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Re: [for-6.0 v5 00/13] Generalize memory encryption models
From: |
David Gibson |
Subject: |
Re: [for-6.0 v5 00/13] Generalize memory encryption models |
Date: |
Tue, 8 Dec 2020 13:57:28 +1100 |
On Fri, Dec 04, 2020 at 02:12:29PM +0100, Cornelia Huck wrote:
> On Fri, 4 Dec 2020 13:07:27 +0000
> "Dr. David Alan Gilbert" <dgilbert@redhat.com> wrote:
>
> > * Cornelia Huck (cohuck@redhat.com) wrote:
> > > On Fri, 4 Dec 2020 09:06:50 +0100
> > > Christian Borntraeger <borntraeger@de.ibm.com> wrote:
> > >
> > > > On 04.12.20 06:44, David Gibson wrote:
> > > > > A number of hardware platforms are implementing mechanisms whereby the
> > > > > hypervisor does not have unfettered access to guest memory, in order
> > > > > to mitigate the security impact of a compromised hypervisor.
> > > > >
> > > > > AMD's SEV implements this with in-cpu memory encryption, and Intel has
> > > > > its own memory encryption mechanism. POWER has an upcoming mechanism
> > > > > to accomplish this in a different way, using a new memory protection
> > > > > level plus a small trusted ultravisor. s390 also has a protected
> > > > > execution environment.
> > > > >
> > > > > The current code (committed or draft) for these features has each
> > > > > platform's version configured entirely differently. That doesn't seem
> > > > > ideal for users, or particularly for management layers.
> > > > >
> > > > > AMD SEV introduces a notionally generic machine option
> > > > > "machine-encryption", but it doesn't actually cover any cases other
> > > > > than SEV.
> > > > >
> > > > > This series is a proposal to at least partially unify configuration
> > > > > for these mechanisms, by renaming and generalizing AMD's
> > > > > "memory-encryption" property. It is replaced by a
> > > > > "securable-guest-memory" property pointing to a platform specific
> > > >
> > > > Can we do "securable-guest" ?
> > > > s390x also protects registers and integrity. memory is only one piece
> > > > of the puzzle and what we protect might differ from platform to
> > > > platform.
> > > >
> > >
> > > I agree. Even technologies that currently only do memory encryption may
> > > be enhanced with more protections later.
> >
> > There's already SEV-ES patches onlist for this on the SEV side.
> >
> > <sigh on haggling over the name>
> >
> > Perhaps 'confidential guest' is actually what we need, since the
> > marketing folks seem to have started labelling this whole idea
> > 'confidential computing'.
That's not a bad idea, much as I usually hate marketing terms. But it
does seem to be becoming a general term for this style of thing, and
it doesn't overlap too badly with other terms ("secure" and
"protected" are also used for hypervisor-from-guest and
guest-from-guest protection).
> It's more like a 'possibly confidential guest', though.
Hmm. What about "Confidential Guest Facility" or "Confidential Guest
Mechanism"? The implication being that the facility is there, whether
or not the guest actually uses it.
--
David Gibson | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/~dgibson
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- Re: [for-6.0 v5 12/13] securable guest memory: Alter virtio default properties for protected guests, (continued)
- [for-6.0 v5 10/13] spapr: Add PEF based securable guest memory, David Gibson, 2020/12/04
- [for-6.0 v5 13/13] s390: Recognize securable-guest-memory option, David Gibson, 2020/12/04
- Re: [for-6.0 v5 00/13] Generalize memory encryption models, Christian Borntraeger, 2020/12/04
- Re: [for-6.0 v5 00/13] Generalize memory encryption models, Cornelia Huck, 2020/12/04
- Re: [for-6.0 v5 00/13] Generalize memory encryption models, Dr. David Alan Gilbert, 2020/12/04
- Re: [for-6.0 v5 00/13] Generalize memory encryption models, Cornelia Huck, 2020/12/04
- Re: [for-6.0 v5 00/13] Generalize memory encryption models,
David Gibson <=
- Re: [for-6.0 v5 00/13] Generalize memory encryption models, Cornelia Huck, 2020/12/08
- Re: [for-6.0 v5 00/13] Generalize memory encryption models, David Gibson, 2020/12/17
- Re: [for-6.0 v5 00/13] Generalize memory encryption models, Cornelia Huck, 2020/12/17
- Re: [for-6.0 v5 00/13] Generalize memory encryption models, Daniel P . Berrangé, 2020/12/04
- Re: [for-6.0 v5 00/13] Generalize memory encryption models, Halil Pasic, 2020/12/04
- Re: [for-6.0 v5 00/13] Generalize memory encryption models, David Gibson, 2020/12/07
Re: [for-6.0 v5 00/13] Generalize memory encryption models, Daniel P . Berrangé, 2020/12/04