Hello,
I'm reading an excellent documentation about virtualisation in embedded system.
(available on open kernel labs site)
I have read these things : (It talks about managing drivers in a virtualization
system)
"A straight virtualization approach can accomodate this by running the device
the device driver inside the VMM. This requires porting all drivers to the
hypervisor environnement , with no reuse of guest os driver"
A much better approach is to share a single driver between multiple vms,
without including it in the hypervisor. This requires that ecah participating
subsytem has a device modem for which it has a device driver. Typically, the
real device driver is contained in one of the participating system, but a
better (safer) solution is to separate it out into in own subsystem"
I want to know how it works on xen.
I think that :
All drivers are in the hypervisor, when a guest requires to use a device,
guest uses drivers which has been rewriten for xen in order to contact the
hypervisor. Then, the hypervisor which has all real drivers (not modified) call
the real device ?
or that :
The real device driver is contained in the dom0 system, the dom0 manage driver
for all domU.
I have three questions :
1 - Which is the good scenario ? (if one is good ) :o)
2 - If drivers for guests are rewritten to call hypervisor or dom0 instead of
the device directly, who devellops driver ?
(xen devellopers ? or developper for kernel mainline)
3- Which is the real utility of dom0 system ? (just I/O and administration of
virtual machines)
Last question, is someone have find a good white paper or doc which explains
how xen works ?
(and where i can find probably answers for my questions ??)
Thanks for all this details.
Best regards
Patrick Archibal
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