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MICROVM revision 1.2 
      1 # $NetBSD: MICROVM,v 1.2 2025/03/27 12:22:44 riastradh Exp $
      2 #
      3 # MICROVM kernel configuration, for use with Qemu microvm machine type
      4 # or Firecracker.
      5 # Stripped-down configuration with no PCI, use VirtIO over MMIO virtual
      6 # bus instead. ACPI is disabled as Firecracker doesn't support it,
      7 # use legacy MP tables instead.
      8 #
      9 # Exemple qemu usage on a Linux host to boot a NetBSD guest:
     10 #
     11 # qemu-system-x86_64							\
     12 # 	-M microvm,x-option-roms=off,rtc=on,acpi=off,pic=off,accel=kvm	\
     13 # 	-m 256 -cpu host -kernel ${KERNEL} 				\
     14 # 	-append "root=ld0a console=com rw -z"				\
     15 # 	-display none -device virtio-blk-device,drive=hd0		\
     16 # 	-drive file=${IMG},format=raw,id=hd0				\
     17 # 	-device virtio-net-device,netdev=net0 				\
     18 # 	-netdev user,id=net0,ipv6=off,hostfwd=::2200-:22		\
     19 # 	-global virtio-mmio.force-legacy=false -serial stdio
     20 
     21 machine i386 x86 xen
     22 include         "conf/std"      # MI standard options
     23 include         "arch/xen/conf/std.xenversion"
     24 
     25 options         CPU_IN_CKSUM
     26 options         EXEC_ELF32      # exec ELF binaries
     27 options         EXEC_SCRIPT     # exec #! scripts
     28 options         MTRR
     29 options         MULTIPROCESSOR
     30 
     31 options         CHILD_MAX=1024  # 160 is too few
     32 options         OPEN_MAX=1024   # 128 is too few
     33 
     34 mainbus0 at root
     35 cpu* at mainbus?
     36 ioapic* at mainbus? apid ?
     37 
     38 options 	INCLUDE_CONFIG_FILE	# embed config file in kernel binary
     39 maxusers	8		# estimated number of users
     40 
     41 options 	INSECURE	# disable kernel security levels - X needs this
     42 
     43 options 	RTC_OFFSET=0	# hardware clock is this many mins. west of GMT
     44 
     45 options 	PIPE_SOCKETPAIR	# smaller, but slower pipe(2)
     46 
     47 # Xen PV support for PVH and HVM guests, needed for PVH boot
     48 options 	XENPVHVM
     49 options 	XEN
     50 hypervisor*	at mainbus?		# Xen hypervisor
     51 xenbus*	 	at hypervisor?		# Xen virtual bus
     52 xencons*	at hypervisor?		# Xen virtual console
     53 
     54 # Include NetBSD 10 compatibility
     55 options		COMPAT_100
     56 #
     57 # Because gcc omits the frame pointer for any -O level, the line below
     58 # is needed to make backtraces in DDB work.
     59 #
     60 makeoptions	COPTS="-O2 -fno-omit-frame-pointer"
     61 
     62 # File systems
     63 #include "conf/filesystems.config"
     64 file-system FFS
     65 file-system EXT2FS
     66 file-system KERNFS
     67 file-system MFS
     68 file-system TMPFS
     69 file-system PTYFS
     70 file-system MSDOSFS
     71 file-system PROCFS
     72 
     73 options		DKWEDGE_AUTODISCOVER
     74 options		DKWEDGE_METHOD_GPT
     75 # File system options
     76 # ffs
     77 options 	FFS_NO_SNAPSHOT	# No FFS snapshot support
     78 options 	WAPBL		# File system journaling support
     79 
     80 # Networking options
     81 #options 	GATEWAY		# packet forwarding
     82 options 	INET		# IP + ICMP + TCP + UDP
     83 options 	INET6		# IPV6
     84 
     85 # Kernel root file system and dump configuration.
     86 config		netbsd	root on ? type ?
     87 
     88 #
     89 # Device configuration
     90 #
     91 
     92 # ACPI will be used if present. If not it will fall back to MPBIOS
     93 options 	MPBIOS			# configure CPUs and APICs using MPBIOS
     94 # Provide bug-for-bug compatibility with Linux in MP Table searching
     95 # and parsing.  Firecracker relies on these bugs.
     96 options		MPTABLE_LINUX_BUG_COMPAT
     97 
     98 #pci*	at mainbus? bus ?
     99 #acpi0	at mainbus0
    100 
    101 # ISA bus support
    102 isa0	at mainbus?
    103 
    104 # ISA serial interfaces
    105 com0	at isa? port 0x3f8 irq 4	# Standard PC serial ports
    106 
    107 # Virtual bus for non-PCI devices
    108 pv* at pvbus?
    109 
    110 ## Virtio devices
    111 # Use MMIO by default
    112 virtio* at pv?
    113 #virtio* at acpi?
    114 #virtio* at pci? dev ? function ?	# Virtio PCI device
    115 
    116 include "dev/virtio/virtio.config"
    117 no viomb* at virtio?			# XXX ?
    118 no vioscsi* at virtio?			# XXX ?
    119 
    120 pseudo-device	md			# memory disk device (ramdisk)
    121 #options 	MEMORY_DISK_HOOKS	# enable md specific hooks
    122 #options 	MEMORY_DISK_DYNAMIC	# enable dynamic resizing
    123 #
    124 pseudo-device	vnd			# disk-like interface to files
    125 #options 	VND_COMPRESSION		# compressed vnd(4)
    126 
    127 ## network pseudo-devices
    128 pseudo-device	bpfilter		# Berkeley packet filter
    129 pseudo-device	loop			# network loopback
    130 
    131 ## miscellaneous pseudo-devices
    132 pseudo-device	pty			# pseudo-terminals
    133 # userland interface to drivers, including autoconf and properties retrieval
    134 pseudo-device	drvctl
    135 
    136 file-system	PUFFS
    137 pseudo-device	putter
    138