On Mon, Oct 21, 2019 at 04:28:23PM +0100, Steven Price wrote: > Enable paravirtualization features when running under a hypervisor > supporting the PV_TIME_ST hypercall. > > For each (v)CPU, we ask the hypervisor for the location of a shared > page which the hypervisor will use to report stolen time to us. We set > pv_time_ops to the stolen time function which simply reads the stolen > value from the shared page for a VCPU. We guarantee single-copy > atomicity using READ_ONCE which means we can also read the stolen > time for another VCPU than the currently running one while it is > potentially being updated by the hypervisor. > > Signed-off-by: Steven Price <steven.price@xxxxxxx> Acked-by: Catalin Marinas <catalin.marinas@xxxxxxx>
