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Date: Sun, 26 Nov 2017 16:13:30 +0100 From: Ingo Molnar <mingo@...nel.org> To: Dave Hansen <dave.hansen@...ux.intel.com> Cc: Peter Zijlstra <peterz@...radead.org>, 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 25/43] x86/mm/kaiser: Unmap kernel from userspace page tables (core patch) * Dave Hansen <dave.hansen@...ux.intel.com> wrote: > On 11/24/2017 04:16 AM, Peter Zijlstra wrote: > > On Fri, Nov 24, 2017 at 10:14:30AM +0100, Ingo Molnar wrote: > >> +The minimalistic kernel portion of the user page tables try to > >> +map only what is needed to enter/exit the kernel such as the > >> +entry/exit functions themselves and the interrupt descriptor > >> +table (IDT). > > > > There are a few unnecessary things that get mapped > >> +such as the first C function when entering an interrupt (see > >> +comments in kaiser.c). > > > > If I understood Andy's patches correctly, this should no longer be > > required. Is this text still correct? > > It is out of date. We were able to remove the irq handler mappings. I have updated the Documentation/x86/kaiser.txt file accordingly. Thanks, Ingo
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