linux-kernel - Re: [PATCHv5 18/19] x86/mm: Handle encrypted memory in page_to_virt() and _

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Date:   Thu, 26 Jul 2018 10:26:23 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     "Kirill A. Shutemov" <kirill@...temov.name>,
        Thomas Gleixner <tglx@...utronix.de>
Cc:     "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>,
        Tom Lendacky <thomas.lendacky@....com>,
        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 18/19] x86/mm: Handle encrypted memory in page_to_virt()
 and __pa()

On 07/23/2018 03:12 AM, Kirill A. Shutemov wrote:
> page_to_virt() definition overwrites default macros provided by
> <linux/mm.h>. We only overwrite the macros if MTKME is enabled
> compile-time.

Can you remind me why we need this in page_to_virt() as opposed to in
the kmap() code?  Is it because we have lots of 64-bit code that doesn't
use kmap() or something?