linux-kernel - Re: [PATCHv5 07/19] x86/mm: Mask out KeyID bits from page table entry pfn

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Date:   Wed, 18 Jul 2018 16:13:20 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Tom Lendacky <thomas.lendacky@....com>
Cc:     Kai Huang <kai.huang@...ux.intel.com>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCHv5 07/19] x86/mm: Mask out KeyID bits from page table entry
 pfn

On 07/17/2018 04:20 AM, Kirill A. Shutemov wrote:
> +	} else {
> +		/*
> +		 * Reset __PHYSICAL_MASK.
> +		 * Maybe needed if there's inconsistent configuation
> +		 * between CPUs.
> +		 */
> +		physical_mask = (1ULL << __PHYSICAL_MASK_SHIFT) - 1;
> +	}

This seems like an appropriate place for a WARN_ON().  Either that, or
axe this code.