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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Thu, 12 Mar 2020 08:33:46 -0000 Received: from d06av21.portsmouth.uk.ibm.com (d06av21.portsmouth.uk.ibm.com [9.149.105.232]) by b06avi18878370.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 02C8XjRW38601084 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 12 Mar 2020 08:33:45 GMT Received: from d06av21.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 38FBC52051; Thu, 12 Mar 2020 08:33:45 +0000 (GMT) Received: from oc7455500831.ibm.com (unknown [9.152.224.141]) by d06av21.portsmouth.uk.ibm.com (Postfix) with ESMTP id EF6955204F; Thu, 12 Mar 2020 08:33:44 +0000 (GMT) Subject: Re: [PATCH v9 02/15] s390x: protvirt: Support unpack facility To: Janosch Frank , qemu-devel@nongnu.org References: <20200311132151.172389-1-frankja@linux.ibm.com> <20200311132151.172389-3-frankja@linux.ibm.com> From: Christian Borntraeger Autocrypt: addr=borntraeger@de.ibm.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.5.0 MIME-Version: 1.0 In-Reply-To: <20200311132151.172389-3-frankja@linux.ibm.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 x-cbid: 20031208-4275-0000-0000-000003AB0B0B X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 20031208-4276-0000-0000-000038C02904 Message-Id: X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.138, 18.0.572 definitions=2020-03-12_01:2020-03-11, 2020-03-12 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 bulkscore=0 adultscore=0 mlxlogscore=999 mlxscore=0 spamscore=0 suspectscore=0 impostorscore=0 clxscore=1015 malwarescore=0 phishscore=0 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2001150001 definitions=main-2003120045 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: qemu-s390x@nongnu.org, cohuck@redhat.com, david@redhat.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 11.03.20 14:21, Janosch Frank wrote: [...] > diff --git a/hw/s390x/ipl.c b/hw/s390x/ipl.c > index b81942e1e6f9002e..98df89e62c25f583 100644 > --- a/hw/s390x/ipl.c > +++ b/hw/s390x/ipl.c > @@ -27,6 +27,7 @@ > #include "hw/s390x/vfio-ccw.h" > #include "hw/s390x/css.h" > #include "hw/s390x/ebcdic.h" > +#include "hw/s390x/pv.h" > #include "ipl.h" > #include "qemu/error-report.h" > #include "qemu/config-file.h" > @@ -566,12 +567,31 @@ void s390_ipl_update_diag308(IplParameterBlock *iplb) > { > S390IPLState *ipl = get_ipl_device(); > > - ipl->iplb = *iplb; > - ipl->iplb_valid = true; > + /* > + * The IPLB set and retrieved by subcodes 8/9 is completely > + * separate from the one managed via subcodes 5/6. > + */ > + if (iplb->pbt == S390_IPL_TYPE_PV) { > + ipl->iplb_pv = *iplb; > + ipl->iplb_valid_pv = true; > + } else { > + ipl->iplb = *iplb; > + ipl->iplb_valid = true; > + } We call this for DIAG308_SET and DIAG308_PV_SET in diag.c (see below). Doesnt this allow to set S390_IPL_TYPE_PV via subcode 5 and an CCW type via subcode 8. It is certainly not an issue security-wise, but it seems to violate the architecture. Shouldnt we add a check in diag.c? [...] > diff --git a/target/s390x/diag.c b/target/s390x/diag.c [..] > @@ -93,6 +102,11 @@ void handle_diag_308(CPUS390XState *env, uint64_t r1, uint64_t r3, uintptr_t ra) > return; > } > > + if (subcode >= DIAG308_PV_SET && !s390_has_feat(S390_FEAT_UNPACK)) { > + s390_program_interrupt(env, PGM_SPECIFICATION, ra); > + return; > + } > + > switch (subcode) { > case DIAG308_RESET_MOD_CLR: > s390_ipl_reset_request(cs, S390_RESET_MODIFIED_CLEAR); > @@ -105,6 +119,7 @@ void handle_diag_308(CPUS390XState *env, uint64_t r1, uint64_t r3, uintptr_t ra) > s390_ipl_reset_request(cs, S390_RESET_REIPL); > break; > case DIAG308_SET: > + case DIAG308_PV_SET: somewhere here after we have loaded the block. Other than that this looks good.