[edk2-devel] [PATCH V4 05/31] OvmfPkg: Extend VmgExitLib to handle #VE exception

[Min Xu]

Hi
> > The base VmgExitLib library provides a default limited interface to
> > handle #VE exception. To provide full support, the OVMF version of
> > VmgExitLib is extended to provide full support of #VE handler.
> >
> > PcdIgnoreVeHalt is created in OvmfPkg.dec to ignore the VE halt.
> 
> Why this is useful?
This Pcd is deprecated. It will be removed in the next version.
> 
> > +  X64/TdVmcallCpuid.nasm
> 
> Hmm, why not simply call the functions added by patch #2?
> 
TdVmcall in patch #2 assumes the returned value is in r11 (if there is returned data). But from [GHCI] spec Table 3-17, TDVMCALL_CPUID returns the values in R12/R13/R14/R15. So there has to be a new TdVmcallCpuid.nasm.
[GHCI] https://www.intel.com/content/dam/develop/external/us/en/documents/intel-tdx-guest-hypervisor-communication-interface-1.0-344426-002.pdf

Thanks
Min


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