s390/protvirt: Add sysfs firmware interface for Ultravisor information
That information, e.g. the maximum number of guests or installed Ultravisor facilities, is interesting for QEMU, Libvirt and administrators. Let's provide an easily parsable API to get that information. Signed-off-by: Janosch Frank <frankja@linux.ibm.com> Reviewed-by: Cornelia Huck <cohuck@redhat.com> Reviewed-by: David Hildenbrand <david@redhat.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
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