Allow monitor interaction when using migrate -exec

All,
     I've recently been playing around with migration via exec.  Unfortunately,
when starting the incoming qemu process with "-incoming exec:cmd", it suffers
the same problem that -incoming tcp used to suffer; namely, that you can't
interact with the monitor until after the migration has happened.  This causes
problems for libvirt usage of -incoming exec, since libvirt expects to be able
to access the monitor ahead of time.  This fairly simple patch allows you to
access the monitor both before and after the migration has completed using exec.

(note: developed/tested with qemu-kvm, but applies perfectly fine to qemu)

Signed-off-by: Chris Lalancette <clalance@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

1 files changed, 22 insertions, 11 deletions

diff --git a/migration-exec.c b/migration-exec.c
index f0869a1146..0dd5aff315 100644
--- a/migration-exec.c
+++ b/migration-exec.c
@@ -104,17 +104,11 @@ err_after_alloc:
     return NULL;
 }
 
-int exec_start_incoming_migration(const char *command)
+static void exec_accept_incoming_migration(void *opaque)
 {
+    QEMUFile *f = opaque;
     int ret;
-    QEMUFile *f;
 
-    dprintf("Attempting to start an incoming migration\n");
-    f = qemu_popen_cmd(command, "r");
-    if(f == NULL) {
-        dprintf("Unable to apply qemu wrapper to popen file\n");
-        return -errno;
-    }
     vm_stop(0); /* just in case */
     ret = qemu_loadvm_state(f);
     if (ret < 0) {
@@ -123,11 +117,28 @@ int exec_start_incoming_migration(const char *command)
     }
     qemu_announce_self();
     dprintf("successfully loaded vm state\n");
+    /* we've successfully migrated, close the fd */
+    qemu_set_fd_handler2(qemu_popen_fd(f), NULL, NULL, NULL, NULL);
     vm_start();
-    qemu_fclose(f);
-    return 0;
 
 err:
     qemu_fclose(f);
-    return -errno;
+}
+
+int exec_start_incoming_migration(const char *command)
+{
+    QEMUFile *f;
+
+    dprintf("Attempting to start an incoming migration\n");
+    f = qemu_popen_cmd(command, "r");
+    if(f == NULL) {
+        dprintf("Unable to apply qemu wrapper to popen file\n");
+        return -errno;
+    }
+
+    qemu_set_fd_handler2(qemu_popen_fd(f), NULL,
+			 exec_accept_incoming_migration, NULL,
+			 (void *)(unsigned long)f);
+
+    return 0;
 }