linux-kernel - Re: [patch V3 00/66] x86/fpu: Spring cleaning and PKRU sanitizing

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Message-ID: <FF79EFCF-5D2C-4F3D-AF94-4BC2F7EED255@intel.com>
Date:   Thu, 24 Jun 2021 00:06:48 +0000
From:   "Bae, Chang Seok" <chang.seok.bae@...el.com>
To:     Thomas Gleixner <tglx@...utronix.de>
CC:     LKML <linux-kernel@...r.kernel.org>,
        Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "Yu, Fenghua" <fenghua.yu@...el.com>,
        "Luck, Tony" <tony.luck@...el.com>,
        "Yu, Yu-cheng" <yu-cheng.yu@...el.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Borislav Petkov <bp@...e.de>,
        Peter Zijlstra <peterz@...radead.org>,
        "Kan Liang" <kan.liang@...ux.intel.com>,
        "Brown, Len" <len.brown@...el.com>,
        "Shankar, Ravi V" <ravi.v.shankar@...el.com>
Subject: Re: [patch V3 00/66] x86/fpu: Spring cleaning and PKRU sanitizing

On Jun 22, 2021, at 13:02, Bae, Chang Seok <chang.seok.bae@...el.com> wrote:
> On Jun 21, 2021, at 15:22, Bae, Chang Seok <chang.seok.bae@...el.com> wrote:
>> I tried to apply AMX patches on top of this. The test looks to be okay by far.
>> I will also give an update here if I find anything.
> 
> This looks to be vague about the test. I took cases shown in AMX v5 like this:
> 	https://lore.kernel.org/lkml/20210523193259.26200-24-chang.seok.bae@intel.com/
> It validates AMX state with context switches, signal delivery/return, and
> context injection via ptrace.

Also, just for the record, as the next AMX version is imminent:

Lots of AMX-related code are mostly function name changes and I had to
readjust my assumption. (Maybe this is not conclusive yet as still digesting
the code.) But I think the rebase went well with the test results, and this
change improves the mainline in many ways that affect adjusting AMX code in
the right way.

Thanks,
Chang