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Date: Tue, 5 Dec 2017 15:19:08 -0800 From: Andy Lutomirski <luto@...nel.org> To: Dave Hansen <dave.hansen@...el.com> Cc: Andy Lutomirski <luto@...nel.org>, Thomas Gleixner <tglx@...utronix.de>, LKML <linux-kernel@...r.kernel.org>, X86 ML <x86@...nel.org>, Linus Torvalds <torvalds@...ux-foundation.org>, Peter Zijlstra <peterz@...radead.org>, Borislav Petkov <bpetkov@...e.de>, Greg KH <gregkh@...uxfoundation.org>, Kees Cook <keescook@...gle.com>, Hugh Dickins <hughd@...gle.com>, Brian Gerst <brgerst@...il.com>, Josh Poimboeuf <jpoimboe@...hat.com>, Denys Vlasenko <dvlasenk@...hat.com>, Rik van Riel <riel@...hat.com>, Boris Ostrovsky <boris.ostrovsky@...cle.com>, Juergen Gross <jgross@...e.com>, David Laight <David.Laight@...lab.com>, Eduardo Valentin <eduval@...zon.com>, aliguori@...zon.com, Will Deacon <will.deacon@....com>, Daniel Gruss <daniel.gruss@...k.tugraz.at> Subject: Re: [patch 00/60] x86/kpti: Kernel Page Table Isolation (was KAISER) On Tue, Dec 5, 2017 at 1:57 PM, Dave Hansen <dave.hansen@...el.com> wrote: > On 12/05/2017 01:49 PM, Andy Lutomirski wrote: >> Random thought for the future: KPTI will make it possible to avoid >> global IPI broadcasts on kernel flushes as we discussed, incorrectly, >> two years ago at LPC. This could be nice. > > I'm slow. How? > By introducing an (optional) atomic check for need-to-flush on switches from user CR3 to kernel CR3.
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