linux-kernel - Re: [patch V2 15/16] x86/iopl: Remove legacy IOPL option

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Date:   Tue, 12 Nov 2019 20:40:52 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Andy Lutomirski <luto@...nel.org>
cc:     LKML <linux-kernel@...r.kernel.org>, X86 ML <x86@...nel.org>,
        Linus Torvalds <torvalds@...uxfoundation.org>,
        Stephen Hemminger <stephen@...workplumber.org>,
        Willy Tarreau <w@....eu>, Juergen Gross <jgross@...e.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        "H. Peter Anvin" <hpa@...or.com>
Subject: Re: [patch V2 15/16] x86/iopl: Remove legacy IOPL option

On Tue, 12 Nov 2019, Andy Lutomirski wrote:
> On Mon, Nov 11, 2019 at 2:35 PM Thomas Gleixner <tglx@...utronix.de> wrote:
> >
> > From: Thomas Gleixner <tglx@...utronix.de>
> >
> > The IOPL emulation via the I/O bitmap is sufficient. Remove the legacy
> > cruft dealing with the (e)flags based IOPL mechanism.
> 
> Acked-by: Andy Lutomirski <luto@...nel.org>
> 
> But I think you could simplify a little bit and have a single config
> option that controls the iopl() and iopl() syscalls.

You mean turning off both iopl() and ioperm() in one go. Yes, that'd be
possible. Let me look.

Thanks,

	tglx