netdev - Re: [PATCHv5 3/3] vhost_net: a kernel-level virtio server

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Date:	Fri, 25 Sep 2009 10:43:47 +0300
From:	Avi Kivity <avi@...hat.com>
To:	"Ira W. Snyder" <iws@...o.caltech.edu>
CC:	Gregory Haskins <gregory.haskins@...il.com>,
	"Michael S. Tsirkin" <mst@...hat.com>, netdev@...r.kernel.org,
	virtualization@...ts.linux-foundation.org, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, mingo@...e.hu, linux-mm@...ck.org,
	akpm@...ux-foundation.org, hpa@...or.com,
	Rusty Russell <rusty@...tcorp.com.au>, s.hetze@...ux-ag.com,
	alacrityvm-devel@...ts.sourceforge.net
Subject: Re: [PATCHv5 3/3] vhost_net: a kernel-level virtio server

On 09/24/2009 10:27 PM, Ira W. Snyder wrote:
>>> Ira can make ira-bus, and ira-eventfd, etc, etc.
>>>
>>> Each iteration will invariably introduce duplicated parts of the stack.
>>>
>>>        
>> Invariably?  Use libraries (virtio-shmem.ko, libvhost.so).
>>
>>      
> Referencing libraries that don't yet exist doesn't seem like a good
> argument against vbus from my point of view. I'm not speficially
> advocating for vbus; I'm just letting you know how it looks to another
> developer in the trenches.
>    

My argument is that we shouldn't write a new framework instead of fixing 
or extending an existing one.

> If you'd like to see the amount of duplication present, look at the code
> I'm currently working on.

Yes, virtio-phys-guest looks pretty much duplicated.  Looks like it 
should be pretty easy to deduplicate.

>   It mostly works at this point, though I
> haven't finished my userspace, nor figured out how to actually transfer
> data.
>
> The current question I have (just to let you know where I am in
> development) is:
>
> I have the physical address of the remote data, but how do I get it into
> a userspace buffer, so I can pass it to tun?
>    

vhost does guest physical address to host userspace address (it your 
scenario, remote physical to local virtual) using a table of memory 
slots; there's an ioctl that allows userspace to initialize that table.

-- 
Do not meddle in the internals of kernels, for they are subtle and quick to panic.

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