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qemu
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USE flags
- accessibility - Adds support for braille displays using brltty
- aio - Enables support for Linux's Async IO
- alsa - Enable alsa output for sound emulation
- bpf - Enable eBPF support for RSS implementation.
- bzip2 - Use the bzlib compression library
- capstone - Enable disassembly support with dev-libs/capstone
- curl - Support ISOs / -cdrom directives via HTTP or HTTPS.
- debug - Enable extra debug codepaths, like asserts and extra output. If you want to get meaningful backtraces see https://wiki.gentoo.org/wiki/Project:Quality_Assurance/Backtraces
- doc - Add extra documentation (API, Javadoc, etc). It is recommended to enable per package instead of globally
- fdt - Enables firmware device tree support
- filecaps - Use Linux file capabilities to control privilege rather than set*id (this is orthogonal to USE=caps which uses capabilities at runtime e.g. libcap)
- fuse - Enables FUSE block device export
- glusterfs - Enables GlusterFS cluster fileystem via sys-cluster/glusterfs
- gnutls - Enable TLS support for the VNC console server. For 1.4 and newer this also enables WebSocket support. For 2.0 through 2.3 also enables disk quorum support.
- gtk - Add support for x11-libs/gtk+ (The GIMP Toolkit)
- infiniband - Enable Infiniband RDMA transport support
- io-uring - Enable efficient I/O via sys-libs/liburing.
- iscsi - Enable direct iSCSI support via net-libs/libiscsi instead of indirectly via the Linux block layer that sys-block/open-iscsi does.
- jack - Add support for the JACK Audio Connection Kit
- jemalloc - Enable jemalloc allocator support
- jpeg - Enable jpeg image support for the VNC console server
- lzo - Enable support for lzo compression
- multipath - Enable multipath persistent reservation passthrough via sys-fs/multipath-tools.
- ncurses - Enable the ncurses-based console
- nfs - Enable NFS support
- nls - Add Native Language Support (using gettext - GNU locale utilities)
- numa - Enable NUMA support
- opengl - Add support for OpenGL (3D graphics)
- oss - Add support for OSS (Open Sound System)
- pam - Add support for PAM (Pluggable Authentication Modules) - DANGEROUS to arbitrarily flip
- pin-upstream-blobs - Pin the versions of BIOS firmware to the version included in the upstream release. This is needed to sanely support migration/suspend/resume/snapshotting/etc... of instances. When the blobs are different, random corruption/bugs/crashes/etc... may be observed.
- pipewire - Enable pipewire output for sound emulation
- plugins - Enable qemu plugin API via shared library loading.
- png - Enable png image support for the VNC console server
- pulseaudio - Enable pulseaudio output for sound emulation
- python - Add optional support/bindings for the Python language
- python_targets_python3_10 - Build with Python 3.10
- python_targets_python3_11 - Build with Python 3.11
- python_targets_python3_12 - Build with Python 3.12
- python_targets_python3_9 - Build with Python 3.9
- qemu_softmmu_targets_aarch64 - ARM64 system emulation target
- qemu_softmmu_targets_alpha - system emulation target
- qemu_softmmu_targets_arm - system emulation target
- qemu_softmmu_targets_avr - system emulation target
- qemu_softmmu_targets_cris - system emulation target
- qemu_softmmu_targets_hppa - system emulation target
- qemu_softmmu_targets_i386 - system emulation target
- qemu_softmmu_targets_loongarch64 - system emulation target
- qemu_softmmu_targets_m68k - system emulation target
- qemu_softmmu_targets_microblaze - system emulation target
- qemu_softmmu_targets_microblazeel - system emulation target
- qemu_softmmu_targets_mips - system emulation target
- qemu_softmmu_targets_mips64 - system emulation target
- qemu_softmmu_targets_mips64el - system emulation target
- qemu_softmmu_targets_mipsel - system emulation target
- qemu_softmmu_targets_nios2 - system emulation target
- qemu_softmmu_targets_or1k - OpenRISC system emulation target
- qemu_softmmu_targets_ppc - system emulation target
- qemu_softmmu_targets_ppc64 - system emulation target
- qemu_softmmu_targets_riscv32 - system emulation target
- qemu_softmmu_targets_riscv64 - system emulation target
- qemu_softmmu_targets_rx - Renesas RX system emulation target
- qemu_softmmu_targets_s390x - system emulation target
- qemu_softmmu_targets_sh4 - system emulation target
- qemu_softmmu_targets_sh4eb - system emulation target
- qemu_softmmu_targets_sparc - system emulation target
- qemu_softmmu_targets_sparc64 - system emulation target
- qemu_softmmu_targets_tricore - system emulation target
- qemu_softmmu_targets_x86_64 - system emulation target
- qemu_softmmu_targets_xtensa - system emulation target
- qemu_softmmu_targets_xtensaeb - system emulation target
- qemu_user_targets_aarch64 - ARM64 userspace emulation target
- qemu_user_targets_aarch64_be - ARM64 big endian userspace emulation target
- qemu_user_targets_alpha - userspace emulation target
- qemu_user_targets_arm - ARM (little endian) userspace emulation target
- qemu_user_targets_armeb - ARM (big endian) userspace emulation target
- qemu_user_targets_cris - userspace emulation target
- qemu_user_targets_hexagon - Qualcomm hexagon userspace emulation target
- qemu_user_targets_hppa - userspace emulation target
- qemu_user_targets_i386 - userspace emulation target
- qemu_user_targets_loongarch64 - userspace emulation target
- qemu_user_targets_m68k - userspace emulation target
- qemu_user_targets_microblaze - userspace emulation target
- qemu_user_targets_microblazeel - userspace emulation target
- qemu_user_targets_mips - userspace emulation target
- qemu_user_targets_mips64 - userspace emulation target
- qemu_user_targets_mips64el - userspace emulation target
- qemu_user_targets_mipsel - userspace emulation target
- qemu_user_targets_mipsn32 - MIPS N32 ABI userspace emulation target
- qemu_user_targets_mipsn32el - MIPS N32 ABI LE userspace emulation target
- qemu_user_targets_nios2 - userspace emulation target
- qemu_user_targets_or1k - OpenRISC system emulation target
- qemu_user_targets_ppc - PowerPC 32-bit big endian userspace emulation target
- qemu_user_targets_ppc64 - PowerPC 64-bit big endian userspace emulation target
- qemu_user_targets_ppc64le - PowerPC 64-bit little endian userspace emulation target
- qemu_user_targets_riscv32 - userspace emulation target
- qemu_user_targets_riscv64 - userspace emulation target
- qemu_user_targets_s390x - userspace emulation target
- qemu_user_targets_sh4 - userspace emulation target
- qemu_user_targets_sh4eb - userspace emulation target
- qemu_user_targets_sparc - userspace emulation target
- qemu_user_targets_sparc32plus - userspace emulation target
- qemu_user_targets_sparc64 - userspace emulation target
- qemu_user_targets_x86_64 - userspace emulation target
- qemu_user_targets_xtensa - userspace emulation target
- qemu_user_targets_xtensaeb - userspace emulation target
- rbd - Enable rados block device backend support, see https://docs.ceph.com/en/mimic/rbd/qemu-rbd/
- sasl - Add support for the Simple Authentication and Security Layer
- sdl - Enable the SDL-based console
- sdl-image - SDL Image support for icons
- seccomp - Enable seccomp (secure computing mode) to perform system call filtering at runtime to increase security of programs
- selinux - !!internal use only!! Security Enhanced Linux support, this must be set by the selinux profile or breakage will occur
- slirp - Enable TCP/IP in hypervisor via net-libs/libslirp
- smartcard - Enable smartcard support
- snappy - Enable support for Snappy compression (as implemented in app-arch/snappy)
- spice - Enable Spice protocol support via app-emulation/spice
- ssh - Enable SSH based block device support via net-libs/libssh2
- static - Build the User and Software MMU (system) targets as well as tools as static binaries
- static-user - Build the User targets as static binaries
- systemtap - Enable SystemTAP/DTrace tracing
- test - Enable dependencies and/or preparations necessary to run tests (usually controlled by FEATURES=test but can be toggled independently)
- udev - Enable virtual/udev integration (device discovery, power and storage device support, etc)
- usb - Enable USB passthrough via dev-libs/libusb
- usbredir - Use sys-apps/usbredir to redirect USB devices to another machine over TCP
- vde - Enable VDE-based networking
- vhost-net - Enable accelerated networking using vhost-net, see https://www.linux-kvm.org/page/VhostNet
- virgl - Enable experimental Virgil 3d (virtual software GPU)
- virtfs - Enable VirtFS via virtio-9p-pci / fsdev. See https://wiki.qemu.org/Documentation/9psetup
- vnc - Enable VNC (remote desktop viewer) support
- vte - Enable terminal support (x11-libs/vte) in the GTK+ interface
- xattr - Add support for getting and setting POSIX extended attributes, through sys-apps/attr. Requisite for the virtfs backend.
- xen - Enables support for Xen backends
- zstd - Enable support for ZSTD compression
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