Branch: refs/heads/master
Home: https://github.com/tianocore/edk2
Commit: cb3f41a9378822a0bcf0febf898af254b4994b8d
https://github.com/tianocore/edk2/commit/cb3f41a9378822a0bcf0febf898af254b4994b8d
Author: Yuanhao Xie <[email protected]>
Date: 2023-11-27 (Mon, 27 Nov 2023)
Changed paths:
M UefiCpuPkg/Library/MpInitLib/MpLib.c
M UefiCpuPkg/Library/MpInitLib/MpLib.h
Log Message:
-----------
UefiCpuPkg/MpInitLib: Enable execute disable bit.
This patch synchronizes the No-Execute bit in the IA32_EFER
register for the APs before the RestoreVolatileRegisters operation.
The commit 964a4f0, titled "Eliminate the second INIT-SIPI-SIPI
sequence," replaces the second INIT-SIPI-SIPI sequence with the BSP
calling the SwitchApContext function to initiate a specialized start-up
signal, waking up APs in the DXE instead of using INIT-SIPI-SIPI.
Due to this change, the logic for "Enable execute disable bit" in
MpFuncs.nasm is no longer executed. However, to ensure the proper setup
of the page table, it is necessary to synchronize the IA32_EFER.NXE for
APs before executing RestoreVolatileRegisters .
Based on SDM:
If IA32_EFER.NXE is set to 1, it signifies execute-disable, meaning
instruction fetches are not allowed from the 4-KByte page controlled by
this entry. Conversely, if it is set to 0, it is reserved.
Signed-off-by: Yuanhao Xie <[email protected]>
Reviewed-by: Laszlo Ersek <[email protected]>
Reviewed-by: Ray Ni <[email protected]>
Cc: Laszlo Ersek [email protected]
Cc: Eric Dong <[email protected]>
Cc: Ray Ni <[email protected]>
Cc: Rahul Kumar <[email protected]>
Cc: Gerd Hoffmann <[email protected]>
Commit: 33e31c289cc7b417f110d6da70dc8224443d32d3
https://github.com/tianocore/edk2/commit/33e31c289cc7b417f110d6da70dc8224443d32d3
Author: xieyuanh <[email protected]>
Date: 2023-11-27 (Mon, 27 Nov 2023)
Changed paths:
M UefiCpuPkg/Library/MpInitLib/MpEqu.inc
M UefiCpuPkg/Library/MpInitLib/MpLib.h
Log Message:
-----------
UefiCpuPkg/MpInitLib: Update the comments of _CPU_MP_DATA.
No functional changes in this patch.
Updates the comments of _CPU_MP_DATA to delcared that duplications in
CpuMpData are present to avoid to be direct accessed and comprehended
in assembly code. CpuMpData: Intended for use in C code while
ExchangeInfo are used in assembly code in this module.
This patch deletes the unnecessary comments in CpuMpData, since
CpuMpData is no longer responsible for passing information from PEI to
DXE.
Signed-off-by: Yuanhao Xie <[email protected]>
Cc: Laszlo Ersek [email protected]
Cc: Eric Dong <[email protected]>
Cc: Ray Ni <[email protected]>
Cc: Rahul Kumar <[email protected]>
Cc: Gerd Hoffmann <[email protected]>
Compare: https://github.com/tianocore/edk2/compare/8736b8fdca85...33e31c289cc7
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