Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753290Ab3EAFbo (ORCPT ); Wed, 1 May 2013 01:31:44 -0400 Received: from ozlabs.org ([203.10.76.45]:54671 "EHLO ozlabs.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753088Ab3EAFbf (ORCPT ); Wed, 1 May 2013 01:31:35 -0400 From: Rusty Russell To: Alexander Graf , Pranavkumar Sawargaonkar Cc: "linux-arm-kernel\@lists.infradead.org" , "linaro-kernel\@lists.linaro.org" , "patches\@linaro.org" , "linux-kernel\@vger.kernel.org List" , "kvmarm\@lists.cs.columbia.edu" , Peter Maydell Subject: Re: [PATCH 0/2] Early printk support for virtio console devices. In-Reply-To: References: <1366974299-17877-1-git-send-email-pranavkumar@linaro.org> <87obcyc9sh.fsf@rustcorp.com.au> <336C59AA-D5D7-472E-A8DA-EEB413DD6C68@suse.de> User-Agent: Notmuch/0.15.2+81~gd2c8818 (http://notmuchmail.org) Emacs/23.4.1 (i686-pc-linux-gnu) Date: Wed, 01 May 2013 11:37:36 +0930 Message-ID: <87sj27xxjr.fsf@rustcorp.com.au> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1152 Lines: 31 Alexander Graf writes: > There are not device specific registers in > virtio-console. Virtio-console lives behind a virtio bus which doesn't > know what these registers are. You're not going to make coherent arguments without reading that actual patch we're discussing. And you're going to just waste everyone else's time. > Even if you shove it into config space, Which is what the patch does... > it'd be broken because config access happens without intercepts on > some platforms. But people keep assuming it, which is one reason virtio_ccw switched from passive lguest-style config to active. Only lguest and the old kvm virtio use it, and lguest can change. An emergency output is a reasonable idea, and this is a reasonable implementation. The question is practical: will it be used? Because we don't implement reasonable ideas which aren't going to be used. Cheers, Rusty. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/