Muli Ben-Yehuda wrote:
KVM, Xen and VMWare ESX are just different implementations of the same
technology,
Sure, just like Windows and Linux are just different implementations
of the same technology.
I'll clarify.
KVM, Xen and VMWare ESX reside in one category for virtualization. The
other VMWares, VirtualBox, Virtual PC for Windows, DosBox and Qemu with
the acceleration reside in another. Qemu in its pure form (as well as
when running non Intel platforms), Virtual PC for Mac on Power PC, as
well as the Commodor 64 and Apple II emulators, UAE, and a host of other
emulators reside in a third category.
The first enslave the entire host OS for the purpose of running the
virtualization (hypervisors), the second are basically user space
programs (with some "cheating") which use the CPU capabilities for some
virtualization enhancements, and the third are complete emulation, from
the grounds up, emulating every aspect of the destination machines.
Puristically speaking, only the third category can really be called
"emulators". In that respect, KVM, Xen and VMWare ESX just different
implementations of the same technology.
Shachar
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