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Subject: Re: [PATCH 10/16] x86/mm/pti: Populate valid user pud entries
References: <1516120619-1159-1-git-send-email-joro@8bytes.org>
 <1516120619-1159-11-git-send-email-joro@8bytes.org>
From: Dave Hansen <dave.hansen@intel.com>
Message-ID: <be22c252-3467-d14d-816b-023456604030@intel.com>
Date: Tue, 16 Jan 2018 10:06:48 -0800
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To: Joerg Roedel <joro@8bytes.org>, Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@kernel.org>, "H . Peter Anvin" <hpa@zytor.com>
Cc: x86@kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, Linus Torvalds <torvalds@linux-foundation.org>, Andy Lutomirski <luto@kernel.org>, Josh Poimboeuf <jpoimboe@redhat.com>, Juergen Gross <jgross@suse.com>, Peter Zijlstra <peterz@infradead.org>, Borislav Petkov <bp@alien8.de>, Jiri Kosina <jkosina@suse.cz>, Boris Ostrovsky <boris.ostrovsky@oracle.com>, Brian Gerst <brgerst@gmail.com>, David Laight <David.Laight@aculab.com>, Denys Vlasenko <dvlasenk@redhat.com>, Eduardo Valentin <eduval@amazon.com>, Greg KH <gregkh@linuxfoundation.org>, Will Deacon <will.deacon@arm.com>, aliguori@amazon.com, daniel.gruss@iaik.tugraz.at, hughd@google.com, keescook@google.com, Andrea Arcangeli <aarcange@redhat.com>, Waiman Long <llong@redhat.com>, jroedel@suse.de

On 01/16/2018 08:36 AM, Joerg Roedel wrote:
> 
> In PAE page-tables at the top-level most bits we usually set
> with _KERNPG_TABLE are reserved, resulting in a #GP when
> they are loaded by the processor.

Can you save me the trip to the SDM and remind me which bits actually
cause trouble here?

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