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From: Arnd Bergmann <arnd@arndb.de>
Date: Wed, 12 Nov 2014 14:08:11 +0100
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Subject: Re: [Qemu-devel] [Linaro-acpi] [RFC PATCH 0/7] hw/arm/virt: Dynamic
	ACPI v5.1 table generation
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To: Paolo Bonzini <pbonzini@redhat.com>
Cc: Mark Rutland <mark.rutland@arm.com>, Peter Maydell <peter.maydell@linaro.org>, "linaro-acpi@lists.linaro.org" <linaro-acpi@lists.linaro.org>, Paul Mundt <Paul.Mundt@huawei.com>, Claudio Fontana <claudio.fontana@huawei.com>, QEMU Developers <qemu-devel@nongnu.org>, Jani Kokkonen <Jani.Kokkonen@huawei.com>, "tech@virtualopensystems.com" <tech@virtualopensystems.com>, Christoffer Dall <christoffer.dall@linaro.org>

On Wednesday 12 November 2014 13:27:14 Paolo Bonzini wrote:
> On 12/11/2014 13:18, Mark Rutland wrote:
> > On Wed, Nov 12, 2014 at 11:48:27AM +0000, Paolo Bonzini wrote:
> >> Perhaps you could treat it as a shared level-triggered interrupt in DT?
> >>  I don't know.
> > 
> > Putting an interrupt in DT is trivial. The hard part is the rest of the
> > interface, which so far there is no specification for.
> 
> Have you looked at docs/specs/acpi_{cpu,mem}_hotplug.txt?  Writing a DT
> binding for it is trivial too.  Or are we talking about two different
> things?

Interesting. I agree that doing a DT binding for these will be trivial,
and the implementation in Linux should also be straightforward, thanks
for pointing these out.

However, it seems that the implementation that qemu uses is incompatible
with ARM64, since GPE is not part of the ACPI hardware reduced mode.

	Arnd