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qcow is a file format for disk image files used by QEMU, a hosted virtual machine monitor. [1] It stands for "QEMU Copy On Write" and uses a disk storage optimization strategy that delays allocation of storage until it is actually needed.
System calls are thunked for endianness and for 32/64-bit mismatches. Fast cross-compilation and cross-debugging are the main targets for user-mode emulation. System emulation. In the system emulation mode, QEMU emulates a full computer system, including peripherals. It can be used to provide virtual hosting of several virtual computers on a ...
QEMU: 9.2.0 December 10, 2024: x86-64 PC, various platforms Cross-platform: GPL: Q: 0.9.1d118 x86-64 PC, various platforms OS X: Open source: SPC/AT: 0.97 March 10, 2014: x86-64 PC, various platforms Windows 64-bit, Android Linux (ARM) Open source: SimNow: 4.6.2 April 6, 2010: AMD K8 (Athlon 64 and Opteron) PC Windows 64-bit, Linux 64-bit ...
SeaBIOS also runs inside an emulator; it is the default BIOS for the QEMU and KVM virtualization environments, and can be used with the Bochs emulator. It is also included in some Chromebooks , although it is not used by ChromeOS .
x86 VT-x, x86-64 AMD-V x86, x86-64 No host OS Windows, Linux Proprietary, some components GPLv2 [10] Virtual Machine Manager: Red Hat: x86, x86-64 x86, x86-64 Linux Linux, Windows GPL version 2 Virtual PC 2007 (discontinued) Connectix and Microsoft: x86, x86-64 x86 Windows Vista (Business, Enterprise, Ultimate), XP Pro, XP Tablet PC Edition
It is analogous to Bochs and QEMU in that it emulates CPU instructions and select peripheral devices only. A vendor (or distributor) must still provide an operating system, and the user must install it. Hercules was the first mainframe emulator to incorporate 64-bit z/Architecture support.
The raw IMG file format is used by several tools: RaWrite and WinImage use the IMG disk image format to read and write floppy disk images. ImDisk and Virtual Floppy Drive can mount a raw image of a floppy disk to emulate a floppy drive under Microsoft Windows. Nero Burning ROM supports reading IMG files for creating bootable CDs.
Kernel-based Virtual Machine (KVM) is a free and open-source virtualization module in the Linux kernel that allows the kernel to function as a hypervisor.It was merged into the mainline Linux kernel in version 2.6.20, which was released on February 5, 2007. [1]