[libvirt] [PATCH 06/11] Make QEMU perform managed save of all VMs on stop of libvirtd
From: "Daniel P. Berrange" <berrange(a)redhat.com>
When the virStateStop() method is invoked, perform a managed
save of all VMs currently running
Signed-off-by: Daniel P. Berrange <berrange(a)redhat.com>
---
src/qemu/qemu_driver.c | 69 ++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 69 insertions(+)
diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 229d5ae..3690c40 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -970,6 +970,74 @@ qemuActive(void) {
return active;
}
+
+/*
+ * qemuStop:
+ *
+ * Save any VMs in preparation for shutdown
+ *
+ */
+static int
+qemuStop(void) {
+ int ret = -1;
+ const char *uri;
+ virConnectPtr conn;
+ int numDomains;
+ size_t i;
+ int state;
+ virDomainPtr *domains = NULL;
+ unsigned int *flags = NULL;
+
+ qemuDriverLock(qemu_driver);
+ uri = qemu_driver->privileged ?
+ "qemu:///system" :
+ "qemu:///session";
+ qemuDriverUnlock(qemu_driver);
+
+ if (!(conn = virConnectOpen(uri)))
+ return -1;
+
+ if ((numDomains = virConnectListAllDomains(conn,
+ &domains,
+ VIR_CONNECT_LIST_DOMAINS_ACTIVE)) < 0)
+ goto cleanup;
+
+ if (VIR_ALLOC_N(flags, numDomains) < 0) {
+ virReportOOMError();
+ goto cleanup;
+ }
+
+ /* First we pause all VMs to make them stop dirtying
+ pages, etc. We remember if any VMs were paused so
+ we can restore that on resume. */
+ for (i = 0 ; i < numDomains ; i++) {
+ flags[i] = VIR_DOMAIN_SAVE_RUNNING;
+ if (virDomainGetState(domains[i], &state, NULL, 0) == 0) {
+ if (state == VIR_DOMAIN_PAUSED) {
+ flags[i] = VIR_DOMAIN_SAVE_PAUSED;
+ }
+ }
+ virDomainSuspend(domains[i]);
+ }
+
+ /* Then we save the VMs to disk */
+ for (i = 0 ; i < numDomains ; i++)
+ if (virDomainManagedSave(domains[i], flags[i]) < 0)
+ ret = -1;
+
+ VIR_FREE(domains);
+ VIR_FREE(flags);
+
+ ret = 0;
+ cleanup:
+ for (i = 0 ; i < numDomains ; i++)
+ virDomainFree(domains[i]);
+ VIR_FREE(domains);
+ VIR_FREE(flags);
+
+ return ret;
+}
+
/**
* qemuShutdown:
*
@@ -14613,6 +14681,7 @@ static virStateDriver qemuStateDriver = {
.cleanup = qemuShutdown,
.reload = qemuReload,
.active = qemuActive,
+ .stop = qemuStop,
};
int qemuRegister(void) {
--
1.7.12.1