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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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  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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