Alan Cox wrote:
Ar Iau, 2006-08-03 am 15:31 -0700, ysgrifennodd Zachary Amsden:
Alan Cox wrote:
Could have fooled me. It seems to work for the IBM Mainframe people
really well.
Yes, but not because of source compatibility. It works because the
hypervisor layer is actually architected in the hardware.
The hardware has nothing to do with it. It works because the hypervisor
API has a spec and is maintained compatibly. Its not entirely hardware
architected either, it has chunks of interfaces that are not present
hardware level or not meaningful at that level - the paging assists for
example are purely a hypervisor interface as are hipersockets.
Yes, it's part hardware, part software, a pseudo firmwarish mesh of the
two. When you've got multiple vendors involved, you need to paint the
interface with a broader stroke so that the individual details of each
don't get so involved, and you can do that in many different ways. You
still need an ABI, not just an API, though, for future compatibility of
existing kernels, which is important to mainframe customers for
migration as well as virtual machine users.
But I think we're running off into the weeds picking nits here..
Zach
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