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qemu-e2k/scripts/meson-buildoptions.sh
Ilya Maximets cb039ef3d9 net: add initial support for AF_XDP network backend 
AF_XDP is a network socket family that allows communication directly
with the network device driver in the kernel, bypassing most or all
of the kernel networking stack.  In the essence, the technology is
pretty similar to netmap.  But, unlike netmap, AF_XDP is Linux-native
and works with any network interfaces without driver modifications.
Unlike vhost-based backends (kernel, user, vdpa), AF_XDP doesn't
require access to character devices or unix sockets.  Only access to
the network interface itself is necessary.

This patch implements a network backend that communicates with the
kernel by creating an AF_XDP socket.  A chunk of userspace memory
is shared between QEMU and the host kernel.  4 ring buffers (Tx, Rx,
Fill and Completion) are placed in that memory along with a pool of
memory buffers for the packet data.  Data transmission is done by
allocating one of the buffers, copying packet data into it and
placing the pointer into Tx ring.  After transmission, device will
return the buffer via Completion ring.  On Rx, device will take
a buffer form a pre-populated Fill ring, write the packet data into
it and place the buffer into Rx ring.

AF_XDP network backend takes on the communication with the host
kernel and the network interface and forwards packets to/from the
peer device in QEMU.

Usage example:

  -device virtio-net-pci,netdev=guest1,mac=00:16:35:AF:AA:5C
  -netdev af-xdp,ifname=ens6f1np1,id=guest1,mode=native,queues=1

XDP program bridges the socket with a network interface.  It can be
attached to the interface in 2 different modes:

1. skb - this mode should work for any interface and doesn't require
         driver support.  With a caveat of lower performance.

2. native - this does require support from the driver and allows to
            bypass skb allocation in the kernel and potentially use
            zero-copy while getting packets in/out userspace.

By default, QEMU will try to use native mode and fall back to skb.
Mode can be forced via 'mode' option.  To force 'copy' even in native
mode, use 'force-copy=on' option.  This might be useful if there is
some issue with the driver.

Option 'queues=N' allows to specify how many device queues should
be open.  Note that all the queues that are not open are still
functional and can receive traffic, but it will not be delivered to
QEMU.  So, the number of device queues should generally match the
QEMU configuration, unless the device is shared with something
else and the traffic re-direction to appropriate queues is correctly
configured on a device level (e.g. with ethtool -N).
'start-queue=M' option can be used to specify from which queue id
QEMU should start configuring 'N' queues.  It might also be necessary
to use this option with certain NICs, e.g. MLX5 NICs.  See the docs
for examples.

In a general case QEMU will need CAP_NET_ADMIN and CAP_SYS_ADMIN
or CAP_BPF capabilities in order to load default XSK/XDP programs to
the network interface and configure BPF maps.  It is possible, however,
to run with no capabilities.  For that to work, an external process
with enough capabilities will need to pre-load default XSK program,
create AF_XDP sockets and pass their file descriptors to QEMU process
on startup via 'sock-fds' option.  Network backend will need to be
configured with 'inhibit=on' to avoid loading of the program.
QEMU will need 32 MB of locked memory (RLIMIT_MEMLOCK) per queue
or CAP_IPC_LOCK.

There are few performance challenges with the current network backends.

First is that they do not support IO threads.  This means that data
path is handled by the main thread in QEMU and may slow down other
work or may be slowed down by some other work.  This also means that
taking advantage of multi-queue is generally not possible today.

Another thing is that data path is going through the device emulation
code, which is not really optimized for performance.  The fastest
"frontend" device is virtio-net.  But it's not optimized for heavy
traffic either, because it expects such use-cases to be handled via
some implementation of vhost (user, kernel, vdpa).  In practice, we
have virtio notifications and rcu lock/unlock on a per-packet basis
and not very efficient accesses to the guest memory.  Communication
channels between backend and frontend devices do not allow passing
more than one packet at a time as well.

Some of these challenges can be avoided in the future by adding better
batching into device emulation or by implementing vhost-af-xdp variant.

There are also a few kernel limitations.  AF_XDP sockets do not
support any kinds of checksum or segmentation offloading.  Buffers
are limited to a page size (4K), i.e. MTU is limited.  Multi-buffer
support implementation for AF_XDP is in progress, but not ready yet.
Also, transmission in all non-zero-copy modes is synchronous, i.e.
done in a syscall.  That doesn't allow high packet rates on virtual
interfaces.

However, keeping in mind all of these challenges, current implementation
of the AF_XDP backend shows a decent performance while running on top
of a physical NIC with zero-copy support.

Test setup:

2 VMs running on 2 physical hosts connected via ConnectX6-Dx card.
Network backend is configured to open the NIC directly in native mode.
The driver supports zero-copy.  NIC is configured to use 1 queue.

Inside a VM - iperf3 for basic TCP performance testing and dpdk-testpmd
for PPS testing.

iperf3 result:
 TCP stream      : 19.1 Gbps

dpdk-testpmd (single queue, single CPU core, 64 B packets) results:
 Tx only         : 3.4 Mpps
 Rx only         : 2.0 Mpps
 L2 FWD Loopback : 1.5 Mpps

In skb mode the same setup shows much lower performance, similar to
the setup where pair of physical NICs is replaced with veth pair:

iperf3 result:
  TCP stream      : 9 Gbps

dpdk-testpmd (single queue, single CPU core, 64 B packets) results:
  Tx only         : 1.2 Mpps
  Rx only         : 1.0 Mpps
  L2 FWD Loopback : 0.7 Mpps

Results in skb mode or over the veth are close to results of a tap
backend with vhost=on and disabled segmentation offloading bridged
with a NIC.

Signed-off-by: Ilya Maximets <i.maximets@ovn.org>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com> (docker/lcitool)
Signed-off-by: Jason Wang <jasowang@redhat.com>
2023-09-18 14:36:13 +08:00

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# This file is generated by meson-buildoptions.py, do not edit!
meson_options_help() {
printf "%s\n" ' --audio-drv-list=CHOICES Set audio driver list [default] (choices: alsa/co'
printf "%s\n" ' reaudio/default/dsound/jack/oss/pa/pipewire/sdl/s'
printf "%s\n" ' ndio)'
printf "%s\n" ' --block-drv-ro-whitelist=VALUE'
printf "%s\n" ' set block driver read-only whitelist (by default'
printf "%s\n" ' affects only QEMU, not tools like qemu-img)'
printf "%s\n" ' --block-drv-rw-whitelist=VALUE'
printf "%s\n" ' set block driver read-write whitelist (by default'
printf "%s\n" ' affects only QEMU, not tools like qemu-img)'
printf "%s\n" ' --datadir=VALUE Data file directory [share]'
printf "%s\n" ' --disable-coroutine-pool coroutine freelist (better performance)'
printf "%s\n" ' --disable-debug-info Enable debug symbols and other information'
printf "%s\n" ' --disable-hexagon-idef-parser'
printf "%s\n" ' use idef-parser to automatically generate TCG'
printf "%s\n" ' code for the Hexagon frontend'
printf "%s\n" ' --disable-install-blobs install provided firmware blobs'
printf "%s\n" ' --disable-qom-cast-debug cast debugging support'
printf "%s\n" ' --docdir=VALUE Base directory for documentation installation'
printf "%s\n" ' (can be empty) [share/doc]'
printf "%s\n" ' --enable-block-drv-whitelist-in-tools'
printf "%s\n" ' use block whitelist also in tools instead of only'
printf "%s\n" ' QEMU'
printf "%s\n" ' --enable-cfi Control-Flow Integrity (CFI)'
printf "%s\n" ' --enable-cfi-debug Verbose errors in case of CFI violation'
printf "%s\n" ' --enable-debug-graph-lock'
printf "%s\n" ' graph lock debugging support'
printf "%s\n" ' --enable-debug-mutex mutex debugging support'
printf "%s\n" ' --enable-debug-stack-usage'
printf "%s\n" ' measure coroutine stack usage'
printf "%s\n" ' --enable-debug-tcg TCG debugging'
printf "%s\n" ' --enable-fdt[=CHOICE] Whether and how to find the libfdt library'
printf "%s\n" ' (choices: auto/disabled/enabled/internal/system)'
printf "%s\n" ' --enable-fuzzing build fuzzing targets'
printf "%s\n" ' --enable-gcov Enable coverage tracking.'
printf "%s\n" ' --enable-gprof QEMU profiling with gprof'
printf "%s\n" ' --enable-lto Use link time optimization'
printf "%s\n" ' --enable-malloc=CHOICE choose memory allocator to use [system] (choices:'
printf "%s\n" ' jemalloc/system/tcmalloc)'
printf "%s\n" ' --enable-module-upgrades try to load modules from alternate paths for'
printf "%s\n" ' upgrades'
printf "%s\n" ' --enable-plugins TCG plugins via shared library loading'
printf "%s\n" ' --enable-rng-none dummy RNG, avoid using /dev/(u)random and'
printf "%s\n" ' getrandom()'
printf "%s\n" ' --enable-safe-stack SafeStack Stack Smash Protection (requires'
printf "%s\n" ' clang/llvm and coroutine backend ucontext)'
printf "%s\n" ' --enable-sanitizers enable default sanitizers'
printf "%s\n" ' --enable-strip Strip targets on install'
printf "%s\n" ' --enable-tcg-interpreter TCG with bytecode interpreter (slow)'
printf "%s\n" ' --enable-trace-backends=CHOICES'
printf "%s\n" ' Set available tracing backends [log] (choices:'
printf "%s\n" ' dtrace/ftrace/log/nop/simple/syslog/ust)'
printf "%s\n" ' --enable-tsan enable thread sanitizer'
printf "%s\n" ' --firmwarepath=VALUES search PATH for firmware files [share/qemu-'
printf "%s\n" ' firmware]'
printf "%s\n" ' --iasl=VALUE Path to ACPI disassembler'
printf "%s\n" ' --includedir=VALUE Header file directory [include]'
printf "%s\n" ' --interp-prefix=VALUE where to find shared libraries etc., use %M for'
printf "%s\n" ' cpu name [/usr/gnemul/qemu-%M]'
printf "%s\n" ' --libdir=VALUE Library directory [system default]'
printf "%s\n" ' --libexecdir=VALUE Library executable directory [libexec]'
printf "%s\n" ' --localedir=VALUE Locale data directory [share/locale]'
printf "%s\n" ' --localstatedir=VALUE Localstate data directory [/var/local]'
printf "%s\n" ' --mandir=VALUE Manual page directory [share/man]'
printf "%s\n" ' --sysconfdir=VALUE Sysconf data directory [etc]'
printf "%s\n" ' --tls-priority=VALUE Default TLS protocol/cipher priority string'
printf "%s\n" ' [NORMAL]'
printf "%s\n" ' --with-coroutine=CHOICE coroutine backend to use (choices:'
printf "%s\n" ' auto/sigaltstack/ucontext/windows)'
printf "%s\n" ' --with-pkgversion=VALUE use specified string as sub-version of the'
printf "%s\n" ' package'
printf "%s\n" ' --with-trace-file=VALUE Trace file prefix for simple backend [trace]'
printf "%s\n" ''
printf "%s\n" 'Optional features, enabled with --enable-FEATURE and'
printf "%s\n" 'disabled with --disable-FEATURE, default is enabled if available'
printf "%s\n" '(unless built with --without-default-features):'
printf "%s\n" ''
printf "%s\n" ' af-xdp AF_XDP network backend support'
printf "%s\n" ' alsa ALSA sound support'
printf "%s\n" ' attr attr/xattr support'
printf "%s\n" ' auth-pam PAM access control'
printf "%s\n" ' avx2 AVX2 optimizations'
printf "%s\n" ' avx512bw AVX512BW optimizations'
printf "%s\n" ' avx512f AVX512F optimizations'
printf "%s\n" ' blkio libblkio block device driver'
printf "%s\n" ' bochs bochs image format support'
printf "%s\n" ' bpf eBPF support'
printf "%s\n" ' brlapi brlapi character device driver'
printf "%s\n" ' bzip2 bzip2 support for DMG images'
printf "%s\n" ' canokey CanoKey support'
printf "%s\n" ' cap-ng cap_ng support'
printf "%s\n" ' capstone Whether and how to find the capstone library'
printf "%s\n" ' cloop cloop image format support'
printf "%s\n" ' cocoa Cocoa user interface (macOS only)'
printf "%s\n" ' colo-proxy colo-proxy support'
printf "%s\n" ' coreaudio CoreAudio sound support'
printf "%s\n" ' crypto-afalg Linux AF_ALG crypto backend driver'
printf "%s\n" ' curl CURL block device driver'
printf "%s\n" ' curses curses UI'
printf "%s\n" ' dbus-display -display dbus support'
printf "%s\n" ' dmg dmg image format support'
printf "%s\n" ' docs Documentations build support'
printf "%s\n" ' dsound DirectSound sound support'
printf "%s\n" ' fuse FUSE block device export'
printf "%s\n" ' fuse-lseek SEEK_HOLE/SEEK_DATA support for FUSE exports'
printf "%s\n" ' gcrypt libgcrypt cryptography support'
printf "%s\n" ' gettext Localization of the GTK+ user interface'
printf "%s\n" ' gio use libgio for D-Bus support'
printf "%s\n" ' glusterfs Glusterfs block device driver'
printf "%s\n" ' gnutls GNUTLS cryptography support'
printf "%s\n" ' gtk GTK+ user interface'
printf "%s\n" ' gtk-clipboard clipboard support for the gtk UI (EXPERIMENTAL, MAY HANG)'
printf "%s\n" ' guest-agent Build QEMU Guest Agent'
printf "%s\n" ' guest-agent-msi Build MSI package for the QEMU Guest Agent'
printf "%s\n" ' hvf HVF acceleration support'
printf "%s\n" ' iconv Font glyph conversion support'
printf "%s\n" ' jack JACK sound support'
printf "%s\n" ' keyring Linux keyring support'
printf "%s\n" ' kvm KVM acceleration support'
printf "%s\n" ' l2tpv3 l2tpv3 network backend support'
printf "%s\n" ' libdaxctl libdaxctl support'
printf "%s\n" ' libdw debuginfo support'
printf "%s\n" ' libiscsi libiscsi userspace initiator'
printf "%s\n" ' libnfs libnfs block device driver'
printf "%s\n" ' libpmem libpmem support'
printf "%s\n" ' libssh ssh block device support'
printf "%s\n" ' libudev Use libudev to enumerate host devices'
printf "%s\n" ' libusb libusb support for USB passthrough'
printf "%s\n" ' libvduse build VDUSE Library'
printf "%s\n" ' linux-aio Linux AIO support'
printf "%s\n" ' linux-io-uring Linux io_uring support'
printf "%s\n" ' live-block-migration'
printf "%s\n" ' block migration in the main migration stream'
printf "%s\n" ' lzfse lzfse support for DMG images'
printf "%s\n" ' lzo lzo compression support'
printf "%s\n" ' malloc-trim enable libc malloc_trim() for memory optimization'
printf "%s\n" ' membarrier membarrier system call (for Linux 4.14+ or Windows'
printf "%s\n" ' modules modules support (non Windows)'
printf "%s\n" ' mpath Multipath persistent reservation passthrough'
printf "%s\n" ' multiprocess Out of process device emulation support'
printf "%s\n" ' netmap netmap network backend support'
printf "%s\n" ' nettle nettle cryptography support'
printf "%s\n" ' numa libnuma support'
printf "%s\n" ' nvmm NVMM acceleration support'
printf "%s\n" ' opengl OpenGL support'
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" ' pipewire PipeWire sound support'
printf "%s\n" ' png PNG support with libpng'
printf "%s\n" ' pvrdma Enable PVRDMA support'
printf "%s\n" ' qcow1 qcow1 image format support'
printf "%s\n" ' qed qed image format support'
printf "%s\n" ' qga-vss build QGA VSS support (broken with MinGW)'
printf "%s\n" ' rbd Ceph block device driver'
printf "%s\n" ' rdma Enable RDMA-based migration'
printf "%s\n" ' replication replication support'
printf "%s\n" ' sdl SDL user interface'
printf "%s\n" ' sdl-image SDL Image support for icons'
printf "%s\n" ' seccomp seccomp support'
printf "%s\n" ' selinux SELinux support in qemu-nbd'
printf "%s\n" ' slirp libslirp user mode network backend support'
printf "%s\n" ' slirp-smbd use smbd (at path --smbd=*) in slirp networking'
printf "%s\n" ' smartcard CA smartcard emulation support'
printf "%s\n" ' snappy snappy compression support'
printf "%s\n" ' sndio sndio sound support'
printf "%s\n" ' sparse sparse checker'
printf "%s\n" ' spice Spice server support'
printf "%s\n" ' spice-protocol Spice protocol support'
printf "%s\n" ' stack-protector compiler-provided stack protection'
printf "%s\n" ' tcg TCG support'
printf "%s\n" ' tools build support utilities that come with QEMU'
printf "%s\n" ' tpm TPM support'
printf "%s\n" ' u2f U2F emulation support'
printf "%s\n" ' usb-redir libusbredir support'
printf "%s\n" ' vde vde network backend support'
printf "%s\n" ' vdi vdi image format support'
printf "%s\n" ' vduse-blk-export'
printf "%s\n" ' VDUSE block export support'
printf "%s\n" ' vfio-user-server'
printf "%s\n" ' vfio-user server support'
printf "%s\n" ' vhdx vhdx image format support'
printf "%s\n" ' vhost-crypto vhost-user crypto backend support'
printf "%s\n" ' vhost-kernel vhost kernel backend support'
printf "%s\n" ' vhost-net vhost-net kernel acceleration support'
printf "%s\n" ' vhost-user vhost-user backend support'
printf "%s\n" ' vhost-user-blk-server'
printf "%s\n" ' build vhost-user-blk server'
printf "%s\n" ' vhost-vdpa vhost-vdpa kernel backend support'
printf "%s\n" ' virglrenderer virgl rendering support'
printf "%s\n" ' virtfs virtio-9p support'
printf "%s\n" ' virtfs-proxy-helper'
printf "%s\n" ' virtio-9p proxy helper support'
printf "%s\n" ' vmdk vmdk image format support'
printf "%s\n" ' vmnet vmnet.framework network backend support'
printf "%s\n" ' vnc VNC server'
printf "%s\n" ' vnc-jpeg JPEG lossy compression for VNC server'
printf "%s\n" ' vnc-sasl SASL authentication for VNC server'
printf "%s\n" ' vpc vpc image format support'
printf "%s\n" ' vte vte support for the gtk UI'
printf "%s\n" ' vvfat vvfat image format support'
printf "%s\n" ' whpx WHPX acceleration support'
printf "%s\n" ' xen Xen backend support'
printf "%s\n" ' xen-pci-passthrough'
printf "%s\n" ' Xen PCI passthrough support'
printf "%s\n" ' xkbcommon xkbcommon support'
printf "%s\n" ' zstd zstd compression support'
}
_meson_option_parse() {
case $1 in
--enable-af-xdp) printf "%s" -Daf_xdp=enabled ;;
--disable-af-xdp) printf "%s" -Daf_xdp=disabled ;;
--enable-alsa) printf "%s" -Dalsa=enabled ;;
--disable-alsa) printf "%s" -Dalsa=disabled ;;
--enable-attr) printf "%s" -Dattr=enabled ;;
--disable-attr) printf "%s" -Dattr=disabled ;;
--audio-drv-list=*) quote_sh "-Daudio_drv_list=$2" ;;
--enable-auth-pam) printf "%s" -Dauth_pam=enabled ;;
--disable-auth-pam) printf "%s" -Dauth_pam=disabled ;;
--enable-avx2) printf "%s" -Davx2=enabled ;;
--disable-avx2) printf "%s" -Davx2=disabled ;;
--enable-avx512bw) printf "%s" -Davx512bw=enabled ;;
--disable-avx512bw) printf "%s" -Davx512bw=disabled ;;
--enable-avx512f) printf "%s" -Davx512f=enabled ;;
--disable-avx512f) printf "%s" -Davx512f=disabled ;;
--enable-gcov) printf "%s" -Db_coverage=true ;;
--disable-gcov) printf "%s" -Db_coverage=false ;;
--enable-lto) printf "%s" -Db_lto=true ;;
--disable-lto) printf "%s" -Db_lto=false ;;
--enable-blkio) printf "%s" -Dblkio=enabled ;;
--disable-blkio) printf "%s" -Dblkio=disabled ;;
--block-drv-ro-whitelist=*) quote_sh "-Dblock_drv_ro_whitelist=$2" ;;
--block-drv-rw-whitelist=*) quote_sh "-Dblock_drv_rw_whitelist=$2" ;;
--enable-block-drv-whitelist-in-tools) printf "%s" -Dblock_drv_whitelist_in_tools=true ;;
--disable-block-drv-whitelist-in-tools) printf "%s" -Dblock_drv_whitelist_in_tools=false ;;
--enable-bochs) printf "%s" -Dbochs=enabled ;;
--disable-bochs) printf "%s" -Dbochs=disabled ;;
--enable-bpf) printf "%s" -Dbpf=enabled ;;
--disable-bpf) printf "%s" -Dbpf=disabled ;;
--enable-brlapi) printf "%s" -Dbrlapi=enabled ;;
--disable-brlapi) printf "%s" -Dbrlapi=disabled ;;
--enable-bzip2) printf "%s" -Dbzip2=enabled ;;
--disable-bzip2) printf "%s" -Dbzip2=disabled ;;
--enable-canokey) printf "%s" -Dcanokey=enabled ;;
--disable-canokey) printf "%s" -Dcanokey=disabled ;;
--enable-cap-ng) printf "%s" -Dcap_ng=enabled ;;
--disable-cap-ng) printf "%s" -Dcap_ng=disabled ;;
--enable-capstone) printf "%s" -Dcapstone=enabled ;;
--disable-capstone) printf "%s" -Dcapstone=disabled ;;
--enable-cfi) printf "%s" -Dcfi=true ;;
--disable-cfi) printf "%s" -Dcfi=false ;;
--enable-cfi-debug) printf "%s" -Dcfi_debug=true ;;
--disable-cfi-debug) printf "%s" -Dcfi_debug=false ;;
--enable-cloop) printf "%s" -Dcloop=enabled ;;
--disable-cloop) printf "%s" -Dcloop=disabled ;;
--enable-cocoa) printf "%s" -Dcocoa=enabled ;;
--disable-cocoa) printf "%s" -Dcocoa=disabled ;;
--enable-colo-proxy) printf "%s" -Dcolo_proxy=enabled ;;
--disable-colo-proxy) printf "%s" -Dcolo_proxy=disabled ;;
--enable-coreaudio) printf "%s" -Dcoreaudio=enabled ;;
--disable-coreaudio) printf "%s" -Dcoreaudio=disabled ;;
--with-coroutine=*) quote_sh "-Dcoroutine_backend=$2" ;;
--enable-coroutine-pool) printf "%s" -Dcoroutine_pool=true ;;
--disable-coroutine-pool) printf "%s" -Dcoroutine_pool=false ;;
--enable-crypto-afalg) printf "%s" -Dcrypto_afalg=enabled ;;
--disable-crypto-afalg) printf "%s" -Dcrypto_afalg=disabled ;;
--enable-curl) printf "%s" -Dcurl=enabled ;;
--disable-curl) printf "%s" -Dcurl=disabled ;;
--enable-curses) printf "%s" -Dcurses=enabled ;;
--disable-curses) printf "%s" -Dcurses=disabled ;;
--datadir=*) quote_sh "-Ddatadir=$2" ;;
--enable-dbus-display) printf "%s" -Ddbus_display=enabled ;;
--disable-dbus-display) printf "%s" -Ddbus_display=disabled ;;
--enable-debug-info) printf "%s" -Ddebug=true ;;
--disable-debug-info) printf "%s" -Ddebug=false ;;
--enable-debug-graph-lock) printf "%s" -Ddebug_graph_lock=true ;;
--disable-debug-graph-lock) printf "%s" -Ddebug_graph_lock=false ;;
--enable-debug-mutex) printf "%s" -Ddebug_mutex=true ;;
--disable-debug-mutex) printf "%s" -Ddebug_mutex=false ;;
--enable-debug-stack-usage) printf "%s" -Ddebug_stack_usage=true ;;
--disable-debug-stack-usage) printf "%s" -Ddebug_stack_usage=false ;;
--enable-debug-tcg) printf "%s" -Ddebug_tcg=true ;;
--disable-debug-tcg) printf "%s" -Ddebug_tcg=false ;;
--enable-dmg) printf "%s" -Ddmg=enabled ;;
--disable-dmg) printf "%s" -Ddmg=disabled ;;
--docdir=*) quote_sh "-Ddocdir=$2" ;;
--enable-docs) printf "%s" -Ddocs=enabled ;;
--disable-docs) printf "%s" -Ddocs=disabled ;;
--enable-dsound) printf "%s" -Ddsound=enabled ;;
--disable-dsound) printf "%s" -Ddsound=disabled ;;
--enable-fdt) printf "%s" -Dfdt=enabled ;;
--disable-fdt) printf "%s" -Dfdt=disabled ;;
--enable-fdt=*) quote_sh "-Dfdt=$2" ;;
--enable-fuse) printf "%s" -Dfuse=enabled ;;
--disable-fuse) printf "%s" -Dfuse=disabled ;;
--enable-fuse-lseek) printf "%s" -Dfuse_lseek=enabled ;;
--disable-fuse-lseek) printf "%s" -Dfuse_lseek=disabled ;;
--enable-fuzzing) printf "%s" -Dfuzzing=true ;;
--disable-fuzzing) printf "%s" -Dfuzzing=false ;;
--enable-gcrypt) printf "%s" -Dgcrypt=enabled ;;
--disable-gcrypt) printf "%s" -Dgcrypt=disabled ;;
--enable-gettext) printf "%s" -Dgettext=enabled ;;
--disable-gettext) printf "%s" -Dgettext=disabled ;;
--enable-gio) printf "%s" -Dgio=enabled ;;
--disable-gio) printf "%s" -Dgio=disabled ;;
--enable-glusterfs) printf "%s" -Dglusterfs=enabled ;;
--disable-glusterfs) printf "%s" -Dglusterfs=disabled ;;
--enable-gnutls) printf "%s" -Dgnutls=enabled ;;
--disable-gnutls) printf "%s" -Dgnutls=disabled ;;
--enable-gprof) printf "%s" -Dgprof=true ;;
--disable-gprof) printf "%s" -Dgprof=false ;;
--enable-gtk) printf "%s" -Dgtk=enabled ;;
--disable-gtk) printf "%s" -Dgtk=disabled ;;
--enable-gtk-clipboard) printf "%s" -Dgtk_clipboard=enabled ;;
--disable-gtk-clipboard) printf "%s" -Dgtk_clipboard=disabled ;;
--enable-guest-agent) printf "%s" -Dguest_agent=enabled ;;
--disable-guest-agent) printf "%s" -Dguest_agent=disabled ;;
--enable-guest-agent-msi) printf "%s" -Dguest_agent_msi=enabled ;;
--disable-guest-agent-msi) printf "%s" -Dguest_agent_msi=disabled ;;
--enable-hexagon-idef-parser) printf "%s" -Dhexagon_idef_parser=true ;;
--disable-hexagon-idef-parser) printf "%s" -Dhexagon_idef_parser=false ;;
--enable-hvf) printf "%s" -Dhvf=enabled ;;
--disable-hvf) printf "%s" -Dhvf=disabled ;;
--iasl=*) quote_sh "-Diasl=$2" ;;
--enable-iconv) printf "%s" -Diconv=enabled ;;
--disable-iconv) printf "%s" -Diconv=disabled ;;
--includedir=*) quote_sh "-Dincludedir=$2" ;;
--enable-install-blobs) printf "%s" -Dinstall_blobs=true ;;
--disable-install-blobs) printf "%s" -Dinstall_blobs=false ;;
--interp-prefix=*) quote_sh "-Dinterp_prefix=$2" ;;
--enable-jack) printf "%s" -Djack=enabled ;;
--disable-jack) printf "%s" -Djack=disabled ;;
--enable-keyring) printf "%s" -Dkeyring=enabled ;;
--disable-keyring) printf "%s" -Dkeyring=disabled ;;
--enable-kvm) printf "%s" -Dkvm=enabled ;;
--disable-kvm) printf "%s" -Dkvm=disabled ;;
--enable-l2tpv3) printf "%s" -Dl2tpv3=enabled ;;
--disable-l2tpv3) printf "%s" -Dl2tpv3=disabled ;;
--enable-libdaxctl) printf "%s" -Dlibdaxctl=enabled ;;
--disable-libdaxctl) printf "%s" -Dlibdaxctl=disabled ;;
--libdir=*) quote_sh "-Dlibdir=$2" ;;
--enable-libdw) printf "%s" -Dlibdw=enabled ;;
--disable-libdw) printf "%s" -Dlibdw=disabled ;;
--libexecdir=*) quote_sh "-Dlibexecdir=$2" ;;
--enable-libiscsi) printf "%s" -Dlibiscsi=enabled ;;
--disable-libiscsi) printf "%s" -Dlibiscsi=disabled ;;
--enable-libnfs) printf "%s" -Dlibnfs=enabled ;;
--disable-libnfs) printf "%s" -Dlibnfs=disabled ;;
--enable-libpmem) printf "%s" -Dlibpmem=enabled ;;
--disable-libpmem) printf "%s" -Dlibpmem=disabled ;;
--enable-libssh) printf "%s" -Dlibssh=enabled ;;
--disable-libssh) printf "%s" -Dlibssh=disabled ;;
--enable-libudev) printf "%s" -Dlibudev=enabled ;;
--disable-libudev) printf "%s" -Dlibudev=disabled ;;
--enable-libusb) printf "%s" -Dlibusb=enabled ;;
--disable-libusb) printf "%s" -Dlibusb=disabled ;;
--enable-libvduse) printf "%s" -Dlibvduse=enabled ;;
--disable-libvduse) printf "%s" -Dlibvduse=disabled ;;
--enable-linux-aio) printf "%s" -Dlinux_aio=enabled ;;
--disable-linux-aio) printf "%s" -Dlinux_aio=disabled ;;
--enable-linux-io-uring) printf "%s" -Dlinux_io_uring=enabled ;;
--disable-linux-io-uring) printf "%s" -Dlinux_io_uring=disabled ;;
--enable-live-block-migration) printf "%s" -Dlive_block_migration=enabled ;;
--disable-live-block-migration) printf "%s" -Dlive_block_migration=disabled ;;
--localedir=*) quote_sh "-Dlocaledir=$2" ;;
--localstatedir=*) quote_sh "-Dlocalstatedir=$2" ;;
--enable-lzfse) printf "%s" -Dlzfse=enabled ;;
--disable-lzfse) printf "%s" -Dlzfse=disabled ;;
--enable-lzo) printf "%s" -Dlzo=enabled ;;
--disable-lzo) printf "%s" -Dlzo=disabled ;;
--enable-malloc=*) quote_sh "-Dmalloc=$2" ;;
--enable-malloc-trim) printf "%s" -Dmalloc_trim=enabled ;;
--disable-malloc-trim) printf "%s" -Dmalloc_trim=disabled ;;
--mandir=*) quote_sh "-Dmandir=$2" ;;
--enable-membarrier) printf "%s" -Dmembarrier=enabled ;;
--disable-membarrier) printf "%s" -Dmembarrier=disabled ;;
--enable-module-upgrades) printf "%s" -Dmodule_upgrades=true ;;
--disable-module-upgrades) printf "%s" -Dmodule_upgrades=false ;;
--enable-modules) printf "%s" -Dmodules=enabled ;;
--disable-modules) printf "%s" -Dmodules=disabled ;;
--enable-mpath) printf "%s" -Dmpath=enabled ;;
--disable-mpath) printf "%s" -Dmpath=disabled ;;
--enable-multiprocess) printf "%s" -Dmultiprocess=enabled ;;
--disable-multiprocess) printf "%s" -Dmultiprocess=disabled ;;
--enable-netmap) printf "%s" -Dnetmap=enabled ;;
--disable-netmap) printf "%s" -Dnetmap=disabled ;;
--enable-nettle) printf "%s" -Dnettle=enabled ;;
--disable-nettle) printf "%s" -Dnettle=disabled ;;
--enable-numa) printf "%s" -Dnuma=enabled ;;
--disable-numa) printf "%s" -Dnuma=disabled ;;
--enable-nvmm) printf "%s" -Dnvmm=enabled ;;
--disable-nvmm) printf "%s" -Dnvmm=disabled ;;
--enable-opengl) printf "%s" -Dopengl=enabled ;;
--disable-opengl) printf "%s" -Dopengl=disabled ;;
--enable-oss) printf "%s" -Doss=enabled ;;
--disable-oss) printf "%s" -Doss=disabled ;;
--enable-pa) printf "%s" -Dpa=enabled ;;
--disable-pa) printf "%s" -Dpa=disabled ;;
--enable-parallels) printf "%s" -Dparallels=enabled ;;
--disable-parallels) printf "%s" -Dparallels=disabled ;;
--enable-pipewire) printf "%s" -Dpipewire=enabled ;;
--disable-pipewire) printf "%s" -Dpipewire=disabled ;;
--with-pkgversion=*) quote_sh "-Dpkgversion=$2" ;;
--enable-plugins) printf "%s" -Dplugins=true ;;
--disable-plugins) printf "%s" -Dplugins=false ;;
--enable-png) printf "%s" -Dpng=enabled ;;
--disable-png) printf "%s" -Dpng=disabled ;;
--enable-pvrdma) printf "%s" -Dpvrdma=enabled ;;
--disable-pvrdma) printf "%s" -Dpvrdma=disabled ;;
--enable-qcow1) printf "%s" -Dqcow1=enabled ;;
--disable-qcow1) printf "%s" -Dqcow1=disabled ;;
--enable-qed) printf "%s" -Dqed=enabled ;;
--disable-qed) printf "%s" -Dqed=disabled ;;
--firmwarepath=*) quote_sh "-Dqemu_firmwarepath=$(meson_option_build_array $2)" ;;
--enable-qga-vss) printf "%s" -Dqga_vss=enabled ;;
--disable-qga-vss) printf "%s" -Dqga_vss=disabled ;;
--enable-qom-cast-debug) printf "%s" -Dqom_cast_debug=true ;;
--disable-qom-cast-debug) printf "%s" -Dqom_cast_debug=false ;;
--enable-rbd) printf "%s" -Drbd=enabled ;;
--disable-rbd) printf "%s" -Drbd=disabled ;;
--enable-rdma) printf "%s" -Drdma=enabled ;;
--disable-rdma) printf "%s" -Drdma=disabled ;;
--enable-replication) printf "%s" -Dreplication=enabled ;;
--disable-replication) printf "%s" -Dreplication=disabled ;;
--enable-rng-none) printf "%s" -Drng_none=true ;;
--disable-rng-none) printf "%s" -Drng_none=false ;;
--enable-safe-stack) printf "%s" -Dsafe_stack=true ;;
--disable-safe-stack) printf "%s" -Dsafe_stack=false ;;
--enable-sanitizers) printf "%s" -Dsanitizers=true ;;
--disable-sanitizers) printf "%s" -Dsanitizers=false ;;
--enable-sdl) printf "%s" -Dsdl=enabled ;;
--disable-sdl) printf "%s" -Dsdl=disabled ;;
--enable-sdl-image) printf "%s" -Dsdl_image=enabled ;;
--disable-sdl-image) printf "%s" -Dsdl_image=disabled ;;
--enable-seccomp) printf "%s" -Dseccomp=enabled ;;
--disable-seccomp) printf "%s" -Dseccomp=disabled ;;
--enable-selinux) printf "%s" -Dselinux=enabled ;;
--disable-selinux) printf "%s" -Dselinux=disabled ;;
--enable-slirp) printf "%s" -Dslirp=enabled ;;
--disable-slirp) printf "%s" -Dslirp=disabled ;;
--enable-slirp-smbd) printf "%s" -Dslirp_smbd=enabled ;;
--disable-slirp-smbd) printf "%s" -Dslirp_smbd=disabled ;;
--enable-smartcard) printf "%s" -Dsmartcard=enabled ;;
--disable-smartcard) printf "%s" -Dsmartcard=disabled ;;
--enable-snappy) printf "%s" -Dsnappy=enabled ;;
--disable-snappy) printf "%s" -Dsnappy=disabled ;;
--enable-sndio) printf "%s" -Dsndio=enabled ;;
--disable-sndio) printf "%s" -Dsndio=disabled ;;
--enable-sparse) printf "%s" -Dsparse=enabled ;;
--disable-sparse) printf "%s" -Dsparse=disabled ;;
--enable-spice) printf "%s" -Dspice=enabled ;;
--disable-spice) printf "%s" -Dspice=disabled ;;
--enable-spice-protocol) printf "%s" -Dspice_protocol=enabled ;;
--disable-spice-protocol) printf "%s" -Dspice_protocol=disabled ;;
--enable-stack-protector) printf "%s" -Dstack_protector=enabled ;;
--disable-stack-protector) printf "%s" -Dstack_protector=disabled ;;
--enable-strip) printf "%s" -Dstrip=true ;;
--disable-strip) printf "%s" -Dstrip=false ;;
--sysconfdir=*) quote_sh "-Dsysconfdir=$2" ;;
--enable-tcg) printf "%s" -Dtcg=enabled ;;
--disable-tcg) printf "%s" -Dtcg=disabled ;;
--enable-tcg-interpreter) printf "%s" -Dtcg_interpreter=true ;;
--disable-tcg-interpreter) printf "%s" -Dtcg_interpreter=false ;;
--tls-priority=*) quote_sh "-Dtls_priority=$2" ;;
--enable-tools) printf "%s" -Dtools=enabled ;;
--disable-tools) printf "%s" -Dtools=disabled ;;
--enable-tpm) printf "%s" -Dtpm=enabled ;;
--disable-tpm) printf "%s" -Dtpm=disabled ;;
--enable-trace-backends=*) quote_sh "-Dtrace_backends=$2" ;;
--with-trace-file=*) quote_sh "-Dtrace_file=$2" ;;
--enable-tsan) printf "%s" -Dtsan=true ;;
--disable-tsan) printf "%s" -Dtsan=false ;;
--enable-u2f) printf "%s" -Du2f=enabled ;;
--disable-u2f) printf "%s" -Du2f=disabled ;;
--enable-usb-redir) printf "%s" -Dusb_redir=enabled ;;
--disable-usb-redir) printf "%s" -Dusb_redir=disabled ;;
--enable-vde) printf "%s" -Dvde=enabled ;;
--disable-vde) printf "%s" -Dvde=disabled ;;
--enable-vdi) printf "%s" -Dvdi=enabled ;;
--disable-vdi) printf "%s" -Dvdi=disabled ;;
--enable-vduse-blk-export) printf "%s" -Dvduse_blk_export=enabled ;;
--disable-vduse-blk-export) printf "%s" -Dvduse_blk_export=disabled ;;
--enable-vfio-user-server) printf "%s" -Dvfio_user_server=enabled ;;
--disable-vfio-user-server) printf "%s" -Dvfio_user_server=disabled ;;
--enable-vhdx) printf "%s" -Dvhdx=enabled ;;
--disable-vhdx) printf "%s" -Dvhdx=disabled ;;
--enable-vhost-crypto) printf "%s" -Dvhost_crypto=enabled ;;
--disable-vhost-crypto) printf "%s" -Dvhost_crypto=disabled ;;
--enable-vhost-kernel) printf "%s" -Dvhost_kernel=enabled ;;
--disable-vhost-kernel) printf "%s" -Dvhost_kernel=disabled ;;
--enable-vhost-net) printf "%s" -Dvhost_net=enabled ;;
--disable-vhost-net) printf "%s" -Dvhost_net=disabled ;;
--enable-vhost-user) printf "%s" -Dvhost_user=enabled ;;
--disable-vhost-user) printf "%s" -Dvhost_user=disabled ;;
--enable-vhost-user-blk-server) printf "%s" -Dvhost_user_blk_server=enabled ;;
--disable-vhost-user-blk-server) printf "%s" -Dvhost_user_blk_server=disabled ;;
--enable-vhost-vdpa) printf "%s" -Dvhost_vdpa=enabled ;;
--disable-vhost-vdpa) printf "%s" -Dvhost_vdpa=disabled ;;
--enable-virglrenderer) printf "%s" -Dvirglrenderer=enabled ;;
--disable-virglrenderer) printf "%s" -Dvirglrenderer=disabled ;;
--enable-virtfs) printf "%s" -Dvirtfs=enabled ;;
--disable-virtfs) printf "%s" -Dvirtfs=disabled ;;
--enable-virtfs-proxy-helper) printf "%s" -Dvirtfs_proxy_helper=enabled ;;
--disable-virtfs-proxy-helper) printf "%s" -Dvirtfs_proxy_helper=disabled ;;
--enable-vmdk) printf "%s" -Dvmdk=enabled ;;
--disable-vmdk) printf "%s" -Dvmdk=disabled ;;
--enable-vmnet) printf "%s" -Dvmnet=enabled ;;
--disable-vmnet) printf "%s" -Dvmnet=disabled ;;
--enable-vnc) printf "%s" -Dvnc=enabled ;;
--disable-vnc) printf "%s" -Dvnc=disabled ;;
--enable-vnc-jpeg) printf "%s" -Dvnc_jpeg=enabled ;;
--disable-vnc-jpeg) printf "%s" -Dvnc_jpeg=disabled ;;
--enable-vnc-sasl) printf "%s" -Dvnc_sasl=enabled ;;
--disable-vnc-sasl) printf "%s" -Dvnc_sasl=disabled ;;
--enable-vpc) printf "%s" -Dvpc=enabled ;;
--disable-vpc) printf "%s" -Dvpc=disabled ;;
--enable-vte) printf "%s" -Dvte=enabled ;;
--disable-vte) printf "%s" -Dvte=disabled ;;
--enable-vvfat) printf "%s" -Dvvfat=enabled ;;
--disable-vvfat) printf "%s" -Dvvfat=disabled ;;
--enable-whpx) printf "%s" -Dwhpx=enabled ;;
--disable-whpx) printf "%s" -Dwhpx=disabled ;;
--enable-xen) printf "%s" -Dxen=enabled ;;
--disable-xen) printf "%s" -Dxen=disabled ;;
--enable-xen-pci-passthrough) printf "%s" -Dxen_pci_passthrough=enabled ;;
--disable-xen-pci-passthrough) printf "%s" -Dxen_pci_passthrough=disabled ;;
--enable-xkbcommon) printf "%s" -Dxkbcommon=enabled ;;
--disable-xkbcommon) printf "%s" -Dxkbcommon=disabled ;;
--enable-zstd) printf "%s" -Dzstd=enabled ;;
--disable-zstd) printf "%s" -Dzstd=disabled ;;
*) return 1 ;;
esac
}
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