Messages in this thread Patch in this message | | | From | Atish Patra <> | Subject | [v1 06/10] RISC-V: KVM: No need to update the counter value during reset | Date | Mon, 18 Dec 2023 02:41:03 -0800 |
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The virtual counter value is updated during pmu_ctr_read. There is no need to update it in reset case. Otherwise, it will be counted twice which is incorrect.
Fixes: 0cb74b65d2e5 ("RISC-V: KVM: Implement perf support without sampling") Signed-off-by: Atish Patra <atishp@rivosinc.com> --- arch/riscv/kvm/vcpu_pmu.c | 7 ++----- 1 file changed, 2 insertions(+), 5 deletions(-)
diff --git a/arch/riscv/kvm/vcpu_pmu.c b/arch/riscv/kvm/vcpu_pmu.c index 86391a5061dd..8c44f26e754d 100644 --- a/arch/riscv/kvm/vcpu_pmu.c +++ b/arch/riscv/kvm/vcpu_pmu.c @@ -432,12 +432,9 @@ int kvm_riscv_vcpu_pmu_ctr_stop(struct kvm_vcpu *vcpu, unsigned long ctr_base, sbiret = SBI_ERR_ALREADY_STOPPED; } - if (flags & SBI_PMU_STOP_FLAG_RESET) { - /* Relase the counter if this is a reset request */ - pmc->counter_val += perf_event_read_value(pmc->perf_event, - &enabled, &running); + if (flags & SBI_PMU_STOP_FLAG_RESET) + /* Release the counter if this is a reset request */ kvm_pmu_release_perf_event(pmc); - } } else { sbiret = SBI_ERR_INVALID_PARAM; } -- 2.34.1
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