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With some motherboards, users must enable Intel's VT-x feature in the BIOS setup before applications can make use of it. [23] Intel started to include Extended Page Tables (EPT), [24] a technology for page-table virtualization, [25] since the Nehalem architecture, [26] [27] released in 2008.
Instruction set extensions that have been added to the x86 instruction set in order to support hardware virtualization.These extensions provide instructions for entering and leaving a virtualized execution context and for loading virtual-machine control structures (VMCSs), which hold the state of the guest and host, along with fields which control processor behavior within the virtual machine.
The vast majority of Intel server chips of the Xeon E3, Xeon E5, and Xeon E7 product lines support VT-d. The first—and least powerful—Xeon to support VT-d was the E5502 launched Q1'09 with two cores at 1.86 GHz on a 45 nm process. [2] Many or most Xeons subsequent to this support VT-d.
EPT support is found in Intel's Core i3, Core i5, Core i7 and Core i9 CPUs, among others. [6] It is also found in some newer VIA CPUs. EPT is required in order to launch a logical processor directly in real mode , a feature called "unrestricted guest" in Intel's jargon, and introduced in the Westmere microarchitecture .
VirtualBox supports both Intel's VT-x and AMD's AMD-V hardware-assisted virtualization. Making use of these facilities, VirtualBox can run each guest VM in its own separate address-space; the guest OS ring 0 code runs on the host at ring 0 in VMX non-root mode rather than in ring 1.
Intel AMT is the set of management and security features built into vPro PCs that makes it easier for a sys-admin to monitor, maintain, secure, and service PCs. [11] Intel AMT (the management technology) is sometimes mistaken for being the same as Intel vPro (the PC "platform"), because AMT is one of the most visible technologies of an Intel vPro-based PC.
Virtual Machine Extensions Enable: see Intel VT-x x86 virtualization. 14: SMXE: Safer Mode Extensions Enable: see Trusted Execution Technology (TXT) 15 [a] (Reserved) — 16: FSGSBASE: FSGSBASE Enable: If set, enables the instructions RDFSBASE, RDGSBASE, WRFSBASE, and WRGSBASE. 17: PCIDE: PCID Enable: If set, enables process-context identifiers ...
Intel 5-level paging, referred to simply as 5-level paging in Intel documents, is a processor extension for the x86-64 line of processors. [ 1 ] : 11 It extends the size of virtual addresses from 48 bits to 57 bits by adding an additional level to x86-64's multilevel page tables , increasing the addressable virtual memory from 256 TiB to 128 PiB .