linux-kernel - Re: [RFC PATCH 08/12] perf/x86: Add APX in extended regs

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Message-ID: <20250617081904.GJ1613376@noisy.programming.kicks-ass.net>
Date: Tue, 17 Jun 2025 10:19:04 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: kan.liang@...ux.intel.com
Cc: mingo@...hat.com, acme@...nel.org, namhyung@...nel.org,
	tglx@...utronix.de, dave.hansen@...ux.intel.com, irogers@...gle.com,
	adrian.hunter@...el.com, jolsa@...nel.org,
	alexander.shishkin@...ux.intel.com, linux-kernel@...r.kernel.org,
	dapeng1.mi@...ux.intel.com, ak@...ux.intel.com, zide.chen@...el.com
Subject: Re: [RFC PATCH 08/12] perf/x86: Add APX in extended regs

On Fri, Jun 13, 2025 at 06:49:39AM -0700, kan.liang@...ux.intel.com wrote:
> From: Kan Liang <kan.liang@...ux.intel.com>
> 
> Support APX as the extended registers. It can be configured in the
> sample_ext_regs_intr/user.
> 
> Only the PMU with PERF_PMU_CAP_EXTENDED_REGS2 supports the feature.
> The value can be retrieved via the XSAVES.
> 
> Define several macros to simplify the code.
> 
> Signed-off-by: Kan Liang <kan.liang@...ux.intel.com>

Yuck.

How about reclaiming the current horrible XMM register space when the
new sample_simd_reg_words != 0 ?