[MirageOS-devel] CT 'xl create' - Loops and Device Model

[Ahmed Ismail <a.m.ismail@xxxxxxxxxxxx>]

Hello,

I hope you're all having a wonderful day.

I was following the tutorial on openmirage, specifically at [1], when I faced a few problems at the Linux DomU part.Â

The only differences between the tutorial and how I went about it is in my choice for some variables i.e. hostname, ssh settings, etc.Â

1- Using the "/root/dom0_kernel" zImage, running xl create causes it to enter an endless loop. All I get back is:

```

mirage@cubietruck:/media/disk$ sudo xl create domU_test -c

Parsing config from domU_test

```

'sudo xl list' shows that the guest is in a paused state.Â

Unpausing it, the guest enters a sort of limbo (no state present, just dashes).

```

mirage@cubietruck:/media/disk$ sudo xl unpause Ubuntu-14.04

mirage@cubietruck:/media/disk$ sudo xl list

Name                    ÂID  Mem VCPUs State Time(s)

(null) Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 0 Â 512 Â Â 2 Â Â r----- Â 18273.1

Ubuntu-14.04 Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â21 Â 512 Â Â 2 Â Â ------ Â Â Â 4.4

```

2- Compiling the linux kernel seperately using gcc-4.9 on the CT, and changing the cfg file to use the zImage kernel instead I get the following error:

```

mirage@cubietruck:/media/disk$ sudo xl create -c XenGuest2.cfg

Parsing config from XenGuest2.cfg

libxl: error: libxl_dm.c:1388:device_model_spawn_outcome: domain 5 device model: spawn failed (rc=-3)

libxl: error: libxl_create.c:1186:domcreate_devmodel_started: device model did not start: -3

libxl: error: libxl_dm.c:1492:kill_device_model: Device Model already exited

```

Currently, my cfg file looks like this:

```

device_model_version = "qemu-xen"

device_model_override = "/usr/bin/qemu-arm-static"

kernel = "/media/disk/zImage"

memory = 512

name = "Test"

vcpus = 2

serial="pty"

disk = [ 'phy:/media/disk/XenGuest2.img,xvda1,w', 'phy:/media/disk/XenGuest2.swap,xvda2,w']

vif = ['bridge=xenbr0']

root = "/dev/xvda1 ro"

#extra = 'console=hvc0 xencons=tty root=/dev/xvda1'

```

But I've messed with it quite a bit, changing the device_model_override value, disk and root/extra options.

Has anyone successfully created Xen guests on the cubietruck?

Care to share how you went about getting it to work?

Note: The unikernels work fine.

Thanks in advance.

--

Ahmed

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