cloud - Why Xen needs Domain0(the first host virtual machine that starts when Xen boots up) -

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why xen hypervisor needs domain0? why can't communicate hardware through xen, xen os in physical machine, why can't work on xen instead of creating domain0 handle i/o communication , managing rest of vms(domainus).

what's point? it's have microsoft office on windows 7 computer, , want have windows 7 vm running on windows 7 computer, , use microsoft office in virtual windows 7.

the xen philosophy have minimum functionality possible handle safe execution of multiple vm on system. xen handles cpu , memory management, while leaves out i/o operations dom0 do. facilitates communication between domu (a normal vm) , dom0. thus, xen in sense not operating system.

the minimum-functionality "principle" ensures xen not exposed driver-related bugs (which occur frequently) , extremely reliable.


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