s390/dump_stack: use control program identification string
If running within a level 3 hypervisor, the hypervisor provides a SYSIB block which contains a control program indentifier string. Use this string instead of the simple KVM and z/VM strings only. In case of z/VM this provides addtional information: the z/VM version. The new string looks similar to this: Hardware name: IBM 2964 N96 702 (z/VM 6.4.0) Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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