However, there are some manual operations that should be done to enable a PXE boot for Gen 1 VMs. PXE Boot Optionīoth Gen 1 and Gen 2 VMs support a PXE (pre-boot execution environment), which is a network boot. Hyper-V Integration Services must be installed to enable the SCSI controller for Gen 1 VMs. For example, Gen 1 VMs can use only legacy IDE drivers for emulated devices before a file system is initialized. The support of synthetic VMBUS drivers for synthetic hardware during VM boot allows the use of SCSI drivers at the boot. Gen 2 VMs can be loaded from SCSI virtual disks because UEFI supports such communication with the SCSI controller while BIOS doesn’t. These features are available because Hyper-V Gen 2 VMs support UEFI. Secure Boot is a feature that allows protection against modifying boot loaders and main system files this is done by comparing the digital signatures that must be trusted by the Original Equipment Manufacturer (OEM). GPT partitioning scheme allows one to overcome the limit of 2-TB disks for which the maximum number of partitions is 4 for a MBR partitioning scheme. Some of these are GPT (GUID Partition Table) support and Secure Boot. UEFI is not just a replacement of BIOS, UEFI extends support of devices and features. The term “UEFI BIOS” is also used for better understanding. UEFI (Unified Extensible Firmware Interface) is low-level software that, similarly to BIOS, starts after powering on the computer ahead of loading the operating system (OS). 2: Improvements of Gen2 VMs UEFI BIOS Support.
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