Add device driver (uio_ivshmem.ko) on guest

1 start guest 

sudo /etc/init.d/networking restartsudo qemu-system-x86_64 -m 1204 -hda /home/xzl/virtual_machine/ubuntu-12.04-amd64-test.img -localtime -net nic,vlan=0,macaddr=52-54-00-12-34-2,model=virtio -net tap,vlan=0,ifname=tap2,script=no -boot c -smp 2 -chardev socket,path=/tmp/ivshmem_socket,id=foo -device ivshmem,chardev=foo,size=256

2 make and make install driver kernel modules on VM

cd Nahanni/kernel_module/uio/make make install

Makefile for driver kernel modules

# obj-m is a list of what kernel modules to build.  The .o and other# objects will be automatically built from the corresponding .c file -# no need to list the source files explicitly.obj-m := uio_ivshmem.o # KDIR is the location of the kernel source.  The current standard is# to link to the associated source tree from the directory containing# the compiled modules.KDIR  := /lib/modules/$(shell uname -r)/build# PWD is the current working directory and the location of our module# source files.PWD   := $(shell pwd)# default is the default make target.  The rule here says to run make# with a working directory of the directory containing the kernel# source and compile only the modules in the PWD (local) directory.default:        $(MAKE) -C $(KDIR) M=$(PWD) modulesinstall:        cp uio_ivshmem.ko /lib/modules/$(shell uname -r)/kernel/drivers/uio/clean:        rm -f *.ko *.o uio_ivshmem.mod.c Module.symvers

make install == "cp uio_ivhshmem.ko /lib/modules/$(shell uname -r)/kernel/driver/uio/"

3 install driver kernel modules 

cd /lib/modules/3.5.0-23-generic/kernel/drivers/uio/sudo insmod uio.kosudo insmod uio_ivshmem.ko

4 verification

 ls /dev/uio*

you will see

/dev/uio0

or

ls /sys/bus/pci/drivers

agpgart-intel  ahci        ata_generic  ehci_hcd  ioapic         ohci_hcd    pata_acpi  pcieport     serial  uhci_hcd     virtio-pci        xhci_hcdagpgart-via    asiliantfb  ata_piix     imsttfb   langwell_gpio  parport_pc  pata_sis   piix4_smbus  tsi721  uio_ivshmem  xen-platform-pcii

you can find uio_ivshmem in /sys/pci/drivers

or

ls /sys/bus/pci/devices/0000\:00\:04.0/driver/module/drivers/

you also can find uio_ivshmem 

pci:uio_ivshmem

0000:00:04.0 is the busID of ivshmem device

you can fetch the busID through "lspci"

5 problems

It is failed to load the uio_ivshmem driver modules at boot time when I edit the /etc/modules adding lines uio and uio_ivshmem

I can't figure out the reason.