[libvirt] [PATCH] qemu: Refresh state before starting the VCPUs

[Marc Hartmayer]

For normal starts (no incoming migration) the refresh of the QEMU
state must be done before the VCPUs getting started since otherwise
there might be a race condition between a possible shutdown of the
guest OS and the QEMU monitor queries.

This fixes "qemu: migration: Refresh device information after
transferring state" (93db7eea1b864).

Signed-off-by: Marc Hartmayer <mhartmay at linux.ibm.com>
---
 src/qemu/qemu_process.c | 20 +++++++++++---------
 1 file changed, 11 insertions(+), 9 deletions(-)

diff --git a/src/qemu/qemu_process.c b/src/qemu/qemu_process.c
index dace5aaca102..2a3763f40d49 100644
--- a/src/qemu/qemu_process.c
+++ b/src/qemu/qemu_process.c
@@ -6929,10 +6929,17 @@ qemuProcessStart(virConnectPtr conn,
     }
     relabel = true;
 
-    if (incoming &&
-        incoming->deferredURI &&
-        qemuMigrationDstRun(driver, vm, incoming->deferredURI, asyncJob) < 0)
-        goto stop;
+    if (incoming) {
+        if (incoming->deferredURI &&
+            qemuMigrationDstRun(driver, vm, incoming->deferredURI, asyncJob) < 0)
+            goto stop;
+    } else {
+        /* Refresh state of devices from QEMU. During migration this
+         * needs to happen after the state information is fully
+         * transferred. */
+        if (qemuProcessRefreshState(driver, vm, asyncJob) < 0)
+            goto stop;
+    }
 
     if (qemuProcessFinishStartup(driver, vm, asyncJob,
                                  !(flags & VIR_QEMU_PROCESS_START_PAUSED),
@@ -6945,11 +6952,6 @@ qemuProcessStart(virConnectPtr conn,
         /* Keep watching qemu log for errors during incoming migration, otherwise
          * unset reporting errors from qemu log. */
         qemuMonitorSetDomainLog(priv->mon, NULL, NULL, NULL);
-
-        /* Refresh state of devices from qemu. During migration this needs to
-         * happen after the state information is fully transferred. */
-        if (qemuProcessRefreshState(driver, vm, asyncJob) < 0)
-            goto stop;
     }
 
     ret = 0;
-- 
2.17.0