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Fri, 26 Jun 2020 06:54:07 +0000 (UTC) Received: from [10.36.113.35] (ovpn-113-35.ams2.redhat.com [10.36.113.35]) by smtp.corp.redhat.com (Postfix) with ESMTP id 02BDC5C541; Fri, 26 Jun 2020 06:54:00 +0000 (UTC) Subject: Re: [PATCH v3 0/9] Generalize memory encryption models To: David Gibson Cc: Cornelia Huck , qemu-devel@nongnu.org, brijesh.singh@amd.com, pair@us.ibm.com, pbonzini@redhat.com, dgilbert@redhat.com, frankja@linux.ibm.com, Marcel Apfelbaum , kvm@vger.kernel.org, qemu-ppc@nongnu.org, mst@redhat.com, mdroth@linux.vnet.ibm.com, Richard Henderson , pasic@linux.ibm.com, Eduardo Habkost , qemu-s390x@nongnu.org References: <20200619020602.118306-1-david@gibson.dropbear.id.au> <20200619114526.6a6f70c6.cohuck@redhat.com> <79890826-f67c-2228-e98d-25d2168be3da@redhat.com> <20200619120530.256c36cb.cohuck@redhat.com> <358d48e5-4c57-808b-50da-275f5e2a352c@redhat.com> <20200622140254.0dbe5d8c.cohuck@redhat.com> <20200625052518.GD172395@umbus.fritz.box> <025fb54b-60b7-a58b-e3d7-1bbaad152c5c@redhat.com> <20200626044259.GK172395@umbus.fritz.box> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.8.0 MIME-Version: 1.0 In-Reply-To: <20200626044259.GK172395@umbus.fritz.box> Content-Type: text/plain; charset=windows-1252 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org >>>> Does this have any implications when probing with the 'none' machine? >>> >>> I'm not sure. In your case, I guess the cpu bit would still show up >>> as before, so it would tell you base feature availability, but not >>> whether you can use the new configuration option. >>> >>> Since the HTL option is generic, you could still set it on the "none" >>> machine, though it wouldn't really have any effect. That is, if you >>> could create a suitable object to point it at, which would depend on >>> ... details. >>> >> >> The important point is that we never want the (expanded) host cpu model >> look different when either specifying or not specifying the HTL >> property. > > Ah, yes, I see your point. So my current suggestion will satisfy > that, basically it is: > > cpu has unpack (inc. by default) && htl specified > => works (allowing secure), as expected ack > > !cpu has unpack && htl specified > => bails out with an error ack > > !cpu has unpack && !htl specified > => works for a non-secure guest, as expected > => guest will fail if it attempts to go secure ack, behavior just like running on older hw without unpack > > cpu has unpack && !htl specified > => works as expected for a non-secure guest (unpack feature is > present, but unused) > => secure guest may work "by accident", but only if all virtio > properties have the right values, which is the user's > problem > > That last case is kinda ugly, but I think it's tolerable. Right, we must not affect non-secure guests, and existing secure setups (e.g., older qemu machines). Will have to think about this some more, but does not sound too crazy. Thanks! -- Thanks, David / dhildenb