Re: Booting Android with KVM-ARM kernel on QEMU

[Howard Mao <zhehao.mao@xxxxxxxxx>]

I have VFP support enabled in the kernel config already. I will try using Alexander's kernel and qemu and see if that works. Thanks to both of you for your help.

On Fri, Apr 19, 2013 at 5:36 AM, Marc Zyngier <marc.zyngier@xxxxxxx> wrote:

On 19/04/13 03:33, Howard Mao wrote:
> Christoffer and I are attempting to boot an Android image on a Linux 3.9
> kernel with KVM-ARM enabled in QEMU, but on boot we keep getting a
> kernel panic complaining about an illegal instruction in init.
>
> init (1): undefined instruction: pc=00021a26
> Code: b5070000 46692001 ed3cf7f5 9b004a0d (0a01ed9d)
> Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000004
>
> [<8001fe24>] (unwind_backtrace+0x0/0xf8) from [<803b4a5c>]
> (panic+0x90/0x1e4)
> [<803b4a5c>] (panic+0x90/0x1e4) from [<8002fe3c>] (do_exit+0x848/0x8b0)
> [<8002fe3c>] (do_exit+0x848/0x8b0) from [<80030008>]
> (do_group_exit+0x3c/0xc4)
> [<80030008>] (do_group_exit+0x3c/0xc4) from [<8003a398>]
> (get_signal_to_deliver+0x170/0x56c)
> [<8003a398>] (get_signal_to_deliver+0x170/0x56c) from [<8001c82c>]
> (do_signal+0xf0/0x3fc)
> [<8001c82c>] (do_signal+0xf0/0x3fc) from [<8001ce6c>]
> (do_work_pending+0x68/0xa8)
> [<8001ce6c>] (do_work_pending+0x68/0xa8) from [<80019900>]
> (work_pending+0xc/0x20)
>
> Has anyone seen something like this before when running Android in QEMU?
>
> We are using the kernel
> from https://github.com/columbia/linux-kvm-arm/tree/arndale-kvm-3.9-rc2
> QEMU from https://github.com/columbia/qemu/tree/kvm-arm-virtio
> Android from http://source.android.com/source/downloading.html
>
> This has been tested on an Arndale board with QEMU-KVM and QEMU-TCG and
> on an x86_64 machine with QEMU-TCG. All three platforms give the same error.

This last sentence would imply that something is wrong in your Android
build, and has very little to do with KVM.

If you look at the failing instruction, it disassemble as
        VLDR    s0, [sp, #4]

My guess is that your guest kernel doesn't have VFP support enabled,
hence trapping on an UNDEF.

        M.
--
Jazz is not dead. It just smells funny...

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