Re: [edk2-devel] [PATCH] UefiCpuPkg: Fix issue that IsModified is wrongly set in PageTableMap

["Ni, Ray" <ray.ni@intel.com>]

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

Thanks,
Ray
> -----Original Message-----
> From: Liu, Zhiguang <zhiguang.liu@intel.com>
> Sent: Wednesday, January 10, 2024 1:38 PM
> To: devel@edk2.groups.io
> Cc: Liu, Zhiguang <zhiguang.liu@intel.com>; Ni, Ray <ray.ni@intel.com>; Laszlo
> Ersek <lersek@redhat.com>; Kumar, Rahul R <rahul.r.kumar@intel.com>; Gerd
> Hoffmann <kraxel@redhat.com>; Lee, Crystal <crystalLee@ami.com.tw>
> Subject: [PATCH] UefiCpuPkg: Fix issue that IsModified is wrongly set in
> PageTableMap
> 
> REF: https://bugzilla.tianocore.org/show_bug.cgi?id=4614
> 
> Fix issue that IsModified is wrongly set in PageTableMap.
> 
> Cc: Ray Ni <ray.ni@intel.com>
> Cc: Laszlo Ersek <lersek@redhat.com>
> Cc: Rahul Kumar <rahul1.kumar@intel.com>
> Cc: Gerd Hoffmann <kraxel@redhat.com>
> Cc: Crystal Lee <CrystalLee@ami.com.tw>
> Signed-off-by: Zhiguang Liu <zhiguang.liu@intel.com>
> ---
>  UefiCpuPkg/Library/CpuPageTableLib/CpuPageTableMap.c | 10 ++++++++--
>  1 file changed, 8 insertions(+), 2 deletions(-)
> 
> diff --git a/UefiCpuPkg/Library/CpuPageTableLib/CpuPageTableMap.c
> b/UefiCpuPkg/Library/CpuPageTableLib/CpuPageTableMap.c
> index 36b2c4e6a3..164187f151 100644
> --- a/UefiCpuPkg/Library/CpuPageTableLib/CpuPageTableMap.c
> +++ b/UefiCpuPkg/Library/CpuPageTableLib/CpuPageTableMap.c
> @@ -567,7 +567,10 @@ PageTableLibMapInLevel (
>          OriginalCurrentPagingEntry.Uint64 = CurrentPagingEntry->Uint64;
>          PageTableLibSetPle (Level, CurrentPagingEntry, Offset, Attribute,
> &CurrentMask);
> 
> -        if (OriginalCurrentPagingEntry.Uint64 != CurrentPagingEntry->Uint64) {
> +        if (Modify && (OriginalCurrentPagingEntry.Uint64 != CurrentPagingEntry-
> >Uint64)) {
> +          //
> +          // The page table entry can be changed by this function only when
> Modify is true.
> +          //
>            *IsModified = TRUE;
>          }
>        }
> @@ -609,7 +612,10 @@ PageTableLibMapInLevel (
>    // Check if ParentPagingEntry entry is modified here is enough. Except the
> changes happen in leaf PagingEntry during
>    // the while loop, if there is any other change happens in page table, the
> ParentPagingEntry must has been modified.
>    //
> -  if (OriginalParentPagingEntry.Uint64 != ParentPagingEntry->Uint64) {
> +  if (Modify && (OriginalParentPagingEntry.Uint64 != ParentPagingEntry-
> >Uint64)) {
> +    //
> +    // The page table entry can be changed by this function only when Modify
> is true.
> +    //
>      *IsModified = TRUE;
>    }
> 
> --
> 2.31.1.windows.1



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