>You don't have to write "fsdriver" here, but replace it with "local", >"handle" or "proxy".
Still get the same error mahmood@cluster:qemu-vm$ qemu-system-x86_64 -m 4000 -cpu Opteron_G5 -smp 2 -hda centos7server.img -boot c -usbdevice tablet -enable-kvm -device e1000,netdev=host_files -netdev user,net=10.0.2.0/24,id=host_files -virtfs local,id=shared,path=/home/mahmood/Downloads,mount_tag=Downloads qemu-system-x86_64: -virtfs local,id=shared,path=/home/mahmood/Downloads,mount_tag=Downloads: Parameter 'driver' expects device type mahmood@cluster:qemu-vm$ qemu-system-x86_64 -m 4000 -cpu Opteron_G5 -smp 2 -hda centos7server.img -boot c -usbdevice tablet -enable-kvm -device e1000,netdev=host_files -netdev user,net=10.0.2.0/24,id=host_files -virtfs handle,id=shared,path=/home/mahmood/Downloads,mount_tag=Downloads qemu-system-x86_64: -virtfs handle,id=shared,path=/home/mahmood/Downloads,mount_tag=Downloads: Parameter 'driver' expects device type mahmood@cluster:qemu-vm$ qemu-system-x86_64 -m 4000 -cpu Opteron_G5 -smp 2 -hda centos7server.img -boot c -usbdevice tablet -enable-kvm -device e1000,netdev=host_files -netdev user,net=10.0.2.0/24,id=host_files -virtfs proxy,id=shared,path=/home/mahmood/Downloads,mount_tag=Downloads qemu-system-x86_64: -virtfs proxy,id=shared,path=/home/mahmood/Downloads,mount_tag=Downloads: Parameter 'driver' expects device type Regards, Mahmood