From 5a990e0bf3248e4c6bdaebce5d5e2a1e3f310c64 Mon Sep 17 00:00:00 2001
From: Peter Krempa <pkrempa@redhat.com>
Date: Fri, 7 Apr 2017 17:39:39 +0200
Subject: [PATCH] qemu: migration: Reject migration of an empty disk

If you specify disks to migrate it would be possible to select an empty
drive for migration. Reject such config.
---
 src/qemu/qemu_migration.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/qemu/qemu_migration.c b/src/qemu/qemu_migration.c
index b3d42619f2..9b3285f302 100644
--- a/src/qemu/qemu_migration.c
+++ b/src/qemu/qemu_migration.c
@@ -515,9 +515,10 @@ qemuMigrationStartNBDServer(virQEMUDriverPtr driver,
         if (!qemuMigrateDisk(disk, nmigrate_disks, migrate_disks))
             continue;
 
-        if (disk->src->readonly) {
+        if (disk->src->readonly || virStorageSourceIsEmpty(disk->src)) {
             virReportError(VIR_ERR_OPERATION_UNSUPPORTED,
-                           _("Cannot migrate read-only disk %s"), disk->dst);
+                           _("Cannot migrate empty or read-only disk %s"),
+                           disk->dst);
             goto cleanup;
         }