[Qemu-devel] [PATCH 2/2] qga: add windows implementation for guest-set-time

[Lei Li <lilei@linux.vnet.ibm.com>]

Signed-off-by: Lei Li <lilei@linux.vnet.ibm.com>
---
 qga/commands-win32.c | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/qga/commands-win32.c b/qga/commands-win32.c
index e24fb4a..8064c3a 100644
--- a/qga/commands-win32.c
+++ b/qga/commands-win32.c
@@ -141,6 +141,39 @@ out:
     return -1;
 }
 
+void qmp_guest_set_time(int64_t time_ns, Error **errp)
+{
+    SYSTEMTIME ts;
+    FILETIME tf;
+    LONGLONG time;
+
+    if (time_ns < 0 || time_ns / 100 > INT64_MAX - W32_FT_OFFSET) {
+        error_setg(errp, "Time %" PRId64 "is invalid", time_ns);
+        return;
+    }
+
+    time = time_ns / 100 + W32_FT_OFFSET;
+
+    tf.dwLowDateTime = (DWORD) time;
+    tf.dwHighDateTime = (DWORD) (time >> 32);
+
+    if (!FileTimeToSystemTime(&tf, &ts)) {
+        error_setg(errp, "Failed to convert system time");
+        return;
+    }
+
+    acquire_privilege(SE_SYSTEMTIME_NAME, errp);
+    if (error_is_set(errp)) {
+        error_setg(errp, "Failed to acquire privilege");
+        return;
+    }
+
+    if (!SetSystemTime(&ts)) {
+        error_setg(errp, "Failed to set time to guest: %d", (int)GetLastError());
+        return;
+    }
+}
+
 int64_t qmp_guest_file_open(const char *path, bool has_mode, const char *mode, Error **err)
 {
     error_set(err, QERR_UNSUPPORTED);
-- 
1.7.11.7