[Xen-devel] Does Xen also plan to move the back-end driver to the stub domain for HVM?

["Liang Yang" <multisyncfe991@xxxxxxxxxxx>]

Hi,

Based on the roadmap on Xen summit, there is a plan to move QEMU and let it 
run on the stub domain to improve HVM performance. However, comparing with 
QEMU device model, it will be much easier to move BE driver and let it run 
in stub domain instead of dom0 as BE part is running on the kernel space 
(QEMU is running on user space).
but I'm little bit confused about the relationship between stub domain and 
guest domain. Is the stub domain part of guest domain? Does each guest 
domain have a stub domain which is created when the guest domain is created?
If the stub domain is part of guest domain, does porting device model to 
stub domain compromise the orginial design purpose of isoloated devide 
domain?
Thanks,

Liang



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