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Fix included in qemu-kvm-1.5.3-161.el7
Reproduce: qemu-kvm-1.5.3-160.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. Verify: qemu-kvm-1.5.3-161.el7 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. https://access.redhat.com/errata/RHSA-2019:2078