Re: [edk2-devel] [Patch V4] UefiCpuPkg:Limit PhysicalAddressBits in special case

["Gerd Hoffmann" <kraxel@redhat.com>]

  Hi,

> +  //
> +  // 4-level paging supports translating 48-bit linear addresses to 52-bit physical addresses.
> +  // Since linear addresses are sign-extended, the linear-address space of 4-level paging is:
> +  // [0, 2^47-1] and [0xffff8000_00000000, 0xffffffff_ffffffff].
> +  // So only [0, 2^47-1] linear-address range maps to the identical physical-address range when
> +  // 5-Level paging is disabled.
> +  //
> +  ASSERT (PhysicalAddressBits <= 52);
> +  if (!Is5LevelPagingNeeded && (PhysicalAddressBits > 47)) {
> +    PhysicalAddressBits = 47;
> +  }

Nice.
Reviewed-by: Gerd Hoffmann <kraxel@redhat.com>

take care,
  Gerd



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