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Date: Thu, 2 Nov 2017 09:36:37 -0700 From: Dave Hansen <dave.hansen@...ux.intel.com> To: Andy Lutomirski <luto@...nel.org> Cc: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "linux-mm@...ck.org" <linux-mm@...ck.org>, moritz.lipp@...k.tugraz.at, Daniel Gruss <daniel.gruss@...k.tugraz.at>, michael.schwarz@...k.tugraz.at, Linus Torvalds <torvalds@...ux-foundation.org>, Kees Cook <keescook@...gle.com>, Hugh Dickins <hughd@...gle.com>, X86 ML <x86@...nel.org>, Borislav Petkov <bp@...en8.de>, Josh Poimboeuf <jpoimboe@...hat.com> Subject: Re: KAISER memory layout (Re: [PATCH 06/23] x86, kaiser: introduce user-mapped percpu areas) On 11/02/2017 02:41 AM, Andy Lutomirski wrote: > > - The GDT array. > - The IDT. > - The vsyscall page. We can make this be _PAGE_USER. > - The TSS. > - The per-cpu entry stack. Let's make it one page with guard pages > on either side. This can replace rsp_scratch. > - cpu_current_top_of_stack. This could be in the same page as the TSS. > - The entry text. > - The percpu IST (aka "EXCEPTION") stacks. > > That's it. The PEBS/BTS buffers need it too, I think: https://git.kernel.org/pub/scm/linux/kernel/git/daveh/x86-kaiser.git/commit/?h=kaiser-414rc6-20171031&id=97a334906d7853a8109b295ef94f3991418d0c07
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