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Date:   Tue, 6 Mar 2018 11:36:42 +0300
From:   "Kirill A. Shutemov" <kirill@shutemov.name>
To:     Dave Hansen <dave.hansen@intel.com>
Cc:     "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
        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>,
        linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [RFC, PATCH 18/22] x86/mm: Handle allocation of encrypted pages
Message-ID: <20180306083642.yrhbcuz7fgwhmlix@node.shutemov.name>
References: <20180305162610.37510-1-kirill.shutemov@linux.intel.com>
 <20180305162610.37510-19-kirill.shutemov@linux.intel.com>
 <6551765a-5926-8445-d867-8f7c6bf343b4@intel.com>
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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