[PATCH v7 03/15] s390x: protvirt: Add migration blocker

[Janosch Frank]

Migration is not yet supported.

Signed-off-by: Janosch Frank <fran...@linux.ibm.com>
---
 hw/s390x/s390-virtio-ccw.c | 26 ++++++++++++++++++++++++--
 1 file changed, 24 insertions(+), 2 deletions(-)

diff --git a/hw/s390x/s390-virtio-ccw.c b/hw/s390x/s390-virtio-ccw.c
index f718cfc591..4bb38704ff 100644
--- a/hw/s390x/s390-virtio-ccw.c
+++ b/hw/s390x/s390-virtio-ccw.c
@@ -43,6 +43,9 @@
 #include "sysemu/sysemu.h"
 #include "hw/s390x/pv.h"
 #include <linux/kvm.h>
+#include "migration/blocker.h"
+
+static Error *pv_mig_blocker;
 
 S390CPU *s390_cpu_addr2state(uint16_t cpu_addr)
 {
@@ -331,16 +334,33 @@ static void s390_machine_unprotect(S390CcwMachineState 
*ms)
         }
         ms->pv = false;
     }
+    migrate_del_blocker(pv_mig_blocker);
+    error_free(pv_mig_blocker);
+    pv_mig_blocker = NULL;
 }
 
 static int s390_machine_protect(S390CcwMachineState *ms)
 {
+    static Error *local_err;
     CPUState *t;
     int rc;
 
+    error_setg(&pv_mig_blocker,
+               "protected VMs are currently not migrateable.");
+    rc = migrate_add_blocker(pv_mig_blocker, &local_err);
+    if (local_err) {
+        error_report_err(local_err);
+        error_free(pv_mig_blocker);
+        pv_mig_blocker = NULL;
+        return rc;
+    }
+
     /* Create SE VM */
     rc = s390_pv_vm_enable();
     if (rc) {
+        error_report_err(local_err);
+        error_free(pv_mig_blocker);
+        pv_mig_blocker = NULL;
         return rc;
     }
 
@@ -470,11 +490,13 @@ static void s390_machine_reset(MachineState *machine)
 
         if (s390_machine_protect(ms)) {
             s390_machine_inject_pv_error(cs);
-            s390_cpu_set_state(S390_CPU_STATE_OPERATING, cpu);
-            return;
+            goto pv_err;
         }
 
         run_on_cpu(cs, s390_do_cpu_load_normal, RUN_ON_CPU_NULL);
+pv_err:
+        /* Continue after the diag308 so the guest knows something went wrong. 
*/
+        s390_cpu_set_state(S390_CPU_STATE_OPERATING, cpu);
         break;
     default:
         g_assert_not_reached();
-- 
2.20.1