RFC: https://bugzilla.tianocore.org/show_bug.cgi?id=3429
If IA32_ERER.NXE has already been set, skip setting it again.
Cc: Jian J Wang <jian.j.w...@intel.com>
Cc: Hao A Wu <hao.a...@intel.com>
Cc: Brijesh Singh <brijesh.si...@amd.com>
Cc: Erdem Aktas <erdemak...@google.com>
Cc: James Bottomley <j...@linux.ibm.com>
Cc: Jiewen Yao <jiewen....@intel.com>
Cc: Tom Lendacky <thomas.lenda...@amd.com>
Cc: Gerd Hoffmann <kra...@redhat.com>
Acked-by: Gerd Hoffmann <kra...@redhat.com>
Reviewed-by: Jian J Wang <jian.j.w...@intel.com>
Signed-off-by: Min Xu <min.m...@intel.com>
---
MdeModulePkg/Core/DxeIplPeim/X64/VirtualMemory.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/MdeModulePkg/Core/DxeIplPeim/X64/VirtualMemory.c
b/MdeModulePkg/Core/DxeIplPeim/X64/VirtualMemory.c
index 1ebab2782010..a451ca160408 100644
--- a/MdeModulePkg/Core/DxeIplPeim/X64/VirtualMemory.c
+++ b/MdeModulePkg/Core/DxeIplPeim/X64/VirtualMemory.c
@@ -179,9 +179,11 @@ EnableExecuteDisableBit (
{
UINT64 MsrRegisters;
- MsrRegisters = AsmReadMsr64 (0xC0000080);
- MsrRegisters |= BIT11;
- AsmWriteMsr64 (0xC0000080, MsrRegisters);
+ MsrRegisters = AsmReadMsr64 (0xC0000080);
+ if ((MsrRegisters & BIT11) == 0) {
+ MsrRegisters |= BIT11;
+ AsmWriteMsr64 (0xC0000080, MsrRegisters);
+ }
}
/**
--
2.29.2.windows.2
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