[Xen-devel] Re: [patch 00/21] Xen-paravirt: Xen guest implementation for paravirt_ops interface

[Zachary Amsden <zach@xxxxxxxxxx>]

Christoph Lameter wrote:
> On Sat, 17 Feb 2007, Andi Kleen wrote:
>
>   
> > That was always its intention. It's not a direct interface to a hypervisor,
> > but an somewhat abstracted interface to a "hypervisor driver" 
> >     
> I thought that hypervisor driver was some binary blob that can be directly
> accessed via paravirt_ops?
>   
There are no more binary blobs being used by paravirt-ops hypervisors.  
I prefer the term "open hypercode layer".

> > But you're right that there are currently still quite a lot of hooks
> > being added. I plan to be much more strict on that in the future.
> >     
> And it seems that the hooks are not generic but bound to a particular 
> hypervisor. Should the Xen specific stuff not be in the binary blob?
>   
Xen doesn't use a hypercode layer, and there is no way to do what they 
need to do without hooks in the kernel.
Zach

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