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[Xen-devel] Re: [RFC, PATCH 5/24] i386 Vmi code patching

* Daniel Arai (arai@xxxxxxxxxx) wrote:
> To elaborate a bit more, the "ROM" layer is "published" by the hypervisor.  
> This layer of abstraction will let you take a VMI-compiled kernel and run 
> it efficiently on any hypervisor that exports a VMI interface - even one 
> that you didn't know about (or didn't exist) when you compiled your kernel.
> If the ROM part is compiled into the code, then you have to compile in 
> support for the specific hypervisor(s) you want to run on.  It might be 
> reasonable for this code to be in a lodable kernel module, rather than a 
> device ROM per se, but you still want that kernel module to be provided by 
> the hypervisor.

I don't agree.  That module may know how to get interface info from a
vdso analog (just like a driver knows the hardware details of the device
it's interacting with, but the core kernel api is unaware), but placing
the binary compatibility on the kernel proper is wrong IMO.


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