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From: Pavel Fedin <p.fedin@samsung.com>
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Date: Tue, 01 Dec 2015 17:48:33 +0300
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Subject: Re: [Qemu-devel] [PATCH v3 1/8] hw/arm/virt: Add a GPIO controller
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To: 'Peter Maydell' <peter.maydell@linaro.org>, 'Igor Mammedov' <imammedo@redhat.com>
Cc: 'Wei Huang' <wei@redhat.com>, 'G Gregory' <graeme.gregory@linaro.org>, "'Michael S. Tsirkin'" <mst@redhat.com>, "'Huangpeng (Peter)'" <peter.huangpeng@huawei.com>, 'QEMU Developers' <qemu-devel@nongnu.org>, 'qemu-arm' <qemu-arm@nongnu.org>, 'Shannon Zhao' <shannon.zhao@linaro.org>, 'Shannon Zhao' <zhaoshenglong@huawei.com>

 Hello!

> >> ACPI 5.0 supports GPIO-signaled ACPI Events. This can be used for
> >> powerdown, hotplug evnets. Add a GPIO controller in machine virt,
> > s/evnets/events/
> >
> >> to support powerdown, maybe can be used for cpu hotplug. And
> >> here we use pl061.

 Sorry for late jumping in, but this was the first message Cc'ed to me.
 With these devices virt machine IMHO goes farther and farther away from =
its initial goal: be a minimalistic virtual box, which ensures maximum =
possible compatibility and portability.
 virt machine already supports poweroff using PSCI interface. Why we =
need to add more hardware? Can't ACPI deal with PSCI?
 To tell the truth, i dislike ACPI + EFI thing at all. It looks like =
cramming PC-oriented firmware into architecture for which it was never =
meant to be written. Too much overcomplications, we drop already =
established things and reinvent a (triangular) wheel, but what's the =
purpose? Is it being done only because vendors want obscure proprietary =
firmware instead of old good u-boot?

Kind regards,
Pavel Fedin
Expert Engineer
Samsung Electronics Research center Russia