Re: [PATCH v1 3/8] KVM: x86: Allocate performance counter for PEBS event

[Peter Zijlstra]

On Sun, Oct 27, 2019 at 07:11:12PM -0400, Luwei Kang wrote:
 @@ -99,7 +99,7 @@ static void kvm_perf_overflow_intr(struct perf_event *perf_event,
>  static void pmc_reprogram_counter(struct kvm_pmc *pmc, u32 type,
>  				  unsigned config, bool exclude_user,
>  				  bool exclude_kernel, bool intr,
> -				  bool in_tx, bool in_tx_cp)
> +				  bool in_tx, bool in_tx_cp, bool pebs)
>  {
>  	struct perf_event *event;
>  	struct perf_event_attr attr = {
> @@ -111,9 +111,12 @@ static void pmc_reprogram_counter(struct kvm_pmc *pmc, u32 type,
>  		.exclude_user = exclude_user,
>  		.exclude_kernel = exclude_kernel,
>  		.config = config,
> +		.precise_ip = pebs ? 1 : 0,
> +		.aux_output = pebs ? 1 : 0,

srsly?