linux-kernel - Re: [PATCH 04/24] x86/mm/kaiser: Unmap kernel mappings from userspace page tables, core patch

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Message-ID: <405c33ba-6177-b068-0150-7f474be215c3@linux.intel.com>
Date:   Mon, 27 Nov 2017 11:17:58 -0800
From:   Dave Hansen <dave.hansen@...ux.intel.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>
Cc:     linux-kernel@...r.kernel.org,
        Andy Lutomirski <luto@...capital.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        "H . Peter Anvin" <hpa@...or.com>, Borislav Petkov <bp@...en8.de>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH 04/24] x86/mm/kaiser: Unmap kernel mappings from userspace
 page tables, core patch

On 11/27/2017 07:39 AM, Peter Zijlstra wrote:
> So I had the problem that I could not tell if my shiny new kernel had
> this brand spanking awesome feature enabled or not.
> 
> Do we want something like so?

I eventually shoved one of these in the (buggy) runtime enable/disable
patch.  But, yeah, we do.