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macOS 27 lets the host manage Secure Boot state in the EFI variable store. Add a persisted flag and a toggle in the Boot settings so generic UEFI guests on the Apple backend can opt in. The state is reconciled when the configuration is saved, using the default platform key and the default Microsoft signatures so that mainstream Linux distributions boot unmodified. The store is only written when its state differs from the configuration, and a virtual machine with the option off never fails to save because of it. The option defaults to off because guests without a Microsoft-signed bootloader would otherwise stop booting. Assisted-by: Claude:claude-fable-5-1
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macOS 27 lets the host manage Secure Boot state in a
VZEFIVariableStore. This adds a "Secure Boot" option for generic UEFI guests on the Apple Virtualization backend.SecureBootkey in the Apple boot configuration (defaults to off; older configurations load unchanged).The option defaults to off because guests without a Microsoft-signed bootloader would otherwise stop booting. There are no wizard or scripting changes.
Resolves #7874
Testing: Tested by a human on macOS 27.0 (26A428), MacBook Air (Apple M3). The author acknowledges that this change has been tested and/or reviewed by a human in accordance with UTM's AI contribution guidelines.
Checked with the Debian 13 arm64 installer: with the option on the guest boots through shim and GRUB reports
prohibited by secure boot policyforinsmod; a disk whose only loader is not Microsoft-signed is refused by the firmware; with the option off both boot normally; re-enabling after disabling works.