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+disk driver with iothread setting hangs live migrations
+
+Per report raised at https://bugzilla.redhat.com/show_bug.cgi?id=1790093
+
+Description of problem:
+
+A disk driver definition using iothread parameter causes live migration with copy storage to hang during or just before the final ram sync stage.
+
+Interestingly, having the scsi controller as a separate iothread does not trigger the issue.
+
+Version-Release number of selected component (if applicable):
+
+I can reproduce this on centos7 with qemu-ev and with centos 8:
+
+qemu-kvm-ev-2.12.0-33.1.el7_7.4.x86_64
+qemu-kvm-2.12.0-65.module_el8.0.0+189+f9babebb.5.x86_64
+
+Steps to Reproduce:
+1. Create a definition with 1 iothread on the disk image:
+
+      <driver name='qemu' type='qcow2' iothread='1' />
+
+2. Issue a live migrate request like: virsh migrate --live --copy-storage-all vm qemu+tcp://remote/system
+3. Live migrate on source copies storage and then hangs at 80-99%, I guess during the ram copy phase.
+
+Keeping exactly the same config but without the iothread on the disk driver has successful migrations every time.
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