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IntelSiliconPkg IntelVTdDxe: Fix flush cache issue

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The patch fixes flush cache issue in
CreateSecondLevelPagingEntryTable().

We found some video cards still not work even they have
been added to the exception list.

In CreateSecondLevelPagingEntryTable(), the check
"(BaseAddress >= MemoryLimit)" may be TRUE and "goto Done"
will be executed, then the FlushPageTableMemory operations
at the end of the function will be skipped.

Instead of "goto Done", this patch uses "break" to break
the for loops, then the FlushPageTableMemory operations
at the end of the function could have opportunity to be
executed.

The patch also fixes a miscalculation for Lvl3End.

Cc: Jiewen Yao <jiewen.yao@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Star Zeng <star.zeng@intel.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>
This commit is contained in:
Star Zeng
2018-01-17 18:31:29 +08:00
parent 748cd9a680
commit bac7f02365
1 changed files with 9 additions and 4 deletions
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13
IntelSiliconPkg/Feature/VTd/IntelVTdDxe/TranslationTable.c
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@ -1,6 +1,6 @@
/** @file
Copyright (c) 2017, Intel Corporation. All rights reserved.<BR>
Copyright (c) 2017 - 2018, Intel Corporation. All rights reserved.<BR>
This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution. The full text of the license may be found at
@ -226,7 +226,7 @@ CreateSecondLevelPagingEntryTable (
Lvl3Start = RShiftU64 (BaseAddress, 30) & 0x1FF;
if (ALIGN_VALUE_LOW(BaseAddress + SIZE_1GB, SIZE_1GB) <= EndAddress) {
Lvl3End = SIZE_4KB/sizeof(VTD_SECOND_LEVEL_PAGING_ENTRY);
Lvl3End = SIZE_4KB/sizeof(VTD_SECOND_LEVEL_PAGING_ENTRY) - 1;
} else {
Lvl3End = RShiftU64 (EndAddress - 1, 30) & 0x1FF;
}
@ -252,16 +252,21 @@ CreateSecondLevelPagingEntryTable (
Lvl2PtEntry[Index2].Bits.PageSize = 1;
BaseAddress += SIZE_2MB;
if (BaseAddress >= MemoryLimit) {
goto Done;
break;
}
}
FlushPageTableMemory (VtdIndex, (UINTN)Lvl2PtEntry, SIZE_4KB);
if (BaseAddress >= MemoryLimit) {
break;
}
}
FlushPageTableMemory (VtdIndex, (UINTN)&Lvl3PtEntry[Lvl3Start], (UINTN)&Lvl3PtEntry[Lvl3End + 1] - (UINTN)&Lvl3PtEntry[Lvl3Start]);
if (BaseAddress >= MemoryLimit) {
break;
}
}
FlushPageTableMemory (VtdIndex, (UINTN)&Lvl4PtEntry[Lvl4Start], (UINTN)&Lvl4PtEntry[Lvl4End + 1] - (UINTN)&Lvl4PtEntry[Lvl4Start]);
Done:
return SecondLevelPagingEntry;
}