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virtio-blk: tell the guest about size changes

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Raise a config change interrupt when the size changed.  This allows
virtio-blk guest drivers to read-read the information from the
config space once it got the config chaged interrupt.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Christoph Hellwig 2011-01-24 13:32:51 +01:00 committed by Kevin Wolf
parent db97ee6a97
commit e5051fc708
1 changed files with 10 additions and 0 deletions
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10
hw/virtio-blk.c
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@ -514,6 +514,15 @@ static int virtio_blk_load(QEMUFile *f, void *opaque, int version_id)
return 0; return 0;
} }
static void virtio_blk_change_cb(void *opaque, int reason)
{
VirtIOBlock *s = opaque;
if (reason & CHANGE_SIZE) {
virtio_notify_config(&s->vdev);
}
}
VirtIODevice *virtio_blk_init(DeviceState *dev, BlockConf *conf) VirtIODevice *virtio_blk_init(DeviceState *dev, BlockConf *conf)
{ {
VirtIOBlock *s; VirtIOBlock *s;
@ -556,6 +565,7 @@ VirtIODevice *virtio_blk_init(DeviceState *dev, BlockConf *conf)
register_savevm(dev, "virtio-blk", virtio_blk_id++, 2, register_savevm(dev, "virtio-blk", virtio_blk_id++, 2,
virtio_blk_save, virtio_blk_load, s); virtio_blk_save, virtio_blk_load, s);
bdrv_set_removable(s->bs, 0); bdrv_set_removable(s->bs, 0);
bdrv_set_change_cb(s->bs, virtio_blk_change_cb, s);
s->bs->buffer_alignment = conf->logical_block_size; s->bs->buffer_alignment = conf->logical_block_size;
add_boot_device_path(conf->bootindex, dev, "/disk@0,0"); add_boot_device_path(conf->bootindex, dev, "/disk@0,0");