hw/xen: Implement EVTCHNOP_alloc_unbound

Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Reviewed-by: Paul Durrant <paul@xen.org>

1 files changed, 32 insertions, 0 deletions

diff --git a/hw/i386/kvm/xen_evtchn.c b/hw/i386/kvm/xen_evtchn.c
index ce7a969234..df25bf0806 100644
--- a/hw/i386/kvm/xen_evtchn.c
+++ b/hw/i386/kvm/xen_evtchn.c
@@ -837,6 +837,38 @@ int xen_evtchn_bind_ipi_op(struct evtchn_bind_ipi *ipi)
     return ret;
 }
 
+int xen_evtchn_alloc_unbound_op(struct evtchn_alloc_unbound *alloc)
+{
+    XenEvtchnState *s = xen_evtchn_singleton;
+    uint16_t type_val;
+    int ret;
+
+    if (!s) {
+        return -ENOTSUP;
+    }
+
+    if (alloc->dom != DOMID_SELF && alloc->dom != xen_domid) {
+        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 {
+        return -EPERM;
+    }
+
+    qemu_mutex_lock(&s->port_lock);
+
+    ret = allocate_port(s, 0, EVTCHNSTAT_unbound, type_val, &alloc->port);
+
+    qemu_mutex_unlock(&s->port_lock);
+
+    return ret;
+}
+
 int xen_evtchn_send_op(struct evtchn_send *send)
 {
     XenEvtchnState *s = xen_evtchn_singleton;