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#
# Copyright (c) 2022 Nutanix Inc. All rights reserved.
#
# Authors: Thanos Makatos <thanos.makatos@nutanix.com>
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
# * Neither the name of Nutanix nor the names of its contributors may be
# used to endorse or promote products derived from this software without
# specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
# DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
# DAMAGE.
#
from libvfio_user import *
import tempfile
import mmap
import errno
def test_shadow_ioeventfd():
"""Configure a shadow ioeventfd, have the client trigger it, confirm that
the server receives the notification and can see the value."""
# server setup
ctx = vfu_create_ctx(flags=LIBVFIO_USER_FLAG_ATTACH_NB)
assert ctx is not None
ret = vfu_setup_region(ctx, index=VFU_PCI_DEV_BAR0_REGION_IDX, size=0x1000,
flags=VFU_REGION_FLAG_RW)
assert ret == 0
fo = tempfile.TemporaryFile(dir="/dev/shm")
fo.truncate(0x1000)
# FIXME
# Use pip install eventfd?
# $ grep EFD_NONBLOCK -wr /usr/include/
# /usr/include/bits/eventfd.h: EFD_NONBLOCK = 00004000
EFD_NONBLOCK = 0o00004000
efd = eventfd(flags=EFD_NONBLOCK)
ret = vfu_create_ioeventfd(ctx, VFU_PCI_DEV_BAR0_REGION_IDX, efd, 0x8,
0x16, 0, 0, fo.fileno(), 0x10)
assert ret == 0
ret = vfu_realize_ctx(ctx)
assert ret == 0
# client queries I/O region FDs
sock = connect_client(ctx)
payload = vfio_user_region_io_fds_request(
argsz=len(vfio_user_region_io_fds_reply()) +
len(vfio_user_sub_region_ioeventfd()), flags=0,
index=VFU_PCI_DEV_BAR0_REGION_IDX, count=0)
newfds, ret = msg_fds(ctx, sock, VFIO_USER_DEVICE_GET_REGION_IO_FDS,
payload, expect=0)
reply, ret = vfio_user_region_io_fds_reply.pop_from_buffer(ret)
assert reply.count == 1 # 1 eventfd
ioevent, _ = vfio_user_sub_region_ioeventfd.pop_from_buffer(ret)
assert ioevent.gpa_offset == 0x8
assert ioevent.size == 0x16
assert ioevent.fd_index == 0
assert ioevent.type == VFIO_USER_IO_FD_TYPE_IOEVENTFD_SHADOW
assert ioevent.flags == 0
assert ioevent.datamatch == 0
assert ioevent.shadow_offset == 0x10
assert len(newfds) == 2 # 2 FDs: eventfd plus shadow FD
cefd = newfds[0]
csfd = newfds[1]
cmem = mmap.mmap(csfd, 0x1000)
# vfio-user app reads the eventfd, there should be nothing there
try:
os.read(efd, IOEVENT_SIZE)
except BlockingIOError as e:
if e.errno != errno.EAGAIN:
assert False
else:
assert False
# Client writes to the I/O region. The write to the eventfd would be done
# by KVM and the value would be the same in both cases.
cmem.seek(ioevent.shadow_offset)
cmem.write(c.c_ulonglong(0xdeadbeef))
os.write(cefd, c.c_ulonglong(0xcafebabe))
# vfio-user app reads eventfd
assert os.read(efd, IOEVENT_SIZE) == to_bytes_le(0xcafebabe, 8)
fo.seek(ioevent.shadow_offset)
assert fo.read(0x8) == to_bytes_le(0xdeadbeef, 8)
vfu_destroy_ctx(ctx)
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