Re: [PATCH v2 2/3] KVM: vmx: Emulate MSR IA32_UMWAIT_CONTROL

[Paolo Bonzini]

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