linux-kernel - Re: [PATCH v6 00/18] ARM: Add support for the Large Physical Address Extensions

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Message-Id: <201105251310.39609.arnd@arndb.de>
Date:	Wed, 25 May 2011 13:10:39 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	Nicolas Pitre <nico@...xnic.net>,
	David Brown <davidb@...eaurora.org>,
	Catalin Marinas <catalin.marinas@....com>,
	"Russell King - ARM Linux" <linux@....linux.org.uk>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 00/18] ARM: Add support for the Large Physical Address Extensions

On Wednesday 25 May 2011, Nicolas Pitre wrote:
> > Do you expect non LPAE targets to be able to boot with these changes
> > applied (and LPAE enabled)?  I am able to build this tree for the
> > MSM8660 (with a minor patch below), but it fails to boot with LPAE
> > enabled.  It seems to work fine with LPAE not enabled.
> 
> I wouldn't expect a LPAE kernel to boot on non LPAE capable hardware.
> 
> And I don't think we'll ever try to support both LPAE and non-LPAE modes 
> in the same kernel binary either since this has implications all over 
> the place in core kernel mm code.

Just for information and to complete the picture, what other of these
combinations are possible?

* Non-LPAE kernel on LPAE-capable hardware

* LPAE kernel as KVM guest of LPAE kernel

* non-LPAE kernel as KVM guest of LPAE kernel

* LPAE kernel as KVM guest of non-LPAE kernel

* non-LPAE kernel as KVM guest of non-LPAE kernel on LPAE-enabled hardware

	Arnd
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