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    SubjectRe: [QUERY] lguest64
    On 07/31/2013 02:39 AM, Mike Rapoport wrote:
    >
    > The use case I had in mind is to use lguest as a nested hypervisor in
    > public clouds. As of today, major public clouds do not support nested
    > virtualization and it's not clear at all if they will expose this
    > ability in their deployments. Addition of 64-bit support for lguest
    > won't require changes to pvops and, as far as I can tell, won't change
    > the number of pvops users...
    >

    "We can add a pvops user and that won't change the number of pvops
    users" What?!

    >> Yes, the subset of x86-64 machines for which there isn't hardware
    >> virtualization support is pretty uninteresting.
    >
    > There are plenty virtual machines in EC2, Rackspace, HP and other
    > clouds that do not have hardware virtualization. I believe that
    > running a hypervisor on them may be pretty interesting.

    The big problem with pvops is that they are a permanent tax on future
    development -- a classic case of "the hooks problem." As such it is
    important that there be a real, significant, use case with enough users
    to make the pain worthwhile. With Xen looking at sunsetting PV support
    with a long horizon, it might currently be possible to remove pvops some
    time in the early 2020s or so timeframe. Introducing and promoting a
    new user now would definitely make that impossible.

    So it matters that the use case be real.

    -hpa



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