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spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:44476 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1l0S9n-0007dp-24 for qemu-devel@archiver.kernel.org; Fri, 15 Jan 2021 11:41:03 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:57700) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1l0S67-0003fk-J5 for qemu-devel@nongnu.org; Fri, 15 Jan 2021 11:37:16 -0500 Received: from us-smtp-delivery-124.mimecast.com ([63.128.21.124]:49698) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1l0S63-0007Bv-28 for qemu-devel@nongnu.org; Fri, 15 Jan 2021 11:37:15 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1610728629; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=E0t/p6vUdTuxz2CXDj8S/giucsDXUc9V39NGSrWnCzY=; b=SFQB7zQu1TTyZb3tp9CsOKTM9GV3zDh6S6q+3cM2xJzgLSKmbb5PQZB5onV/7nDt9F7Vsx rqgTh2oUZMJkwhtu2L6zGafp+KGwx7yOPURUGNN9qYyAdqqABIbcryekJ48+eyuWX1Drc3 PUBCnaqxpgnSW6Gsaua6mt/nhuhpaTw= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-534-ukYfi6LcNViM1F8nOD-P5Q-1; Fri, 15 Jan 2021 11:37:06 -0500 X-MC-Unique: ukYfi6LcNViM1F8nOD-P5Q-1 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id B77B2190A7A0; Fri, 15 Jan 2021 16:37:03 +0000 (UTC) Received: from gondolin (ovpn-114-124.ams2.redhat.com [10.36.114.124]) by smtp.corp.redhat.com (Postfix) with ESMTP id 0133E6E50A; Fri, 15 Jan 2021 16:36:50 +0000 (UTC) Date: Fri, 15 Jan 2021 17:36:47 +0100 From: Cornelia Huck To: David Gibson Subject: Re: [PATCH v7 13/13] s390: Recognize confidential-guest-support option Message-ID: <20210115173647.28f4cc9e.cohuck@redhat.com> In-Reply-To: <20210113235811.1909610-14-david@gibson.dropbear.id.au> References: <20210113235811.1909610-1-david@gibson.dropbear.id.au> <20210113235811.1909610-14-david@gibson.dropbear.id.au> Organization: Red Hat GmbH MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 Received-SPF: pass client-ip=63.128.21.124; envelope-from=cohuck@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -29 X-Spam_score: -3.0 X-Spam_bar: --- X-Spam_report: (-3.0 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.25, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: pair@us.ibm.com, brijesh.singh@amd.com, kvm@vger.kernel.org, David Hildenbrand , qemu-devel@nongnu.org, frankja@linux.ibm.com, pragyansri.pathi@intel.com, mst@redhat.com, mdroth@linux.vnet.ibm.com, pasic@linux.ibm.com, borntraeger@de.ibm.com, andi.kleen@intel.com, thuth@redhat.com, Eduardo Habkost , Richard Henderson , dgilbert@redhat.com, Greg Kurz , qemu-s390x@nongnu.org, jun.nakajima@intel.com, berrange@redhat.com, Marcelo Tosatti , qemu-ppc@nongnu.org, Paolo Bonzini Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On Thu, 14 Jan 2021 10:58:11 +1100 David Gibson 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 > --- > 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.