linux-kernel - Re: [PATCH 03/39] x86/entry/32: Load task stack from x86

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Message-ID: <CALCETrVza8cpwKPzH1hXUSuassq117MZN7pJaBD89CA=FvuTsw@mail.gmail.com>
Date:   Tue, 17 Jul 2018 13:04:57 -0700
From:   Andy Lutomirski <luto@...nel.org>
To:     Joerg Roedel <jroedel@...e.de>
Cc:     Andy Lutomirski <luto@...nel.org>, Joerg Roedel <joro@...tes.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>,
        "H . Peter Anvin" <hpa@...or.com>, X86 ML <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux-MM <linux-mm@...ck.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Dave Hansen <dave.hansen@...el.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Juergen Gross <jgross@...e.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Borislav Petkov <bp@...en8.de>, Jiri Kosina <jkosina@...e.cz>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Brian Gerst <brgerst@...il.com>,
        David Laight <David.Laight@...lab.com>,
        Denys Vlasenko <dvlasenk@...hat.com>,
        Eduardo Valentin <eduval@...zon.com>,
        Greg KH <gregkh@...uxfoundation.org>,
        Will Deacon <will.deacon@....com>,
        "Liguori, Anthony" <aliguori@...zon.com>,
        Daniel Gruss <daniel.gruss@...k.tugraz.at>,
        Hugh Dickins <hughd@...gle.com>,
        Kees Cook <keescook@...gle.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Waiman Long <llong@...hat.com>, Pavel Machek <pavel@....cz>,
        "David H . Gutteridge" <dhgutteridge@...patico.ca>
Subject: Re: [PATCH 03/39] x86/entry/32: Load task stack from x86_tss.sp1 in
 SYSENTER handler

On Tue, Jul 17, 2018 at 12:05 AM, Joerg Roedel <jroedel@...e.de> wrote:
> On Fri, Jul 13, 2018 at 04:17:40PM -0700, Andy Lutomirski wrote:
>> I re-read it again.  How about keeping TSS_entry_stack but making it
>> be the offset from the TSS to the entry stack.  Then do the arithmetic
>> in asm.
>
> Hmm, I think its better to keep the arithmetic in the C file for better
> readability. How about renaming it to TSS_entry2task_stack?

That's okay with me.

>
>
> Regards,
>
>         Joerg