linux-kernel - Re: [PATCH] virtio_console: Add support for multiple ports for generic guest and host communication

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Message-ID: <20090919070111.GA5582@amit-x200.redhat.com>
Date:	Sat, 19 Sep 2009 12:31:11 +0530
From:	Amit Shah <amit.shah@...hat.com>
To:	Anthony Liguori <anthony@...emonkey.ws>
Cc:	Alan Cox <alan@...ux.intel.com>, rusty@...tcorp.com.au,
	virtualization@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] virtio_console: Add support for multiple ports for
	generic guest and host communication

On (Fri) Sep 18 2009 [12:55:20], Anthony Liguori wrote:
>> So you need a tiny kernel side driver to unpack it into a meaningful
>> fs, or just a user-user channel with a daemon each end and a protocol
>> over it - nothing kernel in that.
>>   
>
> I think there's some confusion over what this driver actually is.
>
> From my perspective, this is a paravirtual serial device and nothing  
> more.  All the discussion of things like guest copy/paste support is a  
> bit silly.  This is the wrong way to approach that sort of thing because  
> it's not something that belongs in the kernel at all.  Furthermore, the  
> current proposal doesn't handle anything like save/restore which is  
> needed for live migration.

You're mistaken. If you see the patches, I'm only providing a transport
in the kernel. No intelligence in the kernel as to what kind of data
actually flows through. The save/restore support has to come from
userspace, in this case qemu. And that support is very much present.

		Amit
-- 
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