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Wed, 24 Jun 2020 20:23:41 +0000 (GMT) From: Collin Walling To: qemu-devel@nongnu.org, qemu-s390x@nongnu.org Subject: [PATCH v4 5/8] s390/sclp: use cpu offset to locate cpu entries Date: Wed, 24 Jun 2020 16:23:09 -0400 Message-Id: <20200624202312.28349-6-walling@linux.ibm.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200624202312.28349-1-walling@linux.ibm.com> References: <20200624202312.28349-1-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, 18.0.687 definitions=2020-06-24_15:2020-06-24, 2020-06-24 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 cotscore=-2147483648 lowpriorityscore=0 priorityscore=1501 bulkscore=0 mlxlogscore=999 adultscore=0 suspectscore=0 mlxscore=0 malwarescore=0 clxscore=1015 spamscore=0 phishscore=0 impostorscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2004280000 definitions=main-2006240128 Received-SPF: pass client-ip=148.163.158.5; envelope-from=walling@linux.ibm.com; helo=mx0b-001b2d01.pphosted.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/06/24 16:23:44 X-ACL-Warn: Detected OS = Linux 3.x [generic] X-Spam_score_int: -35 X-Spam_score: -3.6 X-Spam_bar: --- X-Spam_report: (-3.6 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-1, SPF_HELO_NONE=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, 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. Note that the length of the Read SCP Info data (data_len) denotes the same value as the cpu offset. This is in preparation of when Read SCP Info inevitably introduces new bytes that push the start of the 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 Reviewed-by: Thomas Huth Reviewed-by: Janosch Frank Reviewed-by: Cornelia Huck --- hw/s390x/sclp.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/hw/s390x/sclp.c b/hw/s390x/sclp.c index 1feba6f692..518f630938 100644 --- a/hw/s390x/sclp.c +++ b/hw/s390x/sclp.c @@ -108,13 +108,14 @@ static void read_SCP_info(SCLPDevice *sclp, SCCB *sccb) int rnsize, rnmax; IplParameterBlock *ipib = s390_ipl_get_iplb(); int offset_cpu = get_read_scp_info_offset_cpu(); + CPUEntry *entries_start = (void *)sccb + offset_cpu; if (!sccb_verify_length(sccb, machine->possible_cpus->len, offset_cpu)) { return; } /* CPU information */ - prepare_cpu_entries(machine, read_info->entries, &cpu_count); + prepare_cpu_entries(machine, entries_start, &cpu_count); read_info->entries_cpu = cpu_to_be16(cpu_count); read_info->offset_cpu = cpu_to_be16(offset_cpu); read_info->highest_cpu = cpu_to_be16(machine->smp.max_cpus - 1);