[edk2-devel] [PATCH 0/6] Substract TME-MK KEY_ID_BITS from CPU max PA

[Gerd Hoffmann]

  Hi,

> For tdx, the actual max physical address bits is decreased by the KEY_ID_BITS bits.
> But the max physical address bits reported from CPUID instruction don't change.

I guess the physical address bits calculation for tdx needs adjustment
then.  Right now we have:

  if (TdIsEnabled ()) {
    if (TdSharedPageMask () == (1ULL << 47)) {
      PhysMemAddressWidth = 48;
    } else {
      PhysMemAddressWidth = 52;
    }
  }


See PlatformAddressWidthInitialization() in PlatformInitLib/MemDetect.c

Which would be the third place needing the same logic.  Maybe worth
thinking about a helper function in a library somewhere, so we don't
cut&paste the same code snippet again and again ...

take care,
  Gerd



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