I'm a neophyte, I installed Qemu on Mac with Sierra 10.12.5, with some attempts to get it running, I have to solve two problems: the mouse runs slowly in Qemu and I do not know how to create a shared folder from Qemu and the host.
There is a solution to these problems. Thank you.

Hi,

There is no working shared folder functionality available right now.
Which Mac OS are you emulating? Have you checked the mouse speed settings in the guest OS?

Best,
Cat_7

Hi,
I emulate MacOs 9.2.1, about mouse tomorrow will control the settings.
I'm sorry that can not have a direct communication between Sierra and OS 9.2. Thank you.

I´m using SheepShaver to write onto the Qemu raw image.
Not that elegant but working.

If the QEMU HD is formatted HFS+, you can simply mount the image file in the OSX/macOS host and copy files to it or from it. To prevent possible file system corruption, be careful not to have the volume mounted in the host OS while QEMU is running.

Because you can mount/eject images on the fly in QEMU, you can also create a "transfer" image that you can mount on either the host or the guest. That way, you can leave QEMU running, and treat it as if you're taking a USB stick out of one machine and inserting it in the other to transfer files.

I found very useful the advice of Ronald P. Regensburg and adespoton to transfer files to and from Qemu. About my question on the mouse I have now put the speed on fast and is faster but it is not fluid, can not make precise moves.

Another way to transfer files - in my use case because I'm using an IDE in the host but compiling code on the ARM QEMU guest - is to setup something like fswatch in combination with a file syncing or copying tool (scp or rsync). When correctly configured this will copy files to the QEMU machine whenever they change.

scp on its own should be sufficient to move files to or from the guest without resorting to the risks of a mount-unmount cycle but requires running manually.

Couple of assumptions I've made: your host is a modern OS. fswatch works cross-platform but in subtly different ways. I've also assumed that the guest is running an ssh daemon. There's nothing stopping fswatch using FTP (and a corresponding guest FTP daemon) if that works for you. A Linux host also has inotify-based tools.

It's not strictly a shared folder but the end result is mostly the same.

HTH.

I just started experiencing the same problem; changing to -m mac99,via=pmu fixed the issue for me. Seems to be something introduced in the CUDA emulation.