On 03/05/2018 14:30, Kang, Luwei wrote: >> 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". I actually don't understand why PT_CAP_topa_output matters for the purpose of enabling PT in the guest. However you still need __pt_cap_get() in the CPUID checks. Paolo
