Fix included in qemu-kvm-1.5.3-161.el7
Same steps as https://bugzilla.redhat.com/show_bug.cgi?id=1650272#c4 , reproduced with rhel8 guest. For rhel7 guest, need do reboot at last, then the DMA error happens.
The issue is gone for both rhel7 and rhel8 guest.
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.