diff options
| -rw-r--r-- | OvmfPkg/Library/BaseMemEncryptSevLib/X64/PeiDxeVirtualMemory.c | 27 |
1 files changed, 18 insertions, 9 deletions
diff --git a/OvmfPkg/Library/BaseMemEncryptSevLib/X64/PeiDxeVirtualMemory.c b/OvmfPkg/Library/BaseMemEncryptSevLib/X64/PeiDxeVirtualMemory.c index a1f6e61c1e..cf2441b551 100644 --- a/OvmfPkg/Library/BaseMemEncryptSevLib/X64/PeiDxeVirtualMemory.c +++ b/OvmfPkg/Library/BaseMemEncryptSevLib/X64/PeiDxeVirtualMemory.c @@ -548,6 +548,7 @@ InternalMemEncryptSevCreateIdentityMap1G ( PAGE_MAP_AND_DIRECTORY_POINTER *PageMapLevel4Entry;
PAGE_TABLE_1G_ENTRY *PageDirectory1GEntry;
UINT64 PgTableMask;
+ UINT64 *NewPageTable;
UINT64 AddressEncMask;
BOOLEAN IsWpEnabled;
RETURN_STATUS Status;
@@ -602,15 +603,23 @@ InternalMemEncryptSevCreateIdentityMap1G ( PageMapLevel4Entry = (VOID *)(Cr3BaseAddress & ~PgTableMask);
PageMapLevel4Entry += PML4_OFFSET (PhysicalAddress);
if (!PageMapLevel4Entry->Bits.Present) {
- DEBUG ((
- DEBUG_ERROR,
- "%a:%a: bad PML4 for Physical=0x%Lx\n",
- gEfiCallerBaseName,
- __func__,
- PhysicalAddress
- ));
- Status = RETURN_NO_MAPPING;
- goto Done;
+ NewPageTable = AllocatePageTableMemory (1);
+ if (NewPageTable == NULL) {
+ DEBUG ((
+ DEBUG_ERROR,
+ "%a:%a: failed to allocate a new PML4 entry\n",
+ gEfiCallerBaseName,
+ __func__
+ ));
+ Status = RETURN_NO_MAPPING;
+ goto Done;
+ }
+
+ SetMem (NewPageTable, EFI_PAGE_SIZE, 0);
+ PageMapLevel4Entry->Uint64 = (UINT64)(UINTN)NewPageTable | AddressEncMask;
+ PageMapLevel4Entry->Bits.MustBeZero = 0;
+ PageMapLevel4Entry->Bits.ReadWrite = 1;
+ PageMapLevel4Entry->Bits.Present = 1;
}
PageDirectory1GEntry = (VOID *)(
|