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Some updates to the control blocks need to be done in a way that ensures that no CPU is within SIE. Provide wrappers around the s390_vcpu_block functions and adopt the TOD migration code to update in a guaranteed fashion. Also rename these functions to have the kvm_s390_ prefix as everything else. Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>