diff --git a/hw/i386/kvm/xen_evtchn.c b/hw/i386/kvm/xen_evtchn.c
index a731738411..446ae46022 100644
--- a/hw/i386/kvm/xen_evtchn.c
+++ b/hw/i386/kvm/xen_evtchn.c
@@ -58,7 +58,15 @@ OBJECT_DECLARE_SIMPLE_TYPE(XenEvtchnState, XEN_EVTCHN)
 typedef struct XenEvtchnPort {
     uint32_t vcpu;      /* Xen/ACPI vcpu_id */
     uint16_t type;      /* EVTCHNSTAT_xxxx */
-    uint16_t type_val;  /* pirq# / virq# / remote port according to type */
+    union {
+        uint16_t type_val;  /* pirq# / virq# / remote port according to type */
+        uint16_t pirq;
+        uint16_t virq;
+        struct {
+            uint16_t port:15;
+            uint16_t to_qemu:1; /* Only two targets; qemu or loopback */
+        } interdomain;
+    } u;
 } XenEvtchnPort;
 
 /* 32-bit compatibility definitions, also used natively in 32-bit build */
@@ -210,16 +218,16 @@ static int xen_evtchn_post_load(void *opaque, int version_id)
         XenEvtchnPort *p = &s->port_table[i];
 
         if (p->type == EVTCHNSTAT_pirq) {
-            assert(p->type_val);
-            assert(p->type_val < s->nr_pirqs);
+            assert(p->u.pirq);
+            assert(p->u.pirq < s->nr_pirqs);
 
             /*
              * Set the gsi to IRQ_UNBOUND; it may be changed to an actual
              * GSI# below, or to IRQ_MSI_EMU when the MSI table snooping
              * catches up with it.
              */
-            s->pirq[p->type_val].gsi = IRQ_UNBOUND;
-            s->pirq[p->type_val].port = i;
+            s->pirq[p->u.pirq].gsi = IRQ_UNBOUND;
+            s->pirq[p->u.pirq].port = i;
         }
     }
     /* Rebuild s->pirq[].gsi mapping */
@@ -243,7 +251,7 @@ static const VMStateDescription xen_evtchn_port_vmstate = {
     .fields = (VMStateField[]) {
         VMSTATE_UINT32(vcpu, XenEvtchnPort),
         VMSTATE_UINT16(type, XenEvtchnPort),
-        VMSTATE_UINT16(type_val, XenEvtchnPort),
+        VMSTATE_UINT16(u.type_val, XenEvtchnPort),
         VMSTATE_END_OF_LIST()
     }
 };
@@ -599,14 +607,13 @@ static void unbind_backend_ports(XenEvtchnState *s)
 
     for (i = 1; i < s->nr_ports; i++) {
         p = &s->port_table[i];
-        if (p->type == EVTCHNSTAT_interdomain &&
-            (p->type_val & PORT_INFO_TYPEVAL_REMOTE_QEMU)) {
-            evtchn_port_t be_port = p->type_val & PORT_INFO_TYPEVAL_REMOTE_PORT_MASK;
+        if (p->type == EVTCHNSTAT_interdomain && p->u.interdomain.to_qemu) {
+            evtchn_port_t be_port = p->u.interdomain.port;
 
             if (s->be_handles[be_port]) {
                 /* This part will be overwritten on the load anyway. */
                 p->type = EVTCHNSTAT_unbound;
-                p->type_val = PORT_INFO_TYPEVAL_REMOTE_QEMU;
+                p->u.interdomain.port = 0;
 
                 /* Leave the backend port open and unbound too. */
                 if (kvm_xen_has_cap(EVTCHN_SEND)) {
@@ -644,7 +651,7 @@ int xen_evtchn_status_op(struct evtchn_status *status)
 
     switch (p->type) {
     case EVTCHNSTAT_unbound:
-        if (p->type_val & PORT_INFO_TYPEVAL_REMOTE_QEMU) {
+        if (p->u.interdomain.to_qemu) {
             status->u.unbound.dom = DOMID_QEMU;
         } else {
             status->u.unbound.dom = xen_domid;
@@ -652,22 +659,21 @@ int xen_evtchn_status_op(struct evtchn_status *status)
         break;
 
     case EVTCHNSTAT_interdomain:
-        if (p->type_val & PORT_INFO_TYPEVAL_REMOTE_QEMU) {
+        if (p->u.interdomain.to_qemu) {
             status->u.interdomain.dom = DOMID_QEMU;
         } else {
             status->u.interdomain.dom = xen_domid;
         }
 
-        status->u.interdomain.port = p->type_val &
-            PORT_INFO_TYPEVAL_REMOTE_PORT_MASK;
+        status->u.interdomain.port = p->u.interdomain.port;
         break;
 
     case EVTCHNSTAT_pirq:
-        status->u.pirq = p->type_val;
+        status->u.pirq = p->u.pirq;
         break;
 
     case EVTCHNSTAT_virq:
-        status->u.virq = p->type_val;
+        status->u.virq = p->u.virq;
         break;
     }
 
@@ -983,7 +989,7 @@ static int clear_port_pending(XenEvtchnState *s, evtchn_port_t port)
 static void free_port(XenEvtchnState *s, evtchn_port_t port)
 {
     s->port_table[port].type = EVTCHNSTAT_closed;
-    s->port_table[port].type_val = 0;
+    s->port_table[port].u.type_val = 0;
     s->port_table[port].vcpu = 0;
 
     if (s->nr_ports == port + 1) {
@@ -1006,7 +1012,7 @@ static int allocate_port(XenEvtchnState *s, uint32_t vcpu, uint16_t type,
         if (s->port_table[p].type == EVTCHNSTAT_closed) {
             s->port_table[p].vcpu = vcpu;
             s->port_table[p].type = type;
-            s->port_table[p].type_val = val;
+            s->port_table[p].u.type_val = val;
 
             *port = p;
 
@@ -1047,15 +1053,15 @@ static int close_port(XenEvtchnState *s, evtchn_port_t port,
         return -ENOENT;
 
     case EVTCHNSTAT_pirq:
-        s->pirq[p->type_val].port = 0;
-        if (s->pirq[p->type_val].is_translated) {
+        s->pirq[p->u.pirq].port = 0;
+        if (s->pirq[p->u.pirq].is_translated) {
             *flush_kvm_routes = true;
         }
         break;
 
     case EVTCHNSTAT_virq:
-        kvm_xen_set_vcpu_virq(virq_is_global(p->type_val) ? 0 : p->vcpu,
-                              p->type_val, 0);
+        kvm_xen_set_vcpu_virq(virq_is_global(p->u.virq) ? 0 : p->vcpu,
+                              p->u.virq, 0);
         break;
 
     case EVTCHNSTAT_ipi:
@@ -1065,8 +1071,8 @@ static int close_port(XenEvtchnState *s, evtchn_port_t port,
         break;
 
     case EVTCHNSTAT_interdomain:
-        if (p->type_val & PORT_INFO_TYPEVAL_REMOTE_QEMU) {
-            uint16_t be_port = p->type_val & ~PORT_INFO_TYPEVAL_REMOTE_QEMU;
+        if (p->u.interdomain.to_qemu) {
+            uint16_t be_port = p->u.interdomain.port;
             struct xenevtchn_handle *xc = s->be_handles[be_port];
             if (xc) {
                 if (kvm_xen_has_cap(EVTCHN_SEND)) {
@@ -1076,14 +1082,15 @@ static int close_port(XenEvtchnState *s, evtchn_port_t port,
             }
         } else {
             /* Loopback interdomain */
-            XenEvtchnPort *rp = &s->port_table[p->type_val];
-            if (!valid_port(p->type_val) || rp->type_val != port ||
+            XenEvtchnPort *rp = &s->port_table[p->u.interdomain.port];
+            if (!valid_port(p->u.interdomain.port) ||
+                rp->u.interdomain.port != port ||
                 rp->type != EVTCHNSTAT_interdomain) {
                 error_report("Inconsistent state for interdomain unbind");
             } else {
                 /* Set the other end back to unbound */
                 rp->type = EVTCHNSTAT_unbound;
-                rp->type_val = 0;
+                rp->u.interdomain.port = 0;
             }
         }
         break;
@@ -1207,7 +1214,7 @@ int xen_evtchn_bind_vcpu_op(struct evtchn_bind_vcpu *vcpu)
     if (p->type == EVTCHNSTAT_interdomain ||
         p->type == EVTCHNSTAT_unbound ||
         p->type == EVTCHNSTAT_pirq ||
-        (p->type == EVTCHNSTAT_virq && virq_is_global(p->type_val))) {
+        (p->type == EVTCHNSTAT_virq && virq_is_global(p->u.virq))) {
         /*
          * unmask_port() with do_unmask==false will just raise the event
          * on the new vCPU if the port was already pending.
@@ -1352,19 +1359,15 @@ int xen_evtchn_bind_ipi_op(struct evtchn_bind_ipi *ipi)
 int xen_evtchn_bind_interdomain_op(struct evtchn_bind_interdomain *interdomain)
 {
     XenEvtchnState *s = xen_evtchn_singleton;
-    uint16_t type_val;
     int ret;
 
     if (!s) {
         return -ENOTSUP;
     }
 
-    if (interdomain->remote_dom == DOMID_QEMU) {
-        type_val = PORT_INFO_TYPEVAL_REMOTE_QEMU;
-    } else if (interdomain->remote_dom == DOMID_SELF ||
-               interdomain->remote_dom == xen_domid) {
-        type_val = 0;
-    } else {
+    if (interdomain->remote_dom != DOMID_QEMU &&
+        interdomain->remote_dom != DOMID_SELF &&
+        interdomain->remote_dom != xen_domid) {
         return -ESRCH;
     }
 
@@ -1375,8 +1378,8 @@ int xen_evtchn_bind_interdomain_op(struct evtchn_bind_interdomain *interdomain)
     qemu_mutex_lock(&s->port_lock);
 
     /* The newly allocated port starts out as unbound */
-    ret = allocate_port(s, 0, EVTCHNSTAT_unbound, type_val,
-                        &interdomain->local_port);
+    ret = allocate_port(s, 0, EVTCHNSTAT_unbound, 0, &interdomain->local_port);
+
     if (ret) {
         goto out;
     }
@@ -1401,7 +1404,8 @@ int xen_evtchn_bind_interdomain_op(struct evtchn_bind_interdomain *interdomain)
             assign_kernel_eventfd(lp->type, xc->guest_port, xc->fd);
         }
         lp->type = EVTCHNSTAT_interdomain;
-        lp->type_val = PORT_INFO_TYPEVAL_REMOTE_QEMU | interdomain->remote_port;
+        lp->u.interdomain.to_qemu = 1;
+        lp->u.interdomain.port = interdomain->remote_port;
         ret = 0;
     } else {
         /* Loopback */
@@ -1415,13 +1419,13 @@ int xen_evtchn_bind_interdomain_op(struct evtchn_bind_interdomain *interdomain)
          * the port that was just allocated for the local end.
          */
         if (interdomain->local_port != interdomain->remote_port &&
-            rp->type == EVTCHNSTAT_unbound && rp->type_val == 0) {
+            rp->type == EVTCHNSTAT_unbound && !rp->u.interdomain.to_qemu) {
 
             rp->type = EVTCHNSTAT_interdomain;
-            rp->type_val = interdomain->local_port;
+            rp->u.interdomain.port = interdomain->local_port;
 
             lp->type = EVTCHNSTAT_interdomain;
-            lp->type_val = interdomain->remote_port;
+            lp->u.interdomain.port = interdomain->remote_port;
         } else {
             ret = -EINVAL;
         }
@@ -1440,7 +1444,6 @@ int xen_evtchn_bind_interdomain_op(struct evtchn_bind_interdomain *interdomain)
 int xen_evtchn_alloc_unbound_op(struct evtchn_alloc_unbound *alloc)
 {
     XenEvtchnState *s = xen_evtchn_singleton;
-    uint16_t type_val;
     int ret;
 
     if (!s) {
@@ -1451,18 +1454,19 @@ int xen_evtchn_alloc_unbound_op(struct evtchn_alloc_unbound *alloc)
         return -ESRCH;
     }
 
-    if (alloc->remote_dom == DOMID_QEMU) {
-        type_val = PORT_INFO_TYPEVAL_REMOTE_QEMU;
-    } else if (alloc->remote_dom == DOMID_SELF ||
-               alloc->remote_dom == xen_domid) {
-        type_val = 0;
-    } else {
+    if (alloc->remote_dom != DOMID_QEMU && alloc->remote_dom != DOMID_SELF &&
+        alloc->remote_dom != xen_domid) {
         return -EPERM;
     }
 
     qemu_mutex_lock(&s->port_lock);
 
-    ret = allocate_port(s, 0, EVTCHNSTAT_unbound, type_val, &alloc->port);
+    ret = allocate_port(s, 0, EVTCHNSTAT_unbound, 0, &alloc->port);
+
+    if (!ret && alloc->remote_dom == DOMID_QEMU) {
+        XenEvtchnPort *p = &s->port_table[alloc->port];
+        p->u.interdomain.to_qemu = 1;
+    }
 
     qemu_mutex_unlock(&s->port_lock);
 
@@ -1489,12 +1493,12 @@ int xen_evtchn_send_op(struct evtchn_send *send)
 
     switch (p->type) {
     case EVTCHNSTAT_interdomain:
-        if (p->type_val & PORT_INFO_TYPEVAL_REMOTE_QEMU) {
+        if (p->u.interdomain.to_qemu) {
             /*
              * This is an event from the guest to qemu itself, which is
              * serving as the driver domain.
              */
-            uint16_t be_port = p->type_val & ~PORT_INFO_TYPEVAL_REMOTE_QEMU;
+            uint16_t be_port = p->u.interdomain.port;
             struct xenevtchn_handle *xc = s->be_handles[be_port];
             if (xc) {
                 eventfd_write(xc->fd, 1);
@@ -1504,7 +1508,7 @@ int xen_evtchn_send_op(struct evtchn_send *send)
             }
         } else {
             /* Loopback interdomain ports; just a complex IPI */
-            set_port_pending(s, p->type_val);
+            set_port_pending(s, p->u.interdomain.port);
         }
         break;
 
@@ -1546,8 +1550,7 @@ int xen_evtchn_set_port(uint16_t port)
 
     /* QEMU has no business sending to anything but these */
     if (p->type == EVTCHNSTAT_virq ||
-        (p->type == EVTCHNSTAT_interdomain &&
-         (p->type_val & PORT_INFO_TYPEVAL_REMOTE_QEMU))) {
+        (p->type == EVTCHNSTAT_interdomain && p->u.interdomain.to_qemu)) {
         set_port_pending(s, port);
         ret = 0;
     }
@@ -2057,7 +2060,7 @@ int xen_be_evtchn_bind_interdomain(struct xenevtchn_handle *xc, uint32_t domid,
     switch (gp->type) {
     case EVTCHNSTAT_interdomain:
         /* Allow rebinding after migration, preserve port # if possible */
-        be_port = gp->type_val & ~PORT_INFO_TYPEVAL_REMOTE_QEMU;
+        be_port = gp->u.interdomain.port;
         assert(be_port != 0);
         if (!s->be_handles[be_port]) {
             s->be_handles[be_port] = xc;
@@ -2078,7 +2081,8 @@ int xen_be_evtchn_bind_interdomain(struct xenevtchn_handle *xc, uint32_t domid,
         }
 
         gp->type = EVTCHNSTAT_interdomain;
-        gp->type_val = be_port | PORT_INFO_TYPEVAL_REMOTE_QEMU;
+        gp->u.interdomain.to_qemu = 1;
+        gp->u.interdomain.port = be_port;
         xc->guest_port = guest_port;
         if (kvm_xen_has_cap(EVTCHN_SEND)) {
             assign_kernel_eventfd(gp->type, guest_port, xc->fd);
@@ -2123,7 +2127,7 @@ int xen_be_evtchn_unbind(struct xenevtchn_handle *xc, evtchn_port_t port)
         /* This should never *not* be true */
         if (gp->type == EVTCHNSTAT_interdomain) {
             gp->type = EVTCHNSTAT_unbound;
-            gp->type_val = PORT_INFO_TYPEVAL_REMOTE_QEMU;
+            gp->u.interdomain.port = 0;
         }
 
         if (kvm_xen_has_cap(EVTCHN_SEND)) {
@@ -2277,11 +2281,11 @@ EvtchnInfoList *qmp_xen_event_list(Error **errp)
 
         info->type = p->type;
         if (p->type == EVTCHNSTAT_interdomain) {
-            info->remote_domain = g_strdup((p->type_val & PORT_INFO_TYPEVAL_REMOTE_QEMU) ?
+            info->remote_domain = g_strdup(p->u.interdomain.to_qemu ?
                                            "qemu" : "loopback");
-            info->target = p->type_val & PORT_INFO_TYPEVAL_REMOTE_PORT_MASK;
+            info->target = p->u.interdomain.port;
         } else {
-            info->target = p->type_val;
+            info->target = p->u.type_val; /* pirq# or virq# */
         }
         info->vcpu = p->vcpu;
         info->pending = test_bit(i, pending);
