Virtualization

Virtualization and cloud computing have changed the scope of data centres today. As organizations are migrating from physical environments to a mix of physical, virtual, and cloud, because of the results obtained from performance gains. Organization's willingness to fully invest in virtualization and cloud because of the mix security solutions cause undue operational complexity, leaving unintentional security gaps.


Paravirtualization

Paravirtualization is an efficient and lightweight virtualization technique adopted in many virtualization platforms. PV does not need virtualization extensions from the host CPU. However, paravirtualized guests need a PV-enabled kernel and PV drivers, so the guests know the hypervisor and can run efficiently without emulation or virtual emulated hardware.


Full Virtualiation (HVM)

Full Virtualization or Hardware-assisted virtualizion uses virtualization extensions from the host CPU to virtualize guests. HVM requires Intel VT or AMD-V hardware extensions. IT uses Qemu to emulate PC hardware, including BIOS, IDE disk controller, VGA graphic adapter, USB controller, network adapter etc. Virtualization hardware extensions are utilized to boost performance of the emulation. Fully virtualized guests do not require any kernel support. This means that Windows operating systems can be used as HVM guest. Fully virtualized guests are usually slower than paravirtualized guests, because of the required emulation.

 

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