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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
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