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Xen 3.0 Virtualization Interface Guide
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2.1 CPU state

All privileged state must be handled by Xen. The guest OS has no direct access to CR3 and is not permitted to update privileged bits in EFLAGS. Guest OSes use hypercalls to invoke operations in Xen; these are analogous to system calls but occur from ring 1 to ring 0.

A list of all hypercalls is given in Appendix A.

Xen 3.0 Virtualization Interface Guide
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