[edk2-devel] [PATCH 08/10] OvmfPkg/ResetVector: wire up 5-level paging for TDX

["Gerd Hoffmann" <kraxel@redhat.com>]

BSP workflow is quite simliar to the non-coco case.

TDX_WORK_AREA_PGTBL_READY is used to record the paging mode:
  1 == 4-level paging
  2 == 5-level paging

APs will look at TDX_WORK_AREA_PGTBL_READY to figure whenever
they should enable 5-level paging or not.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 OvmfPkg/ResetVector/Ia32/IntelTdx.asm     | 13 ++++++++++++-
 OvmfPkg/ResetVector/Ia32/PageTables64.asm | 12 ++++++++++++
 2 files changed, 24 insertions(+), 1 deletion(-)

diff --git a/OvmfPkg/ResetVector/Ia32/IntelTdx.asm b/OvmfPkg/ResetVector/Ia32/IntelTdx.asm
index c6b86019dfb9..7d775591a05b 100644
--- a/OvmfPkg/ResetVector/Ia32/IntelTdx.asm
+++ b/OvmfPkg/ResetVector/Ia32/IntelTdx.asm
@@ -179,7 +179,7 @@ InitTdx:
 ;
 ; Modified:  EAX, EDX
 ;
-; 0-NonTdx, 1-TdxBsp, 2-TdxAps
+; 0-NonTdx, 1-TdxBsp, 2-TdxAps, 3-TdxAps5Level
 ;
 CheckTdxFeaturesBeforeBuildPagetables:
     xor     eax, eax
@@ -200,6 +200,17 @@ TdxPostBuildPageTables:
     mov     byte[TDX_WORK_AREA_PGTBL_READY], 1
     OneTimeCallRet TdxPostBuildPageTables
 
+%if PG_5_LEVEL
+
+;
+; Set byte[TDX_WORK_AREA_PGTBL_READY] to 2
+;
+TdxPostBuildPageTables5Level:
+    mov     byte[TDX_WORK_AREA_PGTBL_READY], 2
+    OneTimeCallRet TdxPostBuildPageTables5Level
+
+%endif
+
 ;
 ; Check if TDX is enabled
 ;
diff --git a/OvmfPkg/ResetVector/Ia32/PageTables64.asm b/OvmfPkg/ResetVector/Ia32/PageTables64.asm
index d736db028277..ada3dc0ffbe0 100644
--- a/OvmfPkg/ResetVector/Ia32/PageTables64.asm
+++ b/OvmfPkg/ResetVector/Ia32/PageTables64.asm
@@ -44,6 +44,7 @@ BITS    32
 
 %define TDX_BSP         1
 %define TDX_AP          2
+%define TDX_AP_5_LEVEL  3
 
 ;
 ; For OVMF, build some initial page tables at
@@ -214,6 +215,10 @@ SetCr3ForPageTables64:
     je        TdxBspInit
     cmp       eax, TDX_AP
     je        SetCr3
+%if PG_5_LEVEL
+    cmp       eax, TDX_AP_5_LEVEL
+    je        SetCr3La57
+%endif
 
     ; Check whether the SEV is active and populate the SevEsWorkArea
     OneTimeCall   CheckSevFeatures
@@ -252,6 +257,13 @@ TdxBspInit:
     ; TDX BSP workflow
     ;
     ClearOvmfPageTables
+%if PG_5_LEVEL
+    Check5LevelPaging Tdx4Level
+    CreatePageTables5Level 0
+    OneTimeCall TdxPostBuildPageTables5Level
+    jmp SetCr3La57
+Tdx4Level:
+%endif
     CreatePageTables4Level 0
     OneTimeCall TdxPostBuildPageTables
     jmp SetCr3
-- 
2.43.2



-=-=-=-=-=-=-=-=-=-=-=-
Groups.io Links: You receive all messages sent to this group.
View/Reply Online (#115808): https://edk2.groups.io/g/devel/message/115808
Mute This Topic: https://groups.io/mt/104506795/7686176
Group Owner: devel+owner@edk2.groups.io
Unsubscribe: https://edk2.groups.io/g/devel/unsub [rebecca@openfw.io]
-=-=-=-=-=-=-=-=-=-=-=-