linux-kernel - Re: [PATCH 00/23] KAISER: unmap most of the kernel from userspace page tables

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Message-ID: <alpine.DEB.2.20.1711011506190.1942@nanos>
Date:   Wed, 1 Nov 2017 15:09:02 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Ingo Molnar <mingo@...nel.org>
cc:     Dave Hansen <dave.hansen@...ux.intel.com>,
        LKML <linux-kernel@...r.kernel.org>, linux-mm@...ck.org,
        Andy Lutomirski <luto@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        "H. Peter Anvin" <hpa@...or.com>,
        borisBrian Gerst <brgerst@...il.com>,
        Denys Vlasenko <dvlasenk@...hat.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Thomas Garnier <thgarnie@...gle.com>
Subject: Re: [PATCH 00/23] KAISER: unmap most of the kernel from userspace
 page tables

On Wed, 1 Nov 2017, Ingo Molnar wrote:
> Beyond the inevitable cavalcade of (solvable) problems that will pop up during 
> review, one major item I'd like to see addressed is runtime configurability: it 
> should be possible to switch between a CR3-flushing and a regular syscall and page 
> table model on the admin level, without restarting the kernel and apps. Distros 
> really, really don't want to double the number of kernel variants they have.

And this removes the !PARAVIRT dependency as well because when the kernel
detects xen_pv() then it simply disables kaiser and all works.

Thanks,

	tglx