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

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Message-ID: <CAFEAcA-38=zx-s3NaBAu-yvDNRbt=KcTs-3c1QJR3COB3G1n2A@mail.gmail.com>
Date:	Thu, 18 Apr 2013 09:30:52 +0100
From:	Peter Maydell <peter.maydell@...aro.org>
To:	Marc Zyngier <maz@...terjones.org>
Cc:	PranavkumarSawargaonkar <pranavkumar@...aro.org>,
	linaro-kernel@...ts.linaro.org, patches@...aro.org,
	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 18 April 2013 07:49, Marc Zyngier <maz@...terjones.org> wrote:
> If you need an early console, why not simply wire the 8250 emulation in
> kvmtool to be useable from the MMIO bus? I reckon this would solve your
> problem in a more elegant way...

The other approach I thought of would be something involving
defining a hypercall interface for console I/O, in the same
way that we have hypercalls for "start cpu"/"stop cpu"/etc.
Is there any mileage in considering that approach, or is it
a non-starter?

thanks
-- PMM
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