RE: [PATCH v2 03/21] x86/virt/tdx: Implement the SEAMCALL base function

[Tian, Kevin]

> From: Huang, Kai <kai.huang@xxxxxxxxx>
> Sent: Monday, March 28, 2022 9:42 AM
> 
> 
> >
> > >
> > > A CPU-attested software module (called the 'TDX module') runs in SEAM
> > > VMX root to manage the crypto protected VMs running in SEAM VMX
> non-
> > > root.
> > > SEAM VMX root is also used to host another CPU-attested software
> module
> > > (called the 'P-SEAMLDR') to load and update the TDX module.
> > >
> > > Host kernel transits to either the P-SEAMLDR or the TDX module via the
> > > new SEAMCALL instruction.  SEAMCALLs are host-side interface functions
> > > defined by the P-SEAMLDR and the TDX module around the new
> SEAMCALL
> > > instruction.  They are similar to a hypercall, except they are made by
> >
> > "SEAMCALLs are ... functions ... around the new SEAMCALL instruction"
> >
> > This is confusing. Probably just:
> 
> May I ask why is it confusing?

SEAMCALL is an instruction. One of its arguments carries the function
number.