Search results
Results from the WOW.Com Content Network
Two common full virtualization techniques are typically used: (a) binary translation and (b) hardware-assisted full virtualization. [1] Binary translation automatically modifies the software on-the-fly to replace instructions that "pierce the virtual machine" with a different, virtual machine safe sequence of instructions. [7]
In computing, binary translation is a form of binary recompilation where sequences of instructions are translated from a source instruction set to the target instruction set. In some cases such as instruction set simulation , the target instruction set may be the same as the source instruction set, providing testing and debugging features such ...
Three techniques made virtualization of protected mode possible: Binary translation is used to rewrite certain ring 0 instructions in terms of ring 3 instructions, such as POPF, that would otherwise fail silently or behave differently when executed above ring 0, [3] [4]: 3 making the classic trap-and-emulate virtualization impossible.
The Quick Emulator (QEMU) [4] is a free and open-source emulator that uses dynamic binary translation to emulate a computer's processor; that is, it translates the emulated binary codes to an equivalent binary format which is executed by the machine.
[citation needed] A well-tuned caching binary translation system may achieve comparable performance, and it does in the case of x86 binary translation relative to first generation x86 hardware assist, which merely made sensitive instructions trappable. [6] Effectively this gives a theorem with different sufficiency conditions. [citation needed]
Cross-platform virtualization is a form of computer virtualization that allows software compiled for a specific instruction set and operating system to run unmodified on computers with different CPUs and/or operating systems, through a combination of dynamic binary translation and operating system call mapping.
IBM shipped this machine in 1966; it included page-translation-table hardware for virtual memory and other techniques that allowed a full virtualization of all kernel tasks, including I/O and interrupt handling. (The "official" operating system, the ill-fated TSS/360, did not employ full virtualization.) Both CP-40 and CP-67 began production ...
Simics is built for high performance execution of full-system models, and uses both binary translation and hardware-assisted virtualization to increase simulation speed. It is natively multithreaded and can simulate multiple target (or guest) processors and boards using multiple host threads.