Signed-off-by: Lei Li <li...@linux.vnet.ibm.com>
---
qga/commands-posix.c | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++++
qga/qapi-schema.json | 27 ++++++++++++++++++++++++++
2 files changed, 81 insertions(+)
diff --git a/qga/commands-posix.c b/qga/commands-posix.c
index 6fc6003..0515f5f 100644
--- a/qga/commands-posix.c
+++ b/qga/commands-posix.c
@@ -135,6 +135,60 @@ int64_t qmp_guest_get_time(Error **errp)
return time_ns;
}
+void qmp_guest_set_time(int64_t time_ns, Error **errp)
+{
+ int ret;
+ int status;
+ pid_t pid;
+ Error *local_err = NULL;
+ struct timeval tv;
+
+ /* year-2038 will overflow in case time_t is 32bit */
+ if (time_ns / 1000000000 != (time_t)(time_ns / 1000000000)) {
+ error_setg(errp, "Time %" PRId64 " is too large", time_ns);
+ }
+
+ tv.tv_sec = time_ns / 1000000000;
+ tv.tv_usec = (time_ns % 1000000000) / 1000;
+
+ ret = settimeofday(&tv, NULL);
+ if (ret < 0) {
+ error_setg_errno(errp, errno, "Failed to set time to guest");
+ return;
+ }
+
+ /* Set the Hardware Clock to the current System Time. */
+ pid = fork();
+ if (pid == 0) {
+ setsid();
+ reopen_fd_to_null(0);
+ reopen_fd_to_null(1);
+ reopen_fd_to_null(2);
+
+ execle("/sbin/hwclock", "hwclock", "-w", NULL, environ);
+ _exit(EXIT_FAILURE);
+ } else if (pid < 0) {
+ error_setg_errno(errp, errno, "failed to create child process");
+ return;
+ }
+
+ ga_wait_child(pid, &status, &local_err);
+ if (error_is_set(&local_err)) {
+ error_propagate(errp, local_err);
+ return;
+ }
+
+ if (!WIFEXITED(status)) {
+ error_setg(errp, "child process has terminated abnormally");
+ return;
+ }
+
+ if (WEXITSTATUS(status)) {
+ error_setg(errp, "hwclock failed to set hardware clock to system
time");
+ return;
+ }
+}
+
typedef struct GuestFileHandle {
uint64_t id;
FILE *fh;
diff --git a/qga/qapi-schema.json b/qga/qapi-schema.json
index 52bb091..ce964e9 100644
--- a/qga/qapi-schema.json
+++ b/qga/qapi-schema.json
@@ -96,6 +96,33 @@
'returns': 'int' }
##
+# @guest-set-time:
+#
+# Set guest time.
+#
+# When a guest is paused or migrated to a file then loaded
+# from that file, the guest OS has no idea that there
+# was a big gap in the time. Depending on how long the
+# gap was, NTP might not be able to resynchronize the
+# guest.
+#
+# This command tries to set guest time based on the information
+# from host or an absolute value given by management app, and
+# set the Hardware Clock to the current System Time. This
+# will make it easier for a guest to resynchronize without
+# waiting for NTP.
+#
+# @time: time of nanoseconds, relative to the Epoch of
+# 1970-01-01 in UTC.
+#
+# Returns: Nothing on success.
+#
+# Since: 1.5
+##
+{ 'command': 'guest-set-time',
+ 'data': { 'time': 'int' } }
+
+##
# @GuestAgentCommandInfo:
#
# Information about guest agent commands.
--
1.7.11.7
