On Mon, Mar 29, 2021, Kuppuswamy, Sathyanarayanan wrote: > > > On 3/29/21 4:23 PM, Andy Lutomirski wrote: > > > > > On Mar 29, 2021, at 4:17 PM, Kuppuswamy Sathyanarayanan > > > <sathyanarayanan.kuppusw...@linux.intel.com> wrote: > > > > > > In non-root TDX guest mode, MWAIT, MONITOR and WBINVD instructions > > > are not supported. So handle #VE due to these instructions > > > appropriately. > > > > Is there something I missed elsewhere in the code that checks CPL? > We don't check for CPL explicitly. But if we are reaching here, then we > executing these instructions with wrong CPL.
No, if these instructions take a #VE then they were executed at CPL=0. MONITOR and MWAIT will #UD without VM-Exit->#VE. Same for WBINVD, s/#UD/#GP.
