Re: [PATCH v3 1/1] x86/tdx: Handle MWAIT, MONITOR and WBINVD

[Andy Lutomirski]

> On Mar 29, 2021, at 7:04 PM, Andi Kleen <ak@xxxxxxxxxxxxxxx> wrote:
> 
> 
>> 
>>> 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.
>> 
>> Dare I ask about XSETBV?
> 
> XGETBV does not cause a #VE, it just works normally. The guest has full
> AVX capabilities.
> 

X *SET* BV