I think we can raise this issue to libvirt. When using virsh or virt-
manager, the memory balloon is still enabled by default even if there's
a device assignment.

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  VFIO device gets DMA failures when virtio-balloon leak from highmem to

Status in QEMU:

Bug description:
  Is there any known conflict between VFIO passthrough device and

  The VM has:
  1. 4GB system memory
  2. one VFIO passthrough device which supports high address memory DMA and 
uses GFP_HIGHUSER pages.
  3. Memory balloon device with 4GB target.

  When setting the memory balloon target to 1GB and 4GB in loop during
  runtime (I used the command "virsh qemu-monitor-command debian --hmp
  --cmd balloon 1024"), the VFIO device DMA randomly gets failure.

  More clues:
  1. configure 2GB system memory (no highmem) VM, no issue with similar 
  2. setting the memory balloon to higher like 8GB, no issue with similar 

  I'm also trying to narrow down this issue. It's appreciated for that
  you guys may share some thoughts.

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