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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.
On November 14, 2005, Intel released two models of Pentium 4 (Model 662 and 672) as the first Intel processors to support VT-x. The CPU flag for VT-x capability is "vmx"; in Linux, this can be checked via /proc/cpuinfo, or in macOS via sysctl machdep.cpu.features. [19] [21] [22]
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.
Some later Intel 486 chips also support it. [ 8 ] [ 9 ] The enhancements address mainly the 8086 virtualization overhead, with a particular focus on (virtual) interrupts. [ 6 ] [ 10 ] Before the extensions were publicly documented in the P6 documentation, the official documentation referred to the famed Appendix H , which was omitted from the ...
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.
Introduced support of Intel VT-x/AMD-V virtualization instructions, as well as x86-64 and multi-processor virtual machines [28] 6.0 [29] 9 May 2007 Multiple monitor support; Background virtual machines; High-speed USB devices (EHCI) 6.5 [30] 23 September 2008 Final version to support CPUs without PAE [31] Record Replay [32] Unicode; Unity mode
Hyper-V uses the VT-x on Intel or AMD-V on AMD x86 virtualization. Since Hyper-V is a native hypervisor, as long as it is installed, third-party software cannot use VT-x or AMD-V. For instance, the Intel HAXM Android device emulator (used by Android Studio or Microsoft Visual Studio) cannot run while Hyper-V is installed. [43]
Intel's Hardware Accelerated Execution Manager (HAXM) is an open-source alternative [16] to KVM for x86-based hardware-assisted virtualization on NetBSD, Linux, Windows and macOS using Intel VT. As of 2013 Intel mostly solicits its use with QEMU for Android development. [17] Starting with version 2.9.0, the official QEMU includes support for ...