On Thursday 13 January 2011 04:23 AM, Alexander Graf wrote:
On 12.01.2011, at 21:51, Dushyant Bansal<cs5070...@cse.iitd.ac.in> wrote:
$ 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 ?
Did you select it as * or M? If it's *, there is no module - everything is in
the kernel and (with proper udev) you should just get /dev/kvm.
Alex
Yes, I am using * for selection. Thanks for the info.
Dushyant
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