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-rw-r--r--arch/s390/kvm/sigp.c35
1 files changed, 35 insertions, 0 deletions
diff --git a/arch/s390/kvm/sigp.c b/arch/s390/kvm/sigp.c
index c0b99e0f6b63..d0341d2e54b1 100644
--- a/arch/s390/kvm/sigp.c
+++ b/arch/s390/kvm/sigp.c
@@ -458,3 +458,38 @@ int kvm_s390_handle_sigp(struct kvm_vcpu *vcpu)
kvm_s390_set_psw_cc(vcpu, rc);
return 0;
}
+
+/*
+ * Handle SIGP partial execution interception.
+ *
+ * This interception will occur at the source cpu when a source cpu sends an
+ * external call to a target cpu and the target cpu has the WAIT bit set in
+ * its cpuflags. Interception will occurr after the interrupt indicator bits at
+ * the target cpu have been set. All error cases will lead to instruction
+ * interception, therefore nothing is to be checked or prepared.
+ */
+int kvm_s390_handle_sigp_pei(struct kvm_vcpu *vcpu)
+{
+ int r3 = vcpu->arch.sie_block->ipa & 0x000f;
+ u16 cpu_addr = vcpu->run->s.regs.gprs[r3];
+ struct kvm_vcpu *dest_vcpu;
+ u8 order_code = kvm_s390_get_base_disp_rs(vcpu);
+
+ trace_kvm_s390_handle_sigp_pei(vcpu, order_code, cpu_addr);
+
+ if (order_code == SIGP_EXTERNAL_CALL) {
+ dest_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_addr);
+ BUG_ON(dest_vcpu == NULL);
+
+ spin_lock_bh(&dest_vcpu->arch.local_int.lock);
+ if (waitqueue_active(&dest_vcpu->wq))
+ wake_up_interruptible(&dest_vcpu->wq);
+ dest_vcpu->preempted = true;
+ spin_unlock_bh(&dest_vcpu->arch.local_int.lock);
+
+ kvm_s390_set_psw_cc(vcpu, SIGP_CC_ORDER_CODE_ACCEPTED);
+ return 0;
+ }
+
+ return -EOPNOTSUPP;
+}