Re: [RFC v2 04/13] x86/mm: Add helper functions for MKTME memory encryption keys

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To: Alison Schofield <alison.schofield@xxxxxxxxx>
Subject: Re: [RFC v2 04/13] x86/mm: Add helper functions for MKTME memory encryption keys
From: Andy Lutomirski <luto@xxxxxxxxxxxxxx>
Date: Tue, 4 Dec 2018 07:35:50 -0800
Cc: dhowells@xxxxxxxxxx, tglx@xxxxxxxxxxxxx, jmorris@xxxxxxxxx, mingo@xxxxxxxxxx, hpa@xxxxxxxxx, bp@xxxxxxxxx, luto@xxxxxxxxxx, peterz@xxxxxxxxxxxxx, kirill.shutemov@xxxxxxxxxxxxxxx, dave.hansen@xxxxxxxxx, kai.huang@xxxxxxxxx, jun.nakajima@xxxxxxxxx, dan.j.williams@xxxxxxxxx, jarkko.sakkinen@xxxxxxxxx, keyrings@xxxxxxxxxxxxxxx, linux-security-module@xxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, x86@xxxxxxxxxx
In-reply-to: <bd83f72d30ccfc7c1bc7ce9ab81bdf66e78a1d7d.1543903910.git.alison.schofield@intel.com>
References: <cover.1543903910.git.alison.schofield@intel.com> <bd83f72d30ccfc7c1bc7ce9ab81bdf66e78a1d7d.1543903910.git.alison.schofield@intel.com>


> On Dec 3, 2018, at 11:39 PM, Alison Schofield <alison.schofield@xxxxxxxxx> wrote:
> 
> Define a global mapping structure to manage the mapping of userspace
> Keys to hardware KeyIDs in MKTME (Multi-Key Total Memory Encryption).
> Implement helper functions that access this mapping structure.
> 

Why is a key “void *”?  Who owns the memory?  Can a real type be used?

Follow-Ups:
- Re: [RFC v2 04/13] x86/mm: Add helper functions for MKTME memory encryption keys
  - From: Alison Schofield

References:
- [RFC v2 00/13] Multi-Key Total Memory Encryption API (MKTME)
  - From: Alison Schofield
- [RFC v2 04/13] x86/mm: Add helper functions for MKTME memory encryption keys
  - From: Alison Schofield

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