i386/xen: handle PV timer hypercalls

Introduce support for one shot and periodic mode of Xen PV timers,
whereby timer interrupts come through a special virq event channel
with deadlines being set through:

1) set_timer_op hypercall (only oneshot)
2) vcpu_op hypercall for {set,stop}_{singleshot,periodic}_timer
hypercalls

Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Reviewed-by: Paul Durrant <paul@xen.org>

2 files changed, 33 insertions, 0 deletions

diff --git a/hw/i386/kvm/xen_evtchn.c b/hw/i386/kvm/xen_evtchn.c
index f39b751ff9..71ed480189 100644
--- a/hw/i386/kvm/xen_evtchn.c
+++ b/hw/i386/kvm/xen_evtchn.c
@@ -1222,6 +1222,37 @@ int xen_evtchn_send_op(struct evtchn_send *send)
     return ret;
 }
 
+int xen_evtchn_set_port(uint16_t port)
+{
+    XenEvtchnState *s = xen_evtchn_singleton;
+    XenEvtchnPort *p;
+    int ret = -EINVAL;
+
+    if (!s) {
+        return -ENOTSUP;
+    }
+
+    if (!valid_port(port)) {
+        return -EINVAL;
+    }
+
+    qemu_mutex_lock(&s->port_lock);
+
+    p = &s->port_table[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))) {
+        set_port_pending(s, port);
+        ret = 0;
+    }
+
+    qemu_mutex_unlock(&s->port_lock);
+
+    return ret;
+}
+
 EvtchnInfoList *qmp_xen_event_list(Error **errp)
 {
     XenEvtchnState *s = xen_evtchn_singleton;
diff --git a/hw/i386/kvm/xen_evtchn.h b/hw/i386/kvm/xen_evtchn.h
index b03c3108bc..24611478b8 100644
--- a/hw/i386/kvm/xen_evtchn.h
+++ b/hw/i386/kvm/xen_evtchn.h
@@ -20,6 +20,8 @@ int xen_evtchn_set_callback_param(uint64_t param);
 void xen_evtchn_connect_gsis(qemu_irq *system_gsis);
 void xen_evtchn_set_callback_level(int level);
 
+int xen_evtchn_set_port(uint16_t port);
+
 struct evtchn_status;
 struct evtchn_close;
 struct evtchn_unmask;