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[Xen-devel] Re: [RFC, PATCH 0/24] VMI i386 Linux virtualization interface proposal

Zachary Amsden wrote:
This is by no means finished work. A few of the areas that need more
attention and exploration are (a) 64bit support is still lacking, but we
feel a port of VMI to the 64 bit Linux can be done without too much
trouble (b) the Xen compatibility layer needs some work to bring it
up to the Xen 3.0 interfaces.  Work is underway on this already, and
no major issues are expected at this time.
Hi Zach,

Can you please post the Xen compatibility layer (even if it is for 2.0.x). I think it's important to see that code to understand the advantages/disadvantages compared to the existing Xen paravirtualization interface. Likewise, any Xen performance data would be useful as there has been some discussion about whether VMI would negatively impact Xen performance[1].


Anthony Liguori
Two final notes.  This is not an attempt to force a proprietary interface
into the Linux kernel.  This is an attempt to find a common interface
that can be used by many hypervisors by isolating hypervisor specific
idioms into a neutral layer.  This new layer is just what is claims to
be - a virtual machine interface, which allows hypervisor dependent code
to be abstracted in a way that benefits both Linux and hypervisor

This is also not an attempt to define an exact and final specification
of how virtualization should be done in Linux.  This is very much a work
in progress, and it is understood that the interfaces proposed here will
change in time to accommodate the needs of all interested parties. We hope to find a common solution that can eventually become part of the
Linux kernel and serve as a model for other operating systems as well.

We appreciate your feedback on this design and the patches to Linux, and
welcome working with anyone who is interested in making virtualization
in Linux a friendly environment to innovate in.  If you find the ideas
here interesting, please volunteer to help improve them.

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