Re: error: building kvm for powerpc using cross compiler on x86

[Dushyant Bansal <cs5070214@cse.iitd.ac.in>]

>>> $ cp arch/powerpc/configs/pmac32_defconfig .config
>>> $ make menuconfig ARCH=powerpc
>>>
>>> seems to work. I'm not sure what default config is taken by default, but apparently one of the KVM constraints isn't fulfilled. Since you want to build a kernel for a pmac32 anyways, just take that config as the basis or use the one from a VM you already have working :).
>>>
>>>
>>> Alex
>>>
>>>        
>> I tried to build kernel image for powerpc-750
>> user@user:~/project/kvm$ cp arch/powerpc/configs/pmac32_defconfig .config
>> user@user:~/project/kvm$ make ARCH=powerpc menuconfig
>>
>> [I selected "KVM support for PowerPC book3s_32 processors" under virtualization menu. I have attached the final .config file]
>>
>> user@user:~/project/kvm$ make ARCH=powerpc CROSS_COMPILE=powerpc-750-linux-gnu-
>> [I get this error]
>>    CHK     include/linux/version.h
>>    CHK     include/generated/utsrelease.h
>>    CALL    scripts/checksyscalls.sh
>>    CHK     include/generated/compile.h
>>    CALL    arch/powerpc/kernel/systbl_chk.sh
>>    CALL    arch/powerpc/kernel/prom_init_check.sh
>>    AS      arch/powerpc/kvm/fpu.o
>> arch/powerpc/kvm/fpu.S: Assembler messages:
>> arch/powerpc/kvm/fpu.S:244: Error: Unrecognized opcode: `frsqrtes.'
>> arch/powerpc/kvm/fpu.S:250: Error: Unrecognized opcode: `fre.'
>> arch/powerpc/kvm/fpu.S:259: Error: Unrecognized opcode: `fcpsgn.'
>> make[1]: *** [arch/powerpc/kvm/fpu.o] Error 1
>> make: *** [arch/powerpc/kvm] Error 2
>>      
> This means that your assembler doesn't understand some of the floating point instructions in the paired single emulation code. Since you don't need that code anyways, just comment them out.
>
>    
Thanks a lot, Alex. After debugging some more errors, I was finally able 
to compile it.

user@user:~/kvm$ make distclean
user@user:~/kvm$ cp arch/powerpc/configs/pmac32_defconfig .config
user@user:~/kvm$ make ARCH=powerpc menuconfig
[I selected "KVM support for PowerPC book3s_32 processors" under 
virtualization menu.]
user@user:~/kvm$ make ARCH=powerpc CROSS_COMPILE=powerpc-750-linux-gnu-
user@user:~/kvm$ make ARCH=powerpc CROSS_COMPILE=powerpc-750-linux-gnu- 
modules

Then, I mounted the qemu-system-ppc image "debian_lenny_powerpc.raw".

user@user:/$  losetup /dev/loop0 debian_lenny_powerpc.raw
user@user:/$  kpartx -a /dev/loop0
user@user:/$  mount /dev/mapper/loop0p3 /mnt/image2
user@user:/$  mount /dev/mapper/loop0p2 /mnt/image2/boot/

user@user:~/kvm$ sudo make ARCH=powerpc 
CROSS_COMPILE=powerpc-750-linux-gnu- INSTALL_NOD_PATH="/mnt/image2" 
modules_install

[Replaced /boot/vmlinux with the generated vmlinux]
user@user:~/kvm$ cp vmlinux /mnt/image2/boot/vmlinux

And, on booting that image [debian_lenny_powerpc.raw], I can see the new 
kernel image.

# uname -r
2.6.37-rc6+
But still, I cannot find the kvm module. File kvm.ko is not present 
inside "lib/modules/2.6.37-rc6+/"

# modprobe kvm
FATAL: Module kvm not found.

Am I missing something? How do I build kvm module ?

Thanks,