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SubjectRe: frequent lockups in 3.18rc4
On Fri, Nov 21, 2014 at 11:46:57AM -0800, Linus Torvalds wrote:

> Anybody who seriously does virtualization uses hw virtualization that
> is much better than it used to be. And the non-serious users aren't
> that performance-sensitive by definition.
> I note that the Fedora kernel config seems to include paravirt by
> default, so you get a lot of the crazy overheads..

I'm not sure how many people actually use paravirt these days,
but the reason Fedora has it enabled still at least is probably

config KVM_GUEST
bool "KVM Guest support (including kvmclock)"
depends on PARAVIRT

But tbh I've not looked at this stuff since it first got merged.
Will a full-virt system kvm boot a guest without KVM_GUEST enabled ?
(ie, is this just an optimisation for the paravirt case?)

I'm not a heavy virt user, so I don't even remember how a lot of
this stuff is supposed to work.


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