runtime: Enable ImageName annotation for remote hypervisor

Enables ImageName to support multiple VM images in remote hypervisor scenario

Fixes https://github.com/kata-containers/kata-containers/issues/10240

Signed-off-by: Ajay Victor <ajvictor@in.ibm.com>

src/runtime/config/configuration-remote.toml.in

@@ -38,7 +38,7 @@ remote_hypervisor_timeout = 600
 # Each member of the list is a regular expression, which is the base name
 # of the annotation, e.g. "path" for io.katacontainers.config.hypervisor.path"
 # Note: Remote hypervisor is only handling the following annotations
-enable_annotations = ["machine_type", "default_memory", "default_vcpus"]
+enable_annotations = ["machine_type", "default_memory", "default_vcpus", "image"]
 
 # Optional space-separated list of options to pass to the guest kernel.
 # For example, use `kernel_params = "vsyscall=emulate"` if you are having

src/runtime/virtcontainers/remote.go

@@ -77,6 +77,7 @@ func (rh *remoteHypervisor) CreateVM(ctx context.Context, id string, network Net
 	annotations[cri.SandboxName] = hypervisorConfig.SandboxName
 	annotations[cri.SandboxNamespace] = hypervisorConfig.SandboxNamespace
 	annotations[hypannotations.MachineType] = hypervisorConfig.HypervisorMachineType
+	annotations[hypannotations.ImagePath] = hypervisorConfig.ImagePath
 	annotations[hypannotations.DefaultVCPUs] = strconv.FormatUint(uint64(hypervisorConfig.NumVCPUs()), 10)
 	annotations[hypannotations.DefaultMemory] = strconv.FormatUint(uint64(hypervisorConfig.MemorySize), 10)
 	annotations[hypannotations.Initdata] = hypervisorConfig.Initdata

src/runtime/virtcontainers/sandbox.go

@@ -448,6 +448,17 @@ func createAssets(ctx context.Context, sandboxConfig *SandboxConfig) error {
 	defer span.End()
 
 	for _, name := range types.AssetTypes() {
+		annotation, _, err := name.Annotations()
+		if err != nil {
+			return err
+		}
+		// For remote hypervisor donot check for Absolute Path incase of ImagePath, as it denotes the name of the image.
+		if sandboxConfig.HypervisorType == RemoteHypervisor && annotation == annotations.ImagePath {
+			value := sandboxConfig.Annotations[annotation]
+			if value != "" {
+				sandboxConfig.HypervisorConfig.ImagePath = value
+			}
+		} else {
 			a, err := types.NewAsset(sandboxConfig.Annotations, name)
 			if err != nil {
 				return err
@@ -457,6 +468,7 @@ func createAssets(ctx context.Context, sandboxConfig *SandboxConfig) error {
 				return err
 			}
 		}
+	}
 
 	_, imageErr := sandboxConfig.HypervisorConfig.assetPath(types.ImageAsset)
 	_, initrdErr := sandboxConfig.HypervisorConfig.assetPath(types.InitrdAsset)

src/runtime/virtcontainers/sandbox_test.go

@@ -771,6 +771,24 @@ func TestSandboxCreateAssets(t *testing.T) {
 		err = createAssets(context.Background(), config)
 		assert.Error(err, msg)
 	}
+
+	// Remote Hypervisor scenario for ImagePath
+	msg := "test[image]: imagePath"
+	imagePathData := &testData{
+		assetType: types.ImageAsset,
+		annotations: map[string]string{
+			annotations.ImagePath: "rhel9-os",
+		},
+	}
+
+	config := &SandboxConfig{
+		Annotations:      imagePathData.annotations,
+		HypervisorConfig: hc,
+		HypervisorType:   RemoteHypervisor,
+	}
+
+	err = createAssets(context.Background(), config)
+	assert.NoError(err, msg)
 }
 
 func testFindContainerFailure(t *testing.T, sandbox *Sandbox, cid string) {