[edk2-devel] [PATCH V6 33/42] OvmfPkg: Update PlatformInitLib for Tdx guest to publish ram regions

[Gerd Hoffmann]

  Hi,

> Another update is in PlatformAddressWidthInitialization. The physical
> address width that Tdx guest supports is either 48 or 52.

Hmm.  Sure this is correct?

48 is the max _virtual_ address space possible with 4-level paging.
The _physical_ address space might be much smaller, like this
(kaby lake desktop system):

    # lscpu
    Architecture:            x86_64
      CPU op-mode(s):        32-bit, 64-bit
      Address sizes:         39 bits physical, 48 bits virtual
      Byte Order:            Little Endian

Maybe all TDX-capable Intel CPUs actually have >= 48 bits physical,
so this could be fine, but please double-check.

thanks,
  Gerd



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