Create device nodes

cmd/nvidia-ctk-installer/main_test.go

@@ -141,6 +141,9 @@ swarm-resource = ""
     [nvidia-container-runtime.modes.csv]
       mount-spec-path = "/etc/nvidia-container-runtime/host-files-for-container.d"
 
+    [nvidia-container-runtime.modes.jit-cdi]
+      load-kernel-modules = ["nvidia", "nvidia-uvm", "nvidia-modeset"]
+
 [nvidia-container-runtime-hook]
   path = "{{ .toolkitRoot }}/toolkit/nvidia-container-runtime-hook"
   skip-mode-detection = true
@@ -202,6 +205,9 @@ swarm-resource = ""
     [nvidia-container-runtime.modes.csv]
       mount-spec-path = "/etc/nvidia-container-runtime/host-files-for-container.d"
 
+    [nvidia-container-runtime.modes.jit-cdi]
+      load-kernel-modules = ["nvidia", "nvidia-uvm", "nvidia-modeset"]
+
 [nvidia-container-runtime-hook]
   path = "{{ .toolkitRoot }}/toolkit/nvidia-container-runtime-hook"
   skip-mode-detection = true
@@ -266,6 +272,9 @@ swarm-resource = ""
     [nvidia-container-runtime.modes.csv]
       mount-spec-path = "/etc/nvidia-container-runtime/host-files-for-container.d"
 
+    [nvidia-container-runtime.modes.jit-cdi]
+      load-kernel-modules = ["nvidia", "nvidia-uvm", "nvidia-modeset"]
+
 [nvidia-container-runtime-hook]
   path = "{{ .toolkitRoot }}/toolkit/nvidia-container-runtime-hook"
   skip-mode-detection = true
@@ -327,6 +336,9 @@ swarm-resource = ""
     [nvidia-container-runtime.modes.csv]
       mount-spec-path = "/etc/nvidia-container-runtime/host-files-for-container.d"
 
+    [nvidia-container-runtime.modes.jit-cdi]
+      load-kernel-modules = ["nvidia", "nvidia-uvm", "nvidia-modeset"]
+
 [nvidia-container-runtime-hook]
   path = "{{ .toolkitRoot }}/toolkit/nvidia-container-runtime-hook"
   skip-mode-detection = true
@@ -410,6 +422,9 @@ swarm-resource = ""
     [nvidia-container-runtime.modes.csv]
       mount-spec-path = "/etc/nvidia-container-runtime/host-files-for-container.d"
 
+    [nvidia-container-runtime.modes.jit-cdi]
+      load-kernel-modules = ["nvidia", "nvidia-uvm", "nvidia-modeset"]
+
 [nvidia-container-runtime-hook]
   path = "{{ .toolkitRoot }}/toolkit/nvidia-container-runtime-hook"
   skip-mode-detection = true

cmd/nvidia-ctk/system/create-dev-char-symlinks/all.go

@@ -145,21 +145,9 @@ func (m allPossible) getGPUDeviceNodes(gpu int) []deviceNode {
 // getNVCapDeviceNodes generates a list of cap device nodes for a given GPU.
 func (m allPossible) getNVCapDeviceNodes(gpu int) []deviceNode {
 	var selectedCapMinors []nvcaps.MigMinor
-	for gi := 0; ; gi++ {
-		giCap := nvcaps.NewGPUInstanceCap(gpu, gi)
-		giMinor, exist := m.migCaps[giCap]
-		if !exist {
-			break
-		}
-		selectedCapMinors = append(selectedCapMinors, giMinor)
-		for ci := 0; ; ci++ {
-			ciCap := nvcaps.NewComputeInstanceCap(gpu, gi, ci)
-			ciMinor, exist := m.migCaps[ciCap]
-			if !exist {
-				break
-			}
-			selectedCapMinors = append(selectedCapMinors, ciMinor)
-		}
+
+	for _, capMinors := range m.migCaps.FilterForGPU(nvcaps.Index(gpu)) {
+		selectedCapMinors = append(selectedCapMinors, capMinors)
 	}
 
 	var deviceNodes []deviceNode

internal/config/config.go

@@ -121,6 +121,9 @@ func GetDefault() (*Config, error) {
 					AnnotationPrefixes: []string{cdi.AnnotationPrefix},
 					SpecDirs:           cdi.DefaultSpecDirs,
 				},
+				JitCDI: jitCDIModeConfig{
+					LoadKernelModules: []string{"nvidia", "nvidia-uvm", "nvidia-modeset"},
+				},
 			},
 		},
 		NVIDIAContainerRuntimeHookConfig: RuntimeHookConfig{

internal/config/config_test.go

@@ -74,6 +74,9 @@ func TestGetConfig(t *testing.T) {
 							AnnotationPrefixes: []string{"cdi.k8s.io/"},
 							SpecDirs:           []string{"/etc/cdi", "/var/run/cdi"},
 						},
+						JitCDI: jitCDIModeConfig{
+							LoadKernelModules: []string{"nvidia", "nvidia-uvm", "nvidia-modeset"},
+						},
 					},
 				},
 				NVIDIAContainerRuntimeHookConfig: RuntimeHookConfig{
@@ -102,6 +105,7 @@ func TestGetConfig(t *testing.T) {
 				"nvidia-container-runtime.modes.cdi.annotation-prefixes = [\"cdi.k8s.io/\", \"example.vendor.com/\",]",
 				"nvidia-container-runtime.modes.cdi.spec-dirs = [\"/except/etc/cdi\", \"/not/var/run/cdi\",]",
 				"nvidia-container-runtime.modes.csv.mount-spec-path = \"/not/etc/nvidia-container-runtime/host-files-for-container.d\"",
+				"nvidia-container-runtime.modes.jit-cdi.load-kernel-modules = [\"foo\"]",
 				"nvidia-container-runtime-hook.path = \"/foo/bar/nvidia-container-runtime-hook\"",
 				"nvidia-ctk.path = \"/foo/bar/nvidia-ctk\"",
 			},
@@ -134,6 +138,9 @@ func TestGetConfig(t *testing.T) {
 								"/not/var/run/cdi",
 							},
 						},
+						JitCDI: jitCDIModeConfig{
+							LoadKernelModules: []string{"foo"},
+						},
 					},
 				},
 				NVIDIAContainerRuntimeHookConfig: RuntimeHookConfig{
@@ -178,6 +185,9 @@ func TestGetConfig(t *testing.T) {
 								"/var/run/cdi",
 							},
 						},
+						JitCDI: jitCDIModeConfig{
+							LoadKernelModules: []string{"nvidia", "nvidia-uvm", "nvidia-modeset"},
+						},
 					},
 				},
 				NVIDIAContainerRuntimeHookConfig: RuntimeHookConfig{
@@ -213,6 +223,8 @@ func TestGetConfig(t *testing.T) {
 				"spec-dirs = [\"/except/etc/cdi\", \"/not/var/run/cdi\",]",
 				"[nvidia-container-runtime.modes.csv]",
 				"mount-spec-path = \"/not/etc/nvidia-container-runtime/host-files-for-container.d\"",
+				"[nvidia-container-runtime.modes.jit-cdi]",
+				"load-kernel-modules = [\"foo\"]",
 				"[nvidia-container-runtime-hook]",
 				"path = \"/foo/bar/nvidia-container-runtime-hook\"",
 				"[nvidia-ctk]",
@@ -247,6 +259,9 @@ func TestGetConfig(t *testing.T) {
 								"/not/var/run/cdi",
 							},
 						},
+						JitCDI: jitCDIModeConfig{
+							LoadKernelModules: []string{"foo"},
+						},
 					},
 				},
 				NVIDIAContainerRuntimeHookConfig: RuntimeHookConfig{
@@ -283,6 +298,9 @@ func TestGetConfig(t *testing.T) {
 							AnnotationPrefixes: []string{"cdi.k8s.io/"},
 							SpecDirs:           []string{"/etc/cdi", "/var/run/cdi"},
 						},
+						JitCDI: jitCDIModeConfig{
+							LoadKernelModules: []string{"nvidia", "nvidia-uvm", "nvidia-modeset"},
+						},
 					},
 				},
 				NVIDIAContainerRuntimeHookConfig: RuntimeHookConfig{
@@ -322,6 +340,9 @@ func TestGetConfig(t *testing.T) {
 							AnnotationPrefixes: []string{"cdi.k8s.io/"},
 							SpecDirs:           []string{"/etc/cdi", "/var/run/cdi"},
 						},
+						JitCDI: jitCDIModeConfig{
+							LoadKernelModules: []string{"nvidia", "nvidia-uvm", "nvidia-modeset"},
+						},
 					},
 				},
 				NVIDIAContainerRuntimeHookConfig: RuntimeHookConfig{

internal/config/runtime.go

@@ -29,8 +29,9 @@ type RuntimeConfig struct {
 
 // modesConfig defines (optional) per-mode configs
 type modesConfig struct {
-	CSV csvModeConfig `toml:"csv"`
-	CDI cdiModeConfig `toml:"cdi"`
+	CSV    csvModeConfig    `toml:"csv"`
+	CDI    cdiModeConfig    `toml:"cdi"`
+	JitCDI jitCDIModeConfig `toml:"jit-cdi"`
 }
 
 type cdiModeConfig struct {
@@ -45,3 +46,11 @@ type cdiModeConfig struct {
 type csvModeConfig struct {
 	MountSpecPath string `toml:"mount-spec-path"`
 }
+
+type jitCDIModeConfig struct {
+	// LoadKernelModules defines the names of the kernel modules that should be
+	// loaded before generating a just-in-time CDI specification.
+	// The module names must start with `nvidia` and if no modules are specified
+	// no kernel modules are loaded.
+	LoadKernelModules []string `toml:"load-kernel-modules"`
+}

internal/config/toml_test.go

@@ -74,6 +74,9 @@ spec-dirs = ["/etc/cdi", "/var/run/cdi"]
 [nvidia-container-runtime.modes.csv]
 mount-spec-path = "/etc/nvidia-container-runtime/host-files-for-container.d"
 
+[nvidia-container-runtime.modes.jit-cdi]
+load-kernel-modules = ["nvidia", "nvidia-uvm", "nvidia-modeset"]
+
 [nvidia-container-runtime-hook]
 path = "nvidia-container-runtime-hook"
 skip-mode-detection = false

internal/info/proc/devices/builder.go

@@ -45,7 +45,7 @@ func New(opts ...Option) Devices {
 type Option func(*builder)
 
 // WithDeviceToMajor specifies an explicit device name to major number map.
-func WithDeviceToMajor(deviceToMajor map[string]int) Option {
+func WithDeviceToMajor(deviceToMajor map[string]uint32) Option {
 	return func(b *builder) {
 		b.asMap = make(devices)
 		for name, major := range deviceToMajor {

internal/info/proc/devices/devices.go

@@ -45,7 +45,7 @@ const (
 type Name string
 
 // Major represents a device major as specified under /proc/devices
-type Major int
+type Major uint32
 
 // Devices represents the set of devices under /proc/devices
 //
@@ -130,8 +130,8 @@ func nvidiaDeviceFrom(reader io.Reader) (Devices, error) {
 	return nvidiaDevices, nil
 }
 
-func devicesFrom(reader io.Reader) map[string]int {
-	allDevices := make(map[string]int)
+func devicesFrom(reader io.Reader) map[string]uint32 {
+	allDevices := make(map[string]uint32)
 	scanner := bufio.NewScanner(reader)
 	for scanner.Scan() {
 		device, major, err := processProcDeviceLine(scanner.Text())
@@ -143,11 +143,11 @@ func devicesFrom(reader io.Reader) map[string]int {
 	return allDevices
 }
 
-func processProcDeviceLine(line string) (string, int, error) {
+func processProcDeviceLine(line string) (string, uint32, error) {
 	trimmed := strings.TrimSpace(line)
 
 	var name string
-	var major int
+	var major uint32
 
 	n, _ := fmt.Sscanf(trimmed, "%d %s", &major, &name)
 	if n == 2 {

internal/info/proc/devices/devices_test.go

@@ -25,7 +25,7 @@ import (
 )
 
 func TestNvidiaDevices(t *testing.T) {
-	perDriverDeviceMaps := map[string]map[string]int{
+	perDriverDeviceMaps := map[string]map[string]uint32{
 		"pre550": {
 			"nvidia-frontend": 195,
 			"nvidia-nvlink":   234,
@@ -100,7 +100,7 @@ func TestProcessDeviceFileLine(t *testing.T) {
 	testCases := []struct {
 		line  string
 		name  string
-		major int
+		major uint32
 		err   bool
 	}{
 		{"", "", 0, true},

internal/lookup/root/root.go

@@ -17,12 +17,15 @@
 package root
 
 import (
+	"errors"
+	"fmt"
 	"os"
 	"path/filepath"
 	"strings"
 
 	"github.com/NVIDIA/nvidia-container-toolkit/internal/logger"
 	"github.com/NVIDIA/nvidia-container-toolkit/internal/lookup"
+	"github.com/NVIDIA/nvidia-container-toolkit/internal/system/nvmodules"
 )
 
 // Driver represents a filesystem in which a set of drivers or devices is defined.
@@ -125,3 +128,20 @@ func xdgDataDirs() []string {
 
 	return []string{"/usr/local/share", "/usr/share"}
 }
+
+// LoadKmods loads the specified kernel modules in the driver root.
+// Errors in loading a module do not prevent other modules from being attempted.
+func (r *Driver) LoadKernelModules(moduleNames ...string) error {
+	modules := nvmodules.New(
+		nvmodules.WithLogger(r.logger),
+		nvmodules.WithRoot(r.Root),
+	)
+
+	var errs error
+	for _, moduleName := range moduleNames {
+		if err := modules.Load(moduleName); err != nil {
+			errs = errors.Join(errs, fmt.Errorf("failed to load kernel module %q: %w", moduleName, err))
+		}
+	}
+	return errs
+}

internal/modifier/cdi.go

@@ -22,19 +22,23 @@ import (
 
 	"tags.cncf.io/container-device-interface/pkg/parser"
 
+	"github.com/NVIDIA/go-nvlib/pkg/nvlib/device"
+
 	"github.com/NVIDIA/nvidia-container-toolkit/internal/config"
 	"github.com/NVIDIA/nvidia-container-toolkit/internal/config/image"
 	"github.com/NVIDIA/nvidia-container-toolkit/internal/logger"
+	"github.com/NVIDIA/nvidia-container-toolkit/internal/lookup/root"
 	"github.com/NVIDIA/nvidia-container-toolkit/internal/modifier/cdi"
 	"github.com/NVIDIA/nvidia-container-toolkit/internal/oci"
+	"github.com/NVIDIA/nvidia-container-toolkit/internal/system/nvdevices"
 	"github.com/NVIDIA/nvidia-container-toolkit/pkg/nvcdi"
 	"github.com/NVIDIA/nvidia-container-toolkit/pkg/nvcdi/spec"
 )
 
 // 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) {
+func NewCDIModifier(logger logger.Interface, cfg *config.Config, driver *root.Driver, ociSpec oci.Spec) (oci.SpecModifier, error) {
 	devices, err := getDevicesFromSpec(logger, ociSpec, cfg)
 	if err != nil {
 		return nil, fmt.Errorf("failed to get required devices from OCI specification: %v", err)
@@ -50,7 +54,7 @@ func NewCDIModifier(logger logger.Interface, cfg *config.Config, ociSpec oci.Spe
 		return nil, fmt.Errorf("requesting a CDI device with vendor 'runtime.nvidia.com' is not supported when requesting other CDI devices")
 	}
 	if len(automaticDevices) > 0 {
-		automaticModifier, err := newAutomaticCDISpecModifier(logger, cfg, automaticDevices)
+		automaticModifier, err := newAutomaticCDISpecModifier(logger, cfg, driver, automaticDevices)
 		if err == nil {
 			return automaticModifier, nil
 		}
@@ -163,9 +167,9 @@ func filterAutomaticDevices(devices []string) []string {
 	return automatic
 }
 
-func newAutomaticCDISpecModifier(logger logger.Interface, cfg *config.Config, devices []string) (oci.SpecModifier, error) {
+func newAutomaticCDISpecModifier(logger logger.Interface, cfg *config.Config, driver *root.Driver, devices []string) (oci.SpecModifier, error) {
 	logger.Debugf("Generating in-memory CDI specs for devices %v", devices)
-	spec, err := generateAutomaticCDISpec(logger, cfg, devices)
+	spec, err := generateAutomaticCDISpec(logger, cfg, driver, devices)
 	if err != nil {
 		return nil, fmt.Errorf("failed to generate CDI spec: %w", err)
 	}
@@ -180,7 +184,7 @@ func newAutomaticCDISpecModifier(logger logger.Interface, cfg *config.Config, de
 	return cdiModifier, nil
 }
 
-func generateAutomaticCDISpec(logger logger.Interface, cfg *config.Config, devices []string) (spec.Interface, error) {
+func generateAutomaticCDISpec(logger logger.Interface, cfg *config.Config, driver *root.Driver, devices []string) (spec.Interface, error) {
 	cdilib, err := nvcdi.New(
 		nvcdi.WithLogger(logger),
 		nvcdi.WithNVIDIACDIHookPath(cfg.NVIDIACTKConfig.Path),
@@ -192,12 +196,19 @@ func generateAutomaticCDISpec(logger logger.Interface, cfg *config.Config, devic
 		return nil, fmt.Errorf("failed to construct CDI library: %w", err)
 	}
 
-	identifiers := []string{}
+	// TODO: Consider moving this into the nvcdi API.
+	if err := driver.LoadKernelModules(cfg.NVIDIAContainerRuntimeConfig.Modes.JitCDI.LoadKernelModules...); err != nil {
+		logger.Warningf("Ignoring error(s) loading kernel modules: %v", err)
+	}
+
+	var identifiers []string
 	for _, device := range devices {
 		_, _, id := parser.ParseDevice(device)
 		identifiers = append(identifiers, id)
 	}
 
+	tryCreateDeviceNodes(logger, driver, identifiers...)
+
 	deviceSpecs, err := cdilib.GetDeviceSpecsByID(identifiers...)
 	if err != nil {
 		return nil, fmt.Errorf("failed to get CDI device specs: %w", err)
@@ -215,3 +226,27 @@ func generateAutomaticCDISpec(logger logger.Interface, cfg *config.Config, devic
 		spec.WithClass("gpu"),
 	)
 }
+
+func tryCreateDeviceNodes(logger logger.Interface, driver *root.Driver, identifiers ...string) {
+	devices, err := nvdevices.New(
+		nvdevices.WithLogger(logger),
+		nvdevices.WithDevRoot(driver.Root),
+	)
+	if err != nil {
+		logger.Warningf("Failed to create devices library: %v", err)
+		return
+	}
+	if err := devices.CreateNVIDIAControlDevices(); err != nil {
+		logger.Warningf("Failed to create control devices: %v", err)
+	}
+	if err := devices.CreateNVIDIACapsControlDeviceNodes(); err != nil {
+		logger.Warningf("Failed to create nvidia-caps control devices: %v", err)
+	}
+
+	for _, id := range identifiers {
+		identifier := device.Identifier(id)
+		if err := devices.CreateDeviceNodes(identifier); err != nil {
+			logger.Warningf("Error creating device nodes for %v: %v", identifier, err)
+		}
+	}
+}