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Date: Mon, 16 Apr 2018 09:13:22 -0700 From: Linus Torvalds <torvalds@...ux-foundation.org> To: Joerg Roedel <joro@...tes.org> Cc: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...nel.org>, "H . Peter Anvin" <hpa@...or.com>, "the arch/x86 maintainers" <x86@...nel.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, linux-mm <linux-mm@...ck.org>, Andy Lutomirski <luto@...nel.org>, Dave Hansen <dave.hansen@...el.com>, Josh Poimboeuf <jpoimboe@...hat.com>, Juergen Gross <jgross@...e.com>, Peter Zijlstra <peterz@...radead.org>, Borislav Petkov <bp@...en8.de>, Jiri Kosina <jkosina@...e.cz>, Boris Ostrovsky <boris.ostrovsky@...cle.com>, Brian Gerst <brgerst@...il.com>, David Laight <David.Laight@...lab.com>, Denys Vlasenko <dvlasenk@...hat.com>, Eduardo Valentin <eduval@...zon.com>, Greg KH <gregkh@...uxfoundation.org>, Will Deacon <will.deacon@....com>, "Liguori, Anthony" <aliguori@...zon.com>, Daniel Gruss <daniel.gruss@...k.tugraz.at>, Hugh Dickins <hughd@...gle.com>, Kees Cook <keescook@...gle.com>, Andrea Arcangeli <aarcange@...hat.com>, Waiman Long <llong@...hat.com>, Pavel Machek <pavel@....cz>, "David H . Gutteridge" <dhgutteridge@...patico.ca>, Joerg Roedel <jroedel@...e.de> Subject: Re: [PATCH 00/35 v5] PTI support for x32 On Mon, Apr 16, 2018 at 9:01 AM, Joerg Roedel <joro@...tes.org> wrote: > > Okay, I verify if there are any global bits left in the page-tables. > According to the PTDUMP_X86 the cpu_entry_area is mapped with G=1 (which > should be fine?) and another 4M range in the kernel mapping. I need to > check what that is. All the kernel entry code that is both in the user mapping and the kernel mapping should be marked G. We had missed a lot of it (and the impact is very small with PCID), but if you rebased on top of 4.17-rc1 you should have it fixed at least on 64-bit. See for example commit 8c06c7740d19 ("x86/pti: Leave kernel text global for !PCID") and in particular the performance numbers (that's an Atom microserver, but it was chosen due to lack of PCID). Linus
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