[Qemu-devel] Device initialisation problem:

[Ian Molton]

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Hi,

I'm trying to use the qption parser to parse my device option string,
which is formatted like this:

- -vrng dev=/dev/foo,rate=10K

and I mostly got things to work by using this, in vl.c:

static int virtio_rng_parse(const char *arg)
{
        QemuOpts *opts;

    if (strcmp(arg, "none") == 0) {
        return 0;
    }
    if (!strncmp(arg, "dev", 3)) {
        /* have params -> parse them */
        opts = qemu_opts_parse(&qemu_device_opts, arg, NULL);
        if (!opts)
            return  -1;
    } else {
        /* create empty opts */
        opts = qemu_opts_create(&qemu_device_opts, NULL, 0);
    }

    qemu_opt_set(opts, "driver", "virtio-rng-pci");

    return 0;
}

However when I tried to create my own opts layout so that I could take
advantage of the OPT_SIZE  option type, I ran into problems.

I defined the following:

QemuOptsList qemu_rng_opts = {
    .name = "virtio-rng-pci",
    .head = QTAILQ_HEAD_INITIALIZER(qemu_rng_opts.head),
    .desc = {
        {
            .name = "dev",
            .type = QEMU_OPT_STRING,
        },
        {
            .name = "rate",
            .type = QEMU_OPT_SIZE,
        },
        { /* end if list */ }
    }
};

And modified the code in vl.c to read:

static int virtio_rng_parse(const char *arg)
{
        QemuOpts *opts;

    if (strcmp(arg, "none") == 0) {
        return 0;
    }
    if (!strncmp(arg, "dev", 3)) {
        /* have params -> parse them */
        opts = qemu_opts_parse(&qemu_rng_opts, arg, NULL);
        if (!opts)
            return  -1;
    } else {
        /* create empty opts */
        opts = qemu_opts_create(&qemu_rng_opts, NULL, 0);
    }

//    qemu_opt_set(opts, "driver", "virtio-rng-pci");

    return 0;
}

But now my driver does not get registered.

So it seems I can use &qemu_device_opts and forego the nice parsing, or
I can get nice parsing and not have a device.

What am I missing here ?

- -Ian
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