> > > > 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]? Enable Intel PT in guest depend on SECONDARY_EXEC_PT_USE_GPA, EPT, MSR_IA32_VMX_MISC[14] and the capability of " PT_CAP_topa_output" on hardware. PT driver will return " -ENODEV" if hardware not support "PT_CAP_topa_output". Thanks, Luwei Kang > > Thanks, > -- > Alex
