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Description of problem:
qemu-img create a qcow2 nvme failed with error 'Protocol driver 'nvme' does not support image creation'

Version-Release number of selected component (if applicable):
qemu-img-rhev-2.12.0-3.el7.x86_64

How reproducible:
100%

Steps to Reproduce:
1.  # qemu-img create -f qcow2 nvme://0000:06:00.0/1 20G
2.
3.

Actual results:
qemu-img create a qcow2 nvme failed with error 'Protocol driver 'nvme' does not support image creation'

Expected results:
qcow2 nvme create successfully.

Additional info:

Try to reproduce on ppc64:

[root@ibm-p8-garrison-03 ~]# qemu-img create -f qcow2 nvme://0001:01:00.0/1 20G
qemu-img: nvme://0001:01:00.0/1: Protocol driver 'nvme' does not support image creation
[root@ibm-p8-garrison-03 ~]# rpm -qa| grep qemu
qemu-img-rhev-2.12.0-3.el7.ppc64le
qemu-kvm-tools-rhev-2.12.0-3.el7.ppc64le
qemu-kvm-common-rhev-2.12.0-3.el7.ppc64le
qemu-kvm-rhev-2.12.0-3.el7.ppc64le
qemu-kvm-rhev-debuginfo-2.12.0-3.el7.ppc64le
ipxe-roms-qemu-20170123-1.git4e85b27.el7_4.1.noarch
[root@ibm-p8-garrison-03 ~]# lspci | grep NVMe
0001:01:00.0 Non-Volatile memory controller: HGST, Inc. Ultrastar SN100 Series NVMe SSD (rev 05)
[root@ibm-p8-garrison-03 ~]# 

Same as x86.

WONTFIX for RHEL7. Already being tracked in RHEL8: Bug 1640894