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OvmfPkg/MemEncryptSevLib: Address range encryption state interface

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BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=3108

Update the MemEncryptSevLib library to include an interface that can
report the encryption state on a range of memory. The values will
represent the range as being unencrypted, encrypted, a mix of unencrypted
and encrypted, and error (e.g. ranges that aren't mapped).

Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Ard Biesheuvel <ard.biesheuvel@arm.com>
Cc: Brijesh Singh <brijesh.singh@amd.com>
Acked-by: Laszlo Ersek <lersek@redhat.com>
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Message-Id: <0d98f4d42a2b67310c29bac7bcdcf1eda6835847.1610045305.git.thomas.lendacky@amd.com>
This commit is contained in:
Tom Lendacky
2021-01-07 12:48:22 -06:00
committed by mergify[bot]
parent a746ca5b47
commit c330af0246
10 changed files with 368 additions and 12 deletions
Download Patch File Download Diff File Expand all files Collapse all files

19
OvmfPkg/Library/BaseMemEncryptSevLib/X64/PeiDxeVirtualMemory.c
View File

@ -28,14 +28,14 @@ typedef enum {
} MAP_RANGE_MODE;
/**
Get the memory encryption mask
Return the pagetable memory encryption mask.
@param[out] EncryptionMask contains the pte mask.
@return The pagetable memory encryption mask.
**/
STATIC
UINT64
GetMemEncryptionAddressMask (
EFIAPI
InternalGetMemEncryptionAddressMask (
VOID
)
{
@ -200,7 +200,7 @@ Split2MPageTo4K (
PageTableEntry1 = PageTableEntry;
AddressEncMask = GetMemEncryptionAddressMask ();
AddressEncMask = InternalGetMemEncryptionAddressMask ();
ASSERT (PageTableEntry != NULL);
ASSERT (*PageEntry2M & AddressEncMask);
@ -286,7 +286,7 @@ SetPageTablePoolReadOnly (
LevelSize[3] = SIZE_1GB;
LevelSize[4] = SIZE_512GB;
AddressEncMask = GetMemEncryptionAddressMask();
AddressEncMask = InternalGetMemEncryptionAddressMask();
PageTable = (UINT64 *)(UINTN)PageTableBase;
PoolUnitSize = PAGE_TABLE_POOL_UNIT_SIZE;
@ -431,7 +431,7 @@ Split1GPageTo2M (
PageDirectoryEntry = AllocatePageTableMemory(1);
AddressEncMask = GetMemEncryptionAddressMask ();
AddressEncMask = InternalGetMemEncryptionAddressMask ();
ASSERT (PageDirectoryEntry != NULL);
ASSERT (*PageEntry1G & AddressEncMask);
//
@ -485,7 +485,7 @@ SetOrClearCBit(
{
UINT64 AddressEncMask;
AddressEncMask = GetMemEncryptionAddressMask ();
AddressEncMask = InternalGetMemEncryptionAddressMask ();
if (Mode == SetCBit) {
*PageTablePointer |= AddressEncMask;
@ -527,6 +527,7 @@ DisableReadOnlyPageWriteProtect (
/**
Enable Write Protect on pages marked as read-only.
**/
STATIC
VOID
EnableReadOnlyPageWriteProtect (
VOID
@ -605,7 +606,7 @@ SetMemoryEncDec (
//
// Check if we have a valid memory encryption mask
//
AddressEncMask = GetMemEncryptionAddressMask ();
AddressEncMask = InternalGetMemEncryptionAddressMask ();
if (!AddressEncMask) {
return RETURN_ACCESS_DENIED;
}