[S390] kvm: make sigp emerg smp capable

SIGP emerg needs to pass the source vpu adress into __LC_CPU_ADDRESS of the
target guest.

Signed-off-by: Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

arch/s390/include/asm/kvm_host.h

@@ -174,6 +174,10 @@ struct kvm_s390_prefix_info {
 	__u32 address;
 };
 
+struct kvm_s390_emerg_info {
+	__u16 code;
+};
+
 struct kvm_s390_interrupt_info {
 	struct list_head list;
 	u64	type;
@@ -181,6 +185,7 @@ struct kvm_s390_interrupt_info {
 		struct kvm_s390_io_info io;
 		struct kvm_s390_ext_info ext;
 		struct kvm_s390_pgm_info pgm;
+		struct kvm_s390_emerg_info emerg;
 		struct kvm_s390_prefix_info prefix;
 	};
 };

arch/s390/kvm/interrupt.c

@@ -128,6 +128,10 @@ static void __do_deliver_interrupt(struct kvm_vcpu *vcpu,
 		if (rc == -EFAULT)
 			exception = 1;
 
+		rc = put_guest_u16(vcpu, __LC_CPU_ADDRESS, inti->emerg.code);
+		if (rc == -EFAULT)
+			exception = 1;
+
 		rc = copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
 			 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 		if (rc == -EFAULT)