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[Qemu-devel] [PATCH 3/3] virtio-blk: tell the guest about size changes
From: |
Christoph Hellwig |
Subject: |
[Qemu-devel] [PATCH 3/3] virtio-blk: tell the guest about size changes |
Date: |
Wed, 19 Jan 2011 18:03:05 +0100 |
User-agent: |
Mutt/1.3.28i |
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 <address@hidden>
Index: qemu/hw/virtio-blk.c
===================================================================
--- qemu.orig/hw/virtio-blk.c 2011-01-19 17:47:10.335004828 +0100
+++ qemu/hw/virtio-blk.c 2011-01-19 17:50:10.748272881 +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, "/address@hidden,0");