On Tue, Apr 10, 2018 at 09:23:53AM +0000, Liang, Cunming wrote:
> If QEMU is going to build a user space driver framework there, we're open mind on that, even leveraging DPDK as the underlay library. Looking forward to more others' comments from community.

There is already an NVMe VFIO driver in QEMU (see block/nvme.c).  So in
principle there's no reason against userspace drivers in QEMU.

Stefan