linux-kernel - Re: [RFC PATCH 06/12] perf: Support extension of sample

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <7f4be5d6-7547-4e53-b35e-075763f10f67@linux.intel.com>
Date: Wed, 18 Jun 2025 11:24:48 -0400
From: "Liang, Kan" <kan.liang@...ux.intel.com>
To: Dave Hansen <dave.hansen@...el.com>, Peter Zijlstra <peterz@...radead.org>
Cc: Mark Rutland <mark.rutland@....com>,
 "Mi, Dapeng" <dapeng1.mi@...ux.intel.com>, 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, ak@...ux.intel.com, zide.chen@...el.com,
 broonie@...nel.org
Subject: Re: [RFC PATCH 06/12] perf: Support extension of sample_regs



On 2025-06-18 10:47 a.m., Dave Hansen wrote:
> On 6/18/25 07:30, Dave Hansen wrote:
>> If software is going to munge the XSAVE format, then you don't have to
>> worry about alignment because you'd save it to some probably per-cpu
>> 64-byte-aligned buffer and then munge it into the unaligned
>> PERF_SAMPLE_SIMD_REGS above.
> 
> BTW, Peter just mentioned that you're just going to munge both the XSAVE
> and PEBS formats before letting userspace see them.

Right, there is no plan to export the XSAVE formats directly to the
userspace.

> Big ack from me on
> that, fwiw.

Thanks. :)

Kan