linux-kernel - Re: [RFC] arm64: Early printk support for virtio-mmio console devices.

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CAFEAcA-F18kR4JihdxaLTm3qb4n51tsygG1RW4djwJ0u9+FQqw@mail.gmail.com>
Date:	Fri, 19 Apr 2013 17:14:36 +0100
From:	Peter Maydell <peter.maydell@...aro.org>
To:	Catalin Marinas <catalin.marinas@....com>
Cc:	Will Deacon <Will.Deacon@....com>,
	"linaro-kernel@...ts.linaro.org" <linaro-kernel@...ts.linaro.org>,
	Patch Tracking <patches@...aro.org>,
	Marc Zyngier <Marc.Zyngier@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"kvmarm@...ts.cs.columbia.edu" <kvmarm@...ts.cs.columbia.edu>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Pranavkumar Sawargaonkar <pranavkumar@...aro.org>
Subject: Re: [RFC] arm64: Early printk support for virtio-mmio console devices.

On 19 April 2013 17:12, Catalin Marinas <catalin.marinas@....com> wrote:
> On Fri, Apr 19, 2013 at 11:05:47AM +0100, Peter Maydell wrote:
>> Please make the kernel pick the device out of the device tree
>> blob. The whole point of device tree is that it's how to tell
>> the kernel where things live -- making kvmtool/QEMU and/or the
>> user also have to mess with the kernel command line is awkward
>> and annoying.
>
> For a normal console device, it indeed needs to get it from the DT. For
> early console, you want it earlier than DT parsing so we pass it on the
> kernel command line via the earlyprintk= parameter.

You should fix your DT handling code so you can get at the info
when you need it rather than pushing the problem into bootloaders
and QEMU, please. DT is your data structure so feel free to
(re)design it so relevant information can be accessed early
if that's useful.

thanks
-- PMM
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/