RE: [Xen-devel] [PATCH 20 of 20] n2 MSR handling and capability exposure

["Dong, Eddie" <eddie.dong@xxxxxxxxx>]

> 
> Oh, I forgot to say: will this feature-blacklisting work over live
> migration to a machine with a different CPU?  There isn't an equivalnet
> of the CPUID masking feature to make all the machines in a cluster seem
> to have the same VMX features.

That seems to be an issue neutral to nested virtualization. We should be able 
to migrate among same processors. But it is difficult to migrate a L2 guest to 
other machine as L1 guest. It may be OK evnetually, but not addressed right now.

My understanding is that same CPUID doesn't mean exactly same capability. 

> 
> Elsewhere we use whitelisting for passsing hardware capability flags to
> HVM guests; I think we should use whitelists here too.
> 

Thx, Eddie

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