Intel VT-x (previously known as Intel VT) is the implementation of an Intel Secure Virtual Machine for the x86 IA-32 and Intel 64 architectures. The older designation, “Intel VT” (without the “x”), continues to be used by many BIOS menus.
VT-x is necessary for Intel systems in order to:
- run domUs under Xen Hardware Virtual Machine (HVM) (as well as run a guest system under Windows).
- run 64-bit guest systems under VMware.[1]
- to run virtualization with KVM.[2]
Information regarding the activation of Intel VT-x at the BIOS level (if supported by the Intel processor) can be found in the article, Activating the Intel VT Virtualization Feature.
As of the Nehalem architecture (Intel Xeon 55xx CPUs), VT-x includes the Intel Extended Page Tables (EPT).[3][4]
Intel VT-i (Intel Virtualization Technology for Itanium Processors)
Intel VT-i is the implementation of an Intel Secure Virtual Machine for the IA-64 architecture (Itanium).
Intel VT-d (Intel Virtualization Technology for Directed I/O)
Intel VT-d makes direct access to a PCI device possible for guest systems with the help of the Input/Output Memory Management Unit (IOMMU) provided. This allows a LAN card to be dedicated to a guest system, which makes attainment of increased network performance beyond that of an emulated LAN card possible. Of course, once such a direct access system has been implemented, live migration of the guest system is no longer possible. VMware can be configured for use with an activated Intel VT-d system using VMware VMDirectPath for direct access to PCI cards.
Pre-requisites for Intel VT-d
- The chip set as well as the BIOS used must support Intel VT-d.
- Requires the Intel Nehalem or later micro-architecture, such as that found in Xeon 34xx, 55xx and more recent, as well as other, desktop CPUs (see A List of Intel CPUs).
- There are no special requirements placed on the CPUs themselves, since VT-d is a function of the chip set. The CPU need merely support VT in general (see [5]).
Information regarding the activation of Intel VT-d at the BIOS level (if supported by the Intel processor) can be found in the article, Activating the Intel VT-d Virtualization Feature.
For additional information regarding VT-d, see:
- Understanding VT-d: Intel Virtualization Technology for Directed I/O (Intel Software Network)
- Step by Step Guide on How to Enable VT-d and Perform Direct Device Assignment (Intel Software Network)
- Intel Virtualization Technology for Directed I/O (VT-d): Enhancing Intel platforms for efficient virtualization of I/O devices (Intel Software Network)
- VTdHowTo (Xen Wiki)
- VMware VMDirectPath and Intel VT-d (YouTube)
- Intel Virtualization Technology for Directed I/O Architecture Specification (Intel Coporation)
Intel VT-c (Intel Virtualization Technology for Connectivity)
Intel VT-c is a collection of input/output (I/O) virtualization technologies. These technologies include:[6]
- Intel I/O Acceleration Technology for the Reduction of CPU Loads
- Virtual Machine Device Queues (VMDq) for the reduction of system latency, including:
- Single Root I/O Virtualization (SR-IOV) for the improvement of network I/O throughput (also known as Virtual Machine Direct Connect (VMDc))
The article, Activating the SR-IOV Virtualization Feature contains additional information about activating SR-IOV.
For additional information regarding VT-c, see:
- http://www.intel.com/network/connectivity/solutions/virtualization.htm
- Understanding VT-c: Virtualization Technology for Connectivity (Intel Software Network)
- PCI-SIG SR-IOV Primer
The following, as well as other, platforms support VT-c:
- Intel 75xx systems (Intel 7500 Chipset Boxboro-EX)[7]
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