Re: [PATCH v3 1/7] KVM: x86/pmu: Avoid setting BIT_ULL(-1) to pmu->host_cross_mapped_mask

[Sean Christopherson <seanjc@xxxxxxxxxx>]

On Wed, Aug 31, 2022, Like Xu wrote:
> +		hw_idx = pmc->perf_event->hw.idx;
> +		/* make it a little less dependent on perf's exact behavior */

Reworded this to explain how a negative value can be encountered.

> +		if (hw_idx != pmc->idx && hw_idx > -1)
> +			pmu->host_cross_mapped_mask |= BIT_ULL(hw_idx);
>  	}
>  }