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Sorry for the ignorance, but what does this mean? I understand from the article that the patch allows the full Hyper-V stack to run on a linux-based machine (as opposed to previously needing windows to run the root partition). But what does _that_ mean to have the ability to run Hyper-V entirely on linux? Is it just a "good to have options" thing?

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It allows them to run a bare metal (type 1) hypervisor instead of a VM on top of Windows.

Hyper-V already is a bare metal (type 1) hypervisor. Admittedly it does use one (or more) of the guests, called the "parent partition", to handle some of the work for it. This change allows that parent partition to be Linux instead of Windows, but it does not make it any more of a bare metal hypervisor than it was before, unless you know something in addition to what the article says.

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