From: Greg Kurz <groug@kaod.org>
To: David Gibson <david@gibson.dropbear.id.au>
Cc: Thiago Jung Bauermann <bauerman@linux.ibm.com>,
pair@us.ibm.com, brijesh.singh@amd.com, frankja@linux.ibm.com,
kvm@vger.kernel.org, "Michael S. Tsirkin" <mst@redhat.com>,
cohuck@redhat.com, qemu-devel@nongnu.org, dgilbert@redhat.com,
qemu-ppc@nongnu.org,
Marcel Apfelbaum <marcel.apfelbaum@gmail.com>,
Paolo Bonzini <pbonzini@redhat.com>,
Richard Henderson <rth@twiddle.net>,
mdroth@linux.vnet.ibm.com, Eduardo Habkost <ehabkost@redhat.com>
Subject: Re: [RFC v2 00/18] Refactor configuration of guest memory protection
Date: Thu, 4 Jun 2020 11:08:21 +0200 [thread overview]
Message-ID: <20200604105228.2cb311d3@kaod.org> (raw)
In-Reply-To: <20200604064414.GI228651@umbus.fritz.box>
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On Thu, 4 Jun 2020 16:44:14 +1000
David Gibson <david@gibson.dropbear.id.au> wrote:
> On Thu, Jun 04, 2020 at 01:39:22AM -0300, Thiago Jung Bauermann wrote:
> >
> > Hello David,
> >
> > David Gibson <david@gibson.dropbear.id.au> writes:
> >
> > > 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
> > > "guest-memory-protection" property pointing to a platform specific
> > > object which configures and manages the specific details.
> > >
> > > For now this series covers just AMD SEV and POWER PEF. I'm hoping it
> >
> > Thank you very much for this series! Using a machine property is a nice
> > way of configuring this.
> >
> > >From an end-user perspective, `-M pseries,guest-memory-protection` in
> > the command line already expresses everything that QEMU needs to know,
> > so having to add `-object pef-guest,id=pef0` seems a bit redundant. Is
> > it possible to make QEMU create the pef-guest object behind the scenes
> > when the guest-memory-protection property is specified?
> >
> > Regardless, I was able to successfuly launch POWER PEF guests using
> > these patches:
> >
> > Tested-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>
> >
> > > can be extended to cover the Intel and s390 mechanisms as well,
> > > though.
> > >
> > > Note: I'm using the term "guest memory protection" throughout to refer
> > > to mechanisms like this. I don't particular like the term, it's both
> > > long and not really precise. If someone can think of a succinct way
> > > of saying "a means of protecting guest memory from a possibly
> > > compromised hypervisor", I'd be grateful for the suggestion.
> >
> > Is "opaque guest memory" any better? It's slightly shorter, and slightly
> > more precise about what the main characteristic this guest property conveys.
>
> That's not a bad one, but for now I'm going with "host trust
> limitation", since this might end up covering things other than just
> memory protection.
>
Any idea what these other things might be ? It seems a bit hard to
decide of a proper name without a broader picture at this point.
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next prev parent reply other threads:[~2020-06-04 9:45 UTC|newest]
Thread overview: 90+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-21 3:42 [RFC v2 00/18] Refactor configuration of guest memory protection David Gibson
2020-05-21 3:42 ` [RFC v2 01/18] target/i386: sev: Remove unused QSevGuestInfoClass David Gibson
2020-05-29 9:01 ` Philippe Mathieu-Daudé
2020-06-02 3:04 ` Richard Henderson
2020-05-21 3:42 ` [RFC v2 02/18] target/i386: sev: Move local structure definitions into .c file David Gibson
2020-05-29 9:03 ` Philippe Mathieu-Daudé
2020-06-02 3:05 ` Richard Henderson
2020-05-21 3:42 ` [RFC v2 03/18] target/i386: sev: Rename QSevGuestInfo David Gibson
2020-05-29 9:05 ` Philippe Mathieu-Daudé
2020-06-02 3:06 ` Richard Henderson
2020-05-21 3:42 ` [RFC v2 04/18] target/i386: sev: Embed SEVState in SevGuestState David Gibson
2020-05-29 9:09 ` Philippe Mathieu-Daudé
2020-06-04 3:15 ` David Gibson
2020-06-02 3:07 ` Richard Henderson
2020-05-21 3:42 ` [RFC v2 05/18] target/i386: sev: Partial cleanup to sev_state global David Gibson
2020-06-02 3:08 ` Richard Henderson
2020-05-21 3:42 ` [RFC v2 06/18] target/i386: sev: Remove redundant cbitpos and reduced_phys_bits fields David Gibson
2020-05-29 9:11 ` Philippe Mathieu-Daudé
2020-06-02 3:09 ` Richard Henderson
2020-05-21 3:42 ` [RFC v2 07/18] target/i386: sev: Remove redundant policy field David Gibson
2020-06-02 3:13 ` Richard Henderson
2020-05-21 3:42 ` [RFC v2 08/18] target/i386: sev: Remove redundant handle field David Gibson
2020-06-02 3:16 ` Richard Henderson
2020-05-21 3:42 ` [RFC v2 09/18] target/i386: sev: Unify SEVState and SevGuestState David Gibson
2020-05-29 9:13 ` Philippe Mathieu-Daudé
2020-06-02 3:18 ` Richard Henderson
2020-05-21 3:42 ` [RFC v2 10/18] guest memory protection: Add guest memory protection interface David Gibson
2020-05-25 10:27 ` Greg Kurz
2020-06-03 10:09 ` David Gibson
2020-06-02 1:44 ` Richard Henderson
2020-06-03 10:09 ` David Gibson
2020-05-21 3:42 ` [RFC v2 11/18] guest memory protection: Handle memory encrption via interface David Gibson
2020-05-25 10:26 ` Greg Kurz
2020-06-04 3:27 ` David Gibson
2020-06-02 3:21 ` Richard Henderson
2020-05-21 3:42 ` [RFC v2 12/18] guest memory protection: Perform KVM init " David Gibson
2020-06-02 3:39 ` Richard Henderson
2020-06-02 3:45 ` Richard Henderson
2020-05-21 3:42 ` [RFC v2 13/18] guest memory protection: Move side effect out of machine_set_memory_encryption() David Gibson
2020-06-02 3:41 ` Richard Henderson
2020-05-21 3:43 ` [RFC v2 14/18] guest memory protection: Rework the "memory-encryption" property David Gibson
2020-06-02 3:54 ` Richard Henderson
2020-06-04 5:56 ` David Gibson
2020-06-04 6:19 ` Thomas Huth
2020-06-04 6:25 ` David Gibson
2020-05-21 3:43 ` [RFC v2 15/18] guest memory protection: Decouple kvm_memcrypt_*() helpers from KVM David Gibson
2020-06-02 4:13 ` Richard Henderson
2020-06-03 10:18 ` David Gibson
2020-05-21 3:43 ` [RFC v2 16/18] guest memory protection: Add Error ** to GuestMemoryProtection::kvm_init David Gibson
2020-05-29 9:16 ` Philippe Mathieu-Daudé
2020-06-02 4:15 ` Richard Henderson
2020-05-21 3:43 ` [RFC v2 17/18] spapr: Added PEF based guest memory protection David Gibson
2020-05-25 11:14 ` Greg Kurz
2020-05-29 7:59 ` Ram Pai
2020-06-04 3:46 ` David Gibson
2020-05-21 3:43 ` [RFC v2 18/18] guest memory protection: Alter virtio default properties for protected guests David Gibson
2020-06-05 10:45 ` Cornelia Huck
2020-06-05 16:04 ` Halil Pasic
2020-06-06 20:21 ` Michael S. Tsirkin
2020-06-07 3:07 ` David Gibson
2020-06-09 10:16 ` Cornelia Huck
2020-06-09 15:40 ` Halil Pasic
2020-06-09 15:57 ` Cornelia Huck
2020-06-09 16:01 ` Michael S. Tsirkin
2020-06-10 4:45 ` David Gibson
2020-06-10 4:39 ` David Gibson
2020-06-10 8:48 ` Cornelia Huck
2020-06-10 10:07 ` David Gibson
2020-06-10 13:21 ` Halil Pasic
2020-05-29 22:19 ` [RFC v2 00/18] Refactor configuration of guest memory protection Sean Christopherson
2020-06-01 9:16 ` Dr. David Alan Gilbert
2020-06-04 3:11 ` David Gibson
2020-06-04 16:20 ` Sean Christopherson
2020-06-04 3:05 ` David Gibson
2020-06-04 4:39 ` Thiago Jung Bauermann
2020-06-04 6:21 ` David Gibson
2020-06-04 21:54 ` Thiago Jung Bauermann
2020-06-04 22:47 ` Paolo Bonzini
2020-06-04 23:30 ` Thiago Jung Bauermann
2020-06-04 23:41 ` Paolo Bonzini
2020-06-05 20:01 ` Thiago Jung Bauermann
2020-06-06 8:24 ` David Gibson
2020-06-08 15:10 ` Thiago Jung Bauermann
2020-06-04 6:44 ` David Gibson
2020-06-04 9:08 ` Greg Kurz [this message]
2020-06-06 8:45 ` David Gibson
2020-06-05 10:55 ` Cornelia Huck
2020-06-06 8:44 ` David Gibson
2020-06-09 10:11 ` Halil Pasic
2020-06-10 4:36 ` David Gibson
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