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s390/sclp: use cpu offset to locate cpu entries 

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 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>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Message-Id: <20200915194416.107460-6-walling@linux.ibm.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
This commit is contained in:
Collin Walling 2020-09-15 15:44:13 -04:00 committed by Cornelia Huck
parent 0260b97824
commit 1a7a568859
1 changed files with 4 additions and 2 deletions
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6
hw/s390x/sclp.c
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@ -89,6 +89,8 @@ static void read_SCP_info(SCLPDevice *sclp, SCCB *sccb)
int rnsize, rnmax;
IplParameterBlock *ipib = s390_ipl_get_iplb();
int required_len = SCCB_REQ_LEN(ReadInfo, machine->possible_cpus->len);
int offset_cpu = offsetof(ReadInfo, entries);
CPUEntry *entries_start = (void *)sccb + offset_cpu;
if (be16_to_cpu(sccb->h.length) < required_len) {
sccb->h.response_code = cpu_to_be16(SCLP_RC_INSUFFICIENT_SCCB_LENGTH);
@ -96,9 +98,9 @@ static void read_SCP_info(SCLPDevice *sclp, SCCB *sccb)
}
/* 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(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());