KVMに特化したミニマリスト・カーネル
Native Infernoをビルドしてみて、そういえば昔はLinuxも1FDディストリビューションとかあって、フロッピーディスクに収まるぐらい小さくできたんだよなぁと昔を懐かしんでいた（嘘）。Ubuntu 8.10のカーネルはvmlinuzで2.3MB強で、さらにモジュールの方が容量的には一桁大きい。さて、このような最新の（肥大化した）Linuxカーネルでもフロッピーディスクに収まるぐらい小さくカスタマイズできるものだろうか？ ソフトウェアは基本的に単調増加するもので、肥大化の運命は避けられない。とはいえ、コア部分はフロッピーディスクサイズに収まるよね？
しかし、いまどきのPCにフロッピーディスクなんて付いてないし、1FDディストリビューションなんて作っても現実的じゃないので、仮想化環境に特化するとどれくらいカーネルが小さくできるか挑戦してみた。ただし、ssh経由でログインできるようにネットワーク機能は削らない。サイズもそうだけど、起動時間が短縮できるとうれしい（むしろそちらがメイン）。あと、サイズに比例してコンパイル時間も短くなるので、なおエコだ。で、具体的にはKVMをターゲットにした。
結論から言うと、（bootchartで測定した）起動時間は10秒から4秒になり、vmlinuzのサイズは2.34MBから1.07MBになった。カーネルモジュールも無効にしているので、1.07MBはすべてのドライバを含んだサイズである。
やったことはというと、make menuconfigでひたすらいらなそうなコンフィグを潰すという作業なのだけど、KVMを前提にしているので、ネットワークやブロックデバイスはvirtioのドライバを使ったというのがポイント。起動時間の短縮に一番効果があったのは、virtio ブロックデバイスを使うことでATA+SCSIのドライバ初期化時間が削減できた点だ。やはりデバイスの初期化はハードウェアの応答を待つ必要があるので時間を食っている。
さらにカーネルモジュールを無効にして、initrdを使うのもやめた。実はここで「おや？」と思う現象がいくつか出てきたので、メモっておく。まず、grubのルートファイルシステムの指定を「root=UUID=...」の代わりに「root=/dev/vda1」にする必要がある。virtio blkはuuidに未対応なのだろうか？ 次に、make-kpkgでdebパッケージを作っているんだけど、dpkg -i時にmkinitrdできないとエラーになる。これは単純に無視すればよいだけなんだけど、Debianの問題なのか、何か回避方法があるのかわからない。また、bootchartが動かなくなってしまった。これはUbuntuの場合、initrdの中でbootchartを起動するようになっているからだと推測できる。
あともう一つ不明な点。コンフィグを削った影響だと思うけど、reboot(8)を実行しても次のように表示されてhang upするので、virshからdestroy & startしなければいけなくなってしまった。ホストOSから見るとkvmプロセスがCPU 100%食っているし。何が悪さしているんだろう。
* Will now restart Restarting system.
キーボードドライバも外してしまったので、ひょっとしてリセット信号が飛ばなくなっているのかも？とも思ったけどdoubtで、virtio blkを使うとリセットしなくなるようだ。たぶん、ここに書かれたバグ。ということでホストOSをUbuntu 8.10から9.04にupgradeしたところ（KVMのバージョンは72から84になった）、この問題は起きなくなった。
とりあえずこんなところでオシマイ。最後に設定ファイルを曝しておくので、興味のある方は参考にしてください。
（追記）IntelがNetbookやMID用に開発しているLinuxディストリビューションMoblinのfastbootって仕組みが面白そうだ。組込みLinuxだとサスペンド／レジューム機能を利用してスナップショットによる起動の高速化というアプローチがいろいろやられていたけど、fastbootのアプローチはある意味正攻法でカーネル、init、Xに手を入れることで、現状でも5秒でデスクトップが起動するところまで実現されている。へぇ。
（追記２）fastboot（カーネル）の肝はデバイスを非同期に認識する点にあるようだ。ということは、virtio blk/netを使った時点でもう恩恵はそれほど得られない気がする。まぁ、試してみろってことだけど。
libvirtの設定
libvirtを使ってKVMを利用している。ネットワークとディスクの設定を変えたのと、ptyの設定を追加した。
<domain type='kvm'>
<name>vm1</name>
<uuid>6c7aa691-1d51-67f1-ff86-a03412e431dd</uuid>
<memory>524288</memory>
<currentMemory>524288</currentMemory>
<vcpu>1</vcpu>
<os>
<type>hvm</type>
<boot dev='hd'/>
</os>
<features>
<acpi/>
</features>
<clock offset='utc'/>
<on_poweroff>destroy</on_poweroff>
<on_reboot>restart</on_reboot>
<on_crash>destroy</on_crash>
<devices>
<emulator>/usr/bin/kvm</emulator>
<disk type='file' device='disk'>
<source file='/opt/kvm/ubuntu-kvm/disk0.qcow2'/>
<target dev='vda' bus='virtio'/>
</disk>
<interface type='bridge'>
<mac address='00:16:36:3b:66:a2'/>
<source bridge='br0'/>
<model type='virtio'/>
</interface>
<serial type='pty'>
<target port='0'/>
</serial>
<console type='pty'>
<target port='0'/>
</console>
<input type='mouse' bus='ps2'/>
<graphics type='vnc' port='-1' listen='127.0.0.1'/>
</devices>
</domain>
カーネルコンフィグ
まだ、削る余地はあると思う。ここが削れるとかこれはまずいというのがあったら教えてください。例えば、ゲストOSにKVMサポートは不要なので削れるねとか。
# # Automatically generated make config: don't edit # Linux kernel version: 2.6.27.18 # Thu Jun 18 19:55:53 2009 # CONFIG_64BIT=y # CONFIG_X86_32 is not set CONFIG_X86_64=y CONFIG_X86=y CONFIG_ARCH_DEFCONFIG="arch/x86/configs/x86_64_defconfig" # CONFIG_GENERIC_LOCKBREAK is not set CONFIG_GENERIC_TIME=y CONFIG_GENERIC_CMOS_UPDATE=y CONFIG_CLOCKSOURCE_WATCHDOG=y CONFIG_GENERIC_CLOCKEVENTS=y CONFIG_GENERIC_CLOCKEVENTS_BROADCAST=y CONFIG_LOCKDEP_SUPPORT=y CONFIG_STACKTRACE_SUPPORT=y CONFIG_HAVE_LATENCYTOP_SUPPORT=y CONFIG_FAST_CMPXCHG_LOCAL=y CONFIG_MMU=y CONFIG_ZONE_DMA=y CONFIG_GENERIC_ISA_DMA=y CONFIG_GENERIC_IOMAP=y CONFIG_GENERIC_BUG=y CONFIG_GENERIC_HWEIGHT=y # CONFIG_GENERIC_GPIO is not set CONFIG_ARCH_MAY_HAVE_PC_FDC=y CONFIG_RWSEM_GENERIC_SPINLOCK=y # CONFIG_RWSEM_XCHGADD_ALGORITHM is not set # CONFIG_ARCH_HAS_ILOG2_U32 is not set # CONFIG_ARCH_HAS_ILOG2_U64 is not set CONFIG_ARCH_HAS_CPU_IDLE_WAIT=y CONFIG_GENERIC_CALIBRATE_DELAY=y CONFIG_GENERIC_TIME_VSYSCALL=y CONFIG_ARCH_HAS_CPU_RELAX=y CONFIG_ARCH_HAS_DEFAULT_IDLE=y CONFIG_ARCH_HAS_CACHE_LINE_SIZE=y # CONFIG_HAVE_SETUP_PER_CPU_AREA is not set # CONFIG_HAVE_CPUMASK_OF_CPU_MAP is not set CONFIG_ARCH_HIBERNATION_POSSIBLE=y CONFIG_ARCH_SUSPEND_POSSIBLE=y CONFIG_ZONE_DMA32=y CONFIG_ARCH_POPULATES_NODE_MAP=y CONFIG_AUDIT_ARCH=y CONFIG_ARCH_SUPPORTS_AOUT=y CONFIG_ARCH_SUPPORTS_OPTIMIZED_INLINING=y CONFIG_GENERIC_HARDIRQS=y CONFIG_GENERIC_IRQ_PROBE=y CONFIG_X86_BIOS_REBOOT=y # CONFIG_KTIME_SCALAR is not set CONFIG_DEFCONFIG_LIST="/lib/modules/$UNAME_RELEASE/.config" # # General setup # CONFIG_EXPERIMENTAL=y CONFIG_BROKEN_ON_SMP=y CONFIG_INIT_ENV_ARG_LIMIT=32 CONFIG_LOCALVERSION="" # CONFIG_LOCALVERSION_AUTO is not set CONFIG_VERSION_SIGNATURE="Ubuntu 2.6.27-9.19-server" CONFIG_SWAP=y CONFIG_SYSVIPC=y CONFIG_SYSVIPC_SYSCTL=y CONFIG_POSIX_MQUEUE=y CONFIG_BSD_PROCESS_ACCT=y CONFIG_BSD_PROCESS_ACCT_V3=y # CONFIG_TASKSTATS is not set # CONFIG_AUDIT is not set # CONFIG_IKCONFIG is not set CONFIG_LOG_BUF_SHIFT=16 # CONFIG_CGROUPS is not set CONFIG_HAVE_UNSTABLE_SCHED_CLOCK=y # CONFIG_GROUP_SCHED is not set # CONFIG_SYSFS_DEPRECATED_V2 is not set CONFIG_RELAY=y # CONFIG_NAMESPACES is not set # CONFIG_BLK_DEV_INITRD is not set CONFIG_CC_OPTIMIZE_FOR_SIZE=y CONFIG_SYSCTL=y CONFIG_EMBEDDED=y CONFIG_SYSCTL_SYSCALL=y CONFIG_KALLSYMS=y # CONFIG_KALLSYMS_EXTRA_PASS is not set CONFIG_HOTPLUG=y CONFIG_PRINTK=y CONFIG_BUG=y CONFIG_ELF_CORE=y CONFIG_PCSPKR_PLATFORM=y # CONFIG_COMPAT_BRK is not set # CONFIG_BASE_FULL is not set CONFIG_FUTEX=y CONFIG_ANON_INODES=y CONFIG_EPOLL=y CONFIG_SIGNALFD=y CONFIG_TIMERFD=y CONFIG_EVENTFD=y CONFIG_SHMEM=y CONFIG_VM_EVENT_COUNTERS=y # CONFIG_SLUB_DEBUG is not set # CONFIG_SLAB is not set CONFIG_SLUB=y # CONFIG_SLOB is not set # CONFIG_PROFILING is not set # CONFIG_MARKERS is not set CONFIG_HAVE_OPROFILE=y CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS=y CONFIG_HAVE_IOREMAP_PROT=y CONFIG_HAVE_KPROBES=y CONFIG_HAVE_KRETPROBES=y # CONFIG_HAVE_ARCH_TRACEHOOK is not set # CONFIG_HAVE_DMA_ATTRS is not set # CONFIG_USE_GENERIC_SMP_HELPERS is not set # CONFIG_HAVE_CLK is not set # CONFIG_PROC_PAGE_MONITOR is not set # CONFIG_HAVE_GENERIC_DMA_COHERENT is not set CONFIG_RT_MUTEXES=y # CONFIG_TINY_SHMEM is not set CONFIG_BASE_SMALL=1 # CONFIG_MODULES is not set CONFIG_BLOCK=y # CONFIG_BLK_DEV_IO_TRACE is not set # CONFIG_BLK_DEV_BSG is not set # CONFIG_BLK_DEV_INTEGRITY is not set # # IO Schedulers # CONFIG_IOSCHED_NOOP=y # CONFIG_IOSCHED_AS is not set # CONFIG_IOSCHED_DEADLINE is not set CONFIG_IOSCHED_CFQ=y # CONFIG_DEFAULT_AS is not set # CONFIG_DEFAULT_DEADLINE is not set CONFIG_DEFAULT_CFQ=y # CONFIG_DEFAULT_NOOP is not set CONFIG_DEFAULT_IOSCHED="cfq" CONFIG_PREEMPT_NOTIFIERS=y CONFIG_CLASSIC_RCU=y # # Processor type and features # CONFIG_TICK_ONESHOT=y # CONFIG_NO_HZ is not set CONFIG_HIGH_RES_TIMERS=y CONFIG_GENERIC_CLOCKEVENTS_BUILD=y # CONFIG_SMP is not set CONFIG_X86_FIND_SMP_CONFIG=y CONFIG_X86_MPPARSE=y CONFIG_X86_PC=y # CONFIG_X86_ELAN is not set # CONFIG_X86_VOYAGER is not set # CONFIG_X86_GENERICARCH is not set # CONFIG_X86_VSMP is not set CONFIG_PARAVIRT_GUEST=y # CONFIG_XEN is not set CONFIG_KVM_CLOCK=y CONFIG_KVM_GUEST=y CONFIG_PARAVIRT=y CONFIG_PARAVIRT_CLOCK=y # CONFIG_MEMTEST is not set # CONFIG_M386 is not set # CONFIG_M486 is not set # CONFIG_M586 is not set # CONFIG_M586TSC is not set # CONFIG_M586MMX is not set # CONFIG_M686 is not set # CONFIG_MPENTIUMII is not set # CONFIG_MPENTIUMIII is not set # CONFIG_MPENTIUMM is not set # CONFIG_MPENTIUM4 is not set # CONFIG_MK6 is not set # CONFIG_MK7 is not set # CONFIG_MK8 is not set # CONFIG_MCRUSOE is not set # CONFIG_MEFFICEON is not set # CONFIG_MWINCHIPC6 is not set # CONFIG_MWINCHIP2 is not set # CONFIG_MWINCHIP3D is not set # CONFIG_MGEODEGX1 is not set # CONFIG_MGEODE_LX is not set # CONFIG_MCYRIXIII is not set # CONFIG_MVIAC3_2 is not set # CONFIG_MVIAC7 is not set # CONFIG_MPSC is not set # CONFIG_MCORE2 is not set CONFIG_GENERIC_CPU=y CONFIG_X86_CPU=y CONFIG_X86_L1_CACHE_BYTES=128 CONFIG_X86_INTERNODE_CACHE_BYTES=128 CONFIG_X86_CMPXCHG=y CONFIG_X86_L1_CACHE_SHIFT=7 CONFIG_X86_WP_WORKS_OK=y CONFIG_X86_TSC=y CONFIG_X86_CMPXCHG64=y CONFIG_X86_CMOV=y CONFIG_X86_MINIMUM_CPU_FAMILY=64 CONFIG_X86_DEBUGCTLMSR=y CONFIG_HPET_TIMER=y CONFIG_HPET_EMULATE_RTC=y # CONFIG_DMI is not set # CONFIG_GART_IOMMU is not set # CONFIG_CALGARY_IOMMU is not set CONFIG_SWIOTLB=y CONFIG_IOMMU_HELPER=y CONFIG_PREEMPT_NONE=y # CONFIG_PREEMPT_VOLUNTARY is not set # CONFIG_PREEMPT is not set CONFIG_X86_LOCAL_APIC=y CONFIG_X86_IO_APIC=y # CONFIG_X86_MCE is not set # CONFIG_I8K is not set # CONFIG_MICROCODE is not set # CONFIG_X86_MSR is not set # CONFIG_X86_CPUID is not set CONFIG_ARCH_SPARSEMEM_DEFAULT=y CONFIG_ARCH_SPARSEMEM_ENABLE=y CONFIG_ARCH_SELECT_MEMORY_MODEL=y CONFIG_SELECT_MEMORY_MODEL=y # CONFIG_FLATMEM_MANUAL is not set # CONFIG_DISCONTIGMEM_MANUAL is not set CONFIG_SPARSEMEM_MANUAL=y CONFIG_SPARSEMEM=y CONFIG_HAVE_MEMORY_PRESENT=y # CONFIG_SPARSEMEM_STATIC is not set CONFIG_SPARSEMEM_EXTREME=y CONFIG_SPARSEMEM_VMEMMAP_ENABLE=y # CONFIG_SPARSEMEM_VMEMMAP is not set # CONFIG_MEMORY_HOTPLUG is not set CONFIG_PAGEFLAGS_EXTENDED=y CONFIG_SPLIT_PTLOCK_CPUS=4 CONFIG_RESOURCES_64BIT=y CONFIG_ZONE_DMA_FLAG=1 CONFIG_BOUNCE=y CONFIG_VIRT_TO_BUS=y CONFIG_MMU_NOTIFIER=y # CONFIG_X86_RESERVE_LOW_64K is not set # CONFIG_MTRR is not set # CONFIG_SECCOMP is not set CONFIG_HZ_100=y # CONFIG_HZ_250 is not set # CONFIG_HZ_300 is not set # CONFIG_HZ_1000 is not set CONFIG_HZ=100 CONFIG_SCHED_HRTICK=y # CONFIG_KEXEC is not set # CONFIG_CRASH_DUMP is not set CONFIG_PHYSICAL_START=0x200000 # CONFIG_RELOCATABLE is not set CONFIG_PHYSICAL_ALIGN=0x200000 CONFIG_ARCH_ENABLE_MEMORY_HOTPLUG=y # # Power management options # # CONFIG_PM is not set # # CPU Frequency scaling # # CONFIG_CPU_FREQ is not set # CONFIG_CPU_IDLE is not set # # Bus options (PCI etc.) # CONFIG_PCI=y CONFIG_PCI_DIRECT=y CONFIG_PCI_DOMAINS=y CONFIG_PCIEPORTBUS=y CONFIG_PCIEAER=y # CONFIG_PCIEASPM is not set CONFIG_ARCH_SUPPORTS_MSI=y CONFIG_PCI_MSI=y CONFIG_PCI_LEGACY=y # CONFIG_HT_IRQ is not set CONFIG_ISA_DMA_API=y # CONFIG_PCCARD is not set # CONFIG_HOTPLUG_PCI is not set # # Executable file formats / Emulations # CONFIG_BINFMT_ELF=y # CONFIG_BINFMT_MISC is not set # CONFIG_IA32_EMULATION is not set # CONFIG_COMPAT_FOR_U64_ALIGNMENT is not set CONFIG_NET=y # # Networking options # # CONFIG_PACKET is not set CONFIG_UNIX=y # CONFIG_NET_KEY is not set CONFIG_INET=y # CONFIG_IP_MULTICAST is not set # CONFIG_IP_ADVANCED_ROUTER is not set CONFIG_IP_FIB_HASH=y # CONFIG_IP_PNP is not set # CONFIG_NET_IPIP is not set # CONFIG_NET_IPGRE is not set # CONFIG_ARPD is not set # CONFIG_SYN_COOKIES is not set # CONFIG_INET_AH is not set # CONFIG_INET_ESP is not set # CONFIG_INET_IPCOMP is not set # CONFIG_INET_XFRM_TUNNEL is not set # CONFIG_INET_TUNNEL is not set # CONFIG_INET_XFRM_MODE_TRANSPORT is not set # CONFIG_INET_XFRM_MODE_TUNNEL is not set # CONFIG_INET_XFRM_MODE_BEET is not set # CONFIG_INET_LRO is not set # CONFIG_INET_DIAG is not set # CONFIG_TCP_CONG_ADVANCED is not set CONFIG_TCP_CONG_CUBIC=y CONFIG_DEFAULT_TCP_CONG="cubic" # CONFIG_TCP_MD5SIG is not set # CONFIG_IPV6 is not set # CONFIG_NETWORK_SECMARK is not set # CONFIG_NETFILTER is not set # CONFIG_IP_DCCP is not set # CONFIG_IP_SCTP is not set # CONFIG_TIPC is not set # CONFIG_ATM is not set # CONFIG_BRIDGE is not set # CONFIG_VLAN_8021Q is not set # CONFIG_DECNET is not set # CONFIG_LLC2 is not set # CONFIG_IPX is not set # CONFIG_ATALK is not set # CONFIG_X25 is not set # CONFIG_LAPB is not set # CONFIG_ECONET is not set # CONFIG_WAN_ROUTER is not set # CONFIG_NET_SCHED is not set # # Network testing # # CONFIG_NET_PKTGEN is not set # CONFIG_HAMRADIO is not set # CONFIG_CAN is not set # CONFIG_IRDA is not set # CONFIG_BT is not set # CONFIG_AF_RXRPC is not set # # Wireless # # CONFIG_CFG80211 is not set # CONFIG_WIRELESS_EXT is not set # CONFIG_MAC80211 is not set # CONFIG_IEEE80211 is not set # CONFIG_RFKILL is not set # CONFIG_NET_9P is not set # # Device Drivers # # # Generic Driver Options # CONFIG_UEVENT_HELPER_PATH="/sbin/hotplug" # CONFIG_STANDALONE is not set # CONFIG_PREVENT_FIRMWARE_BUILD is not set # CONFIG_FW_LOADER is not set # CONFIG_SYS_HYPERVISOR is not set # CONFIG_CONNECTOR is not set # CONFIG_MTD is not set # CONFIG_PARPORT is not set CONFIG_BLK_DEV=y # CONFIG_BLK_DEV_FD is not set # CONFIG_BLK_CPQ_DA is not set # CONFIG_BLK_CPQ_CISS_DA is not set # CONFIG_BLK_DEV_DAC960 is not set # CONFIG_BLK_DEV_UMEM is not set # CONFIG_BLK_DEV_COW_COMMON is not set # CONFIG_BLK_DEV_LOOP is not set # CONFIG_BLK_DEV_NBD is not set # CONFIG_BLK_DEV_SX8 is not set # CONFIG_BLK_DEV_RAM is not set # CONFIG_CDROM_PKTCDVD is not set # CONFIG_ATA_OVER_ETH is not set CONFIG_VIRTIO_BLK=y # CONFIG_BLK_DEV_HD is not set # CONFIG_MISC_DEVICES is not set CONFIG_HAVE_IDE=y # CONFIG_IDE is not set # # SCSI device support # # CONFIG_RAID_ATTRS is not set # CONFIG_SCSI is not set # CONFIG_SCSI_DMA is not set # CONFIG_SCSI_NETLINK is not set # CONFIG_ATA is not set # CONFIG_MD is not set # CONFIG_FUSION is not set # # IEEE 1394 (FireWire) support # # # Enable only one of the two stacks, unless you know what you are doing # # CONFIG_FIREWIRE is not set # CONFIG_IEEE1394 is not set # CONFIG_I2O is not set # CONFIG_MACINTOSH_DRIVERS is not set CONFIG_NETDEVICES=y # CONFIG_DUMMY is not set # CONFIG_BONDING is not set # CONFIG_MACVLAN is not set # CONFIG_EQUALIZER is not set # CONFIG_TUN is not set # CONFIG_VETH is not set # CONFIG_ARCNET is not set # CONFIG_NET_ETHERNET is not set # CONFIG_NETDEV_1000 is not set # CONFIG_NETDEV_10000 is not set # CONFIG_TR is not set # # Wireless LAN # # CONFIG_WLAN_PRE80211 is not set # CONFIG_WLAN_80211 is not set # CONFIG_IWLWIFI_LEDS is not set # CONFIG_WAN is not set # CONFIG_FDDI is not set # CONFIG_HIPPI is not set # CONFIG_PPP is not set # CONFIG_SLIP is not set # CONFIG_NETCONSOLE is not set # CONFIG_NETPOLL is not set # CONFIG_NET_POLL_CONTROLLER is not set CONFIG_VIRTIO_NET=y # CONFIG_ISDN is not set # CONFIG_PHONE is not set # # Input device support # CONFIG_INPUT=y # CONFIG_INPUT_FF_MEMLESS is not set # CONFIG_INPUT_POLLDEV is not set # # Userland interfaces # # CONFIG_INPUT_MOUSEDEV is not set # CONFIG_INPUT_JOYDEV is not set # CONFIG_INPUT_EVDEV is not set # CONFIG_INPUT_EVBUG is not set # # Input Device Drivers # # CONFIG_INPUT_KEYBOARD is not set # CONFIG_INPUT_MOUSE is not set # CONFIG_INPUT_JOYSTICK is not set # CONFIG_INPUT_TABLET is not set # CONFIG_INPUT_TOUCHSCREEN is not set # CONFIG_INPUT_MISC is not set # # Hardware I/O ports # # CONFIG_SERIO is not set # CONFIG_GAMEPORT is not set # # Character devices # CONFIG_VT=y CONFIG_CONSOLE_TRANSLATIONS=y CONFIG_VT_CONSOLE=y CONFIG_HW_CONSOLE=y CONFIG_VT_HW_CONSOLE_BINDING=y CONFIG_DEVKMEM=y # CONFIG_SERIAL_NONSTANDARD is not set # CONFIG_NOZOMI is not set # # Serial drivers # CONFIG_SERIAL_8250=y CONFIG_SERIAL_8250_CONSOLE=y CONFIG_FIX_EARLYCON_MEM=y CONFIG_SERIAL_8250_PCI=y CONFIG_SERIAL_8250_NR_UARTS=48 CONFIG_SERIAL_8250_RUNTIME_UARTS=4 CONFIG_SERIAL_8250_EXTENDED=y CONFIG_SERIAL_8250_MANY_PORTS=y CONFIG_SERIAL_8250_SHARE_IRQ=y # CONFIG_SERIAL_8250_DETECT_IRQ is not set CONFIG_SERIAL_8250_RSA=y # # Non-8250 serial port support # CONFIG_SERIAL_CORE=y CONFIG_SERIAL_CORE_CONSOLE=y # CONFIG_SERIAL_JSM is not set CONFIG_UNIX98_PTYS=y # CONFIG_LEGACY_PTYS is not set CONFIG_HVC_DRIVER=y CONFIG_VIRTIO_CONSOLE=y # CONFIG_IPMI_HANDLER is not set # CONFIG_HW_RANDOM is not set # CONFIG_NVRAM is not set # CONFIG_R3964 is not set # CONFIG_APPLICOM is not set # CONFIG_MWAVE is not set # CONFIG_PC8736x_GPIO is not set # CONFIG_RAW_DRIVER is not set # CONFIG_HANGCHECK_TIMER is not set # CONFIG_TCG_TPM is not set # CONFIG_TELCLOCK is not set CONFIG_DEVPORT=y # CONFIG_I2C is not set # CONFIG_SPI is not set CONFIG_ARCH_WANT_OPTIONAL_GPIOLIB=y # CONFIG_GPIOLIB is not set # CONFIG_W1 is not set # CONFIG_POWER_SUPPLY is not set # CONFIG_HWMON is not set # CONFIG_THERMAL is not set # CONFIG_THERMAL_HWMON is not set # CONFIG_WATCHDOG is not set # # Sonics Silicon Backplane # CONFIG_SSB_POSSIBLE=y # CONFIG_SSB is not set # # Multifunction device drivers # # CONFIG_MFD_CORE is not set # CONFIG_MFD_SM501 is not set # CONFIG_HTC_PASIC3 is not set # CONFIG_MFD_TMIO is not set # # Multimedia devices # # # Multimedia core support # # CONFIG_VIDEO_DEV is not set # CONFIG_DVB_CORE is not set # CONFIG_VIDEO_MEDIA is not set # # Multimedia drivers # # CONFIG_DAB is not set # # Graphics support # # CONFIG_AGP is not set # CONFIG_DRM is not set # CONFIG_VGASTATE is not set # CONFIG_VIDEO_OUTPUT_CONTROL is not set # CONFIG_FB is not set # CONFIG_BACKLIGHT_LCD_SUPPORT is not set # # Display device support # # CONFIG_DISPLAY_SUPPORT is not set # # Console display driver support # # CONFIG_VGA_CONSOLE is not set CONFIG_DUMMY_CONSOLE=y # CONFIG_SOUND is not set # CONFIG_HID_SUPPORT is not set # CONFIG_USB_SUPPORT is not set # CONFIG_MMC is not set # CONFIG_MEMSTICK is not set # CONFIG_NEW_LEDS is not set # CONFIG_ACCESSIBILITY is not set # CONFIG_INFINIBAND is not set # CONFIG_EDAC is not set CONFIG_RTC_LIB=y CONFIG_RTC_CLASS=y CONFIG_RTC_HCTOSYS=y CONFIG_RTC_HCTOSYS_DEVICE="rtc0" # CONFIG_RTC_DEBUG is not set # # RTC interfaces # CONFIG_RTC_INTF_SYSFS=y CONFIG_RTC_INTF_PROC=y CONFIG_RTC_INTF_DEV=y CONFIG_RTC_INTF_DEV_UIE_EMUL=y # CONFIG_RTC_DRV_TEST is not set # # SPI RTC drivers # # # Platform RTC drivers # CONFIG_RTC_DRV_CMOS=y # CONFIG_RTC_DRV_DS1511 is not set # CONFIG_RTC_DRV_DS1553 is not set # CONFIG_RTC_DRV_DS1742 is not set # CONFIG_RTC_DRV_STK17TA8 is not set # CONFIG_RTC_DRV_M48T86 is not set # CONFIG_RTC_DRV_M48T59 is not set # CONFIG_RTC_DRV_V3020 is not set # # on-CPU RTC drivers # # CONFIG_DMADEVICES is not set # CONFIG_UIO is not set # # Ubuntu Supplied Third-Party Device Drivers # # CONFIG_BLK_DEV_DRBD is not set # CONFIG_SQUASHFS is not set # CONFIG_AUFS is not set # CONFIG_ATL2 is not set # CONFIG_NET_ET131X is not set # CONFIG_NDISWRAPPER is not set # # Compcache options # # CONFIG_BLK_DEV_COMPCACHE is not set # # Two Level Segregate Fit Allocator # # CONFIG_TLSF is not set # CONFIG_FSAM7400 is not set # CONFIG_TP_SMAPI is not set # CONFIG_TP_SMAPI_EC is not set # # Media related drivers # # # Wireless Drivers # # CONFIG_P80211 is not set # CONFIG_PRISM2_USB is not set # CONFIG_HECI is not set # CONFIG_E1000E_NEW is not set # CONFIG_E1000E_ENABLED is not set # CONFIG_AVERATEC_5100P is not set # CONFIG_PACKARDBELL_E5 is not set # CONFIG_FS_UNIONFS is not set # CONFIG_LIRC_DEV is not set # CONFIG_GNBD is not set # CONFIG_GFS_FS is not set # # Firmware Drivers # # CONFIG_EDD is not set # CONFIG_FIRMWARE_MEMMAP is not set # CONFIG_DELL_RBU is not set # CONFIG_DCDBAS is not set # CONFIG_ISCSI_IBFT_FIND is not set # # File systems # # CONFIG_EXT2_FS is not set CONFIG_EXT3_FS=y CONFIG_EXT3_FS_XATTR=y CONFIG_EXT3_FS_POSIX_ACL=y CONFIG_EXT3_FS_SECURITY=y # CONFIG_EXT4DEV_FS is not set CONFIG_JBD=y # CONFIG_JBD_DEBUG is not set CONFIG_FS_MBCACHE=y # CONFIG_REISERFS_FS is not set # CONFIG_JFS_FS is not set CONFIG_FS_POSIX_ACL=y # CONFIG_XFS_FS is not set # CONFIG_GFS2_FS is not set # CONFIG_OCFS2_FS is not set CONFIG_DNOTIFY=y CONFIG_INOTIFY=y CONFIG_INOTIFY_USER=y CONFIG_QUOTA=y CONFIG_QUOTA_NETLINK_INTERFACE=y # CONFIG_PRINT_QUOTA_WARNING is not set # CONFIG_QFMT_V1 is not set # CONFIG_QFMT_V2 is not set CONFIG_QUOTACTL=y # CONFIG_AUTOFS_FS is not set # CONFIG_AUTOFS4_FS is not set # CONFIG_FUSE_FS is not set CONFIG_GENERIC_ACL=y # # CD-ROM/DVD Filesystems # # CONFIG_ISO9660_FS is not set # CONFIG_UDF_FS is not set # # DOS/FAT/NT Filesystems # # CONFIG_MSDOS_FS is not set # CONFIG_VFAT_FS is not set # CONFIG_NTFS_FS is not set # # Pseudo filesystems # CONFIG_PROC_FS=y CONFIG_PROC_KCORE=y CONFIG_PROC_SYSCTL=y CONFIG_SYSFS=y CONFIG_TMPFS=y CONFIG_TMPFS_POSIX_ACL=y # CONFIG_HUGETLBFS is not set # CONFIG_HUGETLB_PAGE is not set # CONFIG_CONFIGFS_FS is not set # # Miscellaneous filesystems # # CONFIG_ADFS_FS is not set # CONFIG_AFFS_FS is not set # CONFIG_HFS_FS is not set # CONFIG_HFSPLUS_FS is not set # CONFIG_BEFS_FS is not set # CONFIG_BFS_FS is not set # CONFIG_EFS_FS is not set # CONFIG_CRAMFS is not set # CONFIG_VXFS_FS is not set # CONFIG_MINIX_FS is not set # CONFIG_OMFS_FS is not set # CONFIG_HPFS_FS is not set # CONFIG_QNX4FS_FS is not set # CONFIG_ROMFS_FS is not set # CONFIG_SYSV_FS is not set # CONFIG_UFS_FS is not set # CONFIG_NETWORK_FILESYSTEMS is not set # # Partition Types # # CONFIG_PARTITION_ADVANCED is not set CONFIG_MSDOS_PARTITION=y # CONFIG_NLS is not set # CONFIG_DLM is not set # # Kernel hacking # CONFIG_TRACE_IRQFLAGS_SUPPORT=y # CONFIG_PRINTK_TIME is not set # CONFIG_ENABLE_WARN_DEPRECATED is not set # CONFIG_ENABLE_MUST_CHECK is not set CONFIG_FRAME_WARN=2048 # CONFIG_MAGIC_SYSRQ is not set # CONFIG_UNUSED_SYMBOLS is not set CONFIG_DEBUG_FS=y # CONFIG_HEADERS_CHECK is not set # CONFIG_DEBUG_KERNEL is not set # CONFIG_DEBUG_BUGVERBOSE is not set # CONFIG_DEBUG_MEMORY_INIT is not set # CONFIG_LATENCYTOP is not set # CONFIG_SYSCTL_SYSCALL_CHECK is not set CONFIG_HAVE_FTRACE=y CONFIG_HAVE_DYNAMIC_FTRACE=y # CONFIG_FTRACE is not set # CONFIG_IRQSOFF_TRACER is not set # CONFIG_SYSPROF_TRACER is not set # CONFIG_SCHED_TRACER is not set # CONFIG_CONTEXT_SWITCH_TRACER is not set # CONFIG_PROVIDE_OHCI1394_DMA_INIT is not set # CONFIG_SAMPLES is not set CONFIG_HAVE_ARCH_KGDB=y # CONFIG_STRICT_DEVMEM is not set # CONFIG_X86_VERBOSE_BOOTUP is not set # CONFIG_EARLY_PRINTK is not set CONFIG_IO_DELAY_TYPE_0X80=0 CONFIG_IO_DELAY_TYPE_0XED=1 CONFIG_IO_DELAY_TYPE_UDELAY=2 CONFIG_IO_DELAY_TYPE_NONE=3 # CONFIG_IO_DELAY_0X80 is not set CONFIG_IO_DELAY_0XED=y # CONFIG_IO_DELAY_UDELAY is not set # CONFIG_IO_DELAY_NONE is not set CONFIG_DEFAULT_IO_DELAY_TYPE=1 # CONFIG_OPTIMIZE_INLINING is not set # # Security options # # CONFIG_KEYS is not set # CONFIG_SECURITY is not set # CONFIG_SECURITY_FILE_CAPABILITIES is not set # CONFIG_CRYPTO is not set CONFIG_HAVE_KVM=y CONFIG_VIRTUALIZATION=y CONFIG_KVM=y CONFIG_KVM_INTEL=y # CONFIG_KVM_AMD is not set CONFIG_VIRTIO=y CONFIG_VIRTIO_RING=y CONFIG_VIRTIO_PCI=y CONFIG_VIRTIO_BALLOON=y # # Library routines # CONFIG_BITREVERSE=y CONFIG_GENERIC_FIND_FIRST_BIT=y CONFIG_GENERIC_FIND_NEXT_BIT=y # CONFIG_CRC_CCITT is not set # CONFIG_CRC16 is not set CONFIG_CRC_T10DIF=y # CONFIG_CRC_ITU_T is not set CONFIG_CRC32=y # CONFIG_CRC7 is not set CONFIG_LIBCRC32C=y CONFIG_PLIST=y CONFIG_HAS_IOMEM=y CONFIG_HAS_IOPORT=y CONFIG_HAS_DMA=y
