KVM: x86: Update vPMCs when retiring branch instructions

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When KVM retires a guest branch instruction through emulation,
increment any vPMCs that are configured to monitor "branch
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.
  - Moved/consolidated the calls to kvm_pmu_trigger_event() in the
    emulation of VMLAUNCH/VMRESUME to accommodate the evolution of
    that code.
]
Fixes: f5132b0138 ("KVM: Expose a version 2 architectural PMU to a guests")
Signed-off-by: Jim Mattson <jmattson@google.com>
Message-Id: <20211130074221.93635-7-likexu@tencent.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

...

This commit is contained in:

Eric Hankland 2021-11-30 15:42:21 +08:00 • committed by Paolo Bonzini

parent 9cd803d496

commit 018d70ffcf

4 changed files with 39 additions and 26 deletions

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55

arch/x86/kvm/emulate.c

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1

arch/x86/kvm/kvm_emulate.h

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7

arch/x86/kvm/vmx/nested.c

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2

arch/x86/kvm/x86.c

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