[Xen-devel] [PATCH 3/3] xen/dom0: set wallclock time in Xen

[Jeremy Fitzhardinge <jeremy@xxxxxxxx>]

From: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>
---
 arch/x86/xen/time.c |   16 +++++++++++++++-
 1 files changed, 15 insertions(+), 1 deletions(-)

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 unsigned long xen_get_wallclock(void)
 
 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 = {
-- 
1.7.6.2


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