On 24/05/19 09:56, Tao Xu wrote: > + > + if (rdmsrl_safe(MSR_IA32_UMWAIT_CONTROL, &host_umwait_control)) > + return; > + Does the host value ever change? If not, this can perhaps be read once when kvm_intel is loaded. And if it changes often, it should be shadowed into a percpu variable. Paolo
