From c1cab54ce57c2608b8b3ea051c7041f036f21153 Mon Sep 17 00:00:00 2001 From: Jian J Wang Date: Sat, 16 Sep 2017 21:26:28 +0800 Subject: [PATCH] UefiCpuPkg/CpuDxe: Fix out-of-sync issue in page attributes From CpuDxe driver perspective, it doesn't update GCD memory attributes from current page table setup during its initialization. So the memory attributes in GCD might not reflect all memory attributes in real world. Cc: Eric Dong Cc: Jiewen Yao Cc: Star Zeng Cc: Laszlo Ersek Cc: Michael Kinney Suggested-by: Jiewen Yao Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Jian J Wang Reviewed-by: Jiewen Yao --- UefiCpuPkg/CpuDxe/CpuDxe.c | 5 ++ UefiCpuPkg/CpuDxe/CpuDxe.h | 9 +++ UefiCpuPkg/CpuDxe/CpuPageTable.c | 99 ++++++++++++++++++++++++++++++++ 3 files changed, 113 insertions(+) diff --git a/UefiCpuPkg/CpuDxe/CpuDxe.c b/UefiCpuPkg/CpuDxe/CpuDxe.c index b386f3b677..4e8fa100e0 100644 --- a/UefiCpuPkg/CpuDxe/CpuDxe.c +++ b/UefiCpuPkg/CpuDxe/CpuDxe.c @@ -863,6 +863,11 @@ RefreshGcdMemoryAttributes ( FreePool (MemorySpaceMap); } + // + // Update page attributes + // + RefreshGcdMemoryAttributesFromPaging(); + mIsFlushingGCD = FALSE; } diff --git a/UefiCpuPkg/CpuDxe/CpuDxe.h b/UefiCpuPkg/CpuDxe/CpuDxe.h index 4861abee76..a25b35c6eb 100644 --- a/UefiCpuPkg/CpuDxe/CpuDxe.h +++ b/UefiCpuPkg/CpuDxe/CpuDxe.h @@ -52,6 +52,10 @@ EFI_MEMORY_UCE \ ) +#define EFI_MEMORY_PAGETYPE_MASK (EFI_MEMORY_RP | \ + EFI_MEMORY_XP | \ + EFI_MEMORY_RO \ + ) /** Flush CPU data cache. If the instruction cache is fully coherent @@ -261,5 +265,10 @@ SetDataSelectors ( UINT16 Selector ); +VOID +RefreshGcdMemoryAttributesFromPaging ( + VOID + ); + #endif diff --git a/UefiCpuPkg/CpuDxe/CpuPageTable.c b/UefiCpuPkg/CpuDxe/CpuPageTable.c index 2c61e7503e..ae93f3f553 100644 --- a/UefiCpuPkg/CpuDxe/CpuPageTable.c +++ b/UefiCpuPkg/CpuDxe/CpuPageTable.c @@ -23,6 +23,8 @@ #include #include #include + +#include "CpuDxe.h" #include "CpuPageTable.h" /// @@ -767,6 +769,103 @@ AssignMemoryPageAttributes ( return Status; } +/** + Update GCD memory space attributes according to current page table setup. +**/ +VOID +RefreshGcdMemoryAttributesFromPaging ( + VOID + ) +{ + EFI_STATUS Status; + UINTN NumberOfDescriptors; + EFI_GCD_MEMORY_SPACE_DESCRIPTOR *MemorySpaceMap; + PAGE_TABLE_LIB_PAGING_CONTEXT PagingContext; + PAGE_ATTRIBUTE PageAttribute; + UINT64 *PageEntry; + UINT64 PageLength; + UINT64 MemorySpaceLength; + UINT64 Length; + UINT64 BaseAddress; + UINT64 PageStartAddress; + UINT64 Attributes; + UINT64 Capabilities; + BOOLEAN DoUpdate; + UINTN Index; + + // + // Assuming that memory space map returned is sorted already; otherwise sort + // them in the order of lowest address to highest address. + // + Status = gDS->GetMemorySpaceMap (&NumberOfDescriptors, &MemorySpaceMap); + ASSERT_EFI_ERROR (Status); + + GetCurrentPagingContext (&PagingContext); + + BaseAddress = 0; + PageLength = 0; + for (Index = 0; Index < NumberOfDescriptors; Index++) { + if (MemorySpaceMap[Index].GcdMemoryType == EfiGcdMemoryTypeNonExistent) { + continue; + } + + if (MemorySpaceMap[Index].BaseAddress >= (BaseAddress + PageLength)) { + // + // Current memory space starts at a new page. Resetting PageLength will + // trigger a retrieval of page attributes at new address. + // + PageLength = 0; + } else { + // + // In case current memory space is not adjacent to last one + // + PageLength -= (MemorySpaceMap[Index].BaseAddress - BaseAddress); + } + + // Sync real page attributes to GCD + BaseAddress = MemorySpaceMap[Index].BaseAddress; + MemorySpaceLength = MemorySpaceMap[Index].Length; + while (MemorySpaceLength > 0) { + if (PageLength == 0) { + PageEntry = GetPageTableEntry (&PagingContext, BaseAddress, &PageAttribute); + if (PageEntry == NULL) { + break; + } + + // + // Note current memory space might start in the middle of a page + // + PageStartAddress = (*PageEntry) & (UINT64)PageAttributeToMask(PageAttribute); + PageLength = PageAttributeToLength (PageAttribute) - (BaseAddress - PageStartAddress); + Attributes = GetAttributesFromPageEntry (PageEntry); + + if (Attributes != (MemorySpaceMap[Index].Attributes & EFI_MEMORY_PAGETYPE_MASK)) { + DoUpdate = TRUE; + Attributes |= (MemorySpaceMap[Index].Attributes & ~EFI_MEMORY_PAGETYPE_MASK); + Capabilities = Attributes | MemorySpaceMap[Index].Capabilities; + } else { + DoUpdate = FALSE; + } + } + + Length = MIN (PageLength, MemorySpaceLength); + if (DoUpdate) { + gDS->SetMemorySpaceCapabilities (BaseAddress, Length, Capabilities); + gDS->SetMemorySpaceAttributes (BaseAddress, Length, Attributes); + DEBUG ((DEBUG_INFO, "Update memory space attribute: [%02d] %016lx - %016lx (%08lx -> %08lx)\r\n", + Index, BaseAddress, BaseAddress + Length - 1, + MemorySpaceMap[Index].Attributes, Attributes)); + } + + PageLength -= Length; + MemorySpaceLength -= Length; + BaseAddress += Length; + } + } + + FreePool (MemorySpaceMap); +} + /** Initialize the Page Table lib. **/ -- 2.39.2