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/** @file
IGVM Parameter parsing
Copyright (c) 2025, Red Hat. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <Base.h>
#include <PiPei.h>
#include <IndustryStandard/IgvmData.h>
#include <Library/BaseLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/HobLib.h>
#include <Library/PlatformInitLib.h>
#include <Library/DebugLib.h>
#include <Pi/PiHob.h>
/* keep in sync with OvmfPkg/ResetVector/X64/IgvmMetadata.asm */
#define MEMORY_MAP_OFFSET 0
#define MEMORY_MAP_ENTRIES 8
#define MEMORY_MAP_SIZE (MEMORY_MAP_ENTRIES * sizeof(IGVM_MEMORY_MAP_ENTRY))
#define VP_COUNT_OFFSET (MEMORY_MAP_OFFSET + MEMORY_MAP_SIZE)
#define VP_COUNT_SIZE 16
#define IGVM_MM_ENTRY_TYPE_MEMORY 0x00
#define IGVM_MM_ENTRY_TYPE_RESERVED 0x01
#define IGVM_MM_ENTRY_TYPE_PERSISTENT 0x02
typedef struct IGVM_MEMORY_MAP_ENTRY {
UINT64 PageStart;
UINT64 PageCount;
UINT16 EntryType;
UINT16 EntryFlags;
UINT32 Reserved;
} IGVM_MEMORY_MAP_ENTRY;
STATIC BOOLEAN mIgvmParamsInvalid;
STATIC
IGVM_MEMORY_MAP_ENTRY *
EFIAPI
PlatformIgvmMemoryMapFind (
VOID
)
{
UINT64 Address;
IGVM_MEMORY_MAP_ENTRY *Map;
if (mIgvmParamsInvalid) {
return NULL;
}
Address = FixedPcdGet64 (PcdOvmfIgvmParamBase);
if (Address == 0) {
// no parameter area
return NULL;
}
Map = (VOID *)(UINTN)(Address + MEMORY_MAP_OFFSET);
if (Map[0].PageCount == 0) {
// no memory map entries
return NULL;
}
if ((Map[0].EntryType & 0xfff0) ||
(Map[0].Reserved != 0))
{
DEBUG ((DEBUG_INFO, "%a: memory map sanity check failed, ignoring\n", __func__));
mIgvmParamsInvalid = TRUE;
return NULL;
}
return Map;
}
VOID
EFIAPI
PlatformIgvmParamReserve (
VOID
)
{
UINT64 Base;
UINT64 Size;
Base = FixedPcdGet64 (PcdOvmfIgvmParamBase);
Size = FixedPcdGet64 (PcdOvmfIgvmParamSize);
if (Base && Size) {
//
// Reserve igvm parameter area as runtime data, to make sure the OS isn't
// going to use it, otherwise we can get corrupted IGVM parameters after
// guest reboot.
//
DEBUG ((DEBUG_INFO, "%a: 0x%x +0x%x\n", __func__, Base, Size));
BuildMemoryAllocationHob (
Base,
Size,
EfiRuntimeServicesData
);
}
}
BOOLEAN
EFIAPI
PlatformIgvmMemoryMapCheck (
VOID
)
{
return PlatformIgvmMemoryMapFind () != NULL;
}
EFI_STATUS
EFIAPI
PlatformIgvmScanE820 (
IN E820_SCAN_CALLBACK Callback,
IN OUT EFI_HOB_PLATFORM_INFO *PlatformInfoHob
)
{
STATIC BOOLEAN First = TRUE;
IGVM_MEMORY_MAP_ENTRY *Map;
EFI_E820_ENTRY64 Entry;
UINT32 Index;
Map = PlatformIgvmMemoryMapFind ();
if (Map == NULL) {
return EFI_NOT_FOUND;
}
for (Index = 0; Map[Index].PageCount > 0; Index++) {
if (First) {
DEBUG ((
DEBUG_INFO,
"%a: IgvmMemoryMap[%d]: PageStart %lx, PageCount %lx, EntryType %d\n",
__func__,
Index,
Map[Index].PageStart,
Map[Index].PageCount,
Map[Index].EntryType
));
}
Entry.BaseAddr = LShiftU64 (Map[Index].PageStart, EFI_PAGE_SHIFT);
Entry.Length = LShiftU64 (Map[Index].PageCount, EFI_PAGE_SHIFT);
switch (Map[Index].EntryType) {
case IGVM_MM_ENTRY_TYPE_MEMORY:
Entry.Type = EfiAcpiAddressRangeMemory;
Callback (&Entry, PlatformInfoHob);
break;
case IGVM_MM_ENTRY_TYPE_RESERVED:
Entry.Type = EfiAcpiAddressRangeReserved;
Callback (&Entry, PlatformInfoHob);
break;
}
}
First = FALSE;
return EFI_SUCCESS;
}
VOID
EFIAPI
PlatformIgvmDataHobs (
VOID
)
{
UINT64 Start, End;
EFI_PEI_HOB_POINTERS Hob;
EFI_IGVM_DATA_HOB *IgvmData;
Start = FixedPcdGet64 (PcdOvmfIgvmHobBase);
End = Start + FixedPcdGet64 (PcdOvmfIgvmHobSize);
if (Start == 0) {
// no parameter area
return;
}
for (Hob.Raw = (VOID *)(UINTN)Start;
;
Hob.Raw = GET_NEXT_HOB (Hob))
{
DEBUG ((
DEBUG_VERBOSE,
"%a: hob: ptr=%p type=0x%x length=%u\n",
__func__,
Hob.Raw,
Hob.Header->HobType,
Hob.Header->HobLength
));
if (Hob.Header->HobType != EFI_HOB_TYPE_GUID_EXTENSION) {
break;
}
if ((UINTN)Hob.Raw + Hob.Header->HobLength > End) {
break;
}
if (CompareMem (&Hob.Guid->Name, &gEfiIgvmDataHobGuid, sizeof (EFI_GUID)) != 0) {
break;
}
IgvmData = (VOID *)(&Hob.Guid->Name + 1);
DEBUG ((
DEBUG_INFO,
"%a: data: address=0x%x length=0x%x type=0x%x flags=0x%x\n",
__func__,
IgvmData->Address,
IgvmData->Length,
IgvmData->DataType,
IgvmData->DataFlags
));
// copy over hob so dxe can easily use it
BuildGuidDataHob (&gEfiIgvmDataHobGuid, IgvmData, sizeof (*IgvmData));
// reserve data block memory
BuildMemoryAllocationHob (
IgvmData->Address,
ALIGN_VALUE (IgvmData->Length, EFI_PAGE_SIZE),
EfiBootServicesData
);
}
}
UINT32
EFIAPI
PlatformIgvmVpCount (
VOID
)
{
UINT64 Address;
UINT32 *VpCount;
if (mIgvmParamsInvalid) {
return 0;
}
Address = FixedPcdGet64 (PcdOvmfIgvmParamBase);
if (Address == 0) {
// no parameter area
return 0;
}
VpCount = (VOID *)(UINTN)(Address + VP_COUNT_OFFSET);
if (!(*VpCount)) {
// no vp count
return 0;
}
if (*VpCount & 0xffff0000) {
DEBUG ((DEBUG_INFO, "%a: vp-count sanity check failed, ignoring\n", __func__));
mIgvmParamsInvalid = TRUE;
return 0;
}
DEBUG ((DEBUG_INFO, "%a: vp-count=%d\n", __func__, *VpCount));
return *VpCount;
}
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