From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0484DC10DCE for ; Wed, 18 Mar 2020 12:35:27 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id C4E6B20767 for ; Wed, 18 Mar 2020 12:35:27 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C4E6B20767 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.ibm.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:50156 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jEXuw-0000dK-Pb for qemu-devel@archiver.kernel.org; Wed, 18 Mar 2020 08:35:26 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:44040) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jEXu8-0008V4-Jg for qemu-devel@nongnu.org; Wed, 18 Mar 2020 08:34:37 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1jEXu7-0000dR-AC for qemu-devel@nongnu.org; Wed, 18 Mar 2020 08:34:36 -0400 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:23068) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1jEXu7-0000cz-2W for qemu-devel@nongnu.org; Wed, 18 Mar 2020 08:34:35 -0400 Received: from pps.filterd (m0187473.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id 02ICWf7A166701 for ; Wed, 18 Mar 2020 08:34:34 -0400 Received: from e06smtp04.uk.ibm.com (e06smtp04.uk.ibm.com [195.75.94.100]) by mx0a-001b2d01.pphosted.com with ESMTP id 2yu8ad600n-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Wed, 18 Mar 2020 08:34:31 -0400 Received: from localhost by e06smtp04.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Wed, 18 Mar 2020 12:34:15 -0000 Received: from b06wcsmtp001.portsmouth.uk.ibm.com (b06wcsmtp001.portsmouth.uk.ibm.com [9.149.105.160]) by b06cxnps3075.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 02ICYEnG58130564 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 18 Mar 2020 12:34:14 GMT Received: from b06wcsmtp001.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id A815BA4068; Wed, 18 Mar 2020 12:34:14 +0000 (GMT) Received: from b06wcsmtp001.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 54F34A4060; Wed, 18 Mar 2020 12:34:14 +0000 (GMT) Received: from localhost.localdomain (unknown [9.145.78.199]) by b06wcsmtp001.portsmouth.uk.ibm.com (Postfix) with ESMTP; Wed, 18 Mar 2020 12:34:14 +0000 (GMT) Subject: Re: [PATCH v9 14/15] docs: Add protvirt docs To: Cornelia Huck References: <20200311132151.172389-1-frankja@linux.ibm.com> <20200311132151.172389-15-frankja@linux.ibm.com> <20200318122546.4285aec0.cohuck@redhat.com> From: Janosch Frank Autocrypt: addr=frankja@linux.ibm.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.2.2 MIME-Version: 1.0 In-Reply-To: <20200318122546.4285aec0.cohuck@redhat.com> Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="W7VuIvXy0q2j3rtMsMffTMabVta6MlS4E" X-TM-AS-GCONF: 00 x-cbid: 20031812-0016-0000-0000-000002F32FDC X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 20031812-0017-0000-0000-00003356B4C6 Message-Id: <3de42810-965e-ad83-eed5-8407e7352a79@linux.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.138, 18.0.645 definitions=2020-03-18_05:2020-03-18, 2020-03-18 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 lowpriorityscore=0 mlxscore=0 clxscore=1015 priorityscore=1501 spamscore=0 malwarescore=0 impostorscore=0 suspectscore=0 bulkscore=0 mlxlogscore=999 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2003180059 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [generic] X-Received-From: 148.163.156.1 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: borntraeger@de.ibm.com, qemu-s390x@nongnu.org, qemu-devel@nongnu.org, david@redhat.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --W7VuIvXy0q2j3rtMsMffTMabVta6MlS4E Content-Type: multipart/mixed; boundary="QjByX9Jje6E7q8n207Z2ru2aG4HLelM3D" --QjByX9Jje6E7q8n207Z2ru2aG4HLelM3D Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable On 3/18/20 12:25 PM, Cornelia Huck wrote: > On Wed, 11 Mar 2020 09:21:50 -0400 > Janosch Frank wrote: >=20 >> Lets add some documentation for the Protected VM functionality. >=20 > s/Lets/Let's/ :) >=20 >> >> Signed-off-by: Janosch Frank >> --- >> docs/system/index.rst | 1 + >> docs/system/protvirt.rst | 56 +++++++++++++++++++++++++++++++++++++++= + >> 2 files changed, 57 insertions(+) >> create mode 100644 docs/system/protvirt.rst >> > (...) >> diff --git a/docs/system/protvirt.rst b/docs/system/protvirt.rst >> new file mode 100644 >> index 0000000000000000..6c8cf0f7910eae86 >> --- /dev/null >> +++ b/docs/system/protvirt.rst >> @@ -0,0 +1,56 @@ >> +Protected Virtualization on s390x >> +=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D >> + >> +The memory and most of the registers of Protected Virtual Machines >> +(PVMs) are encrypted or inaccessible to the hypervisor, effectively >> +prohibiting VM introspection when the VM is running. At rest, PVMs ar= e >> +encrypted and can only be decrypted by the firmware, represented by a= n >> +entity called Ultravisor, of specific IBM Z machines. >=20 > Is that specific _generations_ or specific _machines_ (i.e. those with > an appropriate key)? If the latter, maybe add a note that a specific > image is bound to (a) specific machine(s)? >=20 >=20 >> + >> + >> +Prerequisites >> +------------- >=20 > Also, maybe add >=20 > "Running PVMs requires using the KVM hypervisor." >=20 > ? >=20 >> + >> +To run PVMs a machine with the Protected Virtualization feature >> +which is indicated by the Ultravisor Call facility (stfle bit >=20 > maybe s/which is/as/ ? >=20 >> +158) is required. The Ultravisor needs to be initialized at boot by >> +setting `prot_virt=3D1` on the kernel command line. >> + >> +If those requirements are met, the capability `KVM_CAP_S390_PROTECTED= ` >> +will indicate that KVM can support PVMs on that LPAR. >> + >> + >> +QEMU Settings >> +------------- >> + >> +To indicate to the VM that it can transition into protected mode, the= >> +`Unpack facility` (stfle bit 161 represented by the feature >> +`S390_FEAT_UNPACK`) needs to be part of the cpu model of the VM. >> + >> +All I/O devices need to use the IOMMU. >> +Passthrough (vfio) devices are currently not supported. >> + >> +Host huge page backings are not supported. However guests can use hug= e >> +pages as indicated by its facilities. >> + >> + >> +Boot Process >> +------------ >> + >> +A secure guest image can either be loaded from disk or supplied on th= e >> +QEMU command line. Booting from disk is done by the unmodified >> +s390-ccw BIOS. I.e., the bootmap is interpreted, multiple components >> +are read into memory and control is transferred to one of the >> +components (zipl stage3). Stag3 does some fixups and then transfers >=20 > s/Stag3/Stage3/ >=20 >> +control to some program residing in guest memory, which is normally >> +the OS kernel. The secure image has another component prepended >> +(stage3a) that uses the new diag308 subcodes 8 and 10 to trigger the >> +transition into secure mode. >> + >> +Booting from the image supplied via the QEMU command line requires >> +that the file passed via -kernel has the same memory layout as would >> +result from the disk boot. This memory layout includes the encrypted >> +components (kernel, initrd, cmdline), the stage3a loader and >> +metadata. In case this boot method is used, the command line >> +options -initrd and -cmdline are ineffective. The preparation of a PV= M >> +image is done by genprotimg of the s390-tools package. >=20 > "is done via the `genprotimg` tool from the s390-tools collection" >=20 > ? Too many cooks :) Ack to all --QjByX9Jje6E7q8n207Z2ru2aG4HLelM3D-- --W7VuIvXy0q2j3rtMsMffTMabVta6MlS4E Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAEBCAAdFiEEwGNS88vfc9+v45Yq41TmuOI4ufgFAl5yFUUACgkQ41TmuOI4 ufiQxRAAj/tmSJGqLuF94uPiUO+x94goWJTb87Bd8Ir+p+AuoC9D0vr0PqY+oM2k V6VGgDhxDiXckO8gm+SE4zYteqJaZS3BG/GkHAK9JjMkP2NMqlcH1NyeX5rz7JwG W2fOmjzo5/8HkCG65aQJg5snw6ezlsGjV4jI0KIVczoqy9RuxMWVtVJmxb38+hKH ujgkkOqnRn1udRWvFljAbKzVcaPjOzHtOyBHOtAuK7SFO1i6wuUrpU0jLyFUboKQ d2B4T5QItbfP/4LLSW1nMZ5huI/7MnsA5nNyYrX0T5j1qEaOw9QHYum7dP71W811 D0hg9S6QqUEzFP8UwkNJOi/UCyI6UmkRj4eOREgwsbdOyXpfiuUkYc6S+r4xG6EP FNnSAd+6SRo/sRlzLulA1fMCMetcuTC+J/1GkhLJjV6YrjTBhvfi6C4t054K/SmD VkSNR7XHxLTAKSP4Wcyd3Hf+FtuciDx2SckxZOxFvEKe7XDIKnf1IhhBVcOALWR7 RRDI9qXEsltLzdix0LWT210gCixSbhl39CAOkHTWvtjeyGhH+l632jqY6qlJ0QrU mkMNIPzj1FOLnykFDr8lvGGaeVIPs2/9Pk6VpUc4WwJxuaRHI9Y/E9fu+0UWtk8g 2HuqJ4jNnn1tJaJwB0U+NBfqoCkg57kDmP6tRm1RiIZH0xV4SNs= =pohI -----END PGP SIGNATURE----- --W7VuIvXy0q2j3rtMsMffTMabVta6MlS4E--