Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/amd64/conf/FIRECRACKER
Version:
- FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10
SearchContext: - none - 3 - 10
1 # 2 # FIRECRACKER -- kernel configuration file for Firecracker VM 3 # 4 # This is largely a stripped-down version of the GENERIC kernel configuration 5 # file, without drivers for hardware which will never appear inside the 6 # Firecracker VM environment. It adds support for the Virtio MMIO bus, 7 # which Firecracker uses for exposing devices, and legacy mptable, which 8 # Firecracker uses for exposing information about CPUs (since it doesn't 9 # support ACPI). 10 # 11 # Since Firecracker loads the kernel directly via the PVH boot protocol, 12 # it bypasses the boot loader; some environment variables are hard-coded 13 # here which would normally be provided via device hints or loader.conf. 14 # 15 # For more information about the Firecracker VM, see: 16 # 17 # https://firecracker-microvm.github.io/ 18 19 cpu HAMMER 20 ident FIRECRACKER 21 22 makeoptions DEBUG=-g # Build kernel with gdb(1) debug symbols 23 makeoptions WITH_CTF=1 # Run ctfconvert(1) for DTrace support 24 25 options SCHED_ULE # ULE scheduler 26 options NUMA # Non-Uniform Memory Architecture support 27 options PREEMPTION # Enable kernel thread preemption 28 options VIMAGE # Subsystem virtualization, e.g. VNET 29 options INET # InterNETworking 30 options INET6 # IPv6 communications protocols 31 options IPSEC_SUPPORT # Allow kldload of ipsec and tcpmd5 32 options ROUTE_MPATH # Multipath routing support 33 options FIB_ALGO # Modular fib lookups 34 options TCP_OFFLOAD # TCP offload 35 options TCP_BLACKBOX # Enhanced TCP event logging 36 options TCP_HHOOK # hhook(9) framework for TCP 37 options TCP_RFC7413 # TCP Fast Open 38 options SCTP_SUPPORT # Allow kldload of SCTP 39 options KERN_TLS # TLS transmit & receive offload 40 options FFS # Berkeley Fast Filesystem 41 options SOFTUPDATES # Enable FFS soft updates support 42 options UFS_ACL # Support for access control lists 43 options UFS_DIRHASH # Improve performance on big directories 44 options UFS_GJOURNAL # Enable gjournal-based UFS journaling 45 options QUOTA # Enable disk quotas for UFS 46 options MD_ROOT # MD is a potential root device 47 options NFSCL # Network Filesystem Client 48 options NFSD # Network Filesystem Server 49 options NFSLOCKD # Network Lock Manager 50 options NFS_ROOT # NFS usable as /, requires NFSCL 51 options MSDOSFS # MSDOS Filesystem 52 options CD9660 # ISO 9660 Filesystem 53 options PROCFS # Process filesystem (requires PSEUDOFS) 54 options PSEUDOFS # Pseudo-filesystem framework 55 options TMPFS # Efficient memory filesystem 56 options GEOM_RAID # Soft RAID functionality. 57 options GEOM_LABEL # Provides labelization 58 options EFIRT # EFI Runtime Services support 59 options COMPAT_FREEBSD32 # Compatible with i386 binaries 60 options COMPAT_FREEBSD4 # Compatible with FreeBSD4 61 options COMPAT_FREEBSD5 # Compatible with FreeBSD5 62 options COMPAT_FREEBSD6 # Compatible with FreeBSD6 63 options COMPAT_FREEBSD7 # Compatible with FreeBSD7 64 options COMPAT_FREEBSD9 # Compatible with FreeBSD9 65 options COMPAT_FREEBSD10 # Compatible with FreeBSD10 66 options COMPAT_FREEBSD11 # Compatible with FreeBSD11 67 options COMPAT_FREEBSD12 # Compatible with FreeBSD12 68 options COMPAT_FREEBSD13 # Compatible with FreeBSD13 69 options SCSI_DELAY=5000 # Delay (in ms) before probing SCSI 70 options KTRACE # ktrace(1) support 71 options STACK # stack(9) support 72 options SYSVSHM # SYSV-style shared memory 73 options SYSVMSG # SYSV-style message queues 74 options SYSVSEM # SYSV-style semaphores 75 options _KPOSIX_PRIORITY_SCHEDULING # POSIX P1003_1B real-time extensions 76 options PRINTF_BUFR_SIZE=128 # Prevent printf output being interspersed. 77 options KBD_INSTALL_CDEV # install a CDEV entry in /dev 78 options HWPMC_HOOKS # Necessary kernel hooks for hwpmc(4) 79 options AUDIT # Security event auditing 80 options CAPABILITY_MODE # Capsicum capability mode 81 options CAPABILITIES # Capsicum capabilities 82 options MAC # TrustedBSD MAC Framework 83 options KDTRACE_FRAME # Ensure frames are compiled in 84 options KDTRACE_HOOKS # Kernel DTrace hooks 85 options DDB_CTF # Kernel ELF linker loads CTF data 86 options INCLUDE_CONFIG_FILE # Include this file in kernel 87 options RACCT # Resource accounting framework 88 options RACCT_DEFAULT_TO_DISABLED # Set kern.racct.enable=0 by default 89 options RCTL # Resource limits 90 91 # Debugging support. Always need this: 92 options KDB # Enable kernel debugger support. 93 options KDB_TRACE # Print a stack trace for a panic. 94 # For full debugger support use (turn off in stable branch): 95 options BUF_TRACKING # Track buffer history 96 options DDB # Support DDB. 97 options FULL_BUF_TRACKING # Track more buffer history 98 options GDB # Support remote GDB. 99 options DEADLKRES # Enable the deadlock resolver 100 options INVARIANTS # Enable calls of extra sanity checking 101 options INVARIANT_SUPPORT # Extra sanity checks of internal structures, required by INVARIANTS 102 options QUEUE_MACRO_DEBUG_TRASH # Trash queue(2) internal pointers on invalidation 103 options WITNESS # Enable checks to detect deadlocks and cycles 104 options WITNESS_SKIPSPIN # Don't run witness on spinlocks for speed 105 options MALLOC_DEBUG_MAXZONES=8 # Separate malloc(9) zones 106 options VERBOSE_SYSINIT=0 # Support debug.verbose_sysinit, off by default 107 108 # Kernel dump features. 109 options EKCD # Support for encrypted kernel dumps 110 options GZIO # gzip-compressed kernel and user dumps 111 options ZSTDIO # zstd-compressed kernel and user dumps 112 options DEBUGNET # debugnet networking 113 options NETDUMP # netdump(4) client support 114 options NETGDB # netgdb(4) client support 115 116 # Make an SMP-capable kernel by default 117 options SMP # Symmetric MultiProcessor Kernel 118 options EARLY_AP_STARTUP 119 120 # Pseudo devices. 121 device crypto # core crypto support 122 device aesni # AES-NI OpenCrypto module 123 device loop # Network loopback 124 device rdrand_rng # Intel Bull Mountain RNG 125 device ether # Ethernet support 126 device vlan # 802.1Q VLAN support 127 device tuntap # Packet tunnel. 128 device md # Memory "disks" 129 device gif # IPv6 and IPv4 tunneling 130 device firmware # firmware assist module 131 device xz # lzma decompression 132 device bpf # Berkeley packet filter 133 134 # Serial (COM) ports 135 device uart # Generic UART driver 136 137 # VirtIO support 138 device virtio # Generic VirtIO bus (required) 139 device virtio_mmio # VirtIO MMIO bus 140 device vtnet # VirtIO Ethernet device 141 device virtio_blk # VirtIO Block device 142 143 # Linux KVM paravirtualization support 144 device kvm_clock # KVM paravirtual clock driver 145 146 # Netmap provides direct access to TX/RX rings on supported NICs 147 device netmap # netmap(4) support 148 149 # Firecracker exposes information via the legacy MP Table mechanism 150 # rather than via ACPI (which it does not implement). 151 device mptable 152 153 # Firecracker launches the FreeBSD kernel directly, via the PVH boot 154 # protocol, rather than via the boot loader; as such, we need to bake 155 # device hints into the kernel configuration rather than relying on 156 # device.hints being loaded, and likewise have no loader.conf to place 157 # other settings into. 158 envvar hint.uart.0.at="isa" 159 envvar hint.uart.0.port="0x3F8" 160 envvar hint.uart.0.flags="0x10" 161 envvar hint.uart.0.irq="0x4" 162 envvar hint.acpi.0.disabled="1" 163 164 # Inside a VM, "power off" doesn't really yank the AC power, so there's 165 # no need to worry about disks flushing caches before losing power. 166 envvar kern.shutdown.poweroff_delay="0" 167 168 # Firecracker seems to have a bug in its UART emulation. This works 169 # around the problem. 170 envvar hw.broken_txfifo="1" 171 172 # We don't have an early timecounter to calibrate the TSC against, so 173 # skip that; later in the boot process we have other timecounters. 174 envvar machdep.disable_tsc_calibration="1" 175 176 # Provide bug-for-bug compatiblity with Linux in MP Table searching 177 # and parsing. Firecracker relies on these bugs. 178 options MPTABLE_LINUX_BUG_COMPAT 179 180 # Disable the automatic registration of a PCI bridge; we do in fact 181 # not have one. 182 options NO_LEGACY_PCIB 183 184 # Bus support. 185 # Note that Firecracker provides neither ACPI nor PCI; but removing these 186 # devices currently (2022-07-09) prevents the kernel from building. 187 device acpi 188 device pci 189 190 # Xen HVM Guest Optimizations 191 # NOTE: XENHVM depends on xenpci and xentimer. 192 # They must be added or removed together. 193 # NOTE: These are present in FIRECRACKER because the PVH boot method 194 # originates from Xen; once that code is untangled these can be removed. 195 options XENHVM # Xen HVM kernel infrastructure 196 device xenpci # Xen HVM Hypervisor services driver 197 device xentimer # Xen x86 PV timer device
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