linux-kernel - Re: [PATCH V2 00/10] PKS: Add Protection Keys Supervisor (PKS) support

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Message-ID: <871rhb8h73.fsf@nanos.tec.linutronix.de>
Date:   Tue, 03 Nov 2020 00:36:16 +0100
From:   Thomas Gleixner <tglx@...utronix.de>
To:     ira.weiny@...el.com, Ingo Molnar <mingo@...hat.com>,
        Borislav Petkov <bp@...en8.de>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>
Cc:     Ira Weiny <ira.weiny@...el.com>, x86@...nel.org,
        Dan Williams <dan.j.williams@...el.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Fenghua Yu <fenghua.yu@...el.com>, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-nvdimm@...ts.01.org,
        linux-mm@...ck.org, linux-kselftest@...r.kernel.org
Subject: Re: [PATCH V2 00/10] PKS: Add Protection Keys Supervisor (PKS) support

On Mon, Nov 02 2020 at 12:53, ira weiny wrote:
> Fenghua Yu (2):
>   x86/pks: Enable Protection Keys Supervisor (PKS)
>   x86/pks: Add PKS kernel API
>
> Ira Weiny (7):
>   x86/pkeys: Create pkeys_common.h
>   x86/fpu: Refactor arch_set_user_pkey_access() for PKS support
>   x86/pks: Preserve the PKRS MSR on context switch
>   x86/entry: Pass irqentry_state_t by reference
>   x86/entry: Preserve PKRS MSR across exceptions
>   x86/fault: Report the PKRS state on fault
>   x86/pks: Add PKS test code
>
> Thomas Gleixner (1):
>   x86/entry: Move nmi entry/exit into common code

So the actual patch ordering is:

   x86/pkeys: Create pkeys_common.h
   x86/fpu: Refactor arch_set_user_pkey_access() for PKS support
   x86/pks: Enable Protection Keys Supervisor (PKS)
   x86/pks: Preserve the PKRS MSR on context switch
   x86/pks: Add PKS kernel API

   x86/entry: Move nmi entry/exit into common code
   x86/entry: Pass irqentry_state_t by reference

   x86/entry: Preserve PKRS MSR across exceptions
   x86/fault: Report the PKRS state on fault
   x86/pks: Add PKS test code

This is the wrong ordering, really.

     x86/entry: Move nmi entry/exit into common code

is a general cleanup and has absolutely nothing to do with PKRS.So this
wants to go first.

Also:

    x86/entry: Move nmi entry/exit into common code

is a prerequisite for the rest. So why is it in the middle of the
series?

And then you enable all that muck _before_ it is usable:

   Patch 3/N: x86/pks: Enable Protection Keys Supervisor (PKS)

Bisectability is overrrated, right?

Once again: Read an understand Documentation/process/*

Aside of that using a spell checker is not optional.

Thanks,

        tglx