[PATCH v3 5/8] s390/sclp: use cpu offset to locate cpu entries

[Collin Walling]

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 <walling@linux.ibm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
---
 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 772b7b3b01..0dfbe6e5ec 100644
--- a/hw/s390x/sclp.c
+++ b/hw/s390x/sclp.c
@@ -113,13 +113,14 @@ static void read_SCP_info(SCLPDevice *sclp, SCCB *sccb)
     int rnsize, rnmax;
     IplParameterBlock *ipib = s390_ipl_get_iplb();
     int data_len = get_read_scp_info_data_len();
+    CPUEntry *entries_start = (void *)sccb + data_len;
 
     if (!sccb_sufficient_len(sccb, machine->possible_cpus->len, data_len)) {
         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(data_len);
     read_info->highest_cpu = cpu_to_be16(machine->smp.max_cpus - 1);
-- 
2.21.3