2018-03-16 15:22+0100, Vitaly Kuznetsov: > Enlightened VMCS is just a structure in memory, the main benefit > besides avoiding somewhat slower VMREAD/VMWRITE is using clean field > mask: we tell the underlying hypervisor which fields were modified > since VMEXIT so there's no need to inspect them all. > > Tight CPUID loop test shows significant speedup: > Before: 18890 cycles > After: 8304 cycles > > Static key is being used to avoid performance penalty for non-Hyper-V > deployments. > > Signed-off-by: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx> > --- Looks good, thanks. Reviewed-by: Radim Krčmář <rkrcmar@xxxxxxxxxx>
