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From: "duntan" <dun.tan@intel.com>
To: devel@edk2.groups.io
Cc: Ray Ni <ray.ni@intel.com>, Laszlo Ersek <lersek@redhat.com>,
	Rahul Kumar <rahul1.kumar@intel.com>,
	Gerd Hoffmann <kraxel@redhat.com>,
	Jiaxin Wu <jiaxin.wu@intel.com>
Subject: [edk2-devel] [PATCH 11/18] UefiCpuPkg: Disable PG in IA32 ApLoopCode
Date: Fri, 10 May 2024 18:08:20 +0800	[thread overview]
Message-ID: <20240510100827.1903-12-dun.tan@intel.com> (raw)
In-Reply-To: <20240510100827.1903-1-dun.tan@intel.com>

Disable paging in IA32 RelocateApLoop assembly
code to fix the issue that the AP page table is
unavailiable after boot OS under IA32 execution mode.

This issue exist in IA32 PEI + IA32 DXE normal boot
(also S3 boot with IA32 PEI after previous three commits
are accepted). In current MpLib code, the IA32 execution
mode code did not create page table in reserved memory
like what X64 code did. If PcdCpuStackGuard is TRUE, the
PG is enabled for AP in current RelocateApLoop assembly
code. And the page table for AP is unavailiable after
boot OS. This might cause potential issue. So disable PG
in IA32 RelocateApLoop.

Signed-off-by: Dun Tan <dun.tan@intel.com>
Cc: Ray Ni <ray.ni@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Rahul Kumar <rahul1.kumar@intel.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: Jiaxin Wu <jiaxin.wu@intel.com>
---
 UefiCpuPkg/Library/MpInitLib/Ia32/MpFuncs.nasm | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/UefiCpuPkg/Library/MpInitLib/Ia32/MpFuncs.nasm b/UefiCpuPkg/Library/MpInitLib/Ia32/MpFuncs.nasm
index d117f09ef5..75b18ce56f 100644
--- a/UefiCpuPkg/Library/MpInitLib/Ia32/MpFuncs.nasm
+++ b/UefiCpuPkg/Library/MpInitLib/Ia32/MpFuncs.nasm
@@ -225,6 +225,10 @@ RendezvousFunnelProcEnd:
 ;  specific to SEV-ES support and are not applicable on IA32.
 ;-------------------------------------------------------------------------------------
 AsmRelocateApLoopGenericStart:
+    mov        eax, cr0
+    btr        eax, 31             ; Clear CR0.PG
+    mov        cr0, eax            ; Disable paging since the page table might be unavailiable
+
     mov        eax, esp
     mov        esp, [eax + 12]     ; TopOfApStack
     push       dword [eax]         ; push return address for stack trace
-- 
2.31.1.windows.1



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  parent reply	other threads:[~2024-05-10 10:09 UTC|newest]

Thread overview: 46+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-05-10 10:08 [edk2-devel] [PATCH 00/19] Remove some S3 related code in CpuS3.c of smm cpu driver duntan
2024-05-10 10:08 ` [edk2-devel] [PATCH 01/18] MdeModulePkg: Add gEdkiiS3MtrrSettingGuid duntan
2024-05-13  2:07   ` Ni, Ray
2024-05-10 10:08 ` [edk2-devel] [PATCH 02/18] OvmfPkg: Save MTRR by lockbox in CpuS3DataDxe duntan
2024-05-13  2:07   ` Ni, Ray
2024-05-20  7:43   ` Ard Biesheuvel
2024-05-10 10:08 ` [edk2-devel] [PATCH 03/18] UefiCpuPkg: Add locbox lib instance in DSC duntan
2024-05-13  2:07   ` Ni, Ray
2024-05-10 10:08 ` [edk2-devel] [PATCH 04/18] UefiCpuPkg: Save MTRR by lockbox in CpuS3DataDxe duntan
2024-05-13  2:07   ` Ni, Ray
2024-05-13  3:04   ` Wu, Jiaxin
2024-05-13  3:37     ` duntan
2024-05-10 10:08 ` [edk2-devel] [PATCH 05/18] UefiCpuPkg: LoadMtrrData for all cpu in S3Resume duntan
2024-05-13  2:07   ` Ni, Ray
2024-05-10 10:08 ` [edk2-devel] [PATCH 06/18] UefiCpuPkg: Remove the duplicated mpservice locate duntan
2024-05-13  2:07   ` Ni, Ray
2024-05-10 10:08 ` [edk2-devel] [PATCH 07/18] UefiCpuPkg: Install gEdkiiEndOfS3ResumeGuid in S3Resume duntan
2024-05-10 10:08 ` [edk2-devel] [PATCH 08/18] UefiCpuPkg:Abstract some DxeMpLib code to function duntan
2024-05-13  2:13   ` Ni, Ray
2024-05-10 10:08 ` [edk2-devel] [PATCH 09/18] UefiCpuPkg:Move some code in DxeMpLib to common place duntan
2024-05-13  2:16   ` Ni, Ray
2024-05-10 10:08 ` [edk2-devel] [PATCH 10/18] UefiCpuPkg:Relocate AP to new safe buffer in PeiMpLib duntan
2024-05-13  2:23   ` Ni, Ray
2024-05-13 11:07   ` Gerd Hoffmann
2024-05-14  5:17     ` Ni, Ray
2024-05-14  6:51       ` Gerd Hoffmann
2024-05-10 10:08 ` duntan [this message]
2024-05-13  2:25   ` [edk2-devel] [PATCH 11/18] UefiCpuPkg: Disable PG in IA32 ApLoopCode Ni, Ray
2024-05-10 10:08 ` [edk2-devel] [PATCH 12/18] UefiCpuPkg: Remove code to load mtrr setting duntan
2024-05-13  2:25   ` Ni, Ray
2024-05-10 10:08 ` [edk2-devel] [PATCH 13/18] UefiCpuPkg:Set PcdCpuFeaturesInitOnS3Resume to TRUE duntan
2024-05-13  2:26   ` Ni, Ray
2024-05-10 10:08 ` [edk2-devel] [PATCH 14/18] UefiCpuPkg: Remove code to set register table duntan
2024-05-13  2:26   ` Ni, Ray
2024-05-10 10:08 ` [edk2-devel] [PATCH 15/18] UefiCpuPkg:Remove code to handle APIC setting and Interrupt duntan
2024-05-13  2:27   ` Ni, Ray
2024-05-10 10:08 ` [edk2-devel] [PATCH 16/18] UefiCpuPkg:Remove code to wakeup AP and relocate ap duntan
2024-05-13  2:32   ` Ni, Ray
2024-05-10 10:08 ` [edk2-devel] [PATCH 17/18] UefiCpuPkg: Remove GetAcpiCpuData() in CpuS3.c duntan
2024-05-13  2:33   ` Ni, Ray
2024-05-10 10:08 ` [edk2-devel] [PATCH 18/18] MdeModulePkg:Remove MpService2Ppi field in SMM_S3_RESUME_STATE duntan
2024-05-13  2:35   ` Ni, Ray
2024-05-13  3:38     ` duntan
2024-05-13  2:48 ` [edk2-devel] [PATCH 00/19] Remove some S3 related code in CpuS3.c of smm cpu driver Wu, Jiaxin
2024-05-13  3:37   ` duntan
2024-05-13  6:00     ` Ni, Ray

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