For the case CPU logic index is 0, RSP points to the very top of all AP
stacks. That address is not mapped in page table.
Cc: Guo Dong <guo.d...@intel.com>
Cc: Ray Ni <ray...@intel.com>
Cc: Sean Rhodes <sean@starlabs.systems>
Cc: James Lu <james...@intel.com>
Cc: Gua Guo <gua....@intel.com>
Signed-off-by: Ted Kuo <ted....@intel.com>
---
UefiCpuPkg/Library/MpInitLib/X64/MpFuncs.nasm | 1 +
1 file changed, 1 insertion(+)
diff --git a/UefiCpuPkg/Library/MpInitLib/X64/MpFuncs.nasm
b/UefiCpuPkg/Library/MpInitLib/X64/MpFuncs.nasm
index 9ebe31795b..5bcdf7726b 100644
--- a/UefiCpuPkg/Library/MpInitLib/X64/MpFuncs.nasm
+++ b/UefiCpuPkg/Library/MpInitLib/X64/MpFuncs.nasm
@@ -315,6 +315,7 @@ MwaitCheckGeneric:
MwaitLoopGeneric:
cli
mov rax, rsp ; Set Monitor Address
+ sub eax, 8 ; To ensure the monitor address is in the
page table
xor ecx, ecx ; ecx = 0
xor edx, edx ; edx = 0
monitor
--
2.39.1.windows.1
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