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MdeModulePkg/DxeIpl: Remove clearing CR0.WP when protecting pagetable

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Remove clearing CR0.WP when marking the memory used for page table
as read-only in the page table itself created by DxeIpl. This page
table address is written to Cr3 after these protection steps. Till
this, the memory used for page table is always RW.

Signed-off-by: Dun Tan <dun.tan@intel.com>
Cc: Dandan Bi <dandan.bi@intel.com>
Cc: Liming Gao <gaoliming@byosoft.com.cn>
Reviewed-by: Ray Ni <ray.ni@intel.com>
This commit is contained in:
Dun Tan 2022-07-26 22:13:40 +08:00 committed by mergify[bot]
parent 7b4754904e
commit 62391b4ce9
1 changed files with 1 additions and 6 deletions
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7
MdeModulePkg/Core/DxeIplPeim/X64/VirtualMemory.c
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@ -626,12 +626,7 @@ EnablePageTableProtection (
}
//
// Disable write protection, because we need to mark page table to be write
// protected.
//
AsmWriteCr0 (AsmReadCr0 () & ~CR0_WP);
//
// No need to clear CR0.WP since PageTableBase has't been written to CR3 yet.
// SetPageTablePoolReadOnly might update mPageTablePool. It's safer to
// remember original one in advance.
//