linux-kernel - Re: [patch V2 03/52] x86/pkeys: Revert a5eff7259790 ("x86/pkeys: Add PKRU value to init

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Date:   Tue, 15 Jun 2021 15:15:16 +0200
From:   Borislav Petkov <bp@...e.de>
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>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Tony Luck <tony.luck@...el.com>,
        Yu-cheng Yu <yu-cheng.yu@...el.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Kan Liang <kan.liang@...ux.intel.com>
Subject: Re: [patch V2 03/52] x86/pkeys: Revert a5eff7259790 ("x86/pkeys: Add
 PKRU value to init_fpstate")

On Mon, Jun 14, 2021 at 05:44:11PM +0200, Thomas Gleixner wrote:
> This cannot work and it's unclear how that ever made a difference.
> 
> init_fpstate.xsave.header.xfeatures is always 0 so get_xsave_addr() will
> always return a NULL pointer, which will prevent storing the default PKRU
> value in initfp_state.
> 
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> ---
> V2: Fix subject
> ---
>  arch/x86/kernel/cpu/common.c |    5 -----
>  arch/x86/mm/pkeys.c          |    6 ------
>  2 files changed, 11 deletions(-)

Reviewed-by: Borislav Petkov <bp@...e.de>

-- 
Regards/Gruss,
    Boris.

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