From: Eric Blake <eblake@redhat.com>
To: Markus Armbruster <armbru@redhat.com>
Cc: "Daniel P. Berrange" <berrange@redhat.com>,
Peter Maydell <peter.maydell@linaro.org>,
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Gerd Hoffmann <kraxel@redhat.com>,
"Edgar E. Iglesias" <edgar.iglesias@gmail.com>,
Rob Herring <robh@kernel.org>,
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Subject: Re: [Qemu-devel] [PATCH v2] event: Add source information to SHUTDOWN
Date: Thu, 20 Apr 2017 13:12:19 -0500 [thread overview]
Message-ID: <65718a2d-c866-09a9-b60c-69a6b9a263fd@redhat.com> (raw)
In-Reply-To: <87r30n83d1.fsf@dusky.pond.sub.org>
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On 04/20/2017 11:12 AM, Markus Armbruster wrote:
>>> Well technically /usr/sbin/halt just terminates all processes / kernel and
>>> halts CPUs, but the virtual machine is still active (and a 'reset' in the
>>> monitor can start it again. /usr/sbin/poweroff is what actually does the
>>> ACPI poweroff to trigger QEMU to exit[1]
>>
>> I'm thinking of this wording:
>>
>> triggered by a guest request (such as the guest running
>> /usr/sbin/poweroff to trigger an ACPI shutdown or machine halt instruction)
>
> A quick glance at the patch suggests the instructions in question are
> typically writes to some device register. I wouldn't call them "halt
> instructions", in particular since there's the x86 "hlt" instruction
> that does something else.
Then maybe: a guest request (such as the guest running
/usr/sbin/poweroff to trigger an ACPI or other hardware-specific
shutdown sequence)
--
Eric Blake, Principal Software Engineer
Red Hat, Inc. +1-919-301-3266
Virtualization: qemu.org | libvirt.org
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next prev parent reply other threads:[~2017-04-20 18:12 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-04-19 22:22 [Qemu-devel] [PATCH v2] event: Add source information to SHUTDOWN Eric Blake
2017-04-19 22:36 ` Alistair Francis
2017-04-20 1:11 ` Eric Blake
2017-04-20 11:59 ` Markus Armbruster
2017-04-20 12:09 ` Daniel P. Berrange
2017-04-20 13:20 ` Eric Blake
2017-04-20 16:12 ` Markus Armbruster
2017-04-20 18:12 ` Eric Blake [this message]
2017-04-20 13:31 ` Eric Blake
2017-04-20 16:18 ` Markus Armbruster
2017-04-20 19:05 ` Eric Blake
2017-04-20 22:55 ` Alistair Francis
2017-04-20 20:28 ` Eric Blake
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