Messages in this thread | | | Date | Wed, 31 Jul 2013 05:17:35 -0700 | From | "H. Peter Anvin" <> | Subject | Re: [QUERY] lguest64 |
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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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