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Subject: Re: [PATCH 10/16] x86/mm/pti: Populate valid user pud entries
To: Joerg Roedel <joro@8bytes.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@kernel.org>,
        "H . Peter Anvin" <hpa@zytor.com>
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Cc: x86@kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org,
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From: Dave Hansen <dave.hansen@intel.com>
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Date: Tue, 16 Jan 2018 10:06:48 -0800
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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?