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Saw this post but couldn't comment:

VM sandboxing- what happens?

Is it possible to have a virtual machine (vm) without a virtual machine monitor (vmm)/hypervisor, or if you have one virtual machine by default the logic which interfaces with the hardware is the vmm/hypervisor?

I am trying to understand if its the vm which does the sandboxing, or the vmm? and if it is the vmm, what does the vm do exactly- just provide the normal OS services?

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Running a program without its graphical user interface is sometimes referred to as running it headless.

Via Wikipedia: A headless system is a computer system or device that has been configured to operate without a monitor (the missing "head"), keyboard, and mouse.

So the same concepts may apply to a virtual machine, you just use an alternate way of connecting to it, like ssh, Remote Desktop, or whatever methods are available to you.

If I am understanding correctly the vmm/hypervisor would be lower than the Operating system it is servicing. So the virtual machine makes calls and everything like a normal program, it runs and when it needs something it makes requests like it would if it were the only OS. Then if there is a call for something the OS handles, then that command is handled by the VMM to change the instruction into an api call to the "real" os.

So yes, I believe the VM doesn't know anything about its circumstances, and the vmm is the virtualizer.

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Ok but my point is that the VM is exactly the same as a normal OS, its the VMM which does all the virtualization? – Leon Oct 6 '12 at 20:56

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