Device 'kvm-pci-assign' could not be initialized

/etc/libvirt/qemu.conf:


# The user ID for QEMU processes run by the system instance.
user = "root"


# The group ID for QEMU processes run by the system instance.
group = "root"
and


# If clear_emulator_capabilities is enabled, libvirt will drop all
# privileged capabilities of the QEmu/KVM emulator. This is enabled by
# default.
#
# Warning: Disabling this option means that a compromised guest can
# exploit the privileges and possibly do damage to the host.
#
clear_emulator_capabilities = 0
Note: This will make your guest run as root with all its capabilities (insecure)

https://ask.fedoraproject.org/question/9531/kvm-device-pci-assign-could-not-be-initialized/