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Re: [Qemu-devel] [RFC PATCH v3 05/19] Implement dimm device abstraction
From: |
Avi Kivity |
Subject: |
Re: [Qemu-devel] [RFC PATCH v3 05/19] Implement dimm device abstraction |
Date: |
Wed, 31 Oct 2012 14:34:02 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:16.0) Gecko/20121016 Thunderbird/16.0.1 |
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.
--
error compiling committee.c: too many arguments to function