Good catch.
Reviewed-by: jiewen....@intel.com
> -----Original Message-----
> From: Zeng, Star
> Sent: Wednesday, January 17, 2018 7:57 PM
> To: edk2-devel@lists.01.org
> Cc: Zeng, Star <star.z...@intel.com>; Yao, Jiewen <jiewen....@intel.com>
> Subject: [PATCH] IntelSiliconPkg IntelVTdDxe: Fix DMA does not work issue
>
> Fix DMA does not work issue when system memory is not
> greater than 4G.
>
> Cc: Jiewen Yao <jiewen....@intel.com>
> Contributed-under: TianoCore Contribution Agreement 1.1
> Signed-off-by: Star Zeng <star.z...@intel.com>
> ---
> IntelSiliconPkg/Feature/VTd/IntelVTdDxe/TranslationTable.c | 11 +++++++----
> 1 file changed, 7 insertions(+), 4 deletions(-)
>
> diff --git a/IntelSiliconPkg/Feature/VTd/IntelVTdDxe/TranslationTable.c
> b/IntelSiliconPkg/Feature/VTd/IntelVTdDxe/TranslationTable.c
> index cecb5d23efbf..7f64d5e418f6 100644
> --- a/IntelSiliconPkg/Feature/VTd/IntelVTdDxe/TranslationTable.c
> +++ b/IntelSiliconPkg/Feature/VTd/IntelVTdDxe/TranslationTable.c
> @@ -286,11 +286,14 @@ CreateSecondLevelPagingEntry (
> if (SecondLevelPagingEntry == NULL) {
> return NULL;
> }
> - SecondLevelPagingEntry = CreateSecondLevelPagingEntryTable (VtdIndex,
> SecondLevelPagingEntry, SIZE_4GB, mAbove4GMemoryLimit, IoMmuAccess);
> - if (SecondLevelPagingEntry == NULL) {
> - return NULL;
> - }
>
> + if (mAbove4GMemoryLimit != 0) {
> + ASSERT (mAbove4GMemoryLimit > BASE_4GB);
> + SecondLevelPagingEntry = CreateSecondLevelPagingEntryTable (VtdIndex,
> SecondLevelPagingEntry, SIZE_4GB, mAbove4GMemoryLimit, IoMmuAccess);
> + if (SecondLevelPagingEntry == NULL) {
> + return NULL;
> + }
> + }
> return SecondLevelPagingEntry;
> }
>
> --
> 2.7.0.windows.1
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