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Date: Wed, 1 Nov 2017 15:09:02 +0100 (CET)
From: Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [PATCH 00/23] KAISER: unmap most of the kernel from userspace
 page tables
In-Reply-To: <20171101085424.cwvc4nrrdhvjc3su@gmail.com>
Message-ID: <alpine.DEB.2.20.1711011506190.1942@nanos>
References: <20171031223146.6B47C861@viggo.jf.intel.com> <20171101085424.cwvc4nrrdhvjc3su@gmail.com>
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To: Ingo Molnar <mingo@kernel.org>
Cc: Dave Hansen <dave.hansen@linux.intel.com>, LKML <linux-kernel@vger.kernel.org>, linux-mm@kvack.org, Andy Lutomirski <luto@kernel.org>, Linus Torvalds <torvalds@linux-foundation.org>, Peter Zijlstra <a.p.zijlstra@chello.nl>, "H. Peter Anvin" <hpa@zytor.com>, borisBrian Gerst <brgerst@gmail.com>, Denys Vlasenko <dvlasenk@redhat.com>, Josh Poimboeuf <jpoimboe@redhat.com>, Thomas Garnier <thgarnie@google.com>

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

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