net: Add passt network backend

This commit introduces support for passt as a new network backend.
passt is an unprivileged, user-mode networking solution that provides
connectivity for virtual machines by launching an external helper process.

The implementation reuses the generic stream data handling logic. It
launches the passt binary using GSubprocess, passing it a file
descriptor from a socketpair() for communication. QEMU connects to
the other end of the socket pair to establish the network data stream.

The PID of the passt daemon is tracked via a temporary file to
ensure it is terminated when QEMU exits.

Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/scripts/meson-buildoptions.sh b/scripts/meson-buildoptions.sh
index 73e0770f42..bb3e34d852 100644
--- a/scripts/meson-buildoptions.sh
+++ b/scripts/meson-buildoptions.sh
@@ -162,6 +162,7 @@ meson_options_help() {
   printf "%s\n" '  oss             OSS sound support'
   printf "%s\n" '  pa              PulseAudio sound support'
   printf "%s\n" '  parallels       parallels image format support'
+  printf "%s\n" '  passt           passt network backend support'
   printf "%s\n" '  pipewire        PipeWire sound support'
   printf "%s\n" '  pixman          pixman support'
   printf "%s\n" '  plugins         TCG plugins via shared library loading'
@@ -422,6 +423,8 @@ _meson_option_parse() {
     --disable-pa) printf "%s" -Dpa=disabled ;;
     --enable-parallels) printf "%s" -Dparallels=enabled ;;
     --disable-parallels) printf "%s" -Dparallels=disabled ;;
+    --enable-passt) printf "%s" -Dpasst=enabled ;;
+    --disable-passt) printf "%s" -Dpasst=disabled ;;
     --enable-pipewire) printf "%s" -Dpipewire=enabled ;;
     --disable-pipewire) printf "%s" -Dpipewire=disabled ;;
     --enable-pixman) printf "%s" -Dpixman=enabled ;;