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Re: [Xen-users] Is Xen really a Type 1 Hypervisor?

Hello Eva,

I would consider Xen to be a type 1 Hypervisor, it runs directly on the hardware and manages resources.

Your friend may be misunderstanding Dom0 as a "host", but Dom0 is just a privileged control OS running ontop of the hypervisor ("second layer" if going by the description).

I tried ESXi, and switched to Xen specifically because the tiny built-in control OS doesn't support a myriad of consumer drivers, something that having a Linux control guest fixes.


On Mon, Apr 16, 2012 at 5:57 AM, eva <evammg@xxxxxxxxx> wrote:


I got into a debate about if xen is really a type 1 hypervisor. A friend said that Xen/KVM/Intel are not really type 1 hypervisor, that is, the "real" type 1 hypervisor is the one running with Sparc. (?)

How to know? Because if you reboot the Host, vm's keep running, that means, it's type 1. (?)

-- At this point, I am confused. Is he talking about HVM? Is he mixing HVM with type 1?

What I know it's what wikipedia and other xen related documents say about type 1, that is, the hypervisor is at the lowest level, next to the hardware, and controlled at an upper level by dom0.

He also says that there are not many differences between type 1 and type 2 in practice, when talking about the xen and kvm model as wikipedia describes it.

What do you think? Is he mistaken?


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