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From: Cornelia Huck <cohuck@redhat.com>
To: David Gibson <david@gibson.dropbear.id.au>
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 13/13] s390: Recognize confidential-guest-support option
Date: Fri, 15 Jan 2021 17:36:47 +0100	[thread overview]
Message-ID: <20210115173647.28f4cc9e.cohuck@redhat.com> (raw)
In-Reply-To: <20210113235811.1909610-14-david@gibson.dropbear.id.au>

On Thu, 14 Jan 2021 10:58:11 +1100
David Gibson <david@gibson.dropbear.id.au> wrote:

> At least some s390 cpu models support "Protected Virtualization" (PV),
> a mechanism to protect guests from eavesdropping by a compromised
> hypervisor.
> 
> This is similar in function to other mechanisms like AMD's SEV and
> POWER's PEF, which are controlled by the "confidential-guest-support"
> machine option.  s390 is a slightly special case, because we already
> supported PV, simply by using a CPU model with the required feature
> (S390_FEAT_UNPACK).
> 
> To integrate this with the option used by other platforms, we
> implement the following compromise:
> 
>  - When the confidential-guest-support option is set, s390 will
>    recognize it, verify that the CPU can support PV (failing if not)
>    and set virtio default options necessary for encrypted or protected
>    guests, as on other platforms.  i.e. if confidential-guest-support
>    is set, we will either create a guest capable of entering PV mode,
>    or fail outright.
> 
>  - If confidential-guest-support is not set, guests might still be
>    able to enter PV mode, if the CPU has the right model.  This may be
>    a little surprising, but shouldn't actually be harmful.
> 
> To start a guest supporting Protected Virtualization using the new
> option use the command line arguments:
>     -object s390-pv-guest,id=pv0 -machine confidential-guest-support=pv0
> 
> Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
> ---
>  docs/confidential-guest-support.txt |  3 ++
>  docs/system/s390x/protvirt.rst      | 19 ++++++---
>  hw/s390x/pv.c                       | 62 +++++++++++++++++++++++++++++
>  include/hw/s390x/pv.h               |  1 +
>  target/s390x/kvm.c                  |  3 ++
>  5 files changed, 82 insertions(+), 6 deletions(-)
> 

(...)

> +int s390_pv_init(ConfidentialGuestSupport *cgs, Error **errp)
> +{
> +    if (!object_dynamic_cast(OBJECT(cgs), TYPE_S390_PV_GUEST)) {
> +        return 0;
> +    }
> +
> +    if (!s390_has_feat(S390_FEAT_UNPACK)) {
> +        error_setg(errp,
> +                   "CPU model does not support Protected Virtualization");
> +        return -1;
> +    }
> +
> +    cgs->ready = true;
> +
> +    return 0;
> +}

Do we want to add a migration blocker here? If we keep the one that is
added when the guest transitions, we'll end up with two of them, but
that might be easier than trying to unify it.


  parent reply	other threads:[~2021-01-15 16:38 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
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 [this message]
2021-01-18 17:06     ` Christian Borntraeger

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