linux-kernel - Re: [PATCH, RFC 45/62] mm: Add the encrypt

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Message-ID: <32d5332d-b549-9ffd-b1d1-72dcd83bbb5f@intel.com>
Date:   Tue, 18 Jun 2019 07:13:56 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     Andy Lutomirski <luto@...nel.org>,
        Kai Huang <kai.huang@...ux.intel.com>
Cc:     "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        X86 ML <x86@...nel.org>, Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, Borislav Petkov <bp@...en8.de>,
        Peter Zijlstra <peterz@...radead.org>,
        David Howells <dhowells@...hat.com>,
        Kees Cook <keescook@...omium.org>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>,
        Alison Schofield <alison.schofield@...el.com>,
        Linux-MM <linux-mm@...ck.org>, kvm list <kvm@...r.kernel.org>,
        keyrings@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        Tom Lendacky <thomas.lendacky@....com>
Subject: Re: [PATCH, RFC 45/62] mm: Add the encrypt_mprotect() system call for
 MKTME

On 6/17/19 5:15 PM, Andy Lutomirski wrote:
>>> But I really expect that the encryption of a DAX device will actually
>>> be a block device setting and won't look like this at all.  It'll be
>>> more like dm-crypt except without device mapper.
>> Are you suggesting not to support MKTME for DAX, or adding MKTME support to dm-crypt?
> I'm proposing exposing it by an interface that looks somewhat like
> dm-crypt.  Either we could have a way to create a device layered on
> top of the DAX devices that exposes a decrypted view or we add a way
> to tell the DAX device to kindly use MKTME with such-and-such key.

I think this basically implies that we need to settle (or at least
present) on an interface for storage (FS-DAX, Device DAX, page cache)
before we merge one for anonymous memory.

That sounds like a reasonable exercise.