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15
Privilege Rings
Xen runs at ring 0 (highest privilege)
All domains run at rings 1 - 3.
Kernel is ring 1
User-space is ring 3
Applications Applications
Kernel Kernel
Linux Kernel
domain 0
(management)
Hypervisor (XEN)
Physical Hardware
ring 3
ring 1
ring 0
Events
Hypercalls