Default to jit-cdi mode in the nvidia runtime

Signed-off-by: Evan Lezar <elezar@nvidia.com>

cmd/nvidia-container-runtime/main_test.go

@@ -125,8 +125,8 @@ func TestGoodInput(t *testing.T) {
 	// Check config.json for NVIDIA prestart hook
 	spec, err = cfg.getRuntimeSpec()
 	require.NoError(t, err, "should be no errors when reading and parsing spec from config.json")
-	require.NotEmpty(t, spec.Hooks, "there should be hooks in config.json")
-	require.Equal(t, 1, nvidiaHookCount(spec.Hooks), "exactly one nvidia prestart hook should be inserted correctly into config.json")
+	require.Empty(t, spec.Hooks, "there should be hooks in config.json")
+	require.Equal(t, 0, nvidiaHookCount(spec.Hooks), "exactly one nvidia prestart hook should be inserted correctly into config.json")
 }
 
 // NVIDIA prestart hook already present in config file
@@ -171,8 +171,8 @@ func TestDuplicateHook(t *testing.T) {
 	// Check config.json for NVIDIA prestart hook
 	spec, err = cfg.getRuntimeSpec()
 	require.NoError(t, err, "should be no errors when reading and parsing spec from config.json")
-	require.NotEmpty(t, spec.Hooks, "there should be hooks in config.json")
-	require.Equal(t, 1, nvidiaHookCount(spec.Hooks), "exactly one nvidia prestart hook should be inserted correctly into config.json")
+	require.Empty(t, spec.Hooks, "there should be no hooks in config.json")
+	require.Equal(t, 0, nvidiaHookCount(spec.Hooks), "exactly one nvidia prestart hook should be inserted correctly into config.json")
 }
 
 // addNVIDIAHook is a basic wrapper for an addHookModifier that is used for

internal/info/auto.go

@@ -30,6 +30,7 @@ const (
 	RuntimeModeLegacy = RuntimeMode("legacy")
 	RuntimeModeCSV    = RuntimeMode("csv")
 	RuntimeModeCDI    = RuntimeMode("cdi")
+	RuntimeModeJitCDI = RuntimeMode("jit-cdi")
 )
 
 // ResolveAutoMode determines the correct mode for the platform if set to "auto"
@@ -57,9 +58,9 @@ func resolveMode(logger logger.Interface, mode string, image image.CUDA, propert
 
 	switch nvinfo.ResolvePlatform() {
 	case info.PlatformNVML, info.PlatformWSL:
-		return RuntimeModeLegacy
+		return RuntimeModeJitCDI
 	case info.PlatformTegra:
 		return RuntimeModeCSV
 	}
-	return RuntimeModeLegacy
+	return RuntimeModeJitCDI
 }

internal/info/auto_test.go

@@ -44,10 +44,15 @@ func TestResolveAutoMode(t *testing.T) {
 			expectedMode: "not-auto",
 		},
 		{
-			description:  "no info defaults to legacy",
+			description:  "legacy resolves to legacy",
+			mode:         "legacy",
+			expectedMode: "legacy",
+		},
+		{
+			description:  "no info defaults to jit-cdi",
 			mode:         "auto",
 			info:         map[string]bool{},
-			expectedMode: "legacy",
+			expectedMode: "jit-cdi",
 		},
 		{
 			description: "non-nvml, non-tegra, nvgpu resolves to csv",
@@ -80,14 +85,14 @@ func TestResolveAutoMode(t *testing.T) {
 			expectedMode: "csv",
 		},
 		{
-			description: "nvml, non-tegra, non-nvgpu resolves to legacy",
+			description: "nvml, non-tegra, non-nvgpu resolves to jit-cdi",
 			mode:        "auto",
 			info: map[string]bool{
 				"nvml":  true,
 				"tegra": false,
 				"nvgpu": false,
 			},
-			expectedMode: "legacy",
+			expectedMode: "jit-cdi",
 		},
 		{
 			description: "nvml, non-tegra, nvgpu resolves to csv",
@@ -100,14 +105,14 @@ func TestResolveAutoMode(t *testing.T) {
 			expectedMode: "csv",
 		},
 		{
-			description: "nvml, tegra, non-nvgpu resolves to legacy",
+			description: "nvml, tegra, non-nvgpu resolves to jit-cdi",
 			mode:        "auto",
 			info: map[string]bool{
 				"nvml":  true,
 				"tegra": true,
 				"nvgpu": false,
 			},
-			expectedMode: "legacy",
+			expectedMode: "jit-cdi",
 		},
 		{
 			description: "nvml, tegra, nvgpu resolves to csv",
@@ -136,7 +141,7 @@ func TestResolveAutoMode(t *testing.T) {
 			},
 		},
 		{
-			description: "at least one non-cdi device resolves to legacy",
+			description: "at least one non-cdi device resolves to jit-cdi",
 			mode:        "auto",
 			envmap: map[string]string{
 				"NVIDIA_VISIBLE_DEVICES": "nvidia.com/gpu=0,0",
@@ -146,7 +151,7 @@ func TestResolveAutoMode(t *testing.T) {
 				"tegra": false,
 				"nvgpu": false,
 			},
-			expectedMode: "legacy",
+			expectedMode: "jit-cdi",
 		},
 		{
 			description: "at least one non-cdi device resolves to csv",
@@ -170,7 +175,7 @@ func TestResolveAutoMode(t *testing.T) {
 			expectedMode: "cdi",
 		},
 		{
-			description: "cdi mount and non-CDI devices resolves to legacy",
+			description: "cdi mount and non-CDI devices resolves to jit-cdi",
 			mode:        "auto",
 			mounts: []string{
 				"/var/run/nvidia-container-devices/cdi/nvidia.com/gpu/0",
@@ -181,10 +186,10 @@ func TestResolveAutoMode(t *testing.T) {
 				"tegra": false,
 				"nvgpu": false,
 			},
-			expectedMode: "legacy",
+			expectedMode: "jit-cdi",
 		},
 		{
-			description: "cdi mount and non-CDI envvar resolves to legacy",
+			description: "cdi mount and non-CDI envvar resolves to jit-cdi",
 			mode:        "auto",
 			envmap: map[string]string{
 				"NVIDIA_VISIBLE_DEVICES": "0",
@@ -197,7 +202,7 @@ func TestResolveAutoMode(t *testing.T) {
 				"tegra": false,
 				"nvgpu": false,
 			},
-			expectedMode: "legacy",
+			expectedMode: "jit-cdi",
 		},
 	}
 

internal/modifier/cdi.go

@@ -31,11 +31,22 @@ import (
 	"github.com/NVIDIA/nvidia-container-toolkit/pkg/nvcdi/spec"
 )
 
+const (
+	automaticDeviceVendor = "runtime.nvidia.com"
+	automaticDeviceClass  = "gpu"
+	automaticDeviceKind   = automaticDeviceVendor + "/" + automaticDeviceClass
+)
+
 // NewCDIModifier creates an OCI spec modifier that determines the modifications to make based on the
 // CDI specifications available on the system. The NVIDIA_VISIBLE_DEVICES environment variable is
 // used to select the devices to include.
-func NewCDIModifier(logger logger.Interface, cfg *config.Config, ociSpec oci.Spec) (oci.SpecModifier, error) {
-	devices, err := getDevicesFromSpec(logger, ociSpec, cfg)
+func NewCDIModifier(logger logger.Interface, cfg *config.Config, ociSpec oci.Spec, isJitCDI bool) (oci.SpecModifier, error) {
+	defaultKind := cfg.NVIDIAContainerRuntimeConfig.Modes.CDI.DefaultKind
+	if isJitCDI {
+		defaultKind = automaticDeviceKind
+	}
+
+	devices, err := getDevicesFromSpec(logger, ociSpec, cfg, defaultKind)
 	if err != nil {
 		return nil, fmt.Errorf("failed to get required devices from OCI specification: %v", err)
 	}
@@ -65,7 +76,7 @@ func NewCDIModifier(logger logger.Interface, cfg *config.Config, ociSpec oci.Spe
 	)
 }
 
-func getDevicesFromSpec(logger logger.Interface, ociSpec oci.Spec, cfg *config.Config) ([]string, error) {
+func getDevicesFromSpec(logger logger.Interface, ociSpec oci.Spec, cfg *config.Config, defaultKind string) ([]string, error) {
 	rawSpec, err := ociSpec.Load()
 	if err != nil {
 		return nil, fmt.Errorf("failed to load OCI spec: %v", err)
@@ -83,26 +94,16 @@ func getDevicesFromSpec(logger logger.Interface, ociSpec oci.Spec, cfg *config.C
 	if err != nil {
 		return nil, err
 	}
-	if cfg.AcceptDeviceListAsVolumeMounts {
-		mountDevices := container.CDIDevicesFromMounts()
-		if len(mountDevices) > 0 {
-			return mountDevices, nil
-		}
-	}
 
 	var devices []string
-	seen := make(map[string]bool)
-	for _, name := range container.VisibleDevicesFromEnvVar() {
-		if !parser.IsQualifiedName(name) {
-			name = fmt.Sprintf("%s=%s", cfg.NVIDIAContainerRuntimeConfig.Modes.CDI.DefaultKind, name)
+	if cfg.AcceptDeviceListAsVolumeMounts {
+		devices = normalizeDeviceList(logger, defaultKind, append(container.DevicesFromMounts(), container.CDIDevicesFromMounts()...)...)
+		if len(devices) > 0 {
+			return devices, nil
 		}
-		if seen[name] {
-			logger.Debugf("Ignoring duplicate device %q", name)
-			continue
-		}
-		devices = append(devices, name)
 	}
 
+	devices = normalizeDeviceList(logger, defaultKind, container.VisibleDevicesFromEnvVar()...)
 	if len(devices) == 0 {
 		return nil, nil
 	}
@@ -116,6 +117,24 @@ func getDevicesFromSpec(logger logger.Interface, ociSpec oci.Spec, cfg *config.C
 	return nil, nil
 }
 
+func normalizeDeviceList(logger logger.Interface, defaultKind string, devices ...string) []string {
+	seen := make(map[string]bool)
+	var normalized []string
+	for _, name := range devices {
+		if !parser.IsQualifiedName(name) {
+			name = fmt.Sprintf("%s=%s", defaultKind, name)
+		}
+		if seen[name] {
+			logger.Debugf("Ignoring duplicate device %q", name)
+			continue
+		}
+		normalized = append(normalized, name)
+		seen[name] = true
+	}
+
+	return normalized
+}
+
 // getAnnotationDevices returns a list of devices specified in the annotations.
 // Keys starting with the specified prefixes are considered and expected to contain a comma-separated list of
 // fully-qualified CDI devices names. If any device name is not fully-quality an error is returned.
@@ -156,7 +175,7 @@ func filterAutomaticDevices(devices []string) []string {
 	var automatic []string
 	for _, device := range devices {
 		vendor, class, _ := parser.ParseDevice(device)
-		if vendor == "runtime.nvidia.com" && class == "gpu" {
+		if vendor == automaticDeviceVendor && class == automaticDeviceClass {
 			automatic = append(automatic, device)
 		}
 	}
@@ -165,6 +184,8 @@ func filterAutomaticDevices(devices []string) []string {
 
 func newAutomaticCDISpecModifier(logger logger.Interface, cfg *config.Config, devices []string) (oci.SpecModifier, error) {
 	logger.Debugf("Generating in-memory CDI specs for devices %v", devices)
+	// TODO: We should try to load the kernel modules and create the device nodes here.
+	// Failures should raise a warning and not error out.
 	spec, err := generateAutomaticCDISpec(logger, cfg, devices)
 	if err != nil {
 		return nil, fmt.Errorf("failed to generate CDI spec: %w", err)

internal/modifier/cdi_test.go

@@ -20,9 +20,49 @@ import (
 	"fmt"
 	"testing"
 
+	"github.com/opencontainers/runtime-spec/specs-go"
+	testlog "github.com/sirupsen/logrus/hooks/test"
 	"github.com/stretchr/testify/require"
+
+	"github.com/NVIDIA/nvidia-container-toolkit/internal/config"
+	"github.com/NVIDIA/nvidia-container-toolkit/internal/oci"
 )
 
+func TestGetDevicesFromSpec(t *testing.T) {
+	logger, _ := testlog.NewNullLogger()
+	testCases := []struct {
+		description     string
+		spec            *specs.Spec
+		config          *config.Config
+		defaultKind     string
+		expectedDevices []string
+	}{
+		{
+			description: "NVIDIA_VISIBLE_DEVICES=all",
+			spec: &specs.Spec{
+				Process: &specs.Process{
+					Env: []string{"NVIDIA_VISIBLE_DEVICES=all"},
+				},
+			},
+			config: func() *config.Config {
+				c, _ := config.GetDefault()
+				return c
+			}(),
+			defaultKind:     "runtime.nvidia.com/gpu",
+			expectedDevices: []string{"runtime.nvidia.com/gpu=all"},
+		},
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.description, func(t *testing.T) {
+			devices, err := getDevicesFromSpec(logger, oci.NewMemorySpec(tc.spec), tc.config, tc.defaultKind)
+			require.NoError(t, err)
+
+			require.EqualValues(t, tc.expectedDevices, devices)
+		})
+	}
+}
+
 func TestGetAnnotationDevices(t *testing.T) {
 	testCases := []struct {
 		description     string

internal/runtime/runtime_factory.go

@@ -111,8 +111,8 @@ func newModeModifier(logger logger.Interface, mode info.RuntimeMode, cfg *config
 		return modifier.NewStableRuntimeModifier(logger, cfg.NVIDIAContainerRuntimeHookConfig.Path), nil
 	case info.RuntimeModeCSV:
 		return modifier.NewCSVModifier(logger, cfg, image)
-	case info.RuntimeModeCDI:
-		return modifier.NewCDIModifier(logger, cfg, ociSpec)
+	case info.RuntimeModeCDI, info.RuntimeModeJitCDI:
+		return modifier.NewCDIModifier(logger, cfg, ociSpec, mode == info.RuntimeModeJitCDI)
 	}
 
 	return nil, fmt.Errorf("invalid runtime mode: %v", cfg.NVIDIAContainerRuntimeConfig.Mode)
@@ -121,7 +121,7 @@ func newModeModifier(logger logger.Interface, mode info.RuntimeMode, cfg *config
 // supportedModifierTypes returns the modifiers supported for a specific runtime mode.
 func supportedModifierTypes(mode info.RuntimeMode) []string {
 	switch mode {
-	case info.RuntimeModeCDI:
+	case info.RuntimeModeCDI, info.RuntimeModeJitCDI:
 		// For CDI mode we make no additional modifications.
 		return []string{"nvidia-hook-remover", "mode"}
 	case info.RuntimeModeCSV: