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arm64.go
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arm64.go
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/* 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.
*
* Copyright 2021
*
*/
/*
* arm64 utilities are in the webhooks package because they are used both
* by validation and mutation webhooks.
*/
package webhooks
import (
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
k8sfield "k8s.io/apimachinery/pkg/util/validation/field"
v1 "kubevirt.io/api/core/v1"
)
var _false bool = false
const (
defaultCPUModel = v1.CPUModeHostPassthrough
)
// ValidateVirtualMachineInstanceArm64Setting is a validation function for validating-webhook to filter unsupported setting on Arm64
func ValidateVirtualMachineInstanceArm64Setting(field *k8sfield.Path, spec *v1.VirtualMachineInstanceSpec) []metav1.StatusCause {
var statusCauses []metav1.StatusCause
validateBootOptions(field, spec, &statusCauses)
validateCPUModel(field, spec, &statusCauses)
validateDiskBus(field, spec, &statusCauses)
validateWatchdog(field, spec, &statusCauses)
validateSoundDevice(field, spec, &statusCauses)
return statusCauses
}
func validateBootOptions(field *k8sfield.Path, spec *v1.VirtualMachineInstanceSpec, statusCauses *[]metav1.StatusCause) {
if spec.Domain.Firmware != nil && spec.Domain.Firmware.Bootloader != nil {
if spec.Domain.Firmware.Bootloader.BIOS != nil {
*statusCauses = append(*statusCauses, metav1.StatusCause{
Type: metav1.CauseTypeFieldValueNotSupported,
Message: "Arm64 does not support bios boot, please change to uefi boot",
Field: field.Child("domain", "firmware", "bootloader", "bios").String(),
})
}
if spec.Domain.Firmware.Bootloader.EFI != nil {
// When EFI is enable, secureboot is enabled by default, so here check two condition
// 1 is EFI is enabled without Secureboot setting
// 2 is both EFI and Secureboot enabled
if spec.Domain.Firmware.Bootloader.EFI.SecureBoot == nil || (spec.Domain.Firmware.Bootloader.EFI.SecureBoot != nil && *spec.Domain.Firmware.Bootloader.EFI.SecureBoot) {
*statusCauses = append(*statusCauses, metav1.StatusCause{
Type: metav1.CauseTypeFieldValueNotSupported,
Message: "UEFI secure boot is currently not supported on aarch64 Arch",
Field: field.Child("domain", "firmware", "bootloader", "efi", "secureboot").String(),
})
}
}
}
}
func validateCPUModel(field *k8sfield.Path, spec *v1.VirtualMachineInstanceSpec, statusCauses *[]metav1.StatusCause) {
if spec.Domain.CPU != nil && (&spec.Domain.CPU.Model != nil) && spec.Domain.CPU.Model == "host-model" {
*statusCauses = append(*statusCauses, metav1.StatusCause{
Type: metav1.CauseTypeFieldValueNotSupported,
Message: "Arm64 not support CPU host-model",
Field: field.Child("domain", "cpu", "model").String(),
})
}
}
func validateDiskBus(field *k8sfield.Path, spec *v1.VirtualMachineInstanceSpec, statusCauses *[]metav1.StatusCause) {
if spec.Domain.Devices.Disks != nil {
// checkIfBusAvailable: if bus type is nil, virtio, scsi return true, otherwise, return false
checkIfBusAvailable := func(bus v1.DiskBus) bool {
if bus == "" || bus == v1.DiskBusVirtio || bus == v1.DiskBusSCSI {
return true
}
return false
}
for i, disk := range spec.Domain.Devices.Disks {
if disk.Disk != nil && !checkIfBusAvailable(disk.Disk.Bus) {
*statusCauses = append(*statusCauses, metav1.StatusCause{
Type: metav1.CauseTypeFieldValueNotSupported,
Message: "Arm64 not support this disk bus type, please use virtio or scsi",
Field: field.Child("domain", "devices", "disks").Index(i).Child("disk", "bus").String(),
})
}
if disk.CDRom != nil && !checkIfBusAvailable(disk.CDRom.Bus) {
*statusCauses = append(*statusCauses, metav1.StatusCause{
Type: metav1.CauseTypeFieldValueNotSupported,
Message: "Arm64 not support this disk bus type, please use virtio or scsi",
Field: field.Child("domain", "devices", "disks").Index(i).Child("cdrom", "bus").String(),
})
}
if disk.LUN != nil && !checkIfBusAvailable(disk.LUN.Bus) {
*statusCauses = append(*statusCauses, metav1.StatusCause{
Type: metav1.CauseTypeFieldValueNotSupported,
Message: "Arm64 not support this disk bus type, please use virtio or scsi",
Field: field.Child("domain", "devices", "disks").Index(i).Child("lun", "bus").String(),
})
}
}
}
}
func validateWatchdog(field *k8sfield.Path, spec *v1.VirtualMachineInstanceSpec, statusCauses *[]metav1.StatusCause) {
if spec.Domain.Devices.Watchdog != nil {
*statusCauses = append(*statusCauses, metav1.StatusCause{
Type: metav1.CauseTypeFieldValueNotSupported,
Message: "Arm64 not support Watchdog device",
Field: field.Child("domain", "devices", "watchdog").String(),
})
}
}
func validateSoundDevice(field *k8sfield.Path, spec *v1.VirtualMachineInstanceSpec, statusCauses *[]metav1.StatusCause) {
if spec.Domain.Devices.Sound != nil {
*statusCauses = append(*statusCauses, metav1.StatusCause{
Type: metav1.CauseTypeFieldValueNotSupported,
Message: "Arm64 not support sound device",
Field: field.Child("domain", "devices", "sound").String(),
})
}
}
// setDefaultCPUModel set default cpu model to host-passthrough
func setDefaultArm64CPUModel(spec *v1.VirtualMachineInstanceSpec) {
if spec.Domain.CPU == nil {
spec.Domain.CPU = &v1.CPU{}
}
if spec.Domain.CPU.Model == "" {
spec.Domain.CPU.Model = defaultCPUModel
}
}
// setDefaultBootloader set default bootloader to uefi boot
func setDefaultArm64Bootloader(spec *v1.VirtualMachineInstanceSpec) {
if spec.Domain.Firmware == nil || spec.Domain.Firmware.Bootloader == nil {
if spec.Domain.Firmware == nil {
spec.Domain.Firmware = &v1.Firmware{}
}
if spec.Domain.Firmware.Bootloader == nil {
spec.Domain.Firmware.Bootloader = &v1.Bootloader{}
}
spec.Domain.Firmware.Bootloader.EFI = &v1.EFI{}
spec.Domain.Firmware.Bootloader.EFI.SecureBoot = &_false
}
}
// setDefaultDisksBus set default Disks Bus, because sata is not supported by qemu-kvm of Arm64
func setDefaultArm64DisksBus(spec *v1.VirtualMachineInstanceSpec) {
bus := v1.DiskBusVirtio
for i := range spec.Domain.Devices.Disks {
disk := &spec.Domain.Devices.Disks[i].DiskDevice
if disk.Disk != nil && disk.Disk.Bus == "" {
disk.Disk.Bus = bus
}
if disk.CDRom != nil && disk.CDRom.Bus == "" {
disk.CDRom.Bus = bus
}
if disk.LUN != nil && disk.LUN.Bus == "" {
disk.LUN.Bus = bus
}
}
}
// SetArm64Defaults is mutating function for mutating-webhook
func SetArm64Defaults(spec *v1.VirtualMachineInstanceSpec) {
setDefaultArm64CPUModel(spec)
setDefaultArm64Bootloader(spec)
setDefaultArm64DisksBus(spec)
}