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From: Pavel Fedin <p.fedin@samsung.com>
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Date: Wed, 02 Dec 2015 12:39:32 +0300
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Subject: Re: [Qemu-devel] [Qemu-arm] [PATCH v3 1/8] hw/arm/virt: Add a
	GPIO	controller
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To: 'Wei Huang' <wei@redhat.com>, 'Peter Maydell' <peter.maydell@linaro.org>, 'Igor Mammedov' <imammedo@redhat.com>
Cc: 'G Gregory' <graeme.gregory@linaro.org>, "'Michael S. Tsirkin'" <mst@redhat.com>, 'QEMU Developers' <qemu-devel@nongnu.org>, "'Huangpeng (Peter)'" <peter.huangpeng@huawei.com>, 'qemu-arm' <qemu-arm@nongnu.org>, 'Shannon Zhao' <shannon.zhao@linaro.org>, 'Shannon Zhao' <zhaoshenglong@huawei.com>

 Hello!

> PSCI handles the actions initiated from the inside of OS. Examples
> include system shutdown and hotplug (still inside OS). From this
> perspective PSCI works well. However this communication is
> one-direction: there isn't a way to communicate from the outside (e.g.
> libvirt) to the guest OS. For instance, "system_powerdown" qmp command
> won't work because guest OS can't receive the notification.

 Ah, so it is necessary for e.g. commanding a graceful shutdown using virt-manager's "shutdown" command? Good then, i've missed that.

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