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

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Message-ID: <b67c5c681ce96942c3cc3bd05b8c80d2@localhost>
Date:	Thu, 18 Apr 2013 10:51:43 +0200
From:	Marc Zyngier <marc.zyngier@....com>
To:	Peter Maydell <peter.maydell@...aro.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 Thu, 18 Apr 2013 09:30:52 +0100, Peter Maydell
<peter.maydell@...aro.org> wrote:
> 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?

That's always possible, but that becomes architecture dependent, which
means code duplication across architectures. I'd rather use the MMIO
infrastructure, which has some commonalities across the board.

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