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qemu/meson_options.txt
Maciej S. Szmigiero 0d9e8c0b67 Add Hyper-V Dynamic Memory Protocol driver (hv-balloon) base 
This driver is like virtio-balloon on steroids: it allows both changing the
guest memory allocation via ballooning and (in the next patch) inserting
pieces of extra RAM into it on demand from a provided memory backend.

The actual resizing is done via ballooning interface (for example, via
the "balloon" HMP command).
This includes resizing the guest past its boot size - that is, hot-adding
additional memory in granularity limited only by the guest alignment
requirements, as provided by the next patch.

In contrast with ACPI DIMM hotplug where one can only request to unplug a
whole DIMM stick this driver allows removing memory from guest in single
page (4k) units via ballooning.

After a VM reboot the guest is back to its original (boot) size.

In the future, the guest boot memory size might be changed on reboot
instead, taking into account the effective size that VM had before that
reboot (much like Hyper-V does).

For performance reasons, the guest-released memory is tracked in a few
range trees, as a series of (start, count) ranges.
Each time a new page range is inserted into such tree its neighbors are
checked as candidates for possible merging with it.

Besides performance reasons, the Dynamic Memory protocol itself uses page
ranges as the data structure in its messages, so relevant pages need to be
merged into such ranges anyway.

One has to be careful when tracking the guest-released pages, since the
guest can maliciously report returning pages outside its current address
space, which later clash with the address range of newly added memory.
Similarly, the guest can report freeing the same page twice.

The above design results in much better ballooning performance than when
using virtio-balloon with the same guest: 230 GB / minute with this driver
versus 70 GB / minute with virtio-balloon.

During a ballooning operation most of time is spent waiting for the guest
to come up with newly freed page ranges, processing the received ranges on
the host side (in QEMU and KVM) is nearly instantaneous.

The unballoon operation is also pretty much instantaneous:
thanks to the merging of the ballooned out page ranges 200 GB of memory can
be returned to the guest in about 1 second.
With virtio-balloon this operation takes about 2.5 minutes.

These tests were done against a Windows Server 2019 guest running on a
Xeon E5-2699, after dirtying the whole memory inside guest before each
balloon operation.

Using a range tree instead of a bitmap to track the removed memory also
means that the solution scales well with the guest size: even a 1 TB range
takes just a few bytes of such metadata.

Since the required GTree operations aren't present in every Glib version
a check for them was added to the meson build script, together with new
"--enable-hv-balloon" and "--disable-hv-balloon" configure arguments.
If these GTree operations are missing in the system's Glib version this
driver will be skipped during QEMU build.

An optional "status-report=on" device parameter requests memory status
events from the guest (typically sent every second), which allow the host
to learn both the guest memory available and the guest memory in use
counts.

Following commits will add support for their external emission as
"HV_BALLOON_STATUS_REPORT" QMP events.

The driver is named hv-balloon since the Linux kernel client driver for
the Dynamic Memory Protocol is named as such and to follow the naming
pattern established by the virtio-balloon driver.
The whole protocol runs over Hyper-V VMBus.

The driver was tested against Windows Server 2012 R2, Windows Server 2016
and Windows Server 2019 guests and obeys the guest alignment requirements
reported to the host via DM_CAPABILITIES_REPORT message.

Acked-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Maciej S. Szmigiero <maciej.szmigiero@oracle.com>
2023-11-06 14:08:10 +01:00

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# These options do not correspond to a --enable/--disable-* option
# on the configure script command line. If you add more, list them in
# scripts/meson-buildoptions.py's SKIP_OPTIONS constant too.
option('qemu_suffix', type : 'string', value: 'qemu',
description: 'Suffix for QEMU data/modules/config directories (can be empty)')
option('docdir', type : 'string', value : 'share/doc',
description: 'Base directory for documentation installation (can be empty)')
option('qemu_firmwarepath', type : 'array', value : ['share/qemu-firmware'],
description: 'search PATH for firmware files')
option('pkgversion', type : 'string', value : '',
description: 'use specified string as sub-version of the package')
option('smbd', type : 'string', value : '',
description: 'Path to smbd for slirp networking')
option('iasl', type : 'string', value : '',
description: 'Path to ACPI disassembler')
option('tls_priority', type : 'string', value : 'NORMAL',
description: 'Default TLS protocol/cipher priority string')
option('default_devices', type : 'boolean', value : true,
description: 'Include a default selection of devices in emulators')
option('audio_drv_list', type: 'array', value: ['default'],
choices: ['alsa', 'coreaudio', 'default', 'dsound', 'jack', 'oss', 'pa', 'pipewire', 'sdl', 'sndio'],
description: 'Set audio driver list')
option('block_drv_rw_whitelist', type : 'string', value : '',
description: 'set block driver read-write whitelist (by default affects only QEMU, not tools like qemu-img)')
option('block_drv_ro_whitelist', type : 'string', value : '',
description: 'set block driver read-only whitelist (by default affects only QEMU, not tools like qemu-img)')
option('interp_prefix', type : 'string', value : '/usr/gnemul/qemu-%M',
description: 'where to find shared libraries etc., use %M for cpu name')
option('fuzzing_engine', type : 'string', value : '',
description: 'fuzzing engine library for OSS-Fuzz')
option('trace_file', type: 'string', value: 'trace',
description: 'Trace file prefix for simple backend')
option('coroutine_backend', type: 'combo',
choices: ['ucontext', 'sigaltstack', 'windows', 'auto'],
value: 'auto', description: 'coroutine backend to use')
# Everything else can be set via --enable/--disable-* option
# on the configure script command line. After adding an option
# here make sure to run "make update-buildoptions".
option('docs', type : 'feature', value : 'auto',
description: 'Documentations build support')
option('fuzzing', type : 'boolean', value: false,
description: 'build fuzzing targets')
option('gettext', type : 'feature', value : 'auto',
description: 'Localization of the GTK+ user interface')
option('modules', type : 'feature', value : 'disabled',
description: 'modules support (non Windows)')
option('module_upgrades', type : 'boolean', value : false,
description: 'try to load modules from alternate paths for upgrades')
option('install_blobs', type : 'boolean', value : true,
description: 'install provided firmware blobs')
option('sparse', type : 'feature', value : 'auto',
description: 'sparse checker')
option('guest_agent', type : 'feature', value : 'auto',
description: 'Build QEMU Guest Agent')
option('guest_agent_msi', type : 'feature', value : 'auto',
description: 'Build MSI package for the QEMU Guest Agent')
option('tools', type : 'feature', value : 'auto',
description: 'build support utilities that come with QEMU')
option('qga_vss', type : 'feature', value: 'auto',
description: 'build QGA VSS support (broken with MinGW)')
option('malloc_trim', type : 'feature', value : 'auto',
description: 'enable libc malloc_trim() for memory optimization')
option('malloc', type : 'combo', choices : ['system', 'tcmalloc', 'jemalloc'],
value: 'system', description: 'choose memory allocator to use')
option('kvm', type: 'feature', value: 'auto',
description: 'KVM acceleration support')
option('whpx', type: 'feature', value: 'auto',
description: 'WHPX acceleration support')
option('hvf', type: 'feature', value: 'auto',
description: 'HVF acceleration support')
option('nvmm', type: 'feature', value: 'auto',
description: 'NVMM acceleration support')
option('xen', type: 'feature', value: 'auto',
description: 'Xen backend support')
option('xen_pci_passthrough', type: 'feature', value: 'auto',
description: 'Xen PCI passthrough support')
option('tcg', type: 'feature', value: 'enabled',
description: 'TCG support')
option('plugins', type: 'boolean', value: false,
description: 'TCG plugins via shared library loading')
option('debug_tcg', type: 'boolean', value: false,
description: 'TCG debugging')
option('tcg_interpreter', type: 'boolean', value: false,
description: 'TCG with bytecode interpreter (slow)')
option('safe_stack', type: 'boolean', value: false,
description: 'SafeStack Stack Smash Protection (requires clang/llvm and coroutine backend ucontext)')
option('sanitizers', type: 'boolean', value: false,
description: 'enable default sanitizers')
option('tsan', type: 'boolean', value: false,
description: 'enable thread sanitizer')
option('stack_protector', type: 'feature', value: 'auto',
description: 'compiler-provided stack protection')
option('cfi', type: 'boolean', value: false,
description: 'Control-Flow Integrity (CFI)')
option('cfi_debug', type: 'boolean', value: false,
description: 'Verbose errors in case of CFI violation')
option('multiprocess', type: 'feature', value: 'auto',
description: 'Out of process device emulation support')
option('relocatable', type : 'boolean', value : 'true',
description: 'toggle relocatable install')
option('vfio_user_server', type: 'feature', value: 'disabled',
description: 'vfio-user server support')
option('dbus_display', type: 'feature', value: 'auto',
description: '-display dbus support')
option('tpm', type : 'feature', value : 'auto',
description: 'TPM support')
# Do not enable it by default even for Mingw32, because it doesn't
# work on Wine.
option('membarrier', type: 'feature', value: 'disabled',
description: 'membarrier system call (for Linux 4.14+ or Windows')
option('avx2', type: 'feature', value: 'auto',
description: 'AVX2 optimizations')
option('avx512f', type: 'feature', value: 'disabled',
description: 'AVX512F optimizations')
option('avx512bw', type: 'feature', value: 'auto',
description: 'AVX512BW optimizations')
option('keyring', type: 'feature', value: 'auto',
description: 'Linux keyring support')
option('libkeyutils', type: 'feature', value: 'auto',
description: 'Linux keyutils support')
option('af_xdp', type : 'feature', value : 'auto',
description: 'AF_XDP network backend support')
option('attr', type : 'feature', value : 'auto',
description: 'attr/xattr support')
option('auth_pam', type : 'feature', value : 'auto',
description: 'PAM access control')
option('brlapi', type : 'feature', value : 'auto',
description: 'brlapi character device driver')
option('bzip2', type : 'feature', value : 'auto',
description: 'bzip2 support for DMG images')
option('cap_ng', type : 'feature', value : 'auto',
description: 'cap_ng support')
option('blkio', type : 'feature', value : 'auto',
description: 'libblkio block device driver')
option('bpf', type : 'feature', value : 'auto',
description: 'eBPF support')
option('cocoa', type : 'feature', value : 'auto',
description: 'Cocoa user interface (macOS only)')
option('curl', type : 'feature', value : 'auto',
description: 'CURL block device driver')
option('gio', type : 'feature', value : 'auto',
description: 'use libgio for D-Bus support')
option('glusterfs', type : 'feature', value : 'auto',
description: 'Glusterfs block device driver')
option('hv_balloon', type : 'feature', value : 'auto',
description: 'hv-balloon driver (requires Glib 2.68+ GTree API)')
option('libdw', type : 'feature', value : 'auto',
description: 'debuginfo support')
option('libiscsi', type : 'feature', value : 'auto',
description: 'libiscsi userspace initiator')
option('libnfs', type : 'feature', value : 'auto',
description: 'libnfs block device driver')
option('mpath', type : 'feature', value : 'auto',
description: 'Multipath persistent reservation passthrough')
option('numa', type : 'feature', value : 'auto',
description: 'libnuma support')
option('iconv', type : 'feature', value : 'auto',
description: 'Font glyph conversion support')
option('curses', type : 'feature', value : 'auto',
description: 'curses UI')
option('gnutls', type : 'feature', value : 'auto',
description: 'GNUTLS cryptography support')
option('nettle', type : 'feature', value : 'auto',
description: 'nettle cryptography support')
option('gcrypt', type : 'feature', value : 'auto',
description: 'libgcrypt cryptography support')
option('crypto_afalg', type : 'feature', value : 'disabled',
description: 'Linux AF_ALG crypto backend driver')
option('libdaxctl', type : 'feature', value : 'auto',
description: 'libdaxctl support')
option('libpmem', type : 'feature', value : 'auto',
description: 'libpmem support')
option('libssh', type : 'feature', value : 'auto',
description: 'ssh block device support')
option('libudev', type : 'feature', value : 'auto',
description: 'Use libudev to enumerate host devices')
option('libusb', type : 'feature', value : 'auto',
description: 'libusb support for USB passthrough')
option('linux_aio', type : 'feature', value : 'auto',
description: 'Linux AIO support')
option('linux_io_uring', type : 'feature', value : 'auto',
description: 'Linux io_uring support')
option('lzfse', type : 'feature', value : 'auto',
description: 'lzfse support for DMG images')
option('lzo', type : 'feature', value : 'auto',
description: 'lzo compression support')
option('rbd', type : 'feature', value : 'auto',
description: 'Ceph block device driver')
option('opengl', type : 'feature', value : 'auto',
description: 'OpenGL support')
option('rdma', type : 'feature', value : 'auto',
description: 'Enable RDMA-based migration')
option('pvrdma', type : 'feature', value : 'auto',
description: 'Enable PVRDMA support')
option('gtk', type : 'feature', value : 'auto',
description: 'GTK+ user interface')
option('sdl', type : 'feature', value : 'auto',
description: 'SDL user interface')
option('sdl_image', type : 'feature', value : 'auto',
description: 'SDL Image support for icons')
option('seccomp', type : 'feature', value : 'auto',
description: 'seccomp support')
option('smartcard', type : 'feature', value : 'auto',
description: 'CA smartcard emulation support')
option('snappy', type : 'feature', value : 'auto',
description: 'snappy compression support')
option('spice', type : 'feature', value : 'auto',
description: 'Spice server support')
option('spice_protocol', type : 'feature', value : 'auto',
description: 'Spice protocol support')
option('u2f', type : 'feature', value : 'auto',
description: 'U2F emulation support')
option('canokey', type : 'feature', value : 'auto',
description: 'CanoKey support')
option('usb_redir', type : 'feature', value : 'auto',
description: 'libusbredir support')
option('l2tpv3', type : 'feature', value : 'auto',
description: 'l2tpv3 network backend support')
option('netmap', type : 'feature', value : 'auto',
description: 'netmap network backend support')
option('slirp', type: 'feature', value: 'auto',
description: 'libslirp user mode network backend support')
option('vde', type : 'feature', value : 'auto',
description: 'vde network backend support')
option('vmnet', type : 'feature', value : 'auto',
description: 'vmnet.framework network backend support')
option('virglrenderer', type : 'feature', value : 'auto',
description: 'virgl rendering support')
option('rutabaga_gfx', type : 'feature', value : 'auto',
description: 'rutabaga_gfx support')
option('png', type : 'feature', value : 'auto',
description: 'PNG support with libpng')
option('vnc', type : 'feature', value : 'auto',
description: 'VNC server')
option('vnc_jpeg', type : 'feature', value : 'auto',
description: 'JPEG lossy compression for VNC server')
option('vnc_sasl', type : 'feature', value : 'auto',
description: 'SASL authentication for VNC server')
option('vte', type : 'feature', value : 'auto',
description: 'vte support for the gtk UI')
# GTK Clipboard implementation is disabled by default, since it may cause hangs
# of the guest VCPUs. See gitlab issue 1150:
# https://gitlab.com/qemu-project/qemu/-/issues/1150
option('gtk_clipboard', type: 'feature', value : 'disabled',
description: 'clipboard support for the gtk UI (EXPERIMENTAL, MAY HANG)')
option('xkbcommon', type : 'feature', value : 'auto',
description: 'xkbcommon support')
option('zstd', type : 'feature', value : 'auto',
description: 'zstd compression support')
option('fuse', type: 'feature', value: 'auto',
description: 'FUSE block device export')
option('fuse_lseek', type : 'feature', value : 'auto',
description: 'SEEK_HOLE/SEEK_DATA support for FUSE exports')
option('trace_backends', type: 'array', value: ['log'],
choices: ['dtrace', 'ftrace', 'log', 'nop', 'simple', 'syslog', 'ust'],
description: 'Set available tracing backends')
option('alsa', type: 'feature', value: 'auto',
description: 'ALSA sound support')
option('coreaudio', type: 'feature', value: 'auto',
description: 'CoreAudio sound support')
option('dsound', type: 'feature', value: 'auto',
description: 'DirectSound sound support')
option('jack', type: 'feature', value: 'auto',
description: 'JACK sound support')
option('oss', type: 'feature', value: 'auto',
description: 'OSS sound support')
option('pa', type: 'feature', value: 'auto',
description: 'PulseAudio sound support')
option('pipewire', type: 'feature', value: 'auto',
description: 'PipeWire sound support')
option('sndio', type: 'feature', value: 'auto',
description: 'sndio sound support')
option('vhost_kernel', type: 'feature', value: 'auto',
description: 'vhost kernel backend support')
option('vhost_net', type: 'feature', value: 'auto',
description: 'vhost-net kernel acceleration support')
option('vhost_user', type: 'feature', value: 'auto',
description: 'vhost-user backend support')
option('vhost_crypto', type: 'feature', value: 'auto',
description: 'vhost-user crypto backend support')
option('vhost_vdpa', type: 'feature', value: 'auto',
description: 'vhost-vdpa kernel backend support')
option('vhost_user_blk_server', type: 'feature', value: 'auto',
description: 'build vhost-user-blk server')
option('virtfs', type: 'feature', value: 'auto',
description: 'virtio-9p support')
option('virtfs_proxy_helper', type: 'feature', value: 'auto',
description: 'virtio-9p proxy helper support')
option('libvduse', type: 'feature', value: 'auto',
description: 'build VDUSE Library')
option('vduse_blk_export', type: 'feature', value: 'auto',
description: 'VDUSE block export support')
option('capstone', type: 'feature', value: 'auto',
description: 'Whether and how to find the capstone library')
option('fdt', type: 'combo', value: 'auto',
choices: ['disabled', 'enabled', 'auto', 'system', 'internal'],
description: 'Whether and how to find the libfdt library')
option('selinux', type: 'feature', value: 'auto',
description: 'SELinux support in qemu-nbd')
option('live_block_migration', type: 'feature', value: 'auto',
description: 'block migration in the main migration stream')
option('replication', type: 'feature', value: 'auto',
description: 'replication support')
option('colo_proxy', type: 'feature', value: 'auto',
description: 'colo-proxy support')
option('bochs', type: 'feature', value: 'auto',
description: 'bochs image format support')
option('cloop', type: 'feature', value: 'auto',
description: 'cloop image format support')
option('dmg', type: 'feature', value: 'auto',
description: 'dmg image format support')
option('qcow1', type: 'feature', value: 'auto',
description: 'qcow1 image format support')
option('vdi', type: 'feature', value: 'auto',
description: 'vdi image format support')
option('vhdx', type: 'feature', value: 'auto',
description: 'vhdx image format support')
option('vmdk', type: 'feature', value: 'auto',
description: 'vmdk image format support')
option('vpc', type: 'feature', value: 'auto',
description: 'vpc image format support')
option('vvfat', type: 'feature', value: 'auto',
description: 'vvfat image format support')
option('qed', type: 'feature', value: 'auto',
description: 'qed image format support')
option('parallels', type: 'feature', value: 'auto',
description: 'parallels image format support')
option('block_drv_whitelist_in_tools', type: 'boolean', value: false,
description: 'use block whitelist also in tools instead of only QEMU')
option('rng_none', type: 'boolean', value: false,
description: 'dummy RNG, avoid using /dev/(u)random and getrandom()')
option('coroutine_pool', type: 'boolean', value: true,
description: 'coroutine freelist (better performance)')
option('debug_graph_lock', type: 'boolean', value: false,
description: 'graph lock debugging support')
option('debug_mutex', type: 'boolean', value: false,
description: 'mutex debugging support')
option('debug_stack_usage', type: 'boolean', value: false,
description: 'measure coroutine stack usage')
option('qom_cast_debug', type: 'boolean', value: true,
description: 'cast debugging support')
option('slirp_smbd', type : 'feature', value : 'auto',
description: 'use smbd (at path --smbd=*) in slirp networking')
option('qemu_ga_manufacturer', type: 'string', value: 'QEMU',
description: '"manufacturer" name for qemu-ga registry entries')
option('qemu_ga_distro', type: 'string', value: 'Linux',
description: 'second path element in qemu-ga registry entries')
option('qemu_ga_version', type: 'string', value: '',
description: 'version number for qemu-ga installer')
option('hexagon_idef_parser', type : 'boolean', value : true,
description: 'use idef-parser to automatically generate TCG code for the Hexagon frontend')
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