Hi, I would like to dipslay resource monitoring graph of CPU, Memory & Network of a running VM with Virtuization Framework. How can i do it with Swift? Is there a way we can do it without the need of guest agents.

Hi everyone, I am developing a macOS virtualization manager (VirtualProg) using the Virtualization.framework. The application is distributed via the Mac App Store, so it operates strictly within the App Store Sandbox. I am looking for a reliable, programmatic way to discover the IP address assigned to a guest (both macOS and Linux). Is there a recommended "Sandbox-safe" API or pattern within the Virtualization framework—or a lower-level networking entitlement—that allows a host application to retrieve the guest's assigned IP address? Ideally, I am looking for a solution that does not require the user to manually install a non-sandboxed helper tool. Thanks in advance for any insights or guidance!

Hi, Is there way to connect the host usb devices directly to guest vms using mac os Virtualization framework? Thanks

Hi, I saw the mac os 27 new features video https://developer.apple.com/videos/play/wwdc2026/224/?time=64 and was trying Provisioning and i get this warning [Internal] Thread running at User-interactive quality-of-service class waiting on a lower QoS thread running at Default quality-of-service class. Investigate ways to avoid priority inversions at the line try startupOptions.setGuestProvisioning(opts) i have my vm q declared like this let vmQueue = DispatchQueue(label: "VZVirtualMachineQueue", qos: .userInteractive) and i am executing like this self.vmQueue.async { [weak self] in ......... ......... let startupOptions = VZMacOSVirtualMachineStartOptions() try? startupOptions.setGuestProvisioning(opts) vm.start(startupOptions) } and it fails with treading warning and provisioning does not happen. Thanks in advance for the help

Hi, I wanted to develop a small tool to launch Home Assistant OS in a Virtualization.framework VM. Something lean (no UI, no daemons), zero-config, and Apple Silicon only. I got that running, but I wanted to also use bridge networking and USB device pass-through which require the com.apple.vm.networking and com.apple.developer.accessory-access.usb entitlements, respectively. I was unable to use those for local development using ad-hoc signing, so I guess it requires a paid Apple Developer account and official approval so that they can be enabled in provisioning profiles. I'm open to reactivating my developer subscription which I let expire years ago, but wanted to first assess the chances of getting approval (no point in renewing the subscription if I won't get the permission in the end). I could make this an open source project, if it helps.

I have successfully booted the Linux Kernel with VirtIOFS as the rootfs, but file permission issues render it completely unusable. A file on the macOS host belongs to uid 0, gid 0, but on the Linux guest, this file belongs to uid 1000, gid 10. Why does this happen? How are file permissions directly mapped between the host and the guest? If there is no mapping mechanism in place, why does this discrepancy occur? This leads to errors in Linux, such as: sudo: /etc/sudo.conf is owned by uid 1000, should be 0 sudo: /usr/bin/sudo must be owned by uid 0 and have the setuid bit set bootLoader.commandLine = "console=hvc0 rootfstype=virtiofs root=myfs rw" let directorySharingDevice = VZVirtioFileSystemDeviceConfiguration(tag: "myfs") directorySharingDevice.share = VZSingleDirectoryShare(directory: VZSharedDirectory(url: rootURL!, readOnly: false)) The VMM is running as root.

We are looking to scale up our automated testing infrastructure for macOS development. Ideally, we want to create a large-scale testing farm capable of running parallel integration tests across multiple OS versions and configurations. However, we are running into a major roadblock with the Software License Agreement (SLA) limitation, which restricts the concurrent execution of macOS within virtualized environments to a maximum of two (2) instances per physical host. This restriction creates a massive bottleneck for high-end hardware. Investing in powerful machines like the Mac Studio or Mac Pro feels entirely inefficient for this use case; their massive core counts and memory capacities are effectively wasted if the host is legally throttled to just two concurrent VMs. Given this friction, we have a few questions for the community and any Apple engineers tuning in: are there any known plans, official updates, or historical precedents suggesting Apple might revise or remove this 2-VM limit for enterprise testing workflows? Any insights, policy updates, or architectural recommendations on building large-scale, compliant macOS test farms without underutilizing high-end hardware would be greatly appreciated. Thank you!

I have the following code for port forwarding in mac os virtualization var ipAddr = in_addr() // 1. Convert String to in_addr inet_pton(AF_INET, guestIP, &ipAddr) let status = vmnet_network_configuration_add_port_forwarding_rule( config, UInt8(IPPROTO_TCP), // TCP protocol sa_family_t(AF_INET), // address family guestPort, // internal port (guest) externalPort, // external port (host) &ipAddr // internal address (guest IP) ) if status == .VMNET_SUCCESS { print("✅ Port Forwarding set: Mac:\(externalPort) -> VM(\(guestIP)):\(guestPort)") } else { print("❌ Port Forwarding failed for \(guestIP): \(status.rawValue)") } It is returning success but when i test it it does not work. Is there anything i am doing wrong? Please help me also in fixing this problem. Note: The app runs in sandbox i tried without sandboxing and it does not work either. Please refer to this link https://developer.apple.com/forums/thread/822025?login=true&page=1#884236022 how i am creating the VZVmnetNetworkDeviceAttachment

Hi, I see that with mac os 27 we have diskimagekit https://developer.apple.com/documentation/DiskImageKit the stacked disk image gives us the possibility of creating incremental snapshots which is wonderful addition to the virtualization framework. But is there a way to merge back stacked image to base image? Thanks & Regards

There are some async/await methods in Virtualization; however there's also the ability to specific DispatchQueue. What's the guidance on using these all safely? What are use cases for specifying specific DispatchQueues?

Does Virtualization.framework support delegating a Thunderbolt/PCIe device to a Linux guest VM running on Apple Silicon? We're developing a custom PCIe device and would like to iterate on the driver in a Linux VM environment on the same host.

As the title says, I'd like to run a macOS 27 VM on my Mac (the host is on macOS 26.5.1) in order to test my apps without having to update my host to a beta. My virtualization app of choice (VirtualBuddy) fails on installation when I use the restore image for macOS 27.0 (26A5353q) from the developer website. The developer of VirtualBuddy believes this is a macOS limitation (https://github.com/insidegui/VirtualBuddy/discussions/683). (I filed FB22977958, but I'm not sure if they filed their own bug.) Is there a workaround? It'd be very nice to have access to this during WWDC week. Usually I'd look for device support files on the developer website for download and/or install the Xcode beta first, but I've already installed the Xcode beta and there don't seem to be any device support files available.

Is it possible to wait for mobileassetd to finish downloading from both macOS and within an iOS Simulator. We create a VM but as we boot them up regularly for CI jobs, if the VM on creation hadn't finished downloading a bunch of things we see network activity. Just wondering if a way exists to inspect the state of mobileassetd so we can wait for it to finish downloading stuff before completing the VM image build.

Is there a way to retrieve restore images of previous versions of macOS and additionally checking whether a restore image is valid (i.e. signed) without attempting to install it?

How do I run observability with virtual machines - internally, externally or both?

Do you have any tips for increasing the speed of a Virtual Machines boot time?

Can a MacOS 27 beta VM run on MacOS 26 system?

For some strange reason entering recovery mode options in a 26/27 VM takes 1m, compared to ~10s on < 26 VMs. Any idea where this delay is coming from? I do not observe the same delay on real HW for 26/27. Thanks! FB22085236

Will we be able to access USB devices without private APIs?

For a 3D workload going through Virtualization.framework's graphics device, what's the supported/expected path for the guest to drive host-side Metal rendering, and what are the known performance sharp edges? Is zero-copy IOSurface sharing between host and guest a sanctioned pattern? What are the best practices and limits for high-throughput texture handoff across the VM boundary? We translate a foreign 3D command stream into Metal on the host. Any guidance on command-buffer batching, synchronization, or present/vsync alignment to keep latency low?