1 files changed, 56 insertions, 1 deletions
diff --git a/OvmfPkg/VirtioFsDxe/SimpleFsOpenVolume.c b/OvmfPkg/VirtioFsDxe/SimpleFsOpenVolume.c
index a5a66a27d8..8c1457a68a 100644
--- a/OvmfPkg/VirtioFsDxe/SimpleFsOpenVolume.c
+++ b/OvmfPkg/VirtioFsDxe/SimpleFsOpenVolume.c
@@ -7,6 +7,9 @@
   SPDX-License-Identifier: BSD-2-Clause-Patent
 **/
 
+#include <Library/BaseLib.h>             // InsertTailList()
+#include <Library/MemoryAllocationLib.h> // AllocatePool()
+
 #include "VirtioFsDxe.h"
 
 /**
@@ -22,5 +25,57 @@ VirtioFsOpenVolume (
   OUT EFI_FILE_PROTOCOL               **Root
   )
 {
-  return EFI_NO_MEDIA;
+  VIRTIO_FS      *VirtioFs;
+  VIRTIO_FS_FILE *VirtioFsFile;
+  EFI_STATUS     Status;
+  UINT64         RootDirHandle;
+
+  VirtioFs = VIRTIO_FS_FROM_SIMPLE_FS (This);
+
+  VirtioFsFile = AllocatePool (sizeof *VirtioFsFile);
+  if (VirtioFsFile == NULL) {
+    return EFI_OUT_OF_RESOURCES;
+  }
+
+  //
+  // Open the root directory.
+  //
+  Status = VirtioFsFuseOpenDir (VirtioFs, VIRTIO_FS_FUSE_ROOT_DIR_NODE_ID,
+             &RootDirHandle);
+  if (EFI_ERROR (Status)) {
+    goto FreeVirtioFsFile;
+  }
+
+  //
+  // Populate the new VIRTIO_FS_FILE object.
+  //
+  VirtioFsFile->Signature              = VIRTIO_FS_FILE_SIG;
+  VirtioFsFile->SimpleFile.Revision    = EFI_FILE_PROTOCOL_REVISION;
+  VirtioFsFile->SimpleFile.Open        = VirtioFsSimpleFileOpen;
+  VirtioFsFile->SimpleFile.Close       = VirtioFsSimpleFileClose;
+  VirtioFsFile->SimpleFile.Delete      = VirtioFsSimpleFileDelete;
+  VirtioFsFile->SimpleFile.Read        = VirtioFsSimpleFileRead;
+  VirtioFsFile->SimpleFile.Write       = VirtioFsSimpleFileWrite;
+  VirtioFsFile->SimpleFile.GetPosition = VirtioFsSimpleFileGetPosition;
+  VirtioFsFile->SimpleFile.SetPosition = VirtioFsSimpleFileSetPosition;
+  VirtioFsFile->SimpleFile.GetInfo     = VirtioFsSimpleFileGetInfo;
+  VirtioFsFile->SimpleFile.SetInfo     = VirtioFsSimpleFileSetInfo;
+  VirtioFsFile->SimpleFile.Flush       = VirtioFsSimpleFileFlush;
+  VirtioFsFile->IsDirectory            = TRUE;
+  VirtioFsFile->OwnerFs                = VirtioFs;
+  VirtioFsFile->NodeId                 = VIRTIO_FS_FUSE_ROOT_DIR_NODE_ID;
+  VirtioFsFile->FuseHandle             = RootDirHandle;
+
+  //
+  // One more file open for the filesystem.
+  //
+  InsertTailList (&VirtioFs->OpenFiles, &VirtioFsFile->OpenFilesEntry);
+
+  *Root = &VirtioFsFile->SimpleFile;
+  return EFI_SUCCESS;
+
+FreeVirtioFsFile:
+  FreePool (VirtioFsFile);
+
+  return Status;
 }