netdev - Re: [PATCH] AF_VMCHANNEL address family for guest<->host communication.

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Message-ID: <494837AF.6090108@redhat.com>
Date:	Wed, 17 Dec 2008 01:20:15 +0200
From:	Dor Laor <dlaor@...hat.com>
To:	Evgeniy Polyakov <zbr@...emap.net>
CC:	Gleb Natapov <gleb@...hat.com>,
	Anthony Liguori <anthony@...emonkey.ws>,
	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	virtualization@...ts.linux-foundation.org, kvm@...r.kernel.org
Subject: Re: [PATCH] AF_VMCHANNEL address family for guest<->host communication.

Evgeniy Polyakov wrote:
> On Tue, Dec 16, 2008 at 08:57:27AM +0200, Gleb Natapov (gleb@...hat.com) wrote:
>   
>>> Another approach is to implement that virtio backend with netlink based
>>> userspace interface (like using connector or genetlink). This does not
>>> differ too much from what you have with special socket family, but at
>>> least it does not duplicate existing functionality of
>>> userspace-kernelspace communications.
>>>
>>>       
>> I implemented vmchannel using connector initially (the downside is that
>> message can be dropped). Is this more expectable for upstream? The
>> implementation was 300 lines of code.
>>     
>
> Hard to tell, it depends on implementation. But if things are good, I
> have no objections as connector maintainer :)
>
> Messages in connector in particular and netlink in general are only
> dropped, when receiving buffer is full (or when there is no memory), you
> can tune buffer size to match virtual queue size or vice versa.
>
>   
Gleb was aware of that and it's not a problem since all of the 
anticipated usages may
drop msgs (guest statistics, cut&paste, mouse movements, single sign on 
commands, etc).
Service that would need reliability could use basic acks.
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