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OvmfPkg/QemuKernelLoaderFsDxe: add support for igvm data blobs

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In case shim or kernel blobs have been loaded via IGVM, register them as
files in the kernel loader pseudo file system.  They will be used for
direct kernel boot then.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Gerd Hoffmann 2025-09-10 15:04:51 +02:00 • committed by mergify[bot]
parent c36111cfca
commit 251462324f
2 changed files with 83 additions and 0 deletions
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81
OvmfPkg/QemuKernelLoaderFsDxe/QemuKernelLoaderFsDxe.c
View file

@ -15,11 +15,13 @@
#include <Guid/FileSystemVolumeLabelInfo.h>
#include <Guid/LinuxEfiInitrdMedia.h>
#include <Guid/QemuKernelLoaderFsMedia.h>
#include <IndustryStandard/IgvmData.h>
#include <Library/BaseLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/BlobVerifierLib.h>
#include <Library/DebugLib.h>
#include <Library/DevicePathLib.h>
#include <Library/HobLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Library/PrintLib.h>
#include <Library/QemuFwCfgLib.h>
@ -1148,6 +1150,69 @@ QemuKernelFetchNamedBlobs (
return EFI_SUCCESS;
}
STATIC
EFI_STATUS
QemuKernelRegisterIgvmBlobs (
VOID
)
{
EFI_HOB_GUID_TYPE *Hob;
EFI_IGVM_DATA_HOB *IgvmData;
CHAR16 *Name;
KERNEL_BLOB *Blob;
EFI_STATUS Status;
Hob = GetFirstGuidHob (&gEfiIgvmDataHobGuid);
while (Hob) {
IgvmData = (VOID *)(Hob + 1);
switch (IgvmData->DataType) {
case EFI_IGVM_DATA_TYPE_SHIM:
Name = L"shim";
break;
case EFI_IGVM_DATA_TYPE_KERNEL:
Name = L"kernel";
break;
default:
Name = NULL;
break;
}
if (Name != NULL) {
DEBUG ((
DEBUG_INFO,
"%a: address=0x%lx length=0x%lx type=0x%x -> Name=%s\n",
__func__,
IgvmData->Address,
IgvmData->Length,
IgvmData->DataType,
Name
));
Blob = AllocatePool (sizeof (*Blob));
if (Blob == NULL) {
return EFI_OUT_OF_RESOURCES;
}
ZeroMem (Blob, sizeof (*Blob));
Status = StrCpyS (Blob->Name, sizeof (Blob->Name), Name);
ASSERT (!EFI_ERROR (Status));
Blob->Data = (VOID *)(UINTN)IgvmData->Address;
Blob->Size = (UINT32)IgvmData->Length;
Blob->Next = mKernelBlobs;
mKernelBlobs = Blob;
mKernelBlobCount++;
mTotalBlobBytes += Blob->Size;
}
Hob = GetNextGuidHob (&gEfiIgvmDataHobGuid, GET_NEXT_HOB (Hob));
}
return EFI_SUCCESS;
}
//
// The entry point of the feature.
//
@ -1190,6 +1255,21 @@ QemuKernelLoaderFsDxeEntrypoint (
return Status;
}
//
// Register IGVM blobs
//
DEBUG ((DEBUG_INFO, "%a: igvm blobs\n", __func__));
Status = QemuKernelRegisterIgvmBlobs ();
if (EFI_ERROR (Status)) {
goto FreeBlobs;
}
if (mKernelBlobCount) {
// If we got efi binaries via igvm data blobs:
// Use only those and ignore fw_cfg data.
goto skipFwCfg;
}
//
// Fetch named blobs.
//
@ -1227,6 +1307,7 @@ QemuKernelLoaderFsDxeEntrypoint (
goto FreeBlobs;
}
skipFwCfg:
//
// Create a new handle with a single VenMedia() node device path protocol on
// it, plus a custom SimpleFileSystem protocol on it.

2
OvmfPkg/QemuKernelLoaderFsDxe/QemuKernelLoaderFsDxe.inf
View file

@ -29,6 +29,7 @@
BaseMemoryLib
DebugLib
DevicePathLib
HobLib
MemoryAllocationLib
PrintLib
QemuFwCfgLib
@ -41,6 +42,7 @@
gEfiFileSystemInfoGuid
gEfiFileSystemVolumeLabelInfoIdGuid
gQemuKernelLoaderFsMediaGuid
gEfiIgvmDataHobGuid
[Protocols]
gEfiDevicePathProtocolGuid ## PRODUCES