neonvm: Add Guest.MemhpAutoMovableRatio (#1271)

Allow to override default movable ratio that is set in
neonvm-controller.

related to neondatabase/cloud#23865

neonvm/apis/neonvm/v1/virtualmachine_types.go

@@ -240,7 +240,11 @@ const (
 type Guest struct {
 	// +optional
 	KernelImage *string `json:"kernelImage,omitempty"`
-
+	// Set the maximum MOVABLE:KERNEL memory ratio in %.
+	// Kernel default is 301%.
+	// See https://docs.kernel.org/admin-guide/mm/memory-hotplug.html
+	// +optional
+	MemhpAutoMovableRatio *string `json:"memhpAutoMovableRatio,omitempty"`
 	// +optional
 	AppendKernelCmdline *string `json:"appendKernelCmdline,omitempty"`
 

neonvm/config/crd/bases/vm.neon.tech_virtualmachines.yaml

@@ -2729,6 +2729,12 @@ spec:
                     type: array
                   kernelImage:
                     type: string
+                  memhpAutoMovableRatio:
+                    description: |-
+                      Set the maximum MOVABLE:KERNEL memory ratio in %.
+                      Kernel default is 301%.
+                      See https://docs.kernel.org/admin-guide/mm/memory-hotplug.html
+                    type: string
                   memorySlotSize:
                     anyOf:
                     - type: integer

pkg/neonvm/controllers/vm_controller.go

@@ -1422,10 +1422,16 @@ func podSpec(
 						if config.DisableRunnerCgroup {
 							cmd = append(cmd, "-skip-cgroup-management")
 						}
+
+						memhpAutoMovableRatio := config.MemhpAutoMovableRatio
+						if specValue := vm.Spec.Guest.MemhpAutoMovableRatio; specValue != nil {
+							memhpAutoMovableRatio = *specValue
+						}
+
 						cmd = append(
 							cmd,
 							"-qemu-disk-cache-settings", config.QEMUDiskCacheSettings,
-							"-memhp-auto-movable-ratio", config.MemhpAutoMovableRatio,
+							"-memhp-auto-movable-ratio", memhpAutoMovableRatio,
 						)
 						// put these last, so that the earlier args are easier to see (because these
 						// can get quite large)