On 04/05/2018 12:23, Alexander Shishkin wrote: >> Currently, Intel Processor Trace do not support tracing in L1 guest >> VMX operation(IA32_VMX_MISC[bit 14] is 0). As mentioned in SDM, > I don't understand this patch. You mention VMX_MISC[14] here, but I > can't see anything related to it in the code. This is talking about the _guest_'s view of IA32_VMX_MISC. The code does nothing to set it, so the patch does what the commit message says below: >> on these type of processors, execution of the VMXON instruction will >> clears IA32_RTIT_CTL.TraceEn and any attempt to write IA32_RTIT_CTL >> causes a general-protection exception (#GP). >> >> Signed-off-by: Luwei Kang <luwei.kang@xxxxxxxxx> Thanks, Paolo
