> Assuming you're running both of my patches (LOAD_EFER regardless of
> nx, but skip LOAD_EFER of guest == host), then some of the speedup may
> be just less code running. I haven't figured out exactly when
> vmx_save_host_state runs, but my patches avoid a call to
> kvm_set_shared_msr, which is worth a few cycles.
Yes, that's possible. vmx_save_host_state is here:
preempt_disable();
kvm_x86_ops->prepare_guest_switch(vcpu); // <<<<
if (vcpu->fpu_active)
kvm_load_guest_fpu(vcpu);
kvm_load_guest_xcr0(vcpu);
vcpu->mode = IN_GUEST_MODE;
srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
and it's a fairly hot function.
Paolo
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