On 21 Oct 2015, at 14:02 , Kevin Elphinstone <[email protected]> 
wrote:
>
> BTW, Dhammika's use case was paravirtualised Linux, which is now better 
> handled by CPU hardware extensions on ARM and x86.

… but points to a general use case: One of the attractions of clean object 
capability models is that any operation can be transparently virtualised. If an 
original cap can be derived, but a derived one cannot, then this breaks 
transparency at some point.

There’s the old saying that in CS there are only three valid constants: zero, 
one and infinity. We have a two in there, which clearly smells badly.

Gernot

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