linux-kernel - Re: [Patch v5 13/19] perf/x86: Enable SSP sampling using sample_regs

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Message-ID: <20251205122014.GX2528459@noisy.programming.kicks-ass.net>
Date: Fri, 5 Dec 2025 13:20:14 +0100
From: Peter Zijlstra <peterz@...radead.org>
To: Dapeng Mi <dapeng1.mi@...ux.intel.com>
Cc: Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Ian Rogers <irogers@...gle.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Andi Kleen <ak@...ux.intel.com>,
	Eranian Stephane <eranian@...gle.com>,
	Mark Rutland <mark.rutland@....com>, broonie@...nel.org,
	Ravi Bangoria <ravi.bangoria@....com>, linux-kernel@...r.kernel.org,
	linux-perf-users@...r.kernel.org, Zide Chen <zide.chen@...el.com>,
	Falcon Thomas <thomas.falcon@...el.com>,
	Dapeng Mi <dapeng1.mi@...el.com>, Xudong Hao <xudong.hao@...el.com>,
	Kan Liang <kan.liang@...ux.intel.com>
Subject: Re: [Patch v5 13/19] perf/x86: Enable SSP sampling using
 sample_regs_* fields

On Wed, Dec 03, 2025 at 02:54:54PM +0800, Dapeng Mi wrote:
> diff --git a/arch/x86/include/asm/perf_event.h b/arch/x86/include/asm/perf_event.h
> index ca242db3720f..c925af4160ad 100644
> --- a/arch/x86/include/asm/perf_event.h
> +++ b/arch/x86/include/asm/perf_event.h
> @@ -729,6 +729,10 @@ struct x86_perf_regs {
>  		u64	*egpr_regs;
>  		struct apx_state *egpr;
>  	};
> +	union {
> +		u64	*cet_regs;
> +		struct cet_user_state *cet;
> +	};
>  };

Are we envisioning more than just SSP?