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The Xen Project
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The Xen Project
Xen is an open-source Type 1 hypervisor with a unique architecture based on a Microkernel design.
- Dom0 (Domain 0): The first VM that boots. It has special privileges to access hardware directly and manage other VMs. It usually runs Linux.
- DomU (Domain U): The unprivileged "User" domains (the actual guest VMs).
- Paravirtualization (PV): Historically, Xen was famous for PV, where the guest OS was modified to "know" it was virtualized, making it faster. Modern hardware (HVM) has made this less necessary, but the concept remains a core part of virtualization history.
- Legacy: Xen famously powered the original Amazon Web Services (AWS) EC2 fleet.