Arm-generic build of chromium OS not working on QEMU

[vineet bajaj]

Hi,

I have been trying to get arm64-llvmpipe to boot on qemu but with no luck. After that i tried x86-generic build of chromiuym os which worked fine. After that i tried arm-generic which again is not working. Doesnt qemu has support for arm architecture. 

I ran the following sequence of Commands

within chroot:

export BOARD=arm-generic

./setup_board --board=${BOARD}

./image_to_vm.sh --board=${BOARD} --test_image

./build_image --board=${BOARD} --noenable_rootfs_verification test

./image_to_vm.sh --board=${BOARD} --test_image

Outside chroot:

./bin/cros_start_vm --image_path=../build/images/${BOARD}/latest/chromiumos_qemu_image.bin

cros_start_vm runs the following command to start the KVM qemu:

INFO    : Launching: /home/mahesh/chromiumos/chroot/usr/bin/qemu-system-x86_64 -enable-kvm -m 2G -smp 4 -vga cirrus -pidfile /tmp/kvm.17296.pid -chardev pipe,id=control_pipe,path=/tmp/kvm.17296.monitor -serial file:/tmp/kvm.17296.serial -mon chardev=control_pipe -daemonize -net nic,model=virtio -net user,hostfwd=tcp:127.0.0.1:9222-:22 -drive file=../build/images/arm-generic/latest/chromiumos_qemu_image.bin,index=0,media=disk,cache=unsafe

Above is the exact same command that is run for x86-generic. Do we need to specify somewhere the type of build flavour?

Any help is greatly appreciated.

Thanks,

Vineet

[Nathan]

Have you tried running the qemu command manually but using qemu-system-arm instead?

Nathan

[Mike Frysinger]

currently you have to specify the qemu-system-xxx binary to use via the --qemu_binary flag to cros_start_vm

-mike

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[vineet bajaj]

Hi,

I tried the following command 
/bin/cros_start_vm --image_path=../build/images/${BOARD}/latest/chromiumos_qemu_image.bin --qemu_binary=/home/mahesh/chromiumos/chroot/usr/bin/qemu-system-arm

But, with this i am getting following error: 


"Starting a KVM instance
INFO    : Launching: /home/mahesh/chromiumos/chroot/usr/bin/qemu-system-arm -m 2G -smp 4 -vga cirrus -pidfile /tmp/kvm.32229.pid -chardev pipe,id=control_pipe,path=/tmp/kvm.32229.monitor -serial file:/tmp/kvm.32229.serial -mon chardev=control_pipe -daemonize -net nic,model=virtio -net user,hostfwd=tcp:127.0.0.1:9222-:22 -drive file=../build/images/arm-generic/latest/chromiumos_qemu_image.bin,index=0,media=disk,cache=unsafe
qemu-system-arm: No machine specified, and there is no default
Use -machine help to list supported machines"

Then i tried with the qemu_system_arm binary directly with -machine virt. The full command was following: 

/home/mahesh/chromiumos/chroot/usr/bin/qemu-system-arm -m 2G -machine virt -smp 4 -vga cirrus -pidfile /tmp/kvm.32229.pid -chardev pipe,id=control_pipe,path=/tmp/kvm.32229.monitor -serial file:/tmp/kvm.32229.serial -mon chardev=control_pipe -daemonize -net nic,model=virtio -net user,hostfwd=tcp:127.0.0.1:9222-:22 -drive file=../build/images/arm-generic/latest/chromiumos_qemu_image.bin,index=0,media=disk,cache=unsafe

Even with the above command i got following error: 
qemu-system-arm: -chardev pipe,id=control_pipe,path=/tmp/kvm.32229.monitor: Could not open '/tmp/kvm.32229.monitor': No such file or directory

Any pointers that i can try?

Regards,

Vineet

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[vineet bajaj]

Hi Mike and Nathan,

Anything that I can give a try. A bit stumped here.

Regards,

Vineet

[Nathan]

Hi Vineet,

You can just remove the -chardev, -serial, and -monitor command line flags if you don't intend to use that functionality.

If you do, you can type 'mkfifo /tmp/kvm.monitor' and then use that file as the parameter to -chardev (32229 is the pid of your particular KVM instance and allows you to run multiple QEMU sessions in parallel; it's not some magic number).

Cheers,

Nathan

[vineet bajaj]

Hi,

I have removed all the above command line flags. After that I am getting following error: 

"kvm" accelerator not found.

No accelerator found!

I used the following command: 

mahesh@mahesh-chrome:~/chromiumos/src/scripts$ /home/mahesh/chromiumos/chroot/usr/bin/qemu-system-arm -machine virt -enable-kvm -m 2G -smp 4 -vga cirrus -pidfile /tmp/kvm.3666.pid -daemonize -net nic,model=virtio -net user,hostfwd=tcp:127.0.0.1:9222-:22 -drive file=../build/images/x86-generic/latest/chromiumos_qemu_image.bin,index=0,media=disk,cache=unsafe

The following command worked for x86-generic board::

/home/mahesh/chromiumos/chroot/usr/bin/qemu-system-x86_64 -enable-kvm -m 2G -smp 4 -vga cirrus -pidfile /tmp/kvm.3666.pid -daemonize -net nic,model=virtio -net user,hostfwd=tcp:127.0.0.1:9222-:22 -drive file=../build/images/x86-generic/latest/chromiumos_qemu_image.bin,index=0,media=disk,cache=unsafe

If i Use the same command line flags for qemu-system-arm then it throws up error as no default machine specified. So i added one extra flag in qemu-system-arm command which is  -machine virt. After this it throws up the above mentioned error of "kvm" accelerator not found.

Regards,

Vineet

[Mike Frysinger]

-enable-kvm only works when using a target that matches the host cpu.  i.e. if you're running on an x86_64 desktop, it only works with qemu-system-x86_64.  so drop the flag.

-mike

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