def _bind_device_to_vfio(pci_address, driver):
if _using_virtio(pci_address):
_enable_unsafe_vfio_noiommu_mode()
else:
rc, _, _, = exec_cmd(['modinfo', 'vfio-pci'])
if rc:
rc, _, err = exec_cmd(['modprobe', 'vfio-pci'])
if rc:
raise Exception(
'Could not load vfio-pci module: {}'.format(err))
_bind_device_to_driver(pci_address, driver)
def _enable_unsafe_vfio_noiommu_mode():
_remove_vfio_pci()
_remove_vfio()
rc, _, err = exec_cmd(['modprobe', 'vfio', 'enable_unsafe_noiommu_mode=1'])
if rc:
raise Exception('Could not set unsafe noiommu mode: {}'.format(err))
def _remove_module(module):
rc, _, err = exec_cmd(['modprobe', '-r', module])
if rc:
if 'No such file' in err:
return
else:
raise Exception('Could not remove {} module: {}'.format(
module, err))
def _get_kernel_args():
rc, out, err = exec_cmd(['grubby', '--info', _get_default_kernel()])
if rc != 0:
raise ReadKernelArgsError(err)
return [
l.split('=', 1)[1].strip('"') for l in out.split('\n')
if l.startswith('args')
][0]
def _add_iommu():
if _is_iommu_set():
return False
rc, _, err = exec_cmd([
'grubby', '--args=iommu=pt intel_iommu=on',
'--update-kernel={}'.format(_get_default_kernel())
])
if rc != 0:
raise UpdateKernelError(err)
return True
def _remove_override(pci_address):
rc, _, err = exec_cmd(['driverctl', 'unset-override', pci_address])
if rc:
raise Exception(
'Could not remove driver override of device {}: {}'.format(
pci_address, err))
def _bind_device_to_driver(pci_address, driver):
rc, _, err = exec_cmd(['driverctl', 'set-override', pci_address, driver])
if rc:
raise Exception('Could not bind device {} to {}: {}'.format(
pci_address, driver, err))
def _select_cpu_partitioning(cpu_list):
profile = 'cpu-partitioning' if cpu_list else 'balanced'
rc, _, err = exec_cmd(['tuned-adm', 'profile', profile])
if rc != 0:
raise SelectCpuPartitioningError(err)