Re: [Xen-devel] Xen and VMware

[Jacob Gorm Hansen <jacobg@xxxxxxx>]

Steven Hand wrote:

> > VMWare does some amount of paravirtualization, with all the VMWare tools 
> > that you need to install. In fact, Xen seems to be going in VMWare's 
> > direction (shadow page tables, writable page tables, binary rewriting, 
> > Vanderpool support) in some areas.
> Hmm: 
>
>   - our shadow page tables are quite different to VMware's (as far as 
>     we can tell - there's no docs on their implementation details) 
>
>   - I don't think that writable page tables are something VMWare do 
>     since it only makes sense for paravirtualized memory systems.
>   - our binary rewriting is a tiny fraction of what they do and, in 
>     current default installs of xen 2.x, is not used at all. 
>
>   - we released VT support back in 2004; I don't believe VMWare 
>     ship anything supporting VT at present. 
What I meant by that is that where Xen1 was purely in the paravirt camp, 
recent versions take more of a middle-of-the road stance, as Xen now 
sports functionality that does not strictly _have_ to be in the VMM, and 
does so in order to reduce the porting effort for new guest OSes.
Jacob


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