[libvirt-users] Problems with qemu-system-arm and isa-serial

[Martin Kletzander]

On Mon, Feb 17, 2014 at 05:01:05PM +0100, Niccolo Rigacci wrote:
> Hi,
>
> I'm trying to use libvirt for an armel virtual machine hosted
> into an x86_64 box.
>
> I know the command line to start qemu-system-arm directly, but I
> cannot figure a proper .xml configuration file to let libvirt do
> this job.
>

We're still missing a full support for qemu-system-arm because it has
different options, works differently and so on.

> The main problem is that I want a serial console attached via
> telnet, this is the Qemu incantation:
>
> -serial telnet::4000,server,nowait,nodelay
>

this is an old-style for -chardev serial, I believe

> Wahtever I do in libvirt, I get this paramter added:
>
> -device isa-serial
>

and this is new-style for x86 qemu, however, arm-based qemu haven't
adopted this option yet.

> which causes Qemu to fail:
>
> qemu-system-arm -M versatileab -device isa-serial \
>     -kernel vmlinuz-2.6.32-5-versatile
> qemu-system-arm: -device isa-serial: No 'ISA' bus found for device 'isa-serial'
>
> How can I instead have -device pl011, or just have the default
> devices provided by qemu-system-arm, i.e. to prevent libvirt from
> adding the -nodefaults switch?
>

libvirt adds -nodefault and similar options (and has to add them)
because otherwise there are devices which libvirt doesn't know of and
is thus unable to work properly.  I found one small thing in the code
which might help you, I'll cook-up a patch and will put you in Cc
when sending, can you try compiling it with that patch added (or from
git when pushed) to see whether that will help you?

Have a nice day,
Martin

> Thank you!
>
> --
> Niccolo Rigacci - http://www.rigacci.net/
> Campi Bisenzio - Firenze - Italy
> Tel. Office: +39-055-9331021, Mobile: +39-327-5619352
>
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