test/py/test_dma_unmap.py

#
# Copyright (c) 2021 Nutanix Inc. All rights reserved.
#
# Authors: John Levon <john.levon@nutanix.com>
#          Swapnil Ingle <swapnil.ingle@nutanix.com>
#
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import errno
from unittest.mock import patch
from libvfio_user import *

ctx = None
client = None


def setup_function(function):
    global ctx, client
    ctx = prepare_ctx_for_dma()
    assert ctx is not None

    ret = vfu_realize_ctx(ctx)
    assert ret == 0

    client = connect_client(ctx)


def teardown_function(function):
    global ctx, client
    client.disconnect(ctx)
    vfu_destroy_ctx(ctx)


def setup_dma_regions(dma_regions=[(0x0, PAGE_SIZE)]):
    global ctx, client
    for dma_region in dma_regions:
        payload = struct.pack("II", 0, 0)
        payload = vfio_user_dma_map(argsz=len(vfio_user_dma_map()),
            flags=(VFIO_USER_F_DMA_REGION_READ |
                   VFIO_USER_F_DMA_REGION_WRITE),
            offset=0, addr=dma_region[0], size=dma_region[1])
        msg(ctx, client.sock, VFIO_USER_DMA_MAP, payload)


def test_dma_unmap_short_write():
    payload = struct.pack("II", 0, 0)
    msg(ctx, client.sock, VFIO_USER_DMA_UNMAP, payload,
        expect=errno.EINVAL)


def test_dma_unmap_bad_argsz():

    payload = vfio_user_dma_unmap(argsz=8, flags=0, addr=PAGE_SIZE,
                                  size=PAGE_SIZE)
    msg(ctx, client.sock, VFIO_USER_DMA_UNMAP, payload,
        expect=errno.EINVAL)


def test_dma_unmap_bad_argsz2():

    payload = vfio_user_dma_unmap(argsz=SERVER_MAX_DATA_XFER_SIZE + 8, flags=0,
                                  addr=PAGE_SIZE, size=PAGE_SIZE)
    msg(ctx, client.sock, VFIO_USER_DMA_UNMAP, payload,
        expect=errno.EINVAL)


def test_dma_unmap_dirty_bad_argsz():

    argsz = len(vfio_user_dma_unmap()) + len(vfio_user_bitmap())
    unmap = vfio_user_dma_unmap(argsz=argsz,
        flags=VFIO_DMA_UNMAP_FLAG_GET_DIRTY_BITMAP, addr=PAGE_SIZE,
        size=PAGE_SIZE)
    bitmap = vfio_user_bitmap(pgsize=PAGE_SIZE, size=(UINT64_MAX - argsz) + 8)
    payload = bytes(unmap) + bytes(bitmap)

    msg(ctx, client.sock, VFIO_USER_DMA_UNMAP, payload,
        expect=errno.EINVAL)


def test_dma_unmap_dirty_not_tracking():

    setup_dma_regions([(PAGE_SIZE, PAGE_SIZE)])
    argsz = len(vfio_user_dma_unmap()) + len(vfio_user_bitmap()) + 8
    unmap = vfio_user_dma_unmap(argsz=argsz,
        flags=VFIO_DMA_UNMAP_FLAG_GET_DIRTY_BITMAP, addr=PAGE_SIZE,
        size=PAGE_SIZE)
    bitmap = vfio_user_bitmap(pgsize=PAGE_SIZE, size=8)
    payload = bytes(unmap) + bytes(bitmap) + bytes(8)

    msg(ctx, client.sock, VFIO_USER_DMA_UNMAP, payload,
        expect=errno.EINVAL)


def test_dma_unmap_invalid_flags():

    setup_dma_regions()
    payload = vfio_user_dma_unmap(argsz=len(vfio_user_dma_unmap()),
                                  flags=0x4, addr=PAGE_SIZE, size=PAGE_SIZE)
    msg(ctx, client.sock, VFIO_USER_DMA_UNMAP, payload,
        expect=errno.EINVAL)


def test_dma_unmap():

    setup_dma_regions()
    payload = vfio_user_dma_unmap(argsz=len(vfio_user_dma_unmap()),
                                  flags=0, addr=0x0, size=PAGE_SIZE)
    msg(ctx, client.sock, VFIO_USER_DMA_UNMAP, payload)


def test_dma_unmap_invalid_addr():

    setup_dma_regions()
    payload = vfio_user_dma_unmap(argsz=len(vfio_user_dma_unmap()),
                                  addr=0x10 << PAGE_SHIFT, size=PAGE_SIZE)

    msg(ctx, client.sock, VFIO_USER_DMA_UNMAP, payload,
        expect=errno.ENOENT)


@patch('libvfio_user.quiesce_cb')
def test_dma_unmap_async(mock_quiesce):

    setup_dma_regions()
    mock_quiesce.side_effect = fail_with_errno(errno.EBUSY)
    payload = vfio_user_dma_unmap(argsz=len(vfio_user_dma_unmap()),
                                  flags=0, addr=0x0, size=PAGE_SIZE)
    msg(ctx, client.sock, VFIO_USER_DMA_UNMAP, payload, rsp=False,
        busy=True)

    ret = vfu_device_quiesced(ctx, 0)
    assert ret == 0

    get_reply(client.sock)

    ret = vfu_run_ctx(ctx)
    assert ret == 0


def test_dma_unmap_all():

    dma_regions = [(PAGE_SIZE * i, PAGE_SIZE) for i in range(MAX_DMA_REGIONS)]
    setup_dma_regions(dma_regions)
    payload = vfio_user_dma_unmap(argsz=len(vfio_user_dma_unmap()),
        flags=VFIO_DMA_UNMAP_FLAG_ALL, addr=0, size=0)
    msg(ctx, client.sock, VFIO_USER_DMA_UNMAP, payload)


def test_dma_unmap_all_invalid_addr():

    payload = vfio_user_dma_unmap(argsz=len(vfio_user_dma_unmap()),
        flags=VFIO_DMA_UNMAP_FLAG_ALL, addr=0x10 << PAGE_SHIFT, size=PAGE_SIZE)

    msg(ctx, client.sock, VFIO_USER_DMA_UNMAP, payload,
        expect=errno.EINVAL)


def test_dma_unmap_all_invalid_flags():

    payload = vfio_user_dma_unmap(argsz=len(vfio_user_dma_unmap()),
        flags=(VFIO_DMA_UNMAP_FLAG_ALL | VFIO_DMA_UNMAP_FLAG_GET_DIRTY_BITMAP),
               addr=0, size=0)

    msg(ctx, client.sock, VFIO_USER_DMA_UNMAP, payload,
        expect=errno.EINVAL)

# FIXME need to add unit tests that test errors in get_request_header,
# do_reply, vfu_dma_transfer

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