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Fri, 8 May 2020 23:08:44 +0000 (GMT) From: Collin Walling To: qemu-devel@nongnu.org, qemu-s390x@nongnu.org Subject: [PATCH v1 5/8] s390/sclp: use cpu offset to locate cpu entries Date: Fri, 8 May 2020 19:08:20 -0400 Message-Id: <20200508230823.22956-6-walling@linux.ibm.com> X-Mailer: git-send-email 2.21.1 In-Reply-To: <20200508230823.22956-1-walling@linux.ibm.com> References: <20200508230823.22956-1-walling@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.216, 18.0.676 definitions=2020-05-08_19:2020-05-08, 2020-05-08 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxlogscore=999 lowpriorityscore=0 spamscore=0 mlxscore=0 malwarescore=0 clxscore=1015 adultscore=0 phishscore=0 priorityscore=1501 bulkscore=0 impostorscore=0 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2005080190 Received-SPF: pass client-ip=148.163.156.1; envelope-from=walling@linux.ibm.com; helo=mx0a-001b2d01.pphosted.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/05/08 19:08:46 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: frankja@linux.ibm.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+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" The start of the CPU entry region in the Read SCP Info response data is denoted by the offset_cpu field. As such, QEMU needs to begin creating entries at this address. This is in preparation for when Read SCP Info inevitably introduces new bytes that push the start of its CPUEntry field further away. Read CPU Info is unlikely to ever change, so let's not bother accounting for the offset there. Signed-off-by: Collin Walling --- hw/s390x/sclp.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/hw/s390x/sclp.c b/hw/s390x/sclp.c index 748d04a0e2..c47bd3b5ab 100644 --- a/hw/s390x/sclp.c +++ b/hw/s390x/sclp.c @@ -103,15 +103,17 @@ static void read_SCP_info(SCLPDevice *sclp, SCCB *sccb) int cpu_count; int rnsize, rnmax; IplParameterBlock *ipib = s390_ipl_get_iplb(); + int offset_cpu = offsetof(ReadInfo, entries); + CPUEntry *entries_start = (void *)sccb + offset_cpu; if (!check_sufficient_sccb_len(sccb, sizeof(ReadInfo))) { return; } /* CPU information */ - prepare_cpu_entries(read_info->entries, &cpu_count); + prepare_cpu_entries(entries_start, &cpu_count); read_info->entries_cpu = cpu_to_be16(cpu_count); - read_info->offset_cpu = cpu_to_be16(offsetof(ReadInfo, entries)); + read_info->offset_cpu = cpu_to_be16(offset_cpu); read_info->highest_cpu = cpu_to_be16(machine->smp.max_cpus - 1); read_info->ibc_val = cpu_to_be32(s390_get_ibc_val());