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[Qemu-ppc] -nodefaults and available buses (was Re: [Qemu-devel] [RFC 00

From: Eduardo Habkost
Subject: [Qemu-ppc] -nodefaults and available buses (was Re: [Qemu-devel] [RFC 00/15] qmp: Report supported device types on 'query-machines')
Date: Wed, 23 Nov 2016 15:10:47 -0200
User-agent: Mutt/1.7.1 (2016-10-04)

(CCing the maintainers of the machines that crash when using

On Tue, Nov 22, 2016 at 08:34:50PM -0200, Eduardo Habkost wrote:
> "default defaults" vs "-nodefault defaults"
> -------------------------------------------
> Two bad news:
> 1) We need to differentiate buses created by the machine with
>    "-nodefaults" and buses that are created only without
>    "-nodefaults".
> libvirt use -nodefaults when starting QEMU, so knowing which
> buses are available when using -nodefaults is more interesting
> for them.
> Other software, on the other hand, might be interested in the
> results without -nodefaults.
> We need to be able model both cases in the new interface.
> Suggestions are welcome.

The good news is that the list is short. The only[1] machines
where the list of buses seem to change when using -nodefaults

* mpc8544ds
* ppce500
* mpc8544ds
* ppce500
* s390-ccw-virtio-*

On all cases above, the only difference is that a virtio bus is
available if not using -nodefaults.

Considering that the list is short, I plan to rename
'supported-device-types' to 'always-available-buses', and
document that it will include only the buses that are not
disabled by -nodefaults.

[1] I mean, the only ones from the set that don't crash with
    -nodefaults. The ones below could not be tested:

> 2) A lot of machine-types won't start if using
>    "-nodefaults -machine <machine>" without any extra devices or
>    drives.
> Lots of machines require some drives or devices to be created
> (especially ARM machines that require a SD drive to be
> available).
> Some machines will make QEMU exit, some of them simply segfault.
> I am looking for ways to work around it so we can still validate
> -nodefaults-based info on the test code.

The following machines won't work with -nodefaults:

These make QEMU segfault:
* cubieboard
* petalogix-ml605
* or32-sim
* virtex-ml507
* Niagara

These exit with a "missing SecureDigital device" error:
* akita
* borzoi
* cheetah
* connex
* mainstone
* n800
* n810
* spitz
* sx1
* sx1-v1
* terrier
* tosa
* verdex
* z2


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