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Re: [Qemu-devel] [PATCH 4/5] virtio-blk: release reference to RAM's memo

From: liu ping fan
Subject: Re: [Qemu-devel] [PATCH 4/5] virtio-blk: release reference to RAM's memoryRegion
Date: Fri, 12 Apr 2013 12:48:12 +0800

On Thu, Apr 11, 2013 at 6:20 PM, Stefan Hajnoczi <address@hidden> wrote:
> On Mon, Apr 01, 2013 at 04:20:33PM +0800, Liu Ping Fan wrote:
>> From: Liu Ping Fan <address@hidden>
>> 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?
bdrv_drain_all() forces the end of usage of memoryRegion. But we can
let the req done callback ( marks this req finish the end of usage of
mr) to release the refcnt of memoryRegion.

> Stefan

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