Re: [PATCH] KVM: x86: vPMU: truncate counter value to allowed width

[Mingwei Zhang]

> diff --git a/arch/x86/kvm/pmu.c b/arch/x86/kvm/pmu.c
> index 48a0528080ab..8d28158e58f2 100644
> --- a/arch/x86/kvm/pmu.c
> +++ b/arch/x86/kvm/pmu.c
> @@ -322,7 +322,7 @@ static void reprogram_counter(struct kvm_pmc *pmc)
>         if (!pmc_event_is_allowed(pmc))
>                 goto reprogram_complete;
>
> -       if (pmc->counter < pmc->prev_counter)
> +       if (pmc->counter == 0)
>                 __kvm_perf_overflow(pmc, false);
>
>         if (eventsel & ARCH_PERFMON_EVENTSEL_PIN_CONTROL)
>
> Since this is software emulation, we (KVM) should only handle overflow
> by plusing one?

Sign. Please ignore this as it is not only hacky but also not working.