Native Linux KVM tool 的使用

2013-08-29 posted in [linux]

下文的操作都是在 ubuntu12.04 x86_64 下进行，其他 linux 发行版应该也是类似的。关于文件系统的使用详见linux rootfs.img 文件的使用。

LKVM 测试运行

$ sudo apt-get install kvm ubuntu-virt-server kvm-ipxe
$ git clone git://github.com/penberg/linux-kvm.git
$ cd linux-kvm
$ make x86_64_defconfig
$ cp .config confif_x64_def
$ make menuconfig
$ diff .config confif_x64_def  | grep '=y'
```
    < CONFIG_KVMTOOL_TEST_ENABLE=y   # 选上这个下面的选项默认都会选上
    < CONFIG_NET_9P=y
    < CONFIG_NET_9P_VIRTIO=y
    < CONFIG_VIRTIO_BLK=y
    < CONFIG_VIRTIO_NET=y
    < CONFIG_CONSOLE_POLL=y
    < CONFIG_HVC_DRIVER=y
    < CONFIG_VIRTIO_CONSOLE=y
    < CONFIG_VIRTIO=y
    < CONFIG_VIRTIO_PCI=y
    < CONFIG_9P_FS=y
    < CONFIG_KGDB=y
    < CONFIG_KGDB_SERIAL_CONSOLE=y
 ```
$ make -j4
$ cd tools/kvm/
$ make -j4
$ wget http://wiki.qemu.org/download/linux-0.2.img.bz2
$ bunzip2 linux-0.2.img.bz2
$ sudo ./lkvm  run -d linux-0.2.img

LKVM 网络功能的使用

$ sudo ./lkvm run  -d domU-x86_64-FS.img --network virtio

虚拟机正常起来后，主机会生成 tap0 虚拟网卡，将虚拟机中的网卡的 ip 和 tap0 的 ip 设到同一网段，主/虚拟机间的网络就通了。

TUN/TAP 相关概念

In computer networking, TUN and TAP are virtual network kernel devices. They are network devices that are supported entirely in software, which is different from ordinary network devices that are backed up by hardware network adapters.

TAP (as in network tap) simulates a link layer device and it operates with layer 2 packets such as Ethernet frames. TUN (as in network TUNnel) simulates a network layer device and it operates with layer 3 packets such as IP packets. TAP is used to create a network bridge, while TUN is used with routing.

LKVM kgdb 内核调试

添加kgdb 相关启动参数，启动内核：

$ sudo ./lkvm run -p "kgdboc=ttyS1 kgdbwait" --tty 1 -d domU-x86_64-FS.img

虚拟机系统起来之后，可以通过一下命令，让目标系统进入调试模式：

$ echo g >| /proc/sysrq-trigger

主机通过下面命令链接虚拟机，进行调试：

$ sudo gdb ../../vmlinux
$ target remote /dev/pts/1

REF

– EOF –

Native Linux KVM tool 的使用

LKVM 测试运行

LKVM 网络功能的使用

TUN/TAP 相关概念

LKVM kgdb 内核调试

REF

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