Re: [Qemu-devel] [PATCH 4/5] Add generic drive hotplugging

[Anthony Liguori <anthony@codemonkey.ws>]

On 08/23/2010 05:02 PM, Alexander Graf wrote:
> The monitor command for hotplugging is in i386 specific code. This is just
> plain wrong, as S390 just learned how to do hotplugging too and needs to
> get drives for that.
>
> So let's add a generic copy to generic code that handles drive_add in a
> way that doesn't have pci dependencies.
>
> I'm not fully happy with the patch as is. IMHO there should only be a
> single target agnostic drive_hot_add function available. How we could
> potentially fit IF_SCSI in there I don't know though.
>
> Signed-off-by: Alexander Graf<agraf@suse.de>
>    

I think you really want device_add plus a blockdev_add.

Regards,

Anthony Liguori

> ---
>   hw/device-hotplug.c |   43 +++++++++++++++++++++++++++++++++++++++++++
>   1 files changed, 43 insertions(+), 0 deletions(-)
>
> diff --git a/hw/device-hotplug.c b/hw/device-hotplug.c
> index c1a9a56..f311c7f 100644
> --- a/hw/device-hotplug.c
> +++ b/hw/device-hotplug.c
> @@ -25,6 +25,9 @@
>   #include "hw.h"
>   #include "boards.h"
>   #include "net.h"
> +#include "qemu-config.h"
> +#include "sysemu.h"
> +#include "monitor.h"
>
>   DriveInfo *add_init_drive(const char *optstr)
>   {
> @@ -44,3 +47,43 @@ DriveInfo *add_init_drive(const char *optstr)
>
>       return dinfo;
>   }
> +
> +#if !defined(TARGET_I386)
> +
> +/*
> + * This version of drive_hot_add does not know anything about PCI specifics.
> + * It is used as fallback on architectures that don't implement pci-hotplug.
> + */
> +void drive_hot_add(Monitor *mon, const QDict *qdict)
> +{
> +    int type;
> +    DriveInfo *dinfo = NULL;
> +    const char *opts = qdict_get_str(qdict, "opts");
> +
> +    dinfo = add_init_drive(opts);
> +    if (!dinfo)
> +        goto err;
> +    if (dinfo->devaddr) {
> +        monitor_printf(mon, "Parameter addr not supported\n");
> +        goto err;
> +    }
> +    type = dinfo->type;
> +
> +    switch (type) {
> +    case IF_NONE:
> +        monitor_printf(mon, "OK\n");
> +        break;
> +    default:
> +        monitor_printf(mon, "Can't hot-add drive to type %d\n", type);
> +        goto err;
> +    }
> +    return;
> +
> +err:
> +    if (dinfo)
> +        drive_uninit(dinfo);
> +    return;
> +}
> +
> +#endif /* !defined(TARGET_I386) */
> +
>