Re: qemu fail to parse command line with "-pcidevice 00:19.0"

[Markus Armbruster <armbru@redhat.com>]

Note to qemu-devel: this issue is qemu-kvm only.

"Hao, Xudong" <xudong.hao@intel.com> writes:

> When assign one PCI device, qemu fail to parse the command line:
> qemu-system_x86 -smp 2 -m 1024 -hda /path/to/img -pcidevice host=00:19.0
> Error:
> qemu-system-x86_64: Parameter 'id' expects an identifier
> Identifiers consist of letters, digits, '-', '.', '_', starting with a letter.
> pcidevice argument parse error; please check the help text for usage
> Could not add assigned device host=00:19.0
>
> https://bugs.launchpad.net/qemu/+bug/597932
>
> This issue caused by qemu-kvm commit b560a9ab9be06afcbb78b3791ab836dad208a239.

The bug is in add_assigned_device():

    r = get_param_value(id, sizeof(id), "id", arg);
    if (!r)
        r = get_param_value(id, sizeof(id), "name", arg);
    if (!r)
        r = get_param_value(id, sizeof(id), "host", arg);

We end up with invalid ID "00:19.0".

Is there a technical reason why we must have an ID?  I doubt it.

Work-around: -device pci-assign,host=00:19.1

See the last section of docs/qdev-device-use.txt for details.