Viridik Mac OS

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In a new development uncovered by Qemu developer Gerd Hoffmann, Apple has apparently added early support for VirtIO and framebuffer graphics in a later Mac OS Mojave release.

These new Mac OS drivers (kexts) include support for stdvga and cirrus vga, to what extent still isn't clear. What will probably be more interesting for passthrough users, though, is the addition of virtio-blk for disk passthrough and virtio-9p for drive sharing.

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Mac OS Virtio is Here

In Hoffmann's testing, both work with a little tweaking. He states that the virtio-blk driver only works in legacy mode, and the 9p share just needs to be mounted.

Clearly further testing is going to be needed to work out best practices and methodology, but it's an extremely encouraging sign for those using Mac OS VMs daily. Baldis basics the old laboratory fat mac os.

Once we work out exactly how to support these features, it will mean better disk performance and more seamless host-guest communication.

Mac-OS-SimpleKVM maintainer Foxlet observed that this may be due to the re-introduction of rack mount mac pros, which would make perfect sense.

The high-spec models will be more than capable of advanced virtualization, so Apple is probably doing what they can to support that endeavor for customers. It may not be their intention, but this might also vastly improve quality of life for Hackintosh OS X VM users as well.

Viridik Mac Os Catalina

It's still early days, so we may very well see increased VirtIO driver support in future releases. Networking might even be on the table. In the meantime, all we can do is wait and hope that new kexts keep rolling in.

We'll continue covering this as the situation develops, and hopefully have a method for leveraging these changes soon. In the meantime, if any tinkerers want to test VirtIO, please let us know how it goes on our discord or in the comments.

Images Courtesy Gerd Hoffmann

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Virtual machines are great. We use them for debugging, compatibility testing, isolation, and as a substitute for multi-booting. Windows and Linux have broad support for running as guest operating systems, but it has only recently become possible and practical to run OS X/macOS in such a way, especially in open source virtualisation environments. OS X/macOS now runs in both Qemu/KVM and VirtualBox. The former has become a lot less difficult to achieve recently, especially with Gabriel L. Somlo's efforts in upstreaming patches and excellent instructions. Nevertheless, some inconveniences remain, and we have been working on improving this situation by writing guest drivers. Initially, this was a project for our spare time; more recently, there has been corporate interest in this, so some improvements have been sponsored.

Drivers available so far:

  • OS X driver for the virtio network device - for use with both VirtualBox and Qemu.
  • Coming soon: Virtio Block Device, Virtio SCSI Controller, Virtio Memory Balloon

We hope you find these drivers useful!

What's new

  • 30 Sep 2016 — Qemu USB Tablet driver version 1.2, now with support for OS X 10.11 and macOS 10.12. Some of the work in this update was sponsored by Rainforest QA Inc.

Driver for Qemu's usb-tablet absolute pointing device

Latest version: 1.2 - download installer (codesigned).

Viridik Mac Os 11

Source code: github code browser and git repository.

When running a virtual machine in a window, it's useful to simulate an absolute pointing device, so that the host computer's mouse cursor motion through the window is seamless. Qemu offers such a device via the -device usb-tablet option (in contrast to -device usb-mouse). Unfortunately, OS X's HID device drivers don't pick up this device correctly.

To solve the problem, we've written a driver that makes it work.

On OS X 10.8 and earlier, all that is needed is a codeless kext that tells Apple's driver that it already knows how to drive the device.

OS X 10.9 and newer treat the device as an analog stick when you do this, converting distance from the middle of the screen as a velocity to apply to relative motion of the mouse cursor. This is an even worse user experience than with the usb-mouse device, so we've written another kext that subtly rewrites the device's HID report descriptor before Apple's driver has a chance to pick it up. Specifically, the device reports a usage mode of 'pointer' (1). OS X's drivers expect either 'Mouse' (2) or 'Digitiser', so the kext changes that single byte from 1 to 2 and everything starts working. OS Tetriphys: the thing that should not be mac os.

On OS X 10.11 and macOS 10.12, the 10.9/10.10 driver does not work due to the rewritten USB stack. Since version 1.2, the driver therefore contains a third kext, which builds on this new stack but otherwise behaves very similarly to the 10.9 driver.

Supported versions of OS X:

  • 10.5.x and earlier: ? may work, but untested
  • 10.6.0 - 10.6.8 Snow Leopard: ✓ confirmed working
  • 10.7.x Lion: ? should work, but untested
  • 10.8.4 - 10.8.5 Mountain Lion: ✓ confirmed working (10.8 - 10.8.3 should also work)
  • 10.9.4 - 10.9.5 Mavericks: ✓ confirmed working (10.9 - 10.9.3 should also work)
  • 10.10.5 Yosemite: Known working as of version 1.2 of the driver.
  • 10.11.6 El Capitan: Known working as of version 1.2 of the driver.
  • 10.12 Sierra: Known working as of version 1.2 of the driver.

To use this driver:

  • Have OS X running in a Qemu (KVM) virtual machine, for example using these excellent instructions.
  • Download the driver installer above to the virtual machine, or build it from source code.
  • Run the installer (this requires administrator access)
  • Shut down the virtual machine
  • Start the virtual machine back up with the usb-tablet device instead of the mouse.

Release change log:

1.0

Initial release

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1.1

Disabled OS X's pointer coordinate scaling, so that the guest cursor now precisely tracks the host cursor.

1.2

  • Added a third kext for OS X 10.11 'El Capitan' and macOS 10.12 'Sierra'. This was sponsored by Rainforest QA Inc.
  • The installer package now only installs the kexts that are required for the target version of OS X/macOS, as well as any later versions. (So that OS upgrades run smoothly.) This fixes the problem where the installer fails due to being unable to write to /System/Library/Extensions/ on recent OS versions.




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