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On QEMU 7.2.0+, if "passt" is available, ask QEMU for passt ("stream")
rather than SLIRP ("user") networking.
For this, we need to run passt ourselves. Given that passt daemonizes by
default, start it with our traditional function guestfs_int_cmd_run(). Ask
passt to save its PID file, because in case something goes wrong before
we're completely sure the appliance (i.e. QEMU) is up and running, we'll
need to kill passt, the *grandchild*, ourselves.
Pass "--one-off" to passt (same as libvirt). This way, once we have proof
that QEMU has connected to passt (because the appliance shows signs of
life), we need not clean up passt ourselves -- once QEMU exits, passt will
see an EOF on the unix domain socket, and exit as well.
Passt is way more flexible than SLIRP, and passt normally intends to
imitate the host environment in the guest as much as possible. This means
that, when switching from SLIRP to passt, the guest would see changes to
the following:
- guest IP address,
- guest subnet mask,
- host (= gateway) IP address,
- host (= gateway) MAC address.
Extract the SLIRP defaults into the new macros NETWORK_GW_IP and
NETWORK_GW_MAC, and pass them explicitly to passt. In particular,
"tests/rsync/test-rsync.sh" fails without setting the host address
(NETWORK_GW_IP) properly.
(These artifacts can be verified in the appliance with "virt-rescue
--network", by running "ip addr", "ip route", and "ip neighbor" at the
virt-rescue prompt. There are four scenarios: two libguest backends, times
passt being installed or not installed.)
Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2184967
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Message-Id: <20230714132213.96616-8-lersek@redhat.com>
Reviewed-by: Richard W.M. Jones <rjones@redhat.com>
Libguestfs is tools and a library for accessing and modifying guest disk images. For more information see the home page: http://libguestfs.org/ For discussion, development, patches, etc. please use the mailing list: http://www.redhat.com/mailman/listinfo/libguestfs To find out how to build libguestfs from source, read: docs/guestfs-building.pod http://libguestfs.org/guestfs-building.1.html man docs/guestfs-building.1 Copyright (C) 2009-2023 Red Hat Inc. The library is distributed under the LGPLv2+. The programs are distributed under the GPLv2+. Please see the files COPYING and COPYING.LIB for full license information. The examples are under a very liberal license.