hw/xen: Implement EVTCHNOP_reset

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

1 files changed, 30 insertions, 0 deletions

diff --git a/hw/i386/kvm/xen_evtchn.c b/hw/i386/kvm/xen_evtchn.c
index cbaf4f535a..c804a315e0 100644
--- a/hw/i386/kvm/xen_evtchn.c
+++ b/hw/i386/kvm/xen_evtchn.c
@@ -12,6 +12,7 @@
 #include "qemu/osdep.h"
 #include "qemu/host-utils.h"
 #include "qemu/module.h"
+#include "qemu/lockable.h"
 #include "qemu/main-loop.h"
 #include "qemu/log.h"
 #include "qapi/error.h"
@@ -747,6 +748,35 @@ static int close_port(XenEvtchnState *s, evtchn_port_t port)
     return 0;
 }
 
+int xen_evtchn_soft_reset(void)
+{
+    XenEvtchnState *s = xen_evtchn_singleton;
+    int i;
+
+    if (!s) {
+        return -ENOTSUP;
+    }
+
+    assert(qemu_mutex_iothread_locked());
+
+    QEMU_LOCK_GUARD(&s->port_lock);
+
+    for (i = 0; i < s->nr_ports; i++) {
+        close_port(s, i);
+    }
+
+    return 0;
+}
+
+int xen_evtchn_reset_op(struct evtchn_reset *reset)
+{
+    if (reset->dom != DOMID_SELF && reset->dom != xen_domid) {
+        return -ESRCH;
+    }
+
+    return xen_evtchn_soft_reset();
+}
+
 int xen_evtchn_close_op(struct evtchn_close *close)
 {
     XenEvtchnState *s = xen_evtchn_singleton;