[fedora-virt] images on tmpfs?

Anyone know why qemu wouldn't want to run a virtual
machine installing to a qcow2 image file on a tmpfs
filesystem?

They are doing a lot of test installs in virtual machines
at work, and I suggested creating a storage pool
in tmpfs (the host machine has vast amounts of memory)
as something that might make the install go faster,
but it seems to refuse to even attempt to use the
tmpfs image.
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