Jian and Hao, could you also help take a look at this patch?
This patch is ok to me.
Reviewed-by: Dandan Bi <[email protected]>
Thanks,
Dandan
> -----Original Message-----
> From: Gao, Liming
> Sent: Friday, August 16, 2019 11:40 PM
> To: [email protected]
> Cc: Mike Turner <[email protected]>; Wang, Jian J
> <[email protected]>; Wu, Hao A <[email protected]>; Bi, Dandan
> <[email protected]>; Laszlo Ersek <[email protected]>
> Subject: [patch v2][edk2-stable201908] MdeModulePkg DxeCore: Fix for
> missing Memory Attributes Table (MAT) update
>
> From: Mike Turner <[email protected]>
>
> The Fpdt driver (FirmwarePerformanceDxe) saves a memory address across
> reboots, and then does an AllocatePage for that memory address.
> If, on this boot, that memory comes from a Runtime memory bucket, the
> MAT table is not updated. This causes Windows to boot into Recovery.
>
> This patch blocks the memory manager from changing the page from a
> special bucket to a different memory type. Once the buckets are allocated,
> we freeze the memory ranges for the OS, and fragmenting the special
> buckets will cause errors resuming from hibernate (S4).
>
> The references to S4 here are the use case that fails. This failure is root
> caused to an inconsistent behavior of the core memory services themselves
> when type AllocateAddress is used.
>
> The main issue is apparently with the UEFI memory map -- the UEFI memory
> map reflects the pre-allocated bins, but the actual allocations at fixed
> addresses may go out of sync with that. Everything else, such as:
> - EFI_MEMORY_ATTRIBUTES_TABLE (page protections) being out of sync,
> - S4 failing
> are just symptoms / consequences.
>
> This patch is cherry pick from Project Mu:
> https://github.com/microsoft/mu_basecore/commit/a9be767d9be96af9401
> 6ebd391ea6f340920735a
> With the minor change,
> 1. Update commit message format to keep the message in 80 characters one
> line.
> 2. Remove // MU_CHANGE comments in source code.
> 3. Update comments style to follow edk2 style.
>
> Cc: Jian J Wang <[email protected]>
> Cc: Hao A Wu <[email protected]>
> Cc: Dandan Bi <[email protected]>
> Cc: Laszlo Ersek <[email protected]>
> Signed-off-by: Liming Gao <[email protected]>
> ---
> In v2, add more description for this issue.
>
> MdeModulePkg/Core/Dxe/Mem/Page.c | 41
> ++++++++++++++++++++++++++++++++++------
> 1 file changed, 35 insertions(+), 6 deletions(-)
>
> diff --git a/MdeModulePkg/Core/Dxe/Mem/Page.c
> b/MdeModulePkg/Core/Dxe/Mem/Page.c
> index bd9e116aa5..1f0e3d94b9 100644
> --- a/MdeModulePkg/Core/Dxe/Mem/Page.c
> +++ b/MdeModulePkg/Core/Dxe/Mem/Page.c
> @@ -1265,12 +1265,13 @@ CoreInternalAllocatePages (
> IN BOOLEAN NeedGuard
> )
> {
> - EFI_STATUS Status;
> - UINT64 Start;
> - UINT64 NumberOfBytes;
> - UINT64 End;
> - UINT64 MaxAddress;
> - UINTN Alignment;
> + EFI_STATUS Status;
> + UINT64 Start;
> + UINT64 NumberOfBytes;
> + UINT64 End;
> + UINT64 MaxAddress;
> + UINTN Alignment;
> + EFI_MEMORY_TYPE CheckType;
>
> if ((UINT32)Type >= MaxAllocateType) {
> return EFI_INVALID_PARAMETER;
> @@ -1321,6 +1322,7 @@ CoreInternalAllocatePages (
> // if (Start + NumberOfBytes) rolls over 0 or
> // if Start is above MAX_ALLOC_ADDRESS or
> // if End is above MAX_ALLOC_ADDRESS,
> + // if Start..End overlaps any tracked MemoryTypeStatistics range
> // return EFI_NOT_FOUND.
> //
> if (Type == AllocateAddress) {
> @@ -1336,6 +1338,33 @@ CoreInternalAllocatePages (
> (End > MaxAddress)) {
> return EFI_NOT_FOUND;
> }
> +
> + //
> + // A driver is allowed to call AllocatePages using an AllocateAddress
> type.
> This type of
> + // AllocatePage request the exact physical address if it is not used.
> The
> existing code
> + // will allow this request even in 'special' pages. The problem with
> this is
> that the
> + // reason to have 'special' pages for OS hibernate/resume is defeated as
> memory is
> + // fragmented.
> + //
> +
> + for (CheckType = (EFI_MEMORY_TYPE) 0; CheckType <
> EfiMaxMemoryType; CheckType++) {
> + if (MemoryType != CheckType &&
> + mMemoryTypeStatistics[CheckType].Special &&
> + mMemoryTypeStatistics[CheckType].NumberOfPages > 0) {
> + if (Start >= mMemoryTypeStatistics[CheckType].BaseAddress &&
> + Start <= mMemoryTypeStatistics[CheckType].MaximumAddress) {
> + return EFI_NOT_FOUND;
> + }
> + if (End >= mMemoryTypeStatistics[CheckType].BaseAddress &&
> + End <= mMemoryTypeStatistics[CheckType].MaximumAddress) {
> + return EFI_NOT_FOUND;
> + }
> + if (Start < mMemoryTypeStatistics[CheckType].BaseAddress &&
> + End > mMemoryTypeStatistics[CheckType].MaximumAddress) {
> + return EFI_NOT_FOUND;
> + }
> + }
> + }
> }
>
> if (Type == AllocateMaxAddress) {
> --
> 2.13.0.windows.1
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