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-rw-r--r--OvmfPkg/Include/IndustryStandard/Virtio10.h5
-rw-r--r--OvmfPkg/VirtioFsDxe/DriverBinding.c94
-rw-r--r--OvmfPkg/VirtioFsDxe/SimpleFsOpenVolume.c26
-rw-r--r--OvmfPkg/VirtioFsDxe/VirtioFsDxe.h52
-rw-r--r--OvmfPkg/VirtioFsDxe/VirtioFsDxe.inf7
5 files changed, 181 insertions, 3 deletions
diff --git a/OvmfPkg/Include/IndustryStandard/Virtio10.h b/OvmfPkg/Include/IndustryStandard/Virtio10.h
index 3c1592d1fd..2c60be2b7c 100644
--- a/OvmfPkg/Include/IndustryStandard/Virtio10.h
+++ b/OvmfPkg/Include/IndustryStandard/Virtio10.h
@@ -17,6 +17,11 @@
// Subsystem Device IDs (to be) introduced in VirtIo 1.0
//
#define VIRTIO_SUBSYSTEM_GPU_DEVICE 16
+//
+// Subsystem Device IDs from the VirtIo spec at git commit 87fa6b5d8155;
+// <https://github.com/oasis-tcs/virtio-spec/tree/87fa6b5d8155>.
+//
+#define VIRTIO_SUBSYSTEM_FILESYSTEM 26
//
// Structures for parsing the VirtIo 1.0 specific PCI capabilities from the
diff --git a/OvmfPkg/VirtioFsDxe/DriverBinding.c b/OvmfPkg/VirtioFsDxe/DriverBinding.c
index ac0a6330f0..65e45b5c4b 100644
--- a/OvmfPkg/VirtioFsDxe/DriverBinding.c
+++ b/OvmfPkg/VirtioFsDxe/DriverBinding.c
@@ -6,11 +6,15 @@
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
+#include <IndustryStandard/Virtio.h> // VIRTIO_SUBSYSTEM_FILESYSTEM
#include <Library/BaseLib.h> // AsciiStrCmp()
+#include <Library/MemoryAllocationLib.h> // AllocatePool()
#include <Library/UefiBootServicesTableLib.h> // gBS
#include <Protocol/ComponentName2.h> // EFI_COMPONENT_NAME2_PROTOCOL
#include <Protocol/DriverBinding.h> // EFI_DRIVER_BINDING_PROTOCOL
+#include "VirtioFsDxe.h"
+
//
// UEFI Driver Model protocol instances.
//
@@ -28,7 +32,27 @@ VirtioFsBindingSupported (
IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath OPTIONAL
)
{
- return EFI_UNSUPPORTED;
+ EFI_STATUS Status;
+ VIRTIO_DEVICE_PROTOCOL *Virtio;
+ EFI_STATUS CloseStatus;
+
+ Status = gBS->OpenProtocol (ControllerHandle, &gVirtioDeviceProtocolGuid,
+ (VOID **)&Virtio, This->DriverBindingHandle,
+ ControllerHandle, EFI_OPEN_PROTOCOL_BY_DRIVER);
+ if (EFI_ERROR (Status)) {
+ return Status;
+ }
+
+ if (Virtio->SubSystemDeviceId != VIRTIO_SUBSYSTEM_FILESYSTEM) {
+ Status = EFI_UNSUPPORTED;
+ }
+
+ CloseStatus = gBS->CloseProtocol (ControllerHandle,
+ &gVirtioDeviceProtocolGuid, This->DriverBindingHandle,
+ ControllerHandle);
+ ASSERT_EFI_ERROR (CloseStatus);
+
+ return Status;
}
EFI_STATUS
@@ -39,7 +63,45 @@ VirtioFsBindingStart (
IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath OPTIONAL
)
{
- return EFI_DEVICE_ERROR;
+ VIRTIO_FS *VirtioFs;
+ EFI_STATUS Status;
+ EFI_STATUS CloseStatus;
+
+ VirtioFs = AllocatePool (sizeof *VirtioFs);
+ if (VirtioFs == NULL) {
+ return EFI_OUT_OF_RESOURCES;
+ }
+ VirtioFs->Signature = VIRTIO_FS_SIG;
+
+ Status = gBS->OpenProtocol (ControllerHandle, &gVirtioDeviceProtocolGuid,
+ (VOID **)&VirtioFs->Virtio, This->DriverBindingHandle,
+ ControllerHandle, EFI_OPEN_PROTOCOL_BY_DRIVER);
+ if (EFI_ERROR (Status)) {
+ goto FreeVirtioFs;
+ }
+
+ VirtioFs->SimpleFs.Revision = EFI_SIMPLE_FILE_SYSTEM_PROTOCOL_REVISION;
+ VirtioFs->SimpleFs.OpenVolume = VirtioFsOpenVolume;
+
+ Status = gBS->InstallProtocolInterface (&ControllerHandle,
+ &gEfiSimpleFileSystemProtocolGuid, EFI_NATIVE_INTERFACE,
+ &VirtioFs->SimpleFs);
+ if (EFI_ERROR (Status)) {
+ goto CloseVirtio;
+ }
+
+ return EFI_SUCCESS;
+
+CloseVirtio:
+ CloseStatus = gBS->CloseProtocol (ControllerHandle,
+ &gVirtioDeviceProtocolGuid, This->DriverBindingHandle,
+ ControllerHandle);
+ ASSERT_EFI_ERROR (CloseStatus);
+
+FreeVirtioFs:
+ FreePool (VirtioFs);
+
+ return Status;
}
EFI_STATUS
@@ -51,7 +113,33 @@ VirtioFsBindingStop (
IN EFI_HANDLE *ChildHandleBuffer OPTIONAL
)
{
- return EFI_DEVICE_ERROR;
+ EFI_STATUS Status;
+ EFI_SIMPLE_FILE_SYSTEM_PROTOCOL *SimpleFs;
+ VIRTIO_FS *VirtioFs;
+
+ Status = gBS->OpenProtocol (ControllerHandle,
+ &gEfiSimpleFileSystemProtocolGuid, (VOID **)&SimpleFs,
+ This->DriverBindingHandle, ControllerHandle,
+ EFI_OPEN_PROTOCOL_GET_PROTOCOL);
+ if (EFI_ERROR (Status)) {
+ return Status;
+ }
+
+ VirtioFs = VIRTIO_FS_FROM_SIMPLE_FS (SimpleFs);
+
+ Status = gBS->UninstallProtocolInterface (ControllerHandle,
+ &gEfiSimpleFileSystemProtocolGuid, SimpleFs);
+ if (EFI_ERROR (Status)) {
+ return Status;
+ }
+
+ Status = gBS->CloseProtocol (ControllerHandle, &gVirtioDeviceProtocolGuid,
+ This->DriverBindingHandle, ControllerHandle);
+ ASSERT_EFI_ERROR (Status);
+
+ FreePool (VirtioFs);
+
+ return EFI_SUCCESS;
}
EFI_STATUS
diff --git a/OvmfPkg/VirtioFsDxe/SimpleFsOpenVolume.c b/OvmfPkg/VirtioFsDxe/SimpleFsOpenVolume.c
new file mode 100644
index 0000000000..a5a66a27d8
--- /dev/null
+++ b/OvmfPkg/VirtioFsDxe/SimpleFsOpenVolume.c
@@ -0,0 +1,26 @@
+/** @file
+ EFI_SIMPLE_FILE_SYSTEM_PROTOCOL.OpenVolume() member function for the Virtio
+ Filesystem driver.
+
+ Copyright (C) 2020, Red Hat, Inc.
+
+ SPDX-License-Identifier: BSD-2-Clause-Patent
+**/
+
+#include "VirtioFsDxe.h"
+
+/**
+ Open the root directory on the Virtio Filesystem.
+
+ Refer to EFI_SIMPLE_FILE_SYSTEM_PROTOCOL_OPEN_VOLUME for the interface
+ contract.
+**/
+EFI_STATUS
+EFIAPI
+VirtioFsOpenVolume (
+ IN EFI_SIMPLE_FILE_SYSTEM_PROTOCOL *This,
+ OUT EFI_FILE_PROTOCOL **Root
+ )
+{
+ return EFI_NO_MEDIA;
+}
diff --git a/OvmfPkg/VirtioFsDxe/VirtioFsDxe.h b/OvmfPkg/VirtioFsDxe/VirtioFsDxe.h
new file mode 100644
index 0000000000..287defd21f
--- /dev/null
+++ b/OvmfPkg/VirtioFsDxe/VirtioFsDxe.h
@@ -0,0 +1,52 @@
+/** @file
+ Internal macro definitions, type definitions, and function declarations for
+ the Virtio Filesystem device driver.
+
+ Copyright (C) 2020, Red Hat, Inc.
+
+ SPDX-License-Identifier: BSD-2-Clause-Patent
+**/
+
+#ifndef VIRTIO_FS_DXE_H_
+#define VIRTIO_FS_DXE_H_
+
+#include <Base.h> // SIGNATURE_64()
+#include <Library/DebugLib.h> // CR()
+#include <Protocol/SimpleFileSystem.h> // EFI_SIMPLE_FILE_SYSTEM_PROTOCOL
+#include <Protocol/VirtioDevice.h> // VIRTIO_DEVICE_PROTOCOL
+
+#define VIRTIO_FS_SIG SIGNATURE_64 ('V', 'I', 'R', 'T', 'I', 'O', 'F', 'S')
+
+//
+// Main context structure, expressing an EFI_SIMPLE_FILE_SYSTEM_PROTOCOL
+// interface on top of the Virtio Filesystem device.
+//
+typedef struct {
+ //
+ // Parts of this structure are initialized / torn down in various functions
+ // at various call depths. The table to the right should make it easier to
+ // track them.
+ //
+ // field init function init depth
+ // ----------- ------------------ ----------
+ UINT64 Signature; // DriverBindingStart 0
+ VIRTIO_DEVICE_PROTOCOL *Virtio; // DriverBindingStart 0
+ EFI_SIMPLE_FILE_SYSTEM_PROTOCOL SimpleFs; // DriverBindingStart 0
+} VIRTIO_FS;
+
+#define VIRTIO_FS_FROM_SIMPLE_FS(SimpleFsReference) \
+ CR (SimpleFsReference, VIRTIO_FS, SimpleFs, VIRTIO_FS_SIG);
+
+//
+// EFI_SIMPLE_FILE_SYSTEM_PROTOCOL member functions for the Virtio Filesystem
+// driver.
+//
+
+EFI_STATUS
+EFIAPI
+VirtioFsOpenVolume (
+ IN EFI_SIMPLE_FILE_SYSTEM_PROTOCOL *This,
+ OUT EFI_FILE_PROTOCOL **Root
+ );
+
+#endif // VIRTIO_FS_DXE_H_
diff --git a/OvmfPkg/VirtioFsDxe/VirtioFsDxe.inf b/OvmfPkg/VirtioFsDxe/VirtioFsDxe.inf
index 69cb44bc7c..ff9b1c6178 100644
--- a/OvmfPkg/VirtioFsDxe/VirtioFsDxe.inf
+++ b/OvmfPkg/VirtioFsDxe/VirtioFsDxe.inf
@@ -78,15 +78,22 @@
[Packages]
MdePkg/MdePkg.dec
+ OvmfPkg/OvmfPkg.dec
[Sources]
DriverBinding.c
+ SimpleFsOpenVolume.c
+ VirtioFsDxe.h
[LibraryClasses]
BaseLib
+ DebugLib
+ MemoryAllocationLib
UefiBootServicesTableLib
UefiDriverEntryPoint
[Protocols]
gEfiComponentName2ProtocolGuid ## PRODUCES
gEfiDriverBindingProtocolGuid ## PRODUCES
+ gEfiSimpleFileSystemProtocolGuid ## BY_START
+ gVirtioDeviceProtocolGuid ## TO_START
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-04 17:42:51 +0000