This patch-series implements paravirt-spinlock implementation for KVM guests,
based heavily on Xen's implementation. I tried to refactor Xen's spinlock
implementation to make it common for both Xen and KVM - but found that
few differences between Xen and KVM (Xen has the ability to block on a
particular event/irq for example) _and_ the fact that the guest kernel
can be compiled to support both Xen and KVM hypervisors (CONFIG_XEN and
CONFIG_KVM_GUEST can both be turned on) makes the "common" code a eye-sore.
There will have to be:
if (xen) {
...
} else if (kvm) {
..
}
or possibly:
alternative(NOP, some_xen_specific_call, ....)
type of code in the common implementation.