From: Arnd Bergmann <arnd@arndb.de>
To: linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v6 00/18] ARM: Add support for the Large Physical Address Extensions
Date: Wed, 25 May 2011 13:10:39 +0200
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Cc: Nicolas Pitre <nico@fluxnic.net>, David Brown <davidb@codeaurora.org>,
        Catalin Marinas <catalin.marinas@arm.com>,
        "Russell King - ARM Linux" <linux@arm.linux.org.uk>,
        linux-kernel@vger.kernel.org
References: <1306273164-18217-1-git-send-email-catalin.marinas@arm.com> <8yapqn7fyab.fsf@huya.qualcomm.com> <alpine.LFD.2.00.1105242042340.3207@xanadu.home>
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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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