On Wed, Jul 31, 2013 at 05:17:35AM -0700, H. Peter Anvin wrote: > 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
PV MMU parts specifically. > 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 > > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majord...@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
