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QEMU integrates several services to allow the host and guest systems to communicate for example: an integrated SMB server and network-port redirection (to allow incoming connections to the virtual machine). It can also boot Linux kernels without a bootloader. QEMU does not depend on the presence of graphical output methods on the host system.
qemu/kvm The QEMU maintainers merged support for providing SPICE remote desktop capabilities for all QEMU virtual machines in March 2010. The QEMU binary links to the spice-server library to provide this capability and implements the QXL paravirtualized framebuffer device to enable the guest OS to take advantage of the performance benefits the ...
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 ]
VM exits significantly impact code execution performance. [12] [13] With MBE, the same page table can be shared between unsigned usermode code and signed kernelmode code, with two sets of execute permission depending on the execution context. VM exits are no longer necessary when execution context switches between unsigned usermode and signed ...
QEMU w/ kqemu module Fabrice Bellard: x86, x86-64 Same as host Linux, FreeBSD, OpenBSD, Solaris, Windows Changes regularly [7] GPL/LGPL: QEMU w/ qvm86 module Paul Brook x86 x86 Linux, NetBSD, Windows Changes regularly GPL: QuickTransit: Transitive Corp. x86, x86-64, IA-64, POWER MIPS, PowerPC, SPARC, x86 Linux, OS X, Solaris Linux, OS X, Irix ...
In both cases, VirtualBox uses CSAM and PATM to inspect and patch the offending instructions whenever a fault occurs. VirtualBox also contains a dynamic recompiler, based on QEMU to recompile any real mode or protected mode code entirely (e.g. BIOS code, a DOS guest, or any operating system startup). [42]
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 .
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]