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

[Zachary Amsden <zach@xxxxxxxxxx>]

Arjan van de Ven wrote:
> > makes debugging and 
> > development easier,
> >     
> that I don't buy; a fixed interface tends to make debugging harder not
> easier since you can't change it to add more information
This we find to be quite true.  Now, you can use a VMI kernel, make 
changes to it, run it on native hardware, and be confident that it will 
run properly in a VM as well.  And you can develop in a VM, with 
confidence that you can run on native hardware.  You can even replace 
the entire "ROM" image with your own custom debugging image to add any 
type of debugging or performance monitoring facility you want - and you 
have some very, very interesting hook points into the kernel that make 
that task much more achievable.

> that I buy for binary only hypervisors. But in an open source world I'll
> buy this a LOT less as being relevant.
>   
This is not about the open source versus the closed source world.  It is 
about the real world, where customers want to make as few changes as 
possible to a working and already deployed system.  If they have to 
recompile a kernel just to get their system to run again, that is a pain 
point that is easily avoided.

Zach

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