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Subject: Re: [PATCHv3 07/17] x86/mm: Preserve KeyID on pte_modify() and
 pgprot_modify()
References: <20180612143915.68065-1-kirill.shutemov@linux.intel.com>
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 <8c31f6d2-6512-2726-763e-6dd1cbb0350a@intel.com>
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From: Dave Hansen <dave.hansen@intel.com>
Message-ID: <c9645eb2-2223-b374-1e30-2c5566ff73c6@intel.com>
Date: Fri, 15 Jun 2018 13:45:21 -0700
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To: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>, x86@kernel.org, Thomas Gleixner <tglx@linutronix.de>, "H. Peter Anvin" <hpa@zytor.com>, Tom Lendacky <thomas.lendacky@amd.com>, Kai Huang <kai.huang@linux.intel.com>, Jacob Pan <jacob.jun.pan@linux.intel.com>, linux-kernel@vger.kernel.org, linux-mm@kvack.org

On 06/15/2018 01:45 PM, Kirill A. Shutemov wrote:
> On Fri, Jun 15, 2018 at 04:58:24PM +0000, Dave Hansen wrote:
>> On 06/15/2018 09:06 AM, Kirill A. Shutemov wrote:
>>> I have no idea what such concept should be called. I cannot come with
>>> anything better than PTE_PFN_MASK_MAX. Do you?
>> PTE_PRESERVE_MASK
>>
>> Or maybe:
>>
>> PTE_MODIFY_PRESERVE_MASK
> It just replacing one confusion with another. Preserve what?

"Preserve this mask when modifying pte permission bits"