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

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Message-ID: <CAAHg+HiHKV+8hBT1QWe4hSxocCX6wpRd3bCPWB7zU8jVFmPuAA@mail.gmail.com>
Date:	Thu, 18 Apr 2013 13:02:40 +0530
From:	Pranavkumar Sawargaonkar <pranavkumar@...aro.org>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	"kvmarm@...ts.cs.columbia.edu" <kvmarm@...ts.cs.columbia.edu>,
	linux-arm-kernel@...ts.infradead.org,
	linaro-kernel@...ts.linaro.org, patches@...aro.org,
	linux-kernel@...r.kernel.org, Anup Patel <anup.patel@...aro.org>
Subject: Re: [RFC] arm64: Early printk support for virtio-mmio console devices.

On 18 April 2013 12:21, Rusty Russell <rusty@...tcorp.com.au> wrote:
>
> PranavkumarSawargaonkar <pranavkumar@...aro.org> writes:
> > From: Pranavkumar Sawargaonkar <pranavkumar@...aro.org>
> >
> > This patch implements early printk support for virtio-mmio console devices without using any hypercalls.
>
> This makes some sense, though not sure that early console *read* makes
> much sense.  I can see the PCI version of this being useful as well.

Read can be useful for "mach-virt" which will have only virtio console
as a console device. Then if someone wants to have UEFI or any other
boot-loader emulation, which expects user to input few things, in that
case read might become handy.
>
>
> The spec definition for this will be interesting, because it can be used
> before the device is initialized (something which is generally
> verboten).
>
> Cheers,
> Rusty.

Thanks,
Pranav
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