[Qemu-devel] [PATCH v2] xen: Emit RTC_CHANGE upon TIMEOFFSET ioreq

[Ross Lagerwall <ross.lagerwall@citrix.com>]

When the guest writes to the RTC, Xen emulates it and broadcasts a
TIMEOFFSET ioreq. Emit an RTC_CHANGE QMP event to all QMP monitors when
this happens rather than ignoring it so that something useful can be
done with the information. This is the same event that QEMU generates
when it emulates the RTC.

This patch by itself doesn't affect any of the toolstacks that I
checked; the libxl toolstack doesn't currently handle this event nor
does the XAPI toolstack. If nothing handles the event, it is simply
ignored. We plan on modifying XAPI to handle it.

Signed-off-by: Ross Lagerwall <ross.lagerwall@citrix.com>
---

Changed in v2:
* Expanded commit message.

 hw/i386/xen/xen-hvm.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/hw/i386/xen/xen-hvm.c b/hw/i386/xen/xen-hvm.c
index d9ccd5d..ffd20dc 100644
--- a/hw/i386/xen/xen-hvm.c
+++ b/hw/i386/xen/xen-hvm.c
@@ -16,6 +16,7 @@
 #include "hw/i386/apic-msidef.h"
 #include "hw/xen/xen_common.h"
 #include "hw/xen/xen_backend.h"
+#include "qapi-event.h"
 #include "qmp-commands.h"
 
 #include "qemu/error-report.h"
@@ -967,6 +968,7 @@ static void handle_ioreq(XenIOState *state, ioreq_t *req)
             handle_vmport_ioreq(state, req);
             break;
         case IOREQ_TYPE_TIMEOFFSET:
+            qapi_event_send_rtc_change((int64_t)req->data, &error_abort);
             break;
         case IOREQ_TYPE_INVALIDATE:
             xen_invalidate_map_cache();
-- 
2.9.5