KVM: s390: Introduce switching code
This patch adds code that performs transparent switch to Extended SCA on addition of 65th VCPU in a VM. Disposal of ESCA is added too. The entier ESCA functionality, however, is still not enabled. The enablement will be provided in a separate patch. This patch also uses read/write lock protection of SCA and its subfields for possible disposal at the BSCA-to-ESCA transition. While only Basic SCA needs such a protection (for the swap), any SCA access is now guarded. Signed-off-by: NEugene (jno) Dvurechenski <jno@linux.vnet.ibm.com> Signed-off-by: NChristian Borntraeger <borntraeger@de.ibm.com>
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