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 <h...@lst.de> Index: qemu/hw/virtio-blk.c =================================================================== --- qemu.orig/hw/virtio-blk.c 2011-01-20 10:32:50.455032625 +0100 +++ qemu/hw/virtio-blk.c 2011-01-24 11:56:42.833004269 +0100 @@ -504,6 +504,15 @@ static int virtio_blk_load(QEMUFile *f, 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) { VirtIOBlock *s; @@ -546,6 +555,7 @@ VirtIODevice *virtio_blk_init(DeviceStat register_savevm(dev, "virtio-blk", virtio_blk_id++, 2, virtio_blk_save, virtio_blk_load, s); 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; add_boot_device_path(conf->bootindex, dev, "/disk@0,0");