feat(vmclass): add defaultCoreFraction field

api/core/v1alpha2/virtual_machine.go

@@ -165,8 +165,9 @@ type CPUSpec struct {
 	Cores int `json:"cores"`
 
 	// Guaranteed share of CPU that will be allocated to the VM. Specified as a percentage.
-	// +kubebuilder:default:="100%"
-	// +kubebuilder:validation:Enum:={"5%", "10%", "25%", "50%", "100%"}
+	// The range of available values is defined in the VirtualMachineClass sizing policy.
+	// If not specified, the default value from the VirtualMachineClass will be used.
+	// +kubebuilder:validation:Pattern=`^(100|[1-9][0-9]?|[1-9])%$`
 	CoreFraction string `json:"coreFraction,omitempty"`
 }
 

api/core/v1alpha2/virtual_machine_class.go

@@ -119,6 +119,9 @@ type SizingPolicy struct {
 	Memory *SizingPolicyMemory `json:"memory,omitempty"`
 	// Allowed values of the `coreFraction` parameter.
 	CoreFractions []CoreFractionValue `json:"coreFractions,omitempty"`
+	// Default core fraction value for the VirtualMachineClass.
+	// This value will be used when creating a VM without an explicitly specified coreFraction.
+	DefaultCoreFraction *CoreFractionValue `json:"defaultCoreFraction,omitempty"`
 	// Allowed values of the `dedicatedCores` parameter.
 	DedicatedCores []bool `json:"dedicatedCores,omitempty"`
 	// The policy applies for a specified range of the number of CPU cores.

api/core/v1alpha3/virtual_machine_class.go

@@ -117,6 +117,8 @@ type SizingPolicy struct {
 	Memory *SizingPolicyMemory `json:"memory,omitempty"`
 	// Allowed values of the `coreFraction` parameter in percentages (e.g., "5%", "10%", "25%", "50%", "100%").
 	CoreFractions []CoreFractionValue `json:"coreFractions,omitempty"`
+	// Default core fraction value for the VirtualMachineClass.
+	DefaultCoreFraction *CoreFractionValue `json:"defaultCoreFraction,omitempty"`
 	// Allowed values of the `dedicatedCores` parameter.
 	DedicatedCores []bool `json:"dedicatedCores,omitempty"`
 	// The policy applies for a specified range of the number of CPU cores.

api/core/v1alpha3/virtual_machine_class_conversion.go

@@ -124,6 +124,20 @@ func convertSpecV3ToV2(v3Spec VirtualMachineClassSpec) (v1alpha2.VirtualMachineC
 				}
 			}
 
+			if v3Policy.DefaultCoreFraction != nil {
+				fractionStr := string(*v3Policy.DefaultCoreFraction)
+				if !regexp.MustCompile(`^([1-9]|[1-9][0-9]|100)%$`).MatchString(fractionStr) {
+					return v1alpha2.VirtualMachineClassSpec{}, fmt.Errorf("spec.sizingPolicies[%d].defaultCoreFraction: value must be a percentage between 1%% and 100%% (e.g., 5%%, 10%%, 50%%), got %q", i, fractionStr)
+				}
+				fractionStr = fractionStr[:len(fractionStr)-1]
+				fractionInt, err := strconv.Atoi(fractionStr)
+				if err != nil {
+					return v1alpha2.VirtualMachineClassSpec{}, fmt.Errorf("failed to parse default core fraction: %w", err)
+				}
+				v2Fraction := v1alpha2.CoreFractionValue(fractionInt)
+				v2Policy.DefaultCoreFraction = &v2Fraction
+			}
+
 			v2Spec.SizingPolicies[i] = v2Policy
 		}
 	}
@@ -191,6 +205,11 @@ func convertSpecV2ToV3(v2Spec v1alpha2.VirtualMachineClassSpec) VirtualMachineCl
 				}
 			}
 
+			if v2Policy.DefaultCoreFraction != nil {
+				v3Fraction := CoreFractionValue(fmt.Sprintf("%d%%", *v2Policy.DefaultCoreFraction))
+				v3Policy.DefaultCoreFraction = &v3Fraction
+			}
+
 			v3Spec.SizingPolicies[i] = v3Policy
 		}
 	}

crds/doc-ru-virtualmachineclasses.yaml

@@ -134,6 +134,10 @@ spec:
                       coreFractions:
                         description: |
                           Допустимые значения параметра `coreFraction` в процентах (например, "5%", "10%", "25%", "50%", "100%").
+                      defaultCoreFraction:
+                        description: |
+                          Значение `coreFraction` по умолчанию для VirtualMachineClass.
+                          Используется при создании ВМ, если `coreFraction` не задан явно.
                       cores:
                         description: |
                           Политика применяется для заданного диапазона числа ядер CPU.

crds/doc-ru-virtualmachines.yaml

@@ -383,7 +383,10 @@ spec:
                   properties:
                     coreFraction:
                       description: |
-                        Гарантированная доля времени CPU, которая будет выделена ВМ. Указывается в процентах. Диапазон доступных значений задаётся параметром `sizePolicy` в используемом VirtualMachineClass; если он не указан, используйте значения в диапазоне 1–100%.
+                        Гарантированная доля времени CPU, выделяемая ВМ. Указывается в процентах.
+                        Допустимый диапазон значений определяется параметром `sizePolicy` в используемом VirtualMachineClass. Если `sizePolicy` не задан, используйте значения в диапазоне `1–100%`.
+                        Если значение параметра не указано, применяется значение по умолчанию из `sizePolicy` используемого VirtualMachineClass.
+                        Если значение по умолчанию в классе не задано, применяется `100%`.
                     cores:
                       description: |
                         Количество ядер.

crds/virtualmachineclasses.yaml

@@ -281,6 +281,13 @@ spec:
                         items:
                           type: boolean
                         type: array
+                      defaultCoreFraction:
+                        description: |-
+                          Default `coreFraction` value for the VirtualMachineClass.
+                          Used when creating a VM when `coreFraction` is not specified.
+                        maximum: 100
+                        minimum: 1
+                        type: integer
                       memory:
                         description: Memory sizing policy.
                         properties:
@@ -775,6 +782,9 @@ spec:
                         items:
                           type: boolean
                         type: array
+                      defaultCoreFraction:
+                        description: Default `coreFraction` value for the VirtualMachineClass.
+                        type: string
                       memory:
                         description: Memory sizing policy.
                         properties:

crds/virtualmachines.yaml

@@ -38,7 +38,7 @@ spec:
           properties:
             spec:
               x-kubernetes-validations:
-                - rule: "self.cpu.coreFraction.endsWith('%') && int(self.cpu.coreFraction.replace('%', '')) >= 1 && int(self.cpu.coreFraction.replace('%', '')) <= 100"
+                - rule: "!has(self.cpu.coreFraction) || (self.cpu.coreFraction.endsWith('%') && int(self.cpu.coreFraction.replace('%', '')) >= 1 && int(self.cpu.coreFraction.replace('%', '')) <= 100)"
                   message: "Core fraction must be between 1% and 100%."
               type: object
               required:
@@ -888,9 +888,11 @@ spec:
                       description: Number of cores.
                     coreFraction:
                       type: string
-                      default: "100%"
                       description: |
-                        Guaranteed share of CPU time that will be allocated to the VM. Specified as a percentage. The range of available values is set in the `sizePolicy` parameter of the VirtualMachineClass; if it is not set, use values within the 1–100% range.
+                        Guaranteed share of CPU time allocated to the VM. Specified as a percentage.
+                        The allowed range is defined by `sizePolicy` in the selected VirtualMachineClass. If `sizePolicy` is not set, use values in the `1–100%` range.
+                        If the parameter is not specified, the default value from the class `sizePolicy` is used. 
+                        If no default is set in the class, `100%` is applied.
 
                 memory:
                   type: object

images/virtualization-artifact/pkg/controller/vm/internal/defaulter/core_fraction.go

@@ -0,0 +1,91 @@
+/*
+Copyright 2025 Flant JSC
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+     http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package defaulter
+
+import (
+	"context"
+	"fmt"
+
+	"k8s.io/apimachinery/pkg/types"
+	"sigs.k8s.io/controller-runtime/pkg/client"
+
+	"github.com/deckhouse/virtualization/api/core/v1alpha2"
+	"github.com/deckhouse/virtualization/api/core/v1alpha3"
+)
+
+type CoreFractionDefaulter struct {
+	client client.Client
+}
+
+func NewCoreFractionDefaulter(client client.Client) *CoreFractionDefaulter {
+	return &CoreFractionDefaulter{
+		client: client,
+	}
+}
+
+func (d *CoreFractionDefaulter) Default(ctx context.Context, vm *v1alpha2.VirtualMachine) error {
+	// Skip if coreFraction is already set.
+	if vm.Spec.CPU.CoreFraction != "" {
+		return nil
+	}
+
+	// Skip if vmClassName is not set (will be handled by validation later).
+	if vm.Spec.VirtualMachineClassName == "" {
+		return nil
+	}
+
+	// Get the VMClass.
+	vmClass := &v1alpha3.VirtualMachineClass{}
+	err := d.client.Get(ctx, types.NamespacedName{Name: vm.Spec.VirtualMachineClassName}, vmClass)
+	if err != nil {
+		return fmt.Errorf("failed to get VirtualMachineClass %q: %w", vm.Spec.VirtualMachineClassName, err)
+	}
+
+	// Find the matching sizing policy based on CPU cores.
+	defaultCoreFraction := d.getDefaultCoreFraction(vm, vmClass)
+	if defaultCoreFraction != "" {
+		vm.Spec.CPU.CoreFraction = defaultCoreFraction
+	}
+
+	return nil
+}
+
+// getDefaultCoreFraction finds the default core fraction from the VMClass sizing policy
+// that matches the VM's CPU cores count.
+func (d *CoreFractionDefaulter) getDefaultCoreFraction(vm *v1alpha2.VirtualMachine, vmClass *v1alpha3.VirtualMachineClass) string {
+	const defaultValue = "100%"
+
+	if vmClass == nil || len(vmClass.Spec.SizingPolicies) == 0 {
+		return defaultValue
+	}
+
+	for _, sp := range vmClass.Spec.SizingPolicies {
+		if sp.Cores == nil {
+			continue
+		}
+
+		// Check if VM's cores fall within this policy's range.
+		if vm.Spec.CPU.Cores >= sp.Cores.Min && vm.Spec.CPU.Cores <= sp.Cores.Max {
+			if sp.DefaultCoreFraction != nil {
+				return string(*sp.DefaultCoreFraction)
+			}
+			return defaultValue
+		}
+	}
+
+	return defaultValue
+}

images/virtualization-artifact/pkg/controller/vm/vm_webhook.go

@@ -131,6 +131,7 @@ func NewDefaulter(client client.Client, vmClassService *service.VirtualMachineCl
 	return &Defaulter{
 		defaulters: []VirtualMachineDefaulter{
 			defaulter.NewVirtualMachineClassNameDefaulter(client, vmClassService),
+			defaulter.NewCoreFractionDefaulter(client),
 		},
 		log: log.With("webhook", "mutating"),
 	}

images/virtualization-artifact/pkg/controller/vmclass/internal/validators/default_core_fraction_validator.go

@@ -0,0 +1,60 @@
+/*
+Copyright 2024 Flant JSC
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+     http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package validators
+
+import (
+	"context"
+	"fmt"
+	"slices"
+
+	"sigs.k8s.io/controller-runtime/pkg/webhook/admission"
+
+	"github.com/deckhouse/virtualization/api/core/v1alpha2"
+)
+
+type DefaultCoreFractionValidator struct{}
+
+func NewDefaultCoreFractionValidator() *DefaultCoreFractionValidator {
+	return &DefaultCoreFractionValidator{}
+}
+
+func (v *DefaultCoreFractionValidator) ValidateCreate(_ context.Context, vmclass *v1alpha2.VirtualMachineClass) (admission.Warnings, error) {
+	return nil, v.validate(vmclass)
+}
+
+func (v *DefaultCoreFractionValidator) ValidateUpdate(_ context.Context, _, newVMClass *v1alpha2.VirtualMachineClass) (admission.Warnings, error) {
+	return nil, v.validate(newVMClass)
+}
+
+func (v *DefaultCoreFractionValidator) validate(vmclass *v1alpha2.VirtualMachineClass) error {
+	for i, policy := range vmclass.Spec.SizingPolicies {
+		if policy.DefaultCoreFraction == nil {
+			continue
+		}
+
+		if len(policy.CoreFractions) == 0 {
+			continue
+		}
+
+		if !slices.Contains(policy.CoreFractions, *policy.DefaultCoreFraction) {
+			return fmt.Errorf("vmclass %s sizingPolicy[%d]: defaultCoreFraction %d is not in the allowed coreFractions list %v",
+				vmclass.Name, i, *policy.DefaultCoreFraction, policy.CoreFractions)
+		}
+	}
+
+	return nil
+}

images/virtualization-artifact/pkg/controller/vmclass/vmclass_webhook.go

@@ -48,6 +48,7 @@ func NewValidator(client client.Client, log *log.Logger, recorder eventrecord.Ev
 			validators.NewSizingPoliciesValidator(client),
 			validators.NewPolicyChangesValidator(recorder),
 			validators.NewSingleDefaultClassValidator(client, vmClassService),
+			validators.NewDefaultCoreFractionValidator(),
 		},
 		log: log.With("webhook", "validation"),
 	}