On 03/05/2018 14:13, Alexander Shishkin wrote: >>>> New function __pt_cap_get() will be invoked in KVM to check if a >>>> specific capability is availiable in KVM guest. >>>> Another function pt_cap_get() can only check the hardware capabilities >>>> but this may different with KVM guest because some features may not be >>>> exposed to guest. >>> Do we really need both in KVM? >> Yes, KVM need get host capability to estimate if can expose this feature >> to guest > Can you elaborate on this, what information do we need besides > MSR_IA32_VMX_MISC[14]? It needs all the CPUID data, and it's nice to query it in a more manageable form than with bit shifts. Paolo
