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Re: [Qemu-arm] [Qemu-devel] [PATCH v2] event: Add source information to
From: |
Eric Blake |
Subject: |
Re: [Qemu-arm] [Qemu-devel] [PATCH v2] event: Add source information to SHUTDOWN |
Date: |
Thu, 20 Apr 2017 13:12:19 -0500 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.0 |
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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Re: [Qemu-arm] [Qemu-devel] [PATCH v2] event: Add source information to SHUTDOWN, Eric Blake, 2017/04/20