linux-kernel - Re: [PATCH v2 3/4] arm64: dts: Add mediatek MT8173 SoC and evaluation board dts and Makefile

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Message-ID: <5497DF4C.4000104@arm.com>
Date:	Mon, 22 Dec 2014 09:07:24 +0000
From:	Marc Zyngier <marc.zyngier@....com>
To:	Arnd Bergmann <arnd@...db.de>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
CC:	Mark Rutland <Mark.Rutland@....com>,
	Eddie Huang <eddie.huang@...iatek.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Jason Cooper <jason@...edaemon.net>,
	Pawel Moll <Pawel.Moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Catalin Marinas <Catalin.Marinas@....com>,
	Olof Johansson <olof@...om.net>,
	Will Deacon <Will.Deacon@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Robert Richter <rrichter@...ium.com>,
	"srv_heupstream@...iatek.com" <srv_heupstream@...iatek.com>,
	Rob Herring <robh+dt@...nel.org>,
	Sascha Hauer <kernel@...gutronix.de>,
	Kumar Gala <galak@...eaurora.org>,
	Matthias Brugger <matthias.bgg@...il.com>,
	"Joe.C" <yingjoe.chen@...iatek.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Mark Brown <broonie@...aro.org>
Subject: Re: [PATCH v2 3/4] arm64: dts: Add mediatek MT8173 SoC and evaluation
 board dts and Makefile

On 20/12/14 20:07, Arnd Bergmann wrote:
> On Wednesday 17 December 2014 15:01:29 Marc Zyngier wrote:
>>
>> Indeed, as described in the documentation:
>> http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0471b/CHDIFAEE.html
>>
>> Also it is worth noticing that given how GICV is placed, it will never
>> work with 64K pages and virtualization. Pretty sad.
> 
> Does this mean no VGIC support on this platform so you have to emulate it
> in order to run virtual machines with 64K pages, or does it mean that
> it's impossible to use that way because you can't emulate it?

As Peter said, this is not a configuration we're willing to support:
- we don't have a API to tell userspace emulation about interrupts
generated by the generic timers
- we could move the whole GIC emulation into the kernel (at the moment,
only the distributor is there), but that would be a complete nightmare

It really looks like a case of "let's drop a bunch of 64bit cores into
an existing SoC". Shame people can't read integration guidelines...

	M.
-- 
Jazz is not dead. It just smells funny...
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