virtcontainers: Add a Virtualization.framework skeleton

Fixes: #6004

A Virtualization.framework based Hypervisor implementation.
This is just stubs for now to eventually get this building.

Signed-off-by: Samuel Ortiz <s.ortiz@apple.com>
Signed-off-by: Danny Canter <danny@dcantah.dev>

src/runtime/virtcontainers/virtframework.go

@@ -0,0 +1,137 @@
+//
+// Copyright (c) 2023 Apple Inc.
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+
+//go:build darwin
+// +build darwin
+
+package virtcontainers
+
+import (
+	"context"
+
+	hv "github.com/kata-containers/kata-containers/src/runtime/pkg/hypervisors"
+	"github.com/kata-containers/kata-containers/src/runtime/virtcontainers/types"
+	"github.com/pkg/errors"
+)
+
+// virtFramework is a Hypervisor interface implementation for Darwin Virtualization.framework.
+type virtFramework struct{}
+
+func (vfw *virtFramework) CreateVM(ctx context.Context, id string, network Network, hypervisorConfig *HypervisorConfig) error {
+	return nil
+}
+
+func (vfw *virtFramework) StartVM(ctx context.Context, timeout int) error {
+	return nil
+}
+
+// If wait is set, don't actively stop the sandbox:
+// just perform cleanup.
+func (vfw *virtFramework) StopVM(ctx context.Context, waitOnly bool) error {
+	return nil
+}
+
+func (vfw *virtFramework) PauseVM(ctx context.Context) error {
+	return nil
+}
+
+func (vfw *virtFramework) SaveVM() error {
+	return nil
+}
+
+func (vfw *virtFramework) ResumeVM(ctx context.Context) error {
+	return nil
+}
+
+func (vfw *virtFramework) AddDevice(ctx context.Context, devInfo interface{}, devType DeviceType) error {
+	return nil
+}
+
+func (vfw *virtFramework) HotplugAddDevice(ctx context.Context, devInfo interface{}, devType DeviceType) (interface{}, error) {
+	return nil, nil
+}
+
+func (vfw *virtFramework) HotplugRemoveDevice(ctx context.Context, devInfo interface{}, devType DeviceType) (interface{}, error) {
+	return nil, nil
+}
+
+func (vfw *virtFramework) ResizeMemory(ctx context.Context, memMB uint32, memoryBlockSizeMB uint32, probe bool) (uint32, MemoryDevice, error) {
+	return 0, MemoryDevice{}, nil
+}
+
+func (vfw *virtFramework) ResizeVCPUs(ctx context.Context, vcpus uint32) (uint32, uint32, error) {
+	return 0, 0, nil
+}
+
+func (vfw *virtFramework) GetVMConsole(ctx context.Context, sandboxID string) (string, string, error) {
+	return "", "", nil
+}
+
+func (vfw *virtFramework) Disconnect(ctx context.Context) {
+}
+
+func (vfw *virtFramework) Capabilities(ctx context.Context) types.Capabilities {
+	return types.Capabilities{}
+}
+
+func (vfw *virtFramework) HypervisorConfig() HypervisorConfig {
+	return HypervisorConfig{}
+}
+
+func (vfw *virtFramework) GetThreadIDs(ctx context.Context) (VcpuThreadIDs, error) {
+	var vcpuInfo VcpuThreadIDs
+
+	vcpuInfo.vcpus = make(map[int]int)
+
+	return vcpuInfo, nil
+}
+
+func (vfw *virtFramework) Cleanup(ctx context.Context) error {
+	return nil
+}
+
+func (vfw *virtFramework) GetTotalMemoryMB(ctx context.Context) uint32 {
+	return 0
+}
+
+func (vfw *virtFramework) setConfig(config *HypervisorConfig) error {
+	return nil
+}
+
+func (vfw *virtFramework) GetPids() []int {
+	return nil
+}
+
+func (vfw *virtFramework) GetVirtioFsPid() *int {
+	return nil
+}
+
+func (vfw *virtFramework) fromGrpc(ctx context.Context, hypervisorConfig *HypervisorConfig, j []byte) error {
+	return errors.New("Darwin is not supported by VM cache")
+}
+
+func (vfw *virtFramework) toGrpc(ctx context.Context) ([]byte, error) {
+	return nil, errors.New("Darwin is not supported by VM cache")
+}
+
+func (vfw *virtFramework) Check() error {
+	return nil
+}
+
+func (vfw *virtFramework) Save() hv.HypervisorState {
+	return hv.HypervisorState{}
+}
+
+func (vfw *virtFramework) Load(hv.HypervisorState) {
+}
+
+func (vfw *virtFramework) GenerateSocket(id string) (interface{}, error) {
+	return nil, nil
+}
+
+func (vfw *virtFramework) IsRateLimiterBuiltin() bool {
+	return false
+}