[libvirt] [PATCH] qemu driver: sync guest time via qemu-guest-agent when domain is resumed
Since QEMU commit "kvmclock: clock should count only if vm is running"
(http://lists.gnu.org/archive/html/qemu-devel/2013-06/msg01225.html),
guests have their realtime clock stopped during pause.
To correct the situation, invoke guest agent to sync time from
host time.
Signed-off-by: Marcelo Tosatti <mtosatti(a)redhat.com>
diff --git a/src/qemu/qemu_process.c b/src/qemu/qemu_process.c
index 8bcd98e..df01244 100644
--- a/src/qemu/qemu_process.c
+++ b/src/qemu/qemu_process.c
@@ -2695,6 +2695,40 @@ qemuProcessPrepareMonitorChr(virQEMUDriverConfigPtr cfg,
}
+
+#include <sys/time.h>
+
+static void
+qemuAgentSyncGuestTime(virDomainObjPtr vm)
+{
+ int ret;
+ struct timeval tv;
+ char *result;
+ qemuDomainObjPrivatePtr priv;
+ char buf[500];
+
+ priv = vm->privateData;
+
+ ret = gettimeofday(&tv, NULL);
+ if (ret) {
+ virReportSystemError(errno, "%s", _("gettimeofday
failure"));
+ return;
+ }
+
+ memset(buf, 0, sizeof(buf));
+
+ sprintf(buf, "{ \"execute\": \"guest-set-time\","
+ "\"arguments\":{\"time\":%lld}}\"
",
+ tv.tv_usec * 1000 + (tv.tv_sec * 1000000000LL));
+
+ qemuDomainObjEnterAgent(vm);
+ ret = qemuAgentArbitraryCommand(priv->agent, buf, &result,
+ VIR_DOMAIN_QEMU_AGENT_COMMAND_DEFAULT);
+ qemuDomainObjExitAgent(vm);
+ if (ret < 0)
+ VIR_FREE(result);
+}
+
/*
* Precondition: vm must be locked, and a job must be active.
* This method will call {Enter,Exit}Monitor
@@ -2727,6 +2761,7 @@ qemuProcessStartCPUs(virQEMUDriverPtr driver, virDomainObjPtr vm,
if (ret == 0) {
virDomainObjSetState(vm, VIR_DOMAIN_RUNNING, reason);
+ qemuAgentSyncGuestTime(vm);
} else {
if (virDomainLockProcessPause(driver->lockManager, vm,
&priv->lockState) < 0)
VIR_WARN("Unable to release lease on %s", vm->def->name);