xen-hvm: Emit RTC_CHANGE upon TIMEOFFSET ioreq

[PATCH] xen-hvm: Emit RTC_CHANGE upon TIMEOFFSET ioreq

Ross Lagerwall posted 1 patch 4 weeks, 1 day ago

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git fetch https://github.com/patchew-project/qemu tags/patchew/20260108135406.1879210-1-ross.lagerwall@citrix.com

Maintainers: Stefano Stabellini <sstabellini@kernel.org>, Anthony PERARD <anthony@xenproject.org>, Paul Durrant <paul@xen.org>, "Edgar E. Iglesias" <edgar.iglesias@gmail.com>

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

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[PATCH] xen-hvm: Emit RTC_CHANGE upon TIMEOFFSET ioreq

Posted by Ross Lagerwall 4 weeks, 1 day ago

When the guest writes to the RTC, the write is intercepted and emulated
by Xen and the time difference is broadcasted as a TIMEOFFSET ioreq.
Emit an RTC_CHANGE QMP event when this happens rather than ignoring it
so that something can make use of the information (e.g. the toolstack
can persist it between VM starts).

Signed-off-by: Ross Lagerwall <ross.lagerwall@citrix.com>
---
 hw/xen/xen-hvm-common.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/hw/xen/xen-hvm-common.c b/hw/xen/xen-hvm-common.c
index 59c73dfaeb59..9b539f5c5c56 100644
--- a/hw/xen/xen-hvm-common.c
+++ b/hw/xen/xen-hvm-common.c
@@ -4,6 +4,7 @@
 #include "qemu/error-report.h"
 #include "qemu/target-info.h"
 #include "qapi/error.h"
+#include "qapi/qapi-events-misc.h"
 #include "exec/target_page.h"
 #include "trace.h"
 
@@ -471,6 +472,7 @@ static void handle_ioreq(XenIOState *state, ioreq_t *req)
             cpu_ioreq_move(req);
             break;
         case IOREQ_TYPE_TIMEOFFSET:
+            qapi_event_send_rtc_change((int64_t)req->data, NULL);
             break;
         case IOREQ_TYPE_INVALIDATE:
             xen_invalidate_map_cache();
-- 
2.52.0