5ab6a0e1c8
The purpose of the driver is to ease file exchange (file sharing) between the guest firmware and the virtualization host. The driver is supposed to interoperate with QEMU's "virtiofsd" (Virtio Filesystem Daemon). References: - https://virtio-fs.gitlab.io/ - https://libvirt.org/kbase/virtiofs.html VirtioFsDxe will bind virtio-fs devices, and produce EFI_SIMPLE_FILE_SYSTEM_PROTOCOL instances on them. In the longer term, assuming QEMU will create "bootorder" fw_cfg file entries for virtio-fs devices, booting guest OSes from host-side directories should become possible (dependent on the matching QemuBootOrderLib enhancement). Add the skeleton of the driver. Install EFI_DRIVER_BINDING_PROTOCOL with stub member functions. Install EFI_COMPONENT_NAME2_PROTOCOL with final member functions. This suffices for the DRIVERS command in the UEFI Shell to list the driver with a human-readable name. The file permission model is described immediately in the INF file as a comment block, for future reference. Cc: Ard Biesheuvel <ard.biesheuvel@arm.com> Cc: Jordan Justen <jordan.l.justen@intel.com> Cc: Philippe Mathieu-Daudé <philmd@redhat.com> Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=3097 Signed-off-by: Laszlo Ersek <lersek@redhat.com> Message-Id: <20201216211125.19496-2-lersek@redhat.com> Acked-by: Ard Biesheuvel <ard.biesheuvel@arm.com>
113 lines
3.0 KiB
C
113 lines
3.0 KiB
C
/** @file
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Provide EFI_SIMPLE_FILE_SYSTEM_PROTOCOL instances on virtio-fs devices.
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Copyright (C) 2020, Red Hat, Inc.
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include <Library/BaseLib.h> // AsciiStrCmp()
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#include <Library/UefiBootServicesTableLib.h> // gBS
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#include <Protocol/ComponentName2.h> // EFI_COMPONENT_NAME2_PROTOCOL
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#include <Protocol/DriverBinding.h> // EFI_DRIVER_BINDING_PROTOCOL
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//
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// UEFI Driver Model protocol instances.
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//
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STATIC EFI_DRIVER_BINDING_PROTOCOL mDriverBinding;
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STATIC EFI_COMPONENT_NAME2_PROTOCOL mComponentName2;
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//
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// UEFI Driver Model protocol member functions.
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//
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EFI_STATUS
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EFIAPI
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VirtioFsBindingSupported (
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IN EFI_DRIVER_BINDING_PROTOCOL *This,
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IN EFI_HANDLE ControllerHandle,
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IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath OPTIONAL
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)
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{
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return EFI_UNSUPPORTED;
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}
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EFI_STATUS
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EFIAPI
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VirtioFsBindingStart (
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IN EFI_DRIVER_BINDING_PROTOCOL *This,
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IN EFI_HANDLE ControllerHandle,
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IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath OPTIONAL
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)
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{
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return EFI_DEVICE_ERROR;
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}
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EFI_STATUS
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EFIAPI
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VirtioFsBindingStop (
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IN EFI_DRIVER_BINDING_PROTOCOL *This,
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IN EFI_HANDLE ControllerHandle,
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IN UINTN NumberOfChildren,
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IN EFI_HANDLE *ChildHandleBuffer OPTIONAL
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)
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{
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return EFI_DEVICE_ERROR;
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}
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EFI_STATUS
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EFIAPI
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VirtioFsGetDriverName (
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IN EFI_COMPONENT_NAME2_PROTOCOL *This,
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IN CHAR8 *Language,
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OUT CHAR16 **DriverName
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)
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{
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if (AsciiStrCmp (Language, "en") != 0) {
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return EFI_UNSUPPORTED;
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}
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*DriverName = L"Virtio Filesystem Driver";
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return EFI_SUCCESS;
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}
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EFI_STATUS
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EFIAPI
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VirtioFsGetControllerName (
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IN EFI_COMPONENT_NAME2_PROTOCOL *This,
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IN EFI_HANDLE ControllerHandle,
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IN EFI_HANDLE ChildHandle OPTIONAL,
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IN CHAR8 *Language,
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OUT CHAR16 **ControllerName
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)
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{
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return EFI_UNSUPPORTED;
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}
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//
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// Entry point of this driver.
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//
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EFI_STATUS
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EFIAPI
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VirtioFsEntryPoint (
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IN EFI_HANDLE ImageHandle,
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IN EFI_SYSTEM_TABLE *SystemTable
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)
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{
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EFI_STATUS Status;
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mDriverBinding.Supported = VirtioFsBindingSupported;
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mDriverBinding.Start = VirtioFsBindingStart;
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mDriverBinding.Stop = VirtioFsBindingStop;
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mDriverBinding.Version = 0x10;
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mDriverBinding.ImageHandle = ImageHandle;
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mDriverBinding.DriverBindingHandle = ImageHandle;
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mComponentName2.GetDriverName = VirtioFsGetDriverName;
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mComponentName2.GetControllerName = VirtioFsGetControllerName;
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mComponentName2.SupportedLanguages = "en";
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Status = gBS->InstallMultipleProtocolInterfaces (&ImageHandle,
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&gEfiDriverBindingProtocolGuid, &mDriverBinding,
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&gEfiComponentName2ProtocolGuid, &mComponentName2, NULL);
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return Status;
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}
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