr_ctrl in common code even though it's Intel specific.
Ensuring it's zero doesn't harm AMD/SVM in any way, and stopping the fixed
counters via all_valid_pmc_idx, but not clearing the associated control
bits, would be odd/confusing.

Make the .reset() hook optional as SVM no longer needs vendor specific
handling.

Cc: stable@vger.kernel.org
Reviewed-by: Dapeng Mi <dapeng1.mi@linux.intel.com>
Link: https://lore.kernel.org/r/20231103230541.352265-2-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

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This commit is contained in:

Sean Christopherson 2023-11-03 16:05:36 -07:00

parent e9e60c82fe

commit cbb359d81a

5 changed files with 40 additions and 56 deletions

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2

arch/x86/include/asm/kvm-x86-pmu-ops.h

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arch/x86/kvm/pmu.c

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arch/x86/kvm/pmu.h

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arch/x86/kvm/svm/pmu.c

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arch/x86/kvm/vmx/pmu_intel.c

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