On my HP Elite laptop with Intel(R) Core(TM) i7-3820QM CPU @ 2.70GHz, id 0x306a9, it works as good as it can get, I use it constantly.
/dev/nvmm is c 345 0, 640, owner root, group nvmm. The user is also a member of the nvmm group. I run it on -current, 9.99.59 at the moment. The latest versions of emulators/qemu do have the support for nvmm, in my case qemu-4.2.0nb12. Performance is quite reasonable as well. The disks I use for all virtual machines are zfs zvolsn networking is bridged. Typical invocation command: Z-fw10p() { /usr/pkg/bin/qemu-system-x86_64 \ -device qemu-xhci \ -device usb-tablet \ -m 3072M \ -k en-gb \ -accel nvmm \ -vnc :5 \ -drive format=raw,file=/dev/zvol/rdsk/pail/w10 \ -vga vmware \ -net tap,fd=3 3<>/dev/tap0 \ -net nic } but I have some server type systems without graphics, e,g, my Xen Orchestrator machine: Z-Cxorch() { /usr/pkg/bin/qemu-system-x86_64 \ -serial mon:stdio \ -nographic \ -m 4096M \ -k en-gb \ -accel nvmm \ -smp 2 \ -drive format=raw,file=/dev/zvol/rdsk/pail/zorch \ -net tap,fd=6 6<>/dev/tap5 \ -net nic } Works just fine. Chavdar