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x86 virtualization is the use of hardware-assisted virtualization capabilities on an x86/x86-64 CPU.. In the late 1990s x86 virtualization was achieved by complex software techniques, necessary to compensate for the processor's lack of hardware-assisted virtualization capabilities while attaining reasonable performance.
The Pentium architecture added a number of enhancements to the virtual 8086 mode. These were however documented by Intel only starting with the subsequent P6 (microarchitecture) ; [ 6 ] their more recent formal name is Virtual-8086 Mode Extensions, abbreviated VME [ 7 ] (older documentation may use "Virtual 8086 mode enhancements" as the VME ...
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.
KVM (Kernel-based Virtual Machine) is a FreeBSD and Linux kernel module that allows a user space program access to the hardware virtualization features of various processors, with which QEMU can offer virtualization for x86, PowerPC, and S/390 guests. When the target architecture is the same as the host architecture, QEMU can make use of KVM ...
Therefore, to compensate for these architectural limitations, designers accomplished virtualization of the x86 architecture through two methods: full virtualization or paravirtualization. [4] Both create the illusion of physical hardware to achieve the goal of operating system independence from the hardware but present some trade-offs in ...
An x86-64 processor acts identically to an IA-32 processor when running in real mode or protected mode, which are supported modes when the processor is not in long mode.. A bit in the CPUID extended attributes field informs programs in real or protected modes if the processor can go to long mode, which allows a program to detect an x86-64 processor.
Once the undisputed leader in computer processors that weren’t for mobile handsets or embedded devices, Intel’s x86 architecture is increasingly being challenged by Arm’s more efficient ...
Microprocessor modes for the x86 architecture; Real mode ; 8080 emulation mode (NEC V20/V30 only) Protected mode (Intel 80286) Unreal mode (Intel 80286) Virtual 8086 mode (Intel 80386) System Management Mode (Intel 386SL) Long mode (AMD Athlon 64) x86 virtualization (Intel Pentium 4, AMD Athlon 64) AIS mode (VIA C3 only)