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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Fri, 13 Mar 2020 13:18:17 -0000 Received: from d06av24.portsmouth.uk.ibm.com (d06av24.portsmouth.uk.ibm.com [9.149.105.60]) by b06cxnps4074.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 02DDIGQE48169004 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK) for ; Fri, 13 Mar 2020 13:18:16 GMT Received: from d06av24.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id A2DFF42041 for ; Fri, 13 Mar 2020 13:18:16 +0000 (GMT) Received: from d06av24.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 79A5142047 for ; Fri, 13 Mar 2020 13:18:16 +0000 (GMT) Received: from localhost.localdomain (unknown [9.145.48.117]) by d06av24.portsmouth.uk.ibm.com (Postfix) with ESMTP for ; Fri, 13 Mar 2020 13:18:16 +0000 (GMT) Subject: Re: [PATCH v9 14/15] docs: Add protvirt docs To: qemu-devel@nongnu.org References: <20200311132151.172389-1-frankja@linux.ibm.com> <20200311132151.172389-15-frankja@linux.ibm.com> <20200313140057.0c5d90c4@p-imbrenda> 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: <20200313140057.0c5d90c4@p-imbrenda> Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="GhNjGN0I6SHYwW2cRkFITb6Ai9clKPEl0" X-TM-AS-GCONF: 00 x-cbid: 20031313-0012-0000-0000-000003907904 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 20031313-0013-0000-0000-000021CD4E96 Message-Id: <1d901ba3-a25f-218e-d619-f6f24c0dd842@linux.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.138, 18.0.572 definitions=2020-03-13_04:2020-03-12, 2020-03-13 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 priorityscore=1501 mlxscore=0 spamscore=0 suspectscore=1 clxscore=1015 adultscore=0 bulkscore=0 phishscore=0 mlxlogscore=999 malwarescore=0 impostorscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2003130069 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: , 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) --GhNjGN0I6SHYwW2cRkFITb6Ai9clKPEl0 Content-Type: multipart/mixed; boundary="LJRVeLP2cSd93MFovfDZqXQNlhIFP43yN" --LJRVeLP2cSd93MFovfDZqXQNlhIFP43yN Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable On 3/13/20 2:00 PM, Claudio Imbrenda wrote: > On Wed, 11 Mar 2020 09:21:50 -0400 > Janosch Frank wrote: >=20 >> Lets add some documentation for the Protected VM functionality. >> >> 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/index.rst b/docs/system/index.rst >> index 6e5f20fa1333ce23..74afbd7cc3fc0296 100644 >> --- a/docs/system/index.rst >> +++ b/docs/system/index.rst >> @@ -34,3 +34,4 @@ Contents: >> deprecated >> build-platforms >> license >> + protvirt >> 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 >> are +encrypted and can only be decrypted by the firmware, represented >> by an +entity called Ultravisor, of specific IBM Z machines. >> + >> + >> +Prerequisites >> +------------- >> + >> +To run PVMs a machine with the Protected Virtualization feature >> +which is indicated by the Ultravisor Call facility (stfle bit >> +158) is required. The Ultravisor needs to be initialized at boot by >> +setting `prot_virt=3D1` on the kernel command line. >=20 > I'd add "of the host" just to make it extra clear How about: =2E..on the host kernel command line >=20 >> + >> +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 >> huge +pages as indicated by its facilities. >> + >> + >> +Boot Process >> +------------ >> + >> +A secure guest image can either be loaded from disk or supplied on >> the +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 >> +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 >> PVM +image is done by genprotimg of the s390-tools package. >=20 > Reviewed-by: Claudio Imbrenda Thanks! --LJRVeLP2cSd93MFovfDZqXQNlhIFP43yN-- --GhNjGN0I6SHYwW2cRkFITb6Ai9clKPEl0 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAEBCAAdFiEEwGNS88vfc9+v45Yq41TmuOI4ufgFAl5riBgACgkQ41TmuOI4 ufiOPhAAyqS2Q87qFgpjMxxfdECIcjB0idvKFgxRuKewsVyByrp4yzQ/0jGh8Zrh fzmPB0XjCAueaj36iWhvtE37bZBqV5+5W7DOpyyqWsTBwYT2C2QMmBdCk90KUFaz B+u6Zq/o7kYLzdeicm65C1Rrs1EgKzkt+i4tmpDMmFyHIlgexAaBXaQbNxlmfIpL 4tIZIFJESsNJTQAfXDvFLtTlH9kMCznySgm7/aeieC64KhdZRftkXLBcplJ1RhFA XF2ZfqhryLQt8dkQtr8y6gbjopIx0qMGvvlJL+VshtlwhhSM2VCtPz21sWC8IkDh FxPDLsHE4S4GAxDU3Qr+/6SAQPRLgu1h+yi0uahl4BqwQ1h1QAsirKe7e0hg9odt gwfSLRHPPPWM1BneRP6VbVOk7suva1mEIhhyB84PohCRNpKuIc85NK4wGXQjYDxO tSzQCG1JYjhC2iCOFNaYHHf89o4mLqaGC1YiTuOYeOVEsjXa7xu0im5c+B/JmUa3 C59Ue/sUTOp9rWdoQXwaplI6IQOnrcXlvWE2asQYJNyxcINzA3IWrSaCKQH2Wmc7 fU3ZOzFVGhUwpPLHcCPW8qW6cAQjgI3E0O3RViIoDfrs2bIsYdyi60ilGxeM8koe 1Fz9BCvdVVfaSNzxXTRCGwBNfHQ0bPxfBFLQ0VOmA8whQ47gOSE= =Z+ZC -----END PGP SIGNATURE----- --GhNjGN0I6SHYwW2cRkFITb6Ai9clKPEl0--