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OvmfPkg/ResetVector: wire up 5-level paging for TDX 

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>
Message-Id: <20240301074402.98625-9-kraxel@redhat.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
[lersek@redhat.com: move "CheckForSev:" label into "%if PG_5_LEVEL" scope,
 as discussed with Gerd]
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Oliver Steffen <osteffen@redhat.com>
Cc: Michael Roth <michael.roth@amd.com>
Cc: Erdem Aktas <erdemaktas@google.com>
Cc: Min Xu <min.m.xu@intel.com>
Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
[lersek@redhat.com: turn the "Cc:" message headers from Gerd's on-list
 posting into "Cc:" tags in the commit message, in order to pacify
 "PatchCheck.py"]
This commit is contained in:
Gerd Hoffmann 2024-03-01 08:44:00 +01:00 committed by mergify[bot]
parent 318b0d714a
commit 275d0a39c4
2 changed files with 28 additions and 1 deletions
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13
OvmfPkg/ResetVector/Ia32/IntelTdx.asm
View File

@ -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
;

16
OvmfPkg/ResetVector/Ia32/PageTables64.asm
View File

@ -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 +215,13 @@ SetCr3ForPageTables64:
je TdxBspInit
cmp eax, TDX_AP
je SetCr3
%if PG_5_LEVEL
cmp eax, TDX_AP_5_LEVEL
jne CheckForSev
Enable5LevelPaging
jmp SetCr3
CheckForSev:
%endif
; Check whether the SEV is active and populate the SevEsWorkArea
OneTimeCall CheckSevFeatures
@ -253,6 +261,14 @@ TdxBspInit:
; TDX BSP workflow
;
ClearOvmfPageTables
%if PG_5_LEVEL
Check5LevelPaging Tdx4Level
CreatePageTables5Level 0
OneTimeCall TdxPostBuildPageTables5Level
Enable5LevelPaging
jmp SetCr3
Tdx4Level:
%endif
CreatePageTables4Level 0
OneTimeCall TdxPostBuildPageTables
jmp SetCr3