linux-kernel - Re: [PATCH v3 4/5] KVM/x86/vPMU: Add APIs to support host save/restore the guest lbr stack

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Message-ID: <20180920121732.GR24124@hirez.programming.kicks-ass.net>
Date:   Thu, 20 Sep 2018 14:17:32 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Wei Wang <wei.w.wang@...el.com>
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        pbonzini@...hat.com, ak@...ux.intel.com, kan.liang@...el.com,
        mingo@...hat.com, rkrcmar@...hat.com, like.xu@...el.com,
        jannh@...gle.com, arei.gonglei@...wei.com
Subject: Re: [PATCH v3 4/5] KVM/x86/vPMU: Add APIs to support host
 save/restore the guest lbr stack

On Thu, Sep 20, 2018 at 06:05:58PM +0800, Wei Wang wrote:
> diff --git a/arch/x86/events/perf_event.h b/arch/x86/events/perf_event.h
> index 1562863..a91fdef 100644
> --- a/arch/x86/events/perf_event.h
> +++ b/arch/x86/events/perf_event.h
> @@ -223,6 +223,7 @@ struct cpu_hw_events {
>  	 */
>  	u64				intel_ctrl_guest_mask;
>  	u64				intel_ctrl_host_mask;
> +	bool				guest_lbr;
>  	struct perf_guest_switch_msr	guest_switch_msrs[X86_PMC_IDX_MAX];
>  
>  	/*

Please, no bools in aggregate types.

Either use a bitfield or u8, there's more LBR related bools, convert and
group the lot to avoid holes.