linux-kernel - Re: [PATCH v3 4/7] x86/fsgsbase/64: Factor out load FS/GS segments from __switch

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Date:   Mon, 18 Jun 2018 15:06:33 -0700
From:   Andy Lutomirski <luto@...nel.org>
To:     "Bae, Chang Seok" <chang.seok.bae@...el.com>
Cc:     Andrew Lutomirski <luto@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>,
        Andi Kleen <ak@...ux.intel.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "Metzger, Markus T" <markus.t.metzger@...el.com>,
        "Ravi V. Shankar" <ravi.v.shankar@...el.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 4/7] x86/fsgsbase/64: Factor out load FS/GS segments
 from __switch_to

On Thu, Jun 7, 2018 at 10:06 AM Chang S. Bae <chang.seok.bae@...el.com> wrote:
>
> Instead of open code, load_fsgs() will cleanup __switch_to
> and symmetric with FS/GS segment save. When FSGSBASE
> enabled, X86_FEATURE_FSGSBASE check will be incorporated.

The code is:

Reviewed-by: Andy Lutomirski <luto@...nel.org>

The changelog could be cleaned up a bit.  Maybe:

Instead of open coding the calls to load_seg_legacy(), add a
load_fsgs() helper to handle fs and gs.  When FSGSBASE is enabled,
load_fsgs() will be updated.