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Implement sigp external call, which might be required for guests that issue an external call instead of an emergency signal for IPI. This fixes an issue with "KVM: unknown SIGP: 0x02" when booting such an SMP guest. Signed-off-by: Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>