linux-kernel - Re: [RFC, PATCH 18/22] x86/mm: Handle allocation of encrypted pages

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Message-ID: <20180306083642.yrhbcuz7fgwhmlix@node.shutemov.name>
Date:   Tue, 6 Mar 2018 11:36:42 +0300
From:   "Kirill A. Shutemov" <kirill@...temov.name>
To:     Dave Hansen <dave.hansen@...el.com>
Cc:     "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>,
        Kai Huang <kai.huang@...ux.intel.com>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [RFC, PATCH 18/22] x86/mm: Handle allocation of encrypted pages

On Mon, Mar 05, 2018 at 11:07:55AM -0800, Dave Hansen wrote:
> On 03/05/2018 08:26 AM, Kirill A. Shutemov wrote:
> > kmap_atomic_keyid() would map the page with the specified KeyID.
> > For now it's dummy implementation that would be replaced later.
> 
> I think you need to explain the tradeoffs here.  We could just change
> the linear map around, but you don't.  Why?

I don't think we settled on implementation by this point: kmap() is only
interface and doesn't imply what it acctually does. I *can* change linear
mapping if we would chose so.

I will explain the kmap() implementation in patches that would implement
it.

-- 
 Kirill A. Shutemov