[Xen-devel] xen/xen vs xen/kvm nesting with pv drivers

[Anthony Wright <anthony@xxxxxxxxxxxxxxx>]

I tried to install Xen (4.7.0 with linux 4.7.2 Dom0) on an AWS virtual machine 
and it failed because while AWS uses Xen it requires that you use the PVHVM 
network driver. I then tried to install Xen on a Google Cloud virtual machine 
and despite also requiring you to use PV drivers, that succeeded because Google 
Cloud uses KVM.

I think this means that if you nest Xen in KVM you can use high performance 
drivers, but if you nest Xen in Xen you have to use slower drivers, which seems 
to be the wrong way around!

I'd like to be able to install Xen on an AWS virtual machine, and wondered what 
are the challenges to getting the pv drivers working in a nested environment. 
Is this a problem with the Dom0 kernel only expecting there to be a single 
XenStore, or is there also a problem in Xen?

Thanks,

Anthony Wright

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