Do not use fixed CR4 value 0x668, change CR4.CET bit only.
Signed-off-by: Sheng Wei <w.sh...@intel.com>
Cc: Eric Dong <eric.d...@intel.com>
Cc: Ray Ni <ray...@intel.com>
Cc: Laszlo Ersek <ler...@redhat.com>
Cc: Wu Jiaxin <jiaxin...@intel.com>
Cc: Tan Dun <dun....@intel.com>
---
UefiCpuPkg/PiSmmCpuDxeSmm/Ia32/SmiEntry.nasm | 9 ++++++---
UefiCpuPkg/PiSmmCpuDxeSmm/X64/SmiEntry.nasm | 3 ++-
2 files changed, 8 insertions(+), 4 deletions(-)
diff --git a/UefiCpuPkg/PiSmmCpuDxeSmm/Ia32/SmiEntry.nasm
b/UefiCpuPkg/PiSmmCpuDxeSmm/Ia32/SmiEntry.nasm
index 68332e2c3f..a087576a54 100644
--- a/UefiCpuPkg/PiSmmCpuDxeSmm/Ia32/SmiEntry.nasm
+++ b/UefiCpuPkg/PiSmmCpuDxeSmm/Ia32/SmiEntry.nasm
@@ -260,7 +260,8 @@ CetInterruptDone:
bts ecx, 16 ; set WP
mov cr0, ecx
- mov eax, 0x668 | CR4_CET
+ mov eax, cr4
+ bts eax, CR4_CET_BIT
mov cr4, eax
setssbsy
@@ -292,8 +293,10 @@ CetDone:
xor edx, edx
wrmsr
- mov eax, 0x668
- mov cr4, eax ; disable CET
+ ; clear CR4.CET bit
+ mov eax, cr4
+ btr eax, CR4_CET_BIT
+ mov cr4, eax
mov ecx, MSR_IA32_PL0_SSP
pop eax
diff --git a/UefiCpuPkg/PiSmmCpuDxeSmm/X64/SmiEntry.nasm
b/UefiCpuPkg/PiSmmCpuDxeSmm/X64/SmiEntry.nasm
index 007fbff640..7aed7c8dda 100644
--- a/UefiCpuPkg/PiSmmCpuDxeSmm/X64/SmiEntry.nasm
+++ b/UefiCpuPkg/PiSmmCpuDxeSmm/X64/SmiEntry.nasm
@@ -287,7 +287,8 @@ CetInterruptDone:
bts ecx, 16 ; set WP
mov cr0, rcx
- mov eax, 0x668 | CR4_CET
+ mov rax, cr4
+ bts rax, CR4_CET_BIT
mov cr4, rax
setssbsy
--
2.26.2.windows.1
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