mirror of
https://github.com/acidanthera/audk.git
synced 2025-04-08 17:05:09 +02:00
b721aa749b
Commit 2ac1730bf2a5 (MdeModulePkg/DxeIpl: Mark page table as read-only) sets the memory pages used for page table as read-only after paging is setup and sets CR0.WP to protect CPU modifying the read-only pages. The commit causes #PF when MemEncryptSevClearPageEncMask() or MemEncryptSevSetPageEncMask() tries to change the page-table attributes. This patch takes the similar approach as Commit 147fd35c3e38 (UefiCpuPkg/CpuDxe: Enable protection for newly added page table). When page table protection is enabled, we disable it temporarily before changing the page table attributes. This patch makes use of the same approach as Commit 2ac1730bf2a5 (MdeModulePkg/DxeIpl: Mark page table as read-only)) for allocating page table memory from reserved memory pool, which helps to reduce a potential "split" operation. The patch duplicates code from commit 147fd35c3e38. The code duplication will be removed after we implement page table manipulation library. See bugzilla https://bugzilla.tianocore.org/show_bug.cgi?id=847. Cc: Jian J Wang <jian.j.wang@intel.com> Cc: Jiewen Yao <jiewen.yao@intel.com> Cc: Jordan Justen <jordan.l.justen@intel.com> Cc: Laszlo Ersek <lersek@redhat.com> Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org> Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Brijesh Singh <brijesh.singh@amd.com> Acked-by: Laszlo Ersek <lersek@redhat.com>
EDK II Project
A modern, feature-rich, cross-platform firmware development environment for the UEFI and PI specifications from www.uefi.org.
Contributions to the EDK II open source project are covered by the TianoCore Contribution Agreement 1.1
The majority of the content in the EDK II open source project uses a BSD 2-Clause License. The EDK II open source project contains the following components that are covered by additional licenses:
- AppPkg/Applications/Python/Python-2.7.2/Tools/pybench
- AppPkg/Applications/Python/Python-2.7.2
- AppPkg/Applications/Python/Python-2.7.10
- BaseTools/Source/C/BrotliCompress
- MdeModulePkg/Library/BrotliCustomDecompressLib
- OvmfPkg
- CryptoPkg/Library/OpensslLib/openssl
The EDK II Project is composed of packages. The maintainers for each package are listed in Maintainers.txt.