test/py/test_device_get_region_info_zero_size.py

#
# Copyright (c) 2021 Nutanix Inc. All rights reserved.
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# Author: Thanos Makatos <thanos.makatos@nutanix.com>
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from libvfio_user import *

ctx = None
client = None

argsz = len(vfio_region_info())


def test_device_get_region_info_setup():
    global ctx, client

    ctx = vfu_create_ctx(flags=LIBVFIO_USER_FLAG_ATTACH_NB)
    assert ctx is not None

    ret = vfu_realize_ctx(ctx)
    assert ret == 0

    client = connect_client(ctx)


def test_device_get_region_info_zero_sized_region():
    """Tests that a zero-sized region has no caps."""

    global client

    payload = vfio_region_info(argsz=argsz, flags=0,
                               index=VFU_PCI_DEV_BAR1_REGION_IDX, cap_offset=0,
                               size=0, offset=0)

    hdr = vfio_user_header(VFIO_USER_DEVICE_GET_REGION_INFO,
                            size=len(payload))
    client.sock.send(hdr + payload)
    vfu_run_ctx(ctx)
    result = get_reply(client.sock)

    assert len(result) == argsz

    info, _ = vfio_region_info.pop_from_buffer(result)

    assert info.argsz == argsz
    assert info.flags == 0
    assert info.index == VFU_PCI_DEV_BAR1_REGION_IDX
    assert info.cap_offset == 0
    assert info.size == 0
    assert info.offset == 0

    vfu_destroy_ctx(ctx)

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