Re: [PATCH v4 07/16] KVM: x86/pmu: Add IA32_PEBS_ENABLE MSR emulation for extended PEBS

[Peter Zijlstra]

On Mon, Mar 29, 2021 at 01:41:28PM +0800, Like Xu wrote:
> +	if (vcpu->arch.perf_capabilities & PERF_CAP_PEBS_FORMAT) {
> +		if (vcpu->arch.perf_capabilities & PERF_CAP_PEBS_BASELINE) {
> +			pmu->pebs_enable_mask = ~pmu->global_ctrl;
> +			pmu->reserved_bits &= ~ICL_EVENTSEL_ADAPTIVE;
> +			for (i = 0; i < pmu->nr_arch_fixed_counters; i++)
> +				pmu->fixed_ctr_ctrl_mask &=
> +					~(1ULL << (INTEL_PMC_IDX_FIXED + i * 4));

{ }

> +		} else
> +			pmu->pebs_enable_mask = ~((1ull << pmu->nr_arch_gp_counters) - 1);

{ }

> +	} else {
> +		vcpu->arch.perf_capabilities &= ~PERF_CAP_PEBS_MASK;

as you already do here..

> +	}
>  }