Re: [RFC v2 27/32] x86/tdx: Exclude Shared bit from __PHYSICAL_MASK

[Kuppuswamy, Sathyanarayanan]

Hi Dave,

On 4/26/21 11:01 AM, Kuppuswamy Sathyanarayanan wrote:
> From: "Kirill A. Shutemov"<kirill.shutemov@xxxxxxxxxxxxxxx>
>
> tdx_shared_mask() returns the mask that has to be set in a page
> table entry to make page shared with VMM.
>
> Also, note that we cannot club shared mapping configuration between
> AMD SME and Intel TDX Guest platforms in common function. SME has
> to do it very early in __startup_64() as it sets the bit on all
> memory, except what is used for communication. TDX can postpone as
> we don't need any shared mapping in very early boot.
>
> Signed-off-by: Kirill A. Shutemov<kirill.shutemov@xxxxxxxxxxxxxxx>
> Reviewed-by: Andi Kleen<ak@xxxxxxxxxxxxxxx>
> Signed-off-by: Kuppuswamy Sathyanarayanan<sathyanarayanan.kuppuswamy@xxxxxxxxxxxxxxx>

Any comments on this patch?

--
Sathyanarayanan Kuppuswamy
Linux Kernel Developer