On Mon, Sep 04, 2017 at 04:28:36PM +0200, Oscar Salvador wrote: > This is just a resend of Waiman Long's patch. > I could not find why it was not merged to upstream, so I thought > to give it another chance. > What follows is what Waiman Long wrote. > > Xen has an kernel command line argument "xen_nopvspin" to disable > paravirtual spinlocks. This patch adds a similar "kvm_nopvspin" > argument to disable paravirtual spinlocks for KVM. This can be useful > for testing as well as allowing administrators to choose unfair lock > for their KVM guests if they want to. For testing its trivial to hack your kernel and I don't feel this is something an Admin can make reasonable decisions about. So why? In general less knobs is better.
