On Mon, Apr 01, 2013 at 04:20:33PM +0800, Liu Ping Fan wrote: > From: Liu Ping Fan <pingf...@linux.vnet.ibm.com> > > virtio-blk will reference to RAM's memoryRegion when the req has been > done. So we can avoid to call bdrv_drain_all() when RAM hot unplug.
How does the hot unplug operation work without bdrv_drain_all()? In other words, how do we safely remove a MemoryRegion and wait for it to become unreferenced? Stefan
