| Message ID | 20250226-kvm_pmu_improve-v1-1-74c058c2bf6d@rivosinc.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | RISC-V KVM PMU fix and selftest improvement | expand |
On Wed, Feb 26, 2025 at 12:25:03PM -0800, Atish Patra wrote: > The perf event should be marked disabled during the creation as > it is not ready to be scheduled until there is SBI PMU start call > or config matching is called with auto start. Otherwise, event add/start > gets called during perf_event_create_kernel_counter function. > It will be enabled and scheduled to run via perf_event_enable during > either the above mentioned scenario. > > Fixes: 0cb74b65d2e5 ("RISC-V: KVM: Implement perf support without sampling") > > Signed-off-by: Atish Patra <atishp@rivosinc.com> > --- > arch/riscv/kvm/vcpu_pmu.c | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/arch/riscv/kvm/vcpu_pmu.c b/arch/riscv/kvm/vcpu_pmu.c > index 2707a51b082c..78ac3216a54d 100644 > --- a/arch/riscv/kvm/vcpu_pmu.c > +++ b/arch/riscv/kvm/vcpu_pmu.c > @@ -666,6 +666,7 @@ int kvm_riscv_vcpu_pmu_ctr_cfg_match(struct kvm_vcpu *vcpu, unsigned long ctr_ba > .type = etype, > .size = sizeof(struct perf_event_attr), > .pinned = true, > + .disabled = true, > /* > * It should never reach here if the platform doesn't support the sscofpmf > * extension as mode filtering won't work without it. > > -- > 2.43.0 > Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
diff --git a/arch/riscv/kvm/vcpu_pmu.c b/arch/riscv/kvm/vcpu_pmu.c index 2707a51b082c..78ac3216a54d 100644 --- a/arch/riscv/kvm/vcpu_pmu.c +++ b/arch/riscv/kvm/vcpu_pmu.c @@ -666,6 +666,7 @@ int kvm_riscv_vcpu_pmu_ctr_cfg_match(struct kvm_vcpu *vcpu, unsigned long ctr_ba .type = etype, .size = sizeof(struct perf_event_attr), .pinned = true, + .disabled = true, /* * It should never reach here if the platform doesn't support the sscofpmf * extension as mode filtering won't work without it.
The perf event should be marked disabled during the creation as it is not ready to be scheduled until there is SBI PMU start call or config matching is called with auto start. Otherwise, event add/start gets called during perf_event_create_kernel_counter function. It will be enabled and scheduled to run via perf_event_enable during either the above mentioned scenario. Fixes: 0cb74b65d2e5 ("RISC-V: KVM: Implement perf support without sampling") Signed-off-by: Atish Patra <atishp@rivosinc.com> --- arch/riscv/kvm/vcpu_pmu.c | 1 + 1 file changed, 1 insertion(+)