xen/dom0: set wallclock time in Xen
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
diff --git a/arch/x86/xen/time.c b/arch/x86/xen/time.c
index 5158c50..8c9cdfa 100644
--- a/arch/x86/xen/time.c
+++ b/arch/x86/xen/time.c
@@ -200,8 +200,22 @@
static int xen_set_wallclock(unsigned long now)
{
+ struct xen_platform_op op;
+ int rc;
+
/* do nothing for domU */
- return -1;
+ if (!xen_initial_domain())
+ return -1;
+
+ op.cmd = XENPF_settime;
+ op.u.settime.secs = now;
+ op.u.settime.nsecs = 0;
+ op.u.settime.system_time = xen_clocksource_read();
+
+ rc = HYPERVISOR_dom0_op(&op);
+ WARN(rc != 0, "XENPF_settime failed: now=%ld\n", now);
+
+ return rc;
}
static struct clocksource xen_clocksource __read_mostly = {
