Re: [Qemu-devel] [PATCH v2] Add remove_boot_device_path() function for hot-unplug device

["Michael S. Tsirkin" <mst@redhat.com>]

On Wed, Apr 16, 2014 at 10:20:57PM +0800, Jun Li wrote:
> Add remove_boot_device_path() function to remove bootindex when hot-unplug
> a device. This patch fixed virtio-blk/virtio-net/scsi-disk/scsi-generic device.
> So it has fixed bug1086603, ref:
> https://bugzilla.redhat.com/show_bug.cgi?id=1086603
> 
> Make some changes based on Andreas's good suggestion.
> 
> Signed-off-by: Jun Li <junmuzi@gmail.com>
> ---
>  hw/block/virtio-blk.c   |  1 +
>  hw/net/virtio-net.c     |  1 +
>  hw/scsi/scsi-disk.c     |  6 ++++--
>  hw/scsi/scsi-generic.c  |  3 +++
>  include/sysemu/sysemu.h |  2 ++
>  vl.c                    | 16 ++++++++++++++++
>  6 files changed, 27 insertions(+), 2 deletions(-)
> 
> diff --git a/hw/block/virtio-blk.c b/hw/block/virtio-blk.c
> index 8a568e5..ecdd266 100644
> --- a/hw/block/virtio-blk.c
> +++ b/hw/block/virtio-blk.c
> @@ -752,6 +752,7 @@ static void virtio_blk_device_unrealize(DeviceState *dev, Error **errp)
>      unregister_savevm(dev, "virtio-blk", s);
>      blockdev_mark_auto_del(s->bs);
>      virtio_cleanup(vdev);
> +    remove_boot_device_path(s->conf->bootindex, dev, "/disk@0,0");
>  }
>  
>  static Property virtio_blk_properties[] = {
> diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
> index 33bd233..520c029 100644
> --- a/hw/net/virtio-net.c
> +++ b/hw/net/virtio-net.c
> @@ -1633,6 +1633,7 @@ static void virtio_net_device_unrealize(DeviceState *dev, Error **errp)
>      g_free(n->vqs);
>      qemu_del_nic(n->nic);
>      virtio_cleanup(vdev);
> +    remove_boot_device_path(n->nic_conf.bootindex, dev, "/ethernet-phy@0");
>  }
>  
>  static void virtio_net_instance_init(Object *obj)
> diff --git a/hw/scsi/scsi-disk.c b/hw/scsi/scsi-disk.c
> index 48a28ae..bb2176a 100644
> --- a/hw/scsi/scsi-disk.c
> +++ b/hw/scsi/scsi-disk.c
> @@ -2150,12 +2150,14 @@ static void scsi_disk_reset(DeviceState *dev)
>      s->tray_open = 0;
>  }
>  
> -static void scsi_destroy(SCSIDevice *dev)
> +static void scsi_destroy(SCSIDevice *sdev)
>  {
> -    SCSIDiskState *s = DO_UPCAST(SCSIDiskState, qdev, dev);
> +    SCSIDiskState *s = DO_UPCAST(SCSIDiskState, qdev, sdev);
> +    DeviceState *dev = DEVICE(sdev);
>  
>      scsi_device_purge_requests(&s->qdev, SENSE_CODE(NO_SENSE));
>      blockdev_mark_auto_del(s->qdev.conf.bs);
> +    remove_boot_device_path(s->qdev.conf.bootindex, dev, NULL);
>  }
>  
>  static void scsi_disk_resize_cb(void *opaque)
> diff --git a/hw/scsi/scsi-generic.c b/hw/scsi/scsi-generic.c
> index 8d92e0d..2531a44 100644
> --- a/hw/scsi/scsi-generic.c
> +++ b/hw/scsi/scsi-generic.c
> @@ -388,8 +388,11 @@ static void scsi_generic_reset(DeviceState *dev)
>  
>  static void scsi_destroy(SCSIDevice *s)
>  {
> +    DeviceState *dev = DEVICE(s);
> +
>      scsi_device_purge_requests(s, SENSE_CODE(NO_SENSE));
>      blockdev_mark_auto_del(s->conf.bs);
> +    remove_boot_device_path(s->conf.bootindex, dev, NULL);
>  }
>  
>  static int scsi_generic_initfn(SCSIDevice *s)
> diff --git a/include/sysemu/sysemu.h b/include/sysemu/sysemu.h
> index ba5c7f8..f7ad1e2 100644
> --- a/include/sysemu/sysemu.h
> +++ b/include/sysemu/sysemu.h
> @@ -193,6 +193,8 @@ void rtc_change_mon_event(struct tm *tm);
>  
>  void add_boot_device_path(int32_t bootindex, DeviceState *dev,
>                            const char *suffix);
> +void remove_boot_device_path(int32_t bootindex, DeviceState *dev,
> +                             const char *suffix);
>  char *get_boot_devices_list(size_t *size, bool ignore_suffixes);
>  
>  DeviceState *get_boot_device(uint32_t position);
> diff --git a/vl.c b/vl.c
> index 9975e5a..1713c68 100644
> --- a/vl.c
> +++ b/vl.c
> @@ -1184,6 +1184,22 @@ void add_boot_device_path(int32_t bootindex, DeviceState *dev,
>      QTAILQ_INSERT_TAIL(&fw_boot_order, node, link);
>  }
>  
> +void remove_boot_device_path(int32_t bootindex, DeviceState *dev,
> +                             const char *suffix)

Why do we need suffix here?
It seems unused.

> +{
> +    FWBootEntry *node, *next_node;
> +
> +    if (bootindex == -1) {
> +        return;
> +    }
> +
> +    QTAILQ_FOREACH_SAFE(node, &fw_boot_order, link, next_node)
> +        if (node->bootindex == bootindex) {
> +            QTAILQ_REMOVE(&fw_boot_order, node, link);
> +            return;
> +        }
> +}
> +
>  DeviceState *get_boot_device(uint32_t position)
>  {
>      uint32_t counter = 0;
> -- 
> 1.8.3.1
>