linux-kernel - [RFC PATCH 0/5] patches for a network-based hvc backend (s390)

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Message-Id: <20081014091247.433079967@linux.vnet.ibm.com>
Date:	Tue, 14 Oct 2008 11:12:47 +0200
From:	Hendrik Brueckner <brueckner@...ux.vnet.ibm.com>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Linux PPC devel <linuxppc-dev@...abs.org>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	"Ryan S. Arnold" <rsa@...ibm.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Christian Borntraeger <borntraeger@...ibm.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Martin Schwidefsky <schwidefsky@...ibm.com>
Subject: [RFC PATCH 0/5] patches for a network-based hvc backend (s390)

Hello,

I work on a network-based hvc console backend for s390 that allows
to get "full-screen" terminal access to z/VM guest machines.
The solution consists of a HVC backend that provides the terminal interface;
and a tool to connect to the terminal via a z/VM specific communication
protocol.

The network-based backend differs in a few aspects from the notifier-based
model of the HVC console; because it has to deal with (dis)connects and must
take care of virtual tty hangups. Therefore, I would like to introduce a third
notifier for hangups (see patch 1).

Further I found out that if put_char() returns 0 in particular cases, the hvc
console starts to loop. I tried to address this problem with patch 3 and I hope
that it will work for all backends.

Finally, I would like to add a function that allows to resize the terminal
window of a HVC terminal (patch 4).

Here is an overview about the complete patch series:
 Patch 1 adds a hangup notifier
 Patch 2 adds tty driver flag TTY_DRIVER_RESET_TERMIOS
 Patch 3 fixes a loop if put_char() returns 0
 Patch 4 adds a function to resize the tty window
 Patch 5 removes __devexit of hvc_remove() for use in __(dev)init sections

Any review feedback would be greatly appreciated.
Thank you in advance.

Regards,
Hendrik
-- 
Hendrik Brueckner
D/3303 Linux on System z Development
Tel: +49 7031 16-1073
Fax: +49 7031 16-3456
eMail: brueckner@...ux.vnet.ibm.com
IBM Deutschland Research & Development GmbH, Schoenaicher Str. 220, 71032 Boeblingen

IBM Deutschland Research & Development GmbH
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