diff options
Diffstat (limited to 'OvmfPkg/ResetVector/Ia32/AmdSev.asm')
| -rw-r--r-- | OvmfPkg/ResetVector/Ia32/AmdSev.asm | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/OvmfPkg/ResetVector/Ia32/AmdSev.asm b/OvmfPkg/ResetVector/Ia32/AmdSev.asm index 23e4c5e..827c874 100644 --- a/OvmfPkg/ResetVector/Ia32/AmdSev.asm +++ b/OvmfPkg/ResetVector/Ia32/AmdSev.asm @@ -162,11 +162,14 @@ SevClearPageEncMaskForGhcbPage: ;
; The initial GHCB will live at GHCB_BASE and needs to be un-encrypted.
; This requires the 2MB page for this range be broken down into 512 4KB
- ; pages. All will be marked encrypted, except for the GHCB.
+ ; pages. All will be marked encrypted, except for the GHCB. Since the
+ ; original PMD entry is no longer a leaf entry, remove the encryption
+ ; bit when pointing to the PTE page.
;
mov ecx, (GHCB_BASE >> 21)
mov eax, GHCB_PT_ADDR + PAGE_PDP_ATTR
mov [ecx * 8 + PT_ADDR (0x2000)], eax
+ mov [ecx * 8 + PT_ADDR (0x2000) + 4], strict dword 0
;
; Page Table Entries (512 * 4KB entries => 2MB)
|