[SeaBIOS] [Qemu-devel] [RFC PATCH v3 05/19] Implement dimm device abstraction

Stefan Hajnoczi stefanha at gmail.com
Wed Oct 31 13:34:49 CET 2012

On Wed, Oct 31, 2012 at 1:34 PM, Avi Kivity <avi at redhat.com> wrote:
> On 10/31/2012 02:18 PM, Stefan Hajnoczi wrote:
>>> IMO we should use the same mechanism as proposed for other devices:
>>> address_space_map() should grab a reference on the dimm device, and
>>> address_space_unmap() can release it.  This way device destruction will
>>> be deferred as soon as all devices complete I/O.
>>> We will have to be careful with network receive buffers though, since
>>> they can be held indefinitely.
>> Network receive buffers aren't mapped.  Net receive is not zero-copy.
>> For example, virtio-net does virtqueue_pop() inside
>> virtio_net_receive().
>> I don't see a problem with networking.
> What about vhost-net?  But that is managed separately with a MemoryListener.

Yep.  It should find out when memory regions change through its listener.


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