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Mon, 18 May 2020 08:55:25 GMT Received: from b06wcsmtp001.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id A016BA405B; Mon, 18 May 2020 08:55:25 +0000 (GMT) Received: from b06wcsmtp001.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id D50C3A405C; Mon, 18 May 2020 08:55:24 +0000 (GMT) Received: from localhost.localdomain (unknown [9.145.44.214]) by b06wcsmtp001.portsmouth.uk.ibm.com (Postfix) with ESMTP; Mon, 18 May 2020 08:55:24 +0000 (GMT) Subject: Re: [PATCH v2 6/8] s390/sclp: add extended-length sccb support for kvm guest To: Collin Walling , qemu-devel@nongnu.org, qemu-s390x@nongnu.org References: <20200515222032.18838-1-walling@linux.ibm.com> <20200515222032.18838-7-walling@linux.ibm.com> From: Janosch Frank Autocrypt: addr=frankja@linux.ibm.com; prefer-encrypt=mutual; keydata= mQINBFubpD4BEADX0uhkRhkj2AVn7kI4IuPY3A8xKat0ihuPDXbynUC77mNox7yvK3X5QBO6 qLqYr+qrG3buymJJRD9xkp4mqgasHdB5WR9MhXWKH08EvtvAMkEJLnqxgbqf8td3pCQ2cEpv 15mH49iKSmlTcJ+PvJpGZcq/jE42u9/0YFHhozm8GfQdb9SOI/wBSsOqcXcLTUeAvbdqSBZe zuMRBivJQQI1esD9HuADmxdE7c4AeMlap9MvxvUtWk4ZJ/1Z3swMVCGzZb2Xg/9jZpLsyQzb lDbbTlEeyBACeED7DYLZI3d0SFKeJZ1SUyMmSOcr9zeSh4S4h4w8xgDDGmeDVygBQZa1HaoL Esb8Y4avOYIgYDhgkCh0nol7XQ5i/yKLtnNThubAcxNyryw1xSstnKlxPRoxtqTsxMAiSekk 0m3WJwvwd1s878HrQNK0orWd8BzzlSswzjNfQYLF466JOjHPWFOok9pzRs+ucrs6MUwDJj0S cITWU9Rxb04XyigY4XmZ8dywaxwi2ZVTEg+MD+sPmRrTw+5F+sU83cUstuymF3w1GmyofgsU Z+/ldjToHnq21MNa1wx0lCEipCCyE/8K9B9bg9pUwy5lfx7yORP3JuAUfCYb8DVSHWBPHKNj HTOLb2g2UT65AjZEQE95U2AY9iYm5usMqaWD39pAHfhC09/7NQARAQABtCVKYW5vc2NoIEZy YW5rIDxmcmFua2phQGxpbnV4LmlibS5jb20+iQI3BBMBCAAhBQJbm6Q+AhsjBQsJCAcCBhUI CQoLAgQWAgMBAh4BAheAAAoJEONU5rjiOLn4p9gQALjkdj5euJVI2nNT3/IAxAhQSmRhPEt0 AmnCYnuTcHRWPujNr5kqgtyER9+EMQ0ZkX44JU2q7OWxTdSNSAN/5Z7qmOR9JySvDOf4d3mS bMB5zxL9d8SbnSs1uW96H9ZBTlTQnmLfsiM9TetAjSrR8nUmjGhe2YUhJLR1v1LguME+YseT eXnLzIzqqpu311/eYiiIGcmaOjPCE+vFjcXL5oLnGUE73qSYiujwhfPCCUK0850o1fUAYq5p CNBCoKT4OddZR+0itKc/cT6NwEDwdokeg0+rAhxb4Rv5oFO70lziBplEjOxu3dqgIKbHbjza EXTb+mr7VI9O4tTdqrwJo2q9zLqqOfDBi7NDvZFLzaCewhbdEpDYVu6/WxprAY94hY3F4trT rQMHJKQENtF6ZTQc9fcT5I3gAmP+OEvDE5hcTALpWm6Z6SzxO7gEYCnF+qGXqp8sJVrweMub UscyLqHoqdZC2UG4LQ1OJ97nzDpIRe0g6oJ9ZIYHKmfw5jjwH6rASTld5MFWajWdNsqK15k/ RZnHAGICKVIBOBsq26m4EsBlfCdt3b/6emuBjUXR1pyjHMz2awWzCq6/6OWs5eANZ0sdosNq dq2v0ULYTazJz2rlCXV89qRa7ukkNwdBSZNEwsD4eEMicj1LSrqWDZMAALw50L4jxaMD7lPL jJbauQINBFubpD4BEADAcUTRqXF/aY53OSH7IwIK9lFKxIm0IoFkOEh7LMfp7FGzaP7ANrZd cIzhZi38xyOkcaFY+npGEWvko7rlIAn0JpBO4x3hfhmhBD/WSY8LQIFQNNjEm3vzrMo7b9Jb JAqQxfbURY3Dql3GUzeWTG9uaJ00u+EEPlY8zcVShDltIl5PLih20e8xgTnNzx5c110lQSu0 iZv2lAE6DM+2bJQTsMSYiwKlwTuv9LI9Chnoo6+tsN55NqyMxYqJgElk3VzlTXSr3+rtSCwf tq2cinETbzxc1XuhIX6pu/aCGnNfuEkM34b7G1D6CPzDMqokNFbyoO6DQ1+fW6c5gctXg/lZ 602iEl4C4rgcr3+EpfoPUWzKeM8JXv5Kpq4YDxhvbitr8Dm8gr38+UKFZKlWLlwhQ56r/zAU v6LIsm11GmFs2/cmgD1bqBTNHHcTWwWtRTLgmnqJbVisMJuYJt4KNPqphTWsPY8SEtbufIlY HXOJ2lqUzOReTrie2u0qcSvGAbSfec9apTFl2Xko/ddqPcZMpKhBiXmY8tJzSPk3+G4tqur4 6TYAm5ouitJsgAR61Cu7s+PNuq/pTLDhK+6/Njmc94NGBcRA4qTuysEGE79vYWP2oIAU4Fv6 gqaWHZ4MEI2XTqH8wiwzPdCQPYsSE0fXWiYu7ObeErT6iLSTZGx4rQARAQABiQIfBBgBCAAJ BQJbm6Q+AhsMAAoJEONU5rjiOLn4DDEP/RuyckW65SZcPG4cMfNgWxZF8rVjeVl/9PBfy01K 8R0hajU40bWtXSMiby7j0/dMjz99jN6L+AJHJvrLz4qYRzn2Ys843W+RfXj62Zde4YNBE5SL jJweRCbMWKaJLj6499fctxTyeb9+AMLQS4yRSwHuAZLmAb5AyCW1gBcTWZb8ON5BmWnRqeGm IgC1EvCnHy++aBnHTn0m+zV89BhTLTUal35tcjUFwluBY39R2ux/HNlBO1GY3Z+WYXhBvq7q katThLjaQSmnOrMhzqYmdShP1leFTVbzXUUIYv/GbynO/YrL2gaQpaP1bEUEi8lUAfXJbEWG dnHFkciryi092E8/9j89DJg4mmZqOau7TtUxjRMlBcIliXkzSLUk+QvD4LK1kWievJse4mte FBdkWHfP4BH/+8DxapRcG1UAheSnSRQ5LiO50annOB7oXF+vgKIaie2TBfZxQNGAs3RQ+bga DchCqFm5adiSP5+OT4NjkKUeGpBe/aRyQSle/RropTgCi85pje/juYEn2P9UAgkfBJrOHvQ9 Z+2Sva8FRd61NJLkCJ4LFumRn9wQlX2icFbi8UDV3do0hXJRRYTWCxrHscMhkrFWLhYiPF4i phX7UNdOWBQ90qpHyAxHmDazdo27gEjfvsgYMdveKknEOTEb5phwxWgg7BcIDoJf9UMC Message-ID: Date: Mon, 18 May 2020 10:55:24 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.2.2 MIME-Version: 1.0 In-Reply-To: <20200515222032.18838-7-walling@linux.ibm.com> Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="nQR9UOPe9CG83ZJTn7Wmom9HuwFjdi13o" X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.216, 18.0.676 definitions=2020-05-18_03:2020-05-15, 2020-05-18 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 phishscore=0 adultscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 malwarescore=0 suspectscore=0 lowpriorityscore=0 clxscore=1015 cotscore=-2147483648 spamscore=0 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2004280000 definitions=main-2005180078 Received-SPF: pass client-ip=148.163.156.1; envelope-from=frankja@linux.ibm.com; helo=mx0a-001b2d01.pphosted.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/05/18 04:50:19 X-ACL-Warn: Detected OS = Linux 3.x [generic] X-Spam_score_int: -25 X-Spam_score: -2.6 X-Spam_bar: -- X-Spam_report: (-2.6 / 5.0 requ) BAYES_00=-1.9, KHOP_DYNAMIC=0.001, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-0.001, SPF_PASS=-0.001 autolearn=_AUTOLEARN 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: thuth@redhat.com, david@redhat.com, cohuck@redhat.com, pasic@linux.ibm.com, borntraeger@de.ibm.com, mst@redhat.com, svens@linux.ibm.com, pbonzini@redhat.com, mihajlov@linux.ibm.com, rth@twiddle.net 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) --nQR9UOPe9CG83ZJTn7Wmom9HuwFjdi13o Content-Type: multipart/mixed; boundary="JEf48FZ4m5jJbRC7y10A218kaJkk2Jgb6" --JEf48FZ4m5jJbRC7y10A218kaJkk2Jgb6 Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable On 5/16/20 12:20 AM, Collin Walling wrote: > As more features and facilities are added to the Read SCP Info (RSCPI) > response, more space is required to store them. The space used to store= > these new features intrudes on the space originally used to store CPU > entries. This means as more features and facilities are added to the > RSCPI response, less space can be used to store CPU entries. >=20 > With the Extended-Length SCCB (ELS) facility, a KVM guest can execute > the RSCPI command and determine if the SCCB is large enough to store a > complete reponse. If it is not large enough, then the required length > will be set in the SCCB header. >=20 > The caller of the SCLP command is responsible for creating a > large-enough SCCB to store a complete response. Proper checking should > be in place, and the caller should execute the command once-more with > the large-enough SCCB. >=20 > This facility also enables an extended SCCB for the Read CPU Info > (RCPUI) command. >=20 > When this facility is enabled, the boundary violation response cannot > be a result from the RSCPI, RSCPI Forced, or RCPUI commands. >=20 > In order to tolerate kernels that do not yet have full support for this= > feature, a "fixed" offset to the start of the CPU Entries within the > Read SCP Info struct is set to allow for the original 248 max entries > when this feature is disabled. >=20 > Additionally, this is introduced as a CPU feature to protect the guest > from migrating to a machine that does not support storing an extended > SCCB. This could otherwise hinder the VM from being able to read all > available CPU entries after migration (such as during re-ipl). >=20 > Signed-off-by: Collin Walling > --- > hw/s390x/sclp.c | 21 ++++++++++++++++++++- > include/hw/s390x/sclp.h | 1 + > target/s390x/cpu_features_def.inc.h | 1 + > target/s390x/gen-features.c | 1 + > target/s390x/kvm.c | 4 ++++ > 5 files changed, 27 insertions(+), 1 deletion(-) >=20 > diff --git a/hw/s390x/sclp.c b/hw/s390x/sclp.c > index 755f5f3fab..bde4c5420e 100644 > --- a/hw/s390x/sclp.c > +++ b/hw/s390x/sclp.c > @@ -56,6 +56,18 @@ static bool sccb_has_valid_boundary(uint64_t sccb_ad= dr, uint32_t code, > uint64_t allowed_len =3D (sccb_addr & PAGE_MASK) + PAGE_SIZE; > =20 > switch (code & SCLP_CMD_CODE_MASK) { > + case SCLP_CMDW_READ_SCP_INFO: > + case SCLP_CMDW_READ_SCP_INFO_FORCED: > + case SCLP_CMDW_READ_CPU_INFO: > + /* > + * An extended-length SCCB is only allowed for RSCPI and RSCPU= and is > + * allowed to exceed the 4k boundary. The respective commands = will > + * set the length field to the required length if an insuffici= ent > + * SCCB length is provided. > + */ > + if (s390_has_feat(S390_FEAT_EXTENDED_LENGTH_SCCB)) { > + return true; > + } > default: > if (current_len <=3D allowed_len) { > return true; > @@ -72,6 +84,10 @@ static bool sccb_has_sufficient_len(SCCB *sccb, int = num_cpus, int data_len) > =20 > if (be16_to_cpu(sccb->h.length) < required_len) { > sccb->h.response_code =3D cpu_to_be16(SCLP_RC_INSUFFICIENT_SCC= B_LENGTH); > + if (s390_has_feat(S390_FEAT_EXTENDED_LENGTH_SCCB) && > + sccb->h.control_mask[2] & SCLP_VARIABLE_LENGTH_RESPONSE) {= > + sccb->h.length =3D required_len; > + } > return false; > } > return true; > @@ -101,7 +117,9 @@ static void prepare_cpu_entries(MachineState *ms, C= PUEntry *entry, int *count) > */ > static int get_read_scp_info_data_len(void) > { > - return offsetof(ReadInfo, entries); > + return s390_has_feat(S390_FEAT_EXTENDED_LENGTH_SCCB) ? > + offsetof(ReadInfo, entries) : > + SCLP_READ_SCP_INFO_FIXED_CPU_OFFSET; > } > =20 > /* Provide information about the configuration, CPUs and storage */ > @@ -116,6 +134,7 @@ static void read_SCP_info(SCLPDevice *sclp, SCCB *s= ccb) > CPUEntry *entries_start =3D (void *)sccb + data_len; > =20 > if (!sccb_has_sufficient_len(sccb, machine->possible_cpus->len, da= ta_len)) { > + warn_report("insufficient sccb size to store full read scp inf= o response"); > return; > } > =20 > diff --git a/include/hw/s390x/sclp.h b/include/hw/s390x/sclp.h > index 822eff4396..ef2d63eae9 100644 > --- a/include/hw/s390x/sclp.h > +++ b/include/hw/s390x/sclp.h > @@ -110,6 +110,7 @@ typedef struct CPUEntry { > uint8_t reserved1; > } QEMU_PACKED CPUEntry; > =20 > +#define SCLP_READ_SCP_INFO_FIXED_CPU_OFFSET 128 > typedef struct ReadInfo { > SCCBHeader h; > uint16_t rnmax; > diff --git a/target/s390x/cpu_features_def.inc.h b/target/s390x/cpu_fea= tures_def.inc.h > index 60db28351d..3548d65a69 100644 > --- a/target/s390x/cpu_features_def.inc.h > +++ b/target/s390x/cpu_features_def.inc.h > @@ -97,6 +97,7 @@ DEF_FEAT(GUARDED_STORAGE, "gs", STFL, 133, "Guarded-s= torage facility") > DEF_FEAT(VECTOR_PACKED_DECIMAL, "vxpd", STFL, 134, "Vector packed deci= mal facility") > DEF_FEAT(VECTOR_ENH, "vxeh", STFL, 135, "Vector enhancements facility"= ) > DEF_FEAT(MULTIPLE_EPOCH, "mepoch", STFL, 139, "Multiple-epoch facility= ") > +DEF_FEAT(EXTENDED_LENGTH_SCCB, "els", STFL, 140, "Extended-length SCCB= facility") > DEF_FEAT(TEST_PENDING_EXT_INTERRUPTION, "tpei", STFL, 144, "Test-pendi= ng-external-interruption facility") > DEF_FEAT(INSERT_REFERENCE_BITS_MULT, "irbm", STFL, 145, "Insert-refere= nce-bits-multiple facility") > DEF_FEAT(MSA_EXT_8, "msa8-base", STFL, 146, "Message-security-assist-e= xtension-8 facility (excluding subfunctions)") > diff --git a/target/s390x/gen-features.c b/target/s390x/gen-features.c > index 8ddeebc544..6857f657fb 100644 > --- a/target/s390x/gen-features.c > +++ b/target/s390x/gen-features.c > @@ -522,6 +522,7 @@ static uint16_t full_GEN12_GA1[] =3D { > S390_FEAT_AP_QUEUE_INTERRUPT_CONTROL, > S390_FEAT_AP_FACILITIES_TEST, > S390_FEAT_AP, > + S390_FEAT_EXTENDED_LENGTH_SCCB, > }; > =20 > static uint16_t full_GEN12_GA2[] =3D { > diff --git a/target/s390x/kvm.c b/target/s390x/kvm.c > index 69881a0da0..380fb81822 100644 > --- a/target/s390x/kvm.c > +++ b/target/s390x/kvm.c > @@ -2456,6 +2456,10 @@ void kvm_s390_get_host_cpu_model(S390CPUModel *m= odel, Error **errp) > KVM_S390_VM_CRYPTO_ENABLE_APIE)) { > set_bit(S390_FEAT_AP, model->features); > } > + > + /* Extended-Length SCCB is handled entirely within QEMU */ > + set_bit(S390_FEAT_EXTENDED_LENGTH_SCCB, model->features); > + We need to fence this for secure guests as the SIDA is only 4k at the moment. Do we need to take extra steps for migration safety? I guess this is only available with host-passthrough or -model? > /* strip of features that are not part of the maximum model */ > bitmap_and(model->features, model->features, model->def->full_feat= , > S390_FEAT_MAX); >=20 --JEf48FZ4m5jJbRC7y10A218kaJkk2Jgb6-- --nQR9UOPe9CG83ZJTn7Wmom9HuwFjdi13o Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAEBCAAdFiEEwGNS88vfc9+v45Yq41TmuOI4ufgFAl7CTXwACgkQ41TmuOI4 ufjomQ/8C7wBDjrX1B6BMZceAmf2JG2OYt1sXJksV4V7L0Rfy8jEWYj847ctXfSo rzyqU8G2T/GE2rpsU+BaC/BiyhmOtzJHI9Dt6WTCz9z3QDqksNOFwUMi75VDoCSl K9BdBSksEUHzZmUXX0n/dT1o6P52aZ7QBcD38gvDLD1lVdlC4+FVkhMlfvJtUWpS PfB9czaSNyZuP4L3TK78QSVYMGHwtzQUr6pcfEVOvIi/P3zW7a7dGajybhgqcWk6 9vGW4ctOElAx6cBOjB2MAfSQYhtLniOTaMIf7U3j3BjSGnaKXf8DyPcaHgNH7NB0 exMTFiznzynKNpnvxjEs/sep3W9ybSuB6HQ3JMuG6sRpZWLtSmMkRY0T5MRBhWgR kAwjmfyV939VC0tulJH1ugHMyjDU316XeqU/fjdg16ngnCW37DjjKlwdLAF8unhM 5bfOuQ9VNvevrOiLPs8BVK6M8qQbLcnL87MR2kO+N3pMn4ogTCSL0uq0uMV8t5I6 6Ek90iJuMVgkJhmv/FkSwPfppX5c7nputv1A1cfBSZMsC/6LA0U61Ps+zUtla5WT QBHZUaiihLt6rhiEuOjqKTXZy1GLvNuMD7MehxGe8bsWdCYbWtuoUHKQadD6lW+2 36L2cqpWMgPnb+iTdHsO8dZpRuzutEV602JvNx1vy98bj60hECY= =kqio -----END PGP SIGNATURE----- --nQR9UOPe9CG83ZJTn7Wmom9HuwFjdi13o--