Turning it on after installation will have no effect however.Įrgo, if you installed a Windows Guest like Windows XP on to a VM with I/O APIC off, the Windows Guest will only install with a single core / thread kernel. As with ACPI, the I/O APIC therefore must not be turned off after installation of a Windows guest OS. Namely -Īll Windows OSes install different kernels, depending on whether an I/O APIC is available. That being said Windows does have a major limitation. However, you need to I/O APIC for it to work. Virtual Box does multicore VMs just fine. That is a moving target, so google how and carefully consider the consequences of disabling these features.00:00:06.530727 NEM:Ġ0:00:06.530769 CPUM: No hardware-virtualization capability detectedĮrgo, you are running Virtual Box on a Windows Host with Hyper-v enabled. 00:00:06.444691 HM: HMR3Init: Attempting fall back to NEM: VT-x is not availableĠ0:00:06.529033 NEM: info: Found optional import WinHvPlatform.dll!WHvQueryGpaRangeDirtyBitmap.Ġ0:00:06.529049 NEM: info: Found optional import vid.dll!VidGetHvPartitionId.Ġ0:00:06.529057 NEM: info: Found optional import vid.dll!VidGetPartitionProperty.Ġ0:00:06.529128 NEM: WHvCapabilit圜odeHypervisorPresent is TRUE, so this might work.Ġ0:00:06.530726 NEM: NEMR3Init: Snail execution mode is active!00:00:06.530726 NEM: Note! VirtualBox is not able to run at its full potential in this execution mode.Ġ0:00:06.530727 NEM: To see VirtualBox run at max speed you need to disable all Windows featuresĠ0:00:06.530727 NEM: making use of Hyper-V.
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