def get_disk_bus_for_device_type(virt_type,
image_meta,
device_type="disk",
instance=None):
"""Determine the best disk bus to use for a device type.
Considering the currently configured virtualization
type, return the optimal disk_bus to use for a given
device type. For example, for a disk on KVM it will
return 'virtio', while for a CDROM it will return 'ide'
on x86_64 and 'scsi' on ppc64.
Returns the disk_bus, or returns None if the device
type is not supported for this virtualization
"""
# Prefer a disk bus set against the image first of all
key = "hw_" + device_type + "_bus"
disk_bus = image_meta.get('properties', {}).get(key)
if disk_bus is not None:
if not is_disk_bus_valid_for_virt(virt_type, disk_bus):
raise exception.UnsupportedHardware(model=disk_bus,
virt=virt_type)
return disk_bus
# Otherwise pick a hypervisor default disk bus
if virt_type == "uml":
if device_type == "disk":
return "uml"
elif virt_type == "lxc":
return "lxc"
elif virt_type == "xen":
guest_vm_mode = None
if instance:
guest_vm_mode = vm_mode.get_from_instance(instance)
if guest_vm_mode == vm_mode.HVM:
return "ide"
else:
return "xen"
elif virt_type in ("qemu", "kvm"):
if device_type == "cdrom":
guestarch = libvirt_utils.get_arch(image_meta)
if guestarch in (arch.PPC, arch.PPC64, arch.S390, arch.S390X):
return "scsi"
else:
return "ide"
elif device_type == "disk":
return "virtio"
elif device_type == "floppy":
return "fdc"
elif virt_type == "parallels":
if device_type == "cdrom":
return "ide"
elif device_type == "disk":
return "sata"
else:
# If virt-type not in list then it is unsupported
raise exception.UnsupportedVirtType(virt=virt_type)
return None
def is_vif_model_valid_for_virt(virt_type, vif_model):
valid_models = {
'qemu': [
network_model.VIF_MODEL_VIRTIO, network_model.VIF_MODEL_NE2K_PCI,
network_model.VIF_MODEL_PCNET, network_model.VIF_MODEL_RTL8139,
network_model.VIF_MODEL_E1000, network_model.VIF_MODEL_SPAPR_VLAN
],
'kvm': [
network_model.VIF_MODEL_VIRTIO, network_model.VIF_MODEL_NE2K_PCI,
network_model.VIF_MODEL_PCNET, network_model.VIF_MODEL_RTL8139,
network_model.VIF_MODEL_E1000, network_model.VIF_MODEL_SPAPR_VLAN
],
'xen': [
network_model.VIF_MODEL_NETFRONT, network_model.VIF_MODEL_NE2K_PCI,
network_model.VIF_MODEL_PCNET, network_model.VIF_MODEL_RTL8139,
network_model.VIF_MODEL_E1000
],
'lxc': [],
'uml': [],
'parallels': [
network_model.VIF_MODEL_VIRTIO, network_model.VIF_MODEL_RTL8139,
network_model.VIF_MODEL_E1000
],
}
if vif_model is None:
return True
if virt_type not in valid_models:
raise exception.UnsupportedVirtType(virt=virt_type)
return vif_model in valid_models[virt_type]
def is_vif_model_valid_for_virt(virt_type, vif_model):
if vif_model is None:
return True
if virt_type not in SUPPORTED_VIF_MODELS:
raise exception.UnsupportedVirtType(virt=virt_type)
return vif_model in SUPPORTED_VIF_MODELS[virt_type]
def is_disk_bus_valid_for_virt(virt_type, disk_bus):
valid_bus = {
'qemu': ['virtio', 'scsi', 'ide', 'usb'],
'kvm': ['virtio', 'scsi', 'ide', 'usb'],
'xen': ['xen', 'ide'],
'uml': ['uml'],
'lxc': ['lxc'],
}
if virt_type not in valid_bus:
raise exception.UnsupportedVirtType(virt=virt_type)
return disk_bus in valid_bus[virt_type]
def is_vif_model_valid_for_virt(virt_type, vif_model):
valid_models = {
'qemu': ['virtio', 'ne2k_pci', 'pcnet', 'rtl8139', 'e1000'],
'kvm': ['virtio', 'ne2k_pci', 'pcnet', 'rtl8139', 'e1000'],
'xen': ['netfront', 'ne2k_pci', 'pcnet', 'rtl8139', 'e1000'],
'lxc': [],
'uml': [],
}
if vif_model is None:
return True
if virt_type not in valid_models:
raise exception.UnsupportedVirtType(virt=virt_type)
return vif_model in valid_models[virt_type]
def is_disk_bus_valid_for_virt(virt_type, disk_bus):
# NOTE(aspiers): If you change this, don't forget to update the
# docs and metadata for hw_*_bus in glance.
valid_bus = {
'qemu': ['virtio', 'scsi', 'ide', 'usb', 'fdc', 'sata'],
'kvm': ['virtio', 'scsi', 'ide', 'usb', 'fdc', 'sata'],
'xen': ['xen', 'ide'],
'uml': ['uml'],
'lxc': ['lxc'],
'parallels': ['ide', 'scsi']
}
if virt_type not in valid_bus:
raise exception.UnsupportedVirtType(virt=virt_type)
return disk_bus in valid_bus[virt_type]
def _hard_reboot(*args, **kwargs):
raise exception.UnsupportedVirtType(virt="FakeVirt")
def get_disk_bus_for_device_type(instance,
virt_type,
image_meta,
device_type="disk"):
"""Determine the best disk bus to use for a device type.
Considering the currently configured virtualization type, return the
optimal disk_bus to use for a given device type. For example, for a disk
on KVM it will return 'virtio', while for a CDROM, it will return 'ide'
for the 'pc' machine type on x86_64, 'sata' for the 'q35' machine type on
x86_64 and 'scsi' on ppc64.
Returns the disk_bus, or returns None if the device type is not supported
for this virtualization
"""
# Prefer a disk bus set against the image first of all
if device_type == "disk":
disk_bus = osinfo.HardwareProperties(image_meta).disk_model
else:
key = "hw_" + device_type + "_bus"
disk_bus = image_meta.properties.get(key)
if disk_bus is not None:
if not is_disk_bus_valid_for_virt(virt_type, disk_bus):
raise exception.UnsupportedHardware(model=disk_bus,
virt=virt_type)
return disk_bus
# Otherwise pick a hypervisor default disk bus
if virt_type == "uml":
if device_type == "disk":
return "uml"
elif virt_type == "lxc":
return "lxc"
elif virt_type == "xen":
guest_vm_mode = obj_fields.VMMode.get_from_instance(instance)
if guest_vm_mode == obj_fields.VMMode.HVM:
return "ide"
else:
return "xen"
elif virt_type in ("qemu", "kvm"):
if device_type == "cdrom":
guestarch = libvirt_utils.get_arch(image_meta)
if guestarch in (
obj_fields.Architecture.PPC,
obj_fields.Architecture.PPC64,
obj_fields.Architecture.PPCLE,
obj_fields.Architecture.PPC64LE,
obj_fields.Architecture.S390,
obj_fields.Architecture.S390X,
obj_fields.Architecture.AARCH64):
return "scsi"
machine_type = libvirt_utils.get_machine_type(image_meta)
# NOTE(lyarwood): We can't be any more explicit here as QEMU
# provides a version of the Q35 machine type per release.
# Additionally downstream distributions can also provide their own.
if machine_type and 'q35' in machine_type:
# NOTE(lyarwood): The Q35 machine type does not provide an IDE
# bus and as such we must use a SATA bus for cdroms.
return "sata"
else:
return "ide"
elif device_type == "disk":
return "virtio"
elif device_type == "floppy":
return "fdc"
elif virt_type == "parallels":
if device_type == "cdrom":
return "ide"
elif device_type == "disk":
return "scsi"
else:
# If virt-type not in list then it is unsupported
raise exception.UnsupportedVirtType(virt=virt_type)
return None
def is_disk_bus_valid_for_virt(virt_type, disk_bus):
if virt_type not in SUPPORTED_DEVICE_BUSES:
raise exception.UnsupportedVirtType(virt=virt_type)
return disk_bus in SUPPORTED_DEVICE_BUSES[virt_type]