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 for Android: free password hash cracker in your pocket

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

Message-ID: <217a4f2dd017af16204391012751e9f9@localhost>
Date:	Thu, 18 Apr 2013 17:59:43 +0200
From:	Marc Zyngier <marc.zyngier@....com>
To:	Christopher Covington <cov@...eaurora.org>
Cc:	PranavkumarSawargaonkar <pranavkumar@...aro.org>,
	<linaro-kernel@...ts.linaro.org>,
	Anup Patel <anup.patel@...aro.org>, <patches@...aro.org>,
	<rusty@...tcorp.com.au>, <linux-kernel@...r.kernel.org>,
	<kvmarm@...ts.cs.columbia.edu>,
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [RFC] arm64: Early printk support for virtio-mmio console devices.

On Thu, 18 Apr 2013 11:25:56 -0400, Christopher Covington
<cov@...eaurora.org> wrote:
> Hi Pranavkumar,
> 
> On 04/18/2013 01:52 AM, PranavkumarSawargaonkar wrote:
>> From: Pranavkumar Sawargaonkar <pranavkumar@...aro.org>
>> 
>> This patch implements early printk support for virtio-mmio console
>> devices
>> without using any hypercalls.
> 
> Is it possible that using DCC might be an easier solution?

You would end up with the exact same problem as with a hypercall based
solution: once you're in the hypervisor, what do you do with the data? You
end up having to invent another channel to forward it down to your platform
emulation in order to have it printed where the user expects it.

Using a MMIO based solution is probably the best solution, as it uses the
existing infrastructure.

        M.
-- 
Fast, cheap, reliable. Pick two.
--
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/