linux-kernel - Re: [Patch v4 03/17] x86/fpu/xstate: Add xsaves

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Message-ID: <3921d500-36ce-409c-8730-6be86a40e334@intel.com>
Date: Mon, 29 Sep 2025 12:01:47 -0700
From: Dave Hansen <dave.hansen@...el.com>
To: "Mi, Dapeng" <dapeng1.mi@...ux.intel.com>,
 Peter Zijlstra <peterz@...radead.org>, 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>,
 Kan Liang <kan.liang@...ux.intel.com>, Andi Kleen <ak@...ux.intel.com>,
 Eranian Stephane <eranian@...gle.com>
Cc: Mark Rutland <mark.rutland@....com>, broonie@...nel.org,
 Ravi Bangoria <ravi.bangoria@....com>, linux-kernel@...r.kernel.org,
 linux-perf-users@...r.kernel.org, Dapeng Mi <dapeng1.mi@...el.com>
Subject: Re: [Patch v4 03/17] x86/fpu/xstate: Add xsaves_nmi

On 9/27/25 22:31, Mi, Dapeng wrote:
>> Also, what supervisor components are involved here? Aren't we just
>> talking about [XYZ]MM's?
> Besides the SIMD registers [XYZ]MM, the CET_USR (only SSP) and APX eGPRs
> would be supported as well.

We should think long and hard about whether to use XSAVE for the CET
SSP. I'm not convinced it's worth it.