Legacy: The legacy option is chosen for VMs which were created with older VirtualBox versions and will pick a paravirtualization interface while starting the VM with VirtualBox 5.0 and newer. This is the default option chosen while creating new VMs. None: Specifying none explicitly turns off exposing any paravirtualization interface.ĭefault: The option default, will pick an appropriate interface depending on the guest OS type while starting the VM. The other options in the drop down do the following, as explained in the vboxmanage docs: This provider is recommended for Windows guests. VirtualBox's implementation currently supports paravirtualized clocks, APIC frequency reporting, guest debugging, guest crash reporting and relaxed timer checks. Hyper-V: Presents a Microsoft Hyper-V hypervisor interface which is recognized by Windows 7 and newer operating systems. This provider is recommended for Linux guests. VirtualBox's implementation currently supports paravirtualized clocks and SMP spinlocks. KVM: Presents a Linux KVM hypervisor interface which is recognized by Linux kernels starting with version 2.6.25. ![]() This provider is mandatory for running any Mac OS Additionally, reports the TSC and APIC frequency to the guest operating system. ![]() Minimal: Announces the presence of a virtualized environment. The VirtualBox Manual, in the section titled Paravirtualization providers explains very clearly when each should be used (emphasis added):
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