diff options
author | Sean Christopherson <seanjc@google.com> | 2023-11-04 02:05:36 +0300 |
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committer | Sean Christopherson <seanjc@google.com> | 2023-11-30 23:52:54 +0300 |
commit | cbb359d81a2695bb5e63ec9de06fcbef28518891 (patch) | |
tree | bb62c8d182ef0b047648edeb48aea6279f1fe1b4 /arch/x86/kvm/pmu.h | |
parent | e9e60c82fe391d04db55a91c733df4a017c28b2f (diff) | |
download | linux-cbb359d81a2695bb5e63ec9de06fcbef28518891.tar.xz |
KVM: x86/pmu: Move PMU reset logic to common x86 code
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>
Diffstat (limited to 'arch/x86/kvm/pmu.h')
-rw-r--r-- | arch/x86/kvm/pmu.h | 18 |
1 files changed, 0 insertions, 18 deletions
diff --git a/arch/x86/kvm/pmu.h b/arch/x86/kvm/pmu.h index 1d64113de488..a46aa9b25150 100644 --- a/arch/x86/kvm/pmu.h +++ b/arch/x86/kvm/pmu.h @@ -80,24 +80,6 @@ static inline void pmc_write_counter(struct kvm_pmc *pmc, u64 val) pmc->counter &= pmc_bitmask(pmc); } -static inline void pmc_release_perf_event(struct kvm_pmc *pmc) -{ - if (pmc->perf_event) { - perf_event_release_kernel(pmc->perf_event); - pmc->perf_event = NULL; - pmc->current_config = 0; - pmc_to_pmu(pmc)->event_count--; - } -} - -static inline void pmc_stop_counter(struct kvm_pmc *pmc) -{ - if (pmc->perf_event) { - pmc->counter = pmc_read_counter(pmc); - pmc_release_perf_event(pmc); - } -} - static inline bool pmc_is_gp(struct kvm_pmc *pmc) { return pmc->type == KVM_PMC_GP; |