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

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Date:   Tue, 29 Oct 2019 15:46:12 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Luwei Kang <luwei.kang@...el.com>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        pbonzini@...hat.com, rkrcmar@...hat.com,
        sean.j.christopherson@...el.com, vkuznets@...hat.com,
        wanpengli@...cent.com, jmattson@...gle.com, joro@...tes.org,
        tglx@...utronix.de, mingo@...hat.com, bp@...en8.de, hpa@...or.com,
        x86@...nel.org, ak@...ux.intel.com, thomas.lendacky@....com,
        acme@...nel.org, mark.rutland@....com,
        alexander.shishkin@...ux.intel.com, jolsa@...hat.com,
        namhyung@...nel.org
Subject: Re: [PATCH v1 3/8] KVM: x86: Allocate performance counter for PEBS
 event

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?