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Xen 3.0 Virtualization Interface Guide
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3.7 Start of Day

The start-of-day environment for guest operating systems is rather different to that provided by the underlying hardware. In particular, the processor is already executing in protected mode with paging enabled.

Domain 0 is created and booted by Xen itself. For all subsequent domains, the analogue of the boot-loader is the domain builder, user-space software running in domain 0. The domain builder is responsible for building the initial page tables for a domain and loading its kernel image at the appropriate virtual address.

Xen 3.0 Virtualization Interface Guide
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  Published under the terms of the GNU General Public License Design by Interspire