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

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Message-ID: <20090918170048.53ba8cf6@linux.intel.com>
Date:	Fri, 18 Sep 2009 17:00:48 +0100
From:	Alan Cox <alan@...ux.intel.com>
To:	Anthony Liguori <anthony@...emonkey.ws>
Cc:	Amit Shah <amit.shah@...hat.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

> We do actually want hangup and a few other of the tty specific ops.
> The only thing we really don't want is a baud rate.

So you need break, parity ... no be serious please

> This device cannot be implemented as-is in userspace because it
> depends on DMA which precludes the use of something like uio_pci.  We
> could modify the device to avoid dma if the feeling was that there
> was no interest in putting this in the kernel.

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.

We don't implement tcp/ip http sessions as tty devices with the kernel
as web server and the same logic applies here.
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