From: David Gibson <david@gibson.dropbear.id.au>
To: Cornelia Huck <cohuck@redhat.com>
Cc: brijesh.singh@amd.com, pair@us.ibm.com, dgilbert@redhat.com,
pasic@linux.ibm.com, qemu-devel@nongnu.org,
Richard Henderson <richard.henderson@linaro.org>,
Marcelo Tosatti <mtosatti@redhat.com>,
David Hildenbrand <david@redhat.com>,
borntraeger@de.ibm.com,
Marcel Apfelbaum <marcel.apfelbaum@gmail.com>,
Paolo Bonzini <pbonzini@redhat.com>,
mst@redhat.com, jun.nakajima@intel.com, thuth@redhat.com,
pragyansri.pathi@intel.com, kvm@vger.kernel.org,
Eduardo Habkost <ehabkost@redhat.com>,
qemu-s390x@nongnu.org, qemu-ppc@nongnu.org,
frankja@linux.ibm.com, Greg Kurz <groug@kaod.org>,
mdroth@linux.vnet.ibm.com, berrange@redhat.com,
andi.kleen@intel.com
Subject: Re: [PATCH v7 08/13] confidential guest support: Move SEV initialization into arch specific code
Date: Fri, 29 Jan 2021 14:12:40 +1100 [thread overview]
Message-ID: <20210129031240.GK6951@yekko.fritz.box> (raw)
In-Reply-To: <20210118090336.1e708346.cohuck@redhat.com>
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On Mon, Jan 18, 2021 at 09:03:36AM +0100, Cornelia Huck wrote:
> On Mon, 18 Jan 2021 14:03:08 +1100
> David Gibson <david@gibson.dropbear.id.au> wrote:
>
> > On Fri, Jan 15, 2021 at 02:24:25PM +0100, Cornelia Huck wrote:
> > > On Thu, 14 Jan 2021 10:58:06 +1100
> > > David Gibson <david@gibson.dropbear.id.au> wrote:
> > >
> > > > While we've abstracted some (potential) differences between mechanisms for
> > > > securing guest memory, the initialization is still specific to SEV. Given
> > > > that, move it into x86's kvm_arch_init() code, rather than the generic
> > > > kvm_init() code.
> > > >
> > > > Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
> > > > ---
> > > > accel/kvm/kvm-all.c | 14 --------------
> > > > accel/kvm/sev-stub.c | 4 ++--
> > > > target/i386/kvm/kvm.c | 12 ++++++++++++
> > > > target/i386/sev.c | 7 ++++++-
> > > > 4 files changed, 20 insertions(+), 17 deletions(-)
> > > >
> > >
> > > (...)
> > >
> > > > @@ -2135,6 +2136,17 @@ int kvm_arch_init(MachineState *ms, KVMState *s)
> > > > uint64_t shadow_mem;
> > > > int ret;
> > > > struct utsname utsname;
> > > > + Error *local_err = NULL;
> > > > +
> > > > + /*
> > > > + * if memory encryption object is specified then initialize the
> > > > + * memory encryption context (no-op otherwise)
> > > > + */
> > > > + ret = sev_kvm_init(ms->cgs, &local_err);
> > >
> > > Maybe still leave a comment here, as the code will still need to be
> > > modified to handle non-SEV x86 mechanisms?
> >
> > Uh.. I'm confused.. this hunk is adding a comment, not removing one..
>
> Yes, but there was a "TODO: handle non-SEV" comment before. This will
> probably need some massaging if we add Intel mechanisms?
Technically, not exactly. New mechanisms would have their own
initialization, which might go adjacent to this, or could be somewhere
else - the sev_kvm_init() is a no-op if a non-SEV mechanism is
selected (currently impossible).
The distinction is pretty subtle, though, so I've altered the comment
here in a way I hope explains 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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next prev parent reply other threads:[~2021-01-29 5:09 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-13 23:57 [PATCH v7 00/13] Generalize memory encryption models David Gibson
2021-01-13 23:57 ` [PATCH v7 01/13] qom: Allow optional sugar props David Gibson
2021-01-13 23:58 ` [PATCH v7 02/13] confidential guest support: Introduce new confidential guest support class David Gibson
2021-01-14 9:34 ` Daniel P. Berrangé
2021-01-14 10:42 ` David Gibson
2021-01-18 18:51 ` Dr. David Alan Gilbert
2021-01-21 1:06 ` David Gibson
2021-01-21 9:08 ` Dr. David Alan Gilbert
2021-01-29 2:32 ` David Gibson
2021-01-13 23:58 ` [PATCH v7 03/13] sev: Remove false abstraction of flash encryption David Gibson
2021-01-15 12:54 ` Cornelia Huck
2021-01-18 2:59 ` David Gibson
2021-01-13 23:58 ` [PATCH v7 04/13] confidential guest support: Move side effect out of machine_set_memory_encryption() David Gibson
2021-01-15 12:56 ` Cornelia Huck
2021-01-13 23:58 ` [PATCH v7 05/13] confidential guest support: Rework the "memory-encryption" property David Gibson
2021-01-15 13:06 ` Cornelia Huck
2021-01-13 23:58 ` [PATCH v7 06/13] sev: Add Error ** to sev_kvm_init() David Gibson
2021-01-13 23:58 ` [PATCH v7 07/13] confidential guest support: Introduce cgs "ready" flag David Gibson
2021-01-14 8:55 ` Greg Kurz
2021-01-15 13:12 ` Cornelia Huck
2021-01-18 19:47 ` Dr. David Alan Gilbert
2021-01-19 8:16 ` Cornelia Huck
2021-02-02 1:41 ` David Gibson
2021-01-13 23:58 ` [PATCH v7 08/13] confidential guest support: Move SEV initialization into arch specific code David Gibson
2021-01-15 13:24 ` Cornelia Huck
2021-01-18 3:03 ` David Gibson
2021-01-18 8:03 ` Cornelia Huck
2021-01-29 3:12 ` David Gibson [this message]
2021-01-13 23:58 ` [PATCH v7 09/13] confidential guest support: Update documentation David Gibson
2021-01-14 10:07 ` Greg Kurz
2021-01-15 15:36 ` Cornelia Huck
2021-01-29 2:36 ` David Gibson
2021-01-13 23:58 ` [PATCH v7 10/13] spapr: Add PEF based confidential guest support David Gibson
2021-01-15 15:41 ` Cornelia Huck
2021-01-29 2:43 ` David Gibson
2021-01-13 23:58 ` [PATCH v7 11/13] spapr: PEF: prevent migration David Gibson
2021-01-13 23:58 ` [PATCH v7 12/13] confidential guest support: Alter virtio default properties for protected guests David Gibson
2021-01-13 23:58 ` [PATCH v7 13/13] s390: Recognize confidential-guest-support option David Gibson
2021-01-14 9:10 ` Christian Borntraeger
2021-01-14 9:19 ` Christian Borntraeger
2021-01-14 9:24 ` Christian Borntraeger
2021-01-15 0:13 ` David Gibson
2021-01-14 11:45 ` David Gibson
2021-01-15 16:36 ` Cornelia Huck
2021-01-18 17:06 ` Christian Borntraeger
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