linux-kernel - Re: [RFC 1/7] x86/asm/64: Allocate and enable the SYSENTER stack

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Message-ID: <ea8f175e-359f-d4b3-cdd2-96650ce15715@intel.com>
Date:   Mon, 13 Nov 2017 11:07:33 -0800
From:   Dave Hansen <dave.hansen@...el.com>
To:     Andy Lutomirski <luto@...nel.org>, X86 ML <x86@...nel.org>
Cc:     Borislav Petkov <bpetkov@...e.de>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Brian Gerst <brgerst@...il.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [RFC 1/7] x86/asm/64: Allocate and enable the SYSENTER stack

On 11/10/2017 08:05 PM, Andy Lutomirski wrote:
> This will simplify some future code changes that will want some
> temporary stack space in more places.  It also lets us get rid of a
> SWAPGS_UNSAFE_STACK user.
> 
> This does not depend on CONFIG_IA32_EMULATION because we'll want the
> stack space even without IA32 emulation.

It was never clear to me why we don't use this on 64-bit today.  Does
anybody know why?