[edk2-devel] [Patch V4 05/21] UefiCpuPkg/CpuPageTableLib:Clear PageSize bit(Bit7) for non-leaf

[Ni, Ray]

Reviewed-by: Ray Ni <ray.ni at intel.com>

> -----Original Message-----
> From: Tan, Dun <dun.tan at intel.com>
> Sent: Thursday, March 23, 2023 3:41 PM
> To: devel at edk2.groups.io
> Cc: Dong, Eric <eric.dong at intel.com>; Ni, Ray <ray.ni at intel.com>; Kumar,
> Rahul R <rahul.r.kumar at intel.com>; Gerd Hoffmann <kraxel at redhat.com>
> Subject: [Patch V4 05/21] UefiCpuPkg/CpuPageTableLib:Clear PageSize
> bit(Bit7) for non-leaf
> 
> Clear PageSize bit(Bit7) for non-leaf entry in PageTableLibSetPnle.
> This function is used to set non-leaf entry attributes so it should
> make sure that the PageSize bit of the entry should be 0.
> 
> Signed-off-by: Dun Tan <dun.tan at intel.com>
> Cc: Eric Dong <eric.dong at intel.com>
> Cc: Ray Ni <ray.ni at intel.com>
> Cc: Rahul Kumar <rahul1.kumar at intel.com>
> Cc: Gerd Hoffmann <kraxel at redhat.com>
> ---
>  UefiCpuPkg/Library/CpuPageTableLib/CpuPageTableMap.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/UefiCpuPkg/Library/CpuPageTableLib/CpuPageTableMap.c
> b/UefiCpuPkg/Library/CpuPageTableLib/CpuPageTableMap.c
> index ad68792ca8..cf0cfeca77 100644
> --- a/UefiCpuPkg/Library/CpuPageTableLib/CpuPageTableMap.c
> +++ b/UefiCpuPkg/Library/CpuPageTableLib/CpuPageTableMap.c
> @@ -202,7 +202,8 @@ PageTableLibSetPnle (
>      Pnle->Bits.Nx = Attribute->Bits.Nx;
>    }
> 
> -  Pnle->Bits.Accessed = 0;
> +  Pnle->Bits.Accessed   = 0;
> +  Pnle->Bits.MustBeZero = 0;
> 
>    //
>    // Set the attributes (WT, CD, A) to 0.
> --
> 2.31.1.windows.1



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