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Re: [PATCH 2/2] docs/microvm.rst: add instructions for shutting down the
From: |
Paolo Bonzini |
Subject: |
Re: [PATCH 2/2] docs/microvm.rst: add instructions for shutting down the guest |
Date: |
Fri, 15 Nov 2019 17:26:33 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 |
On 15/11/19 17:13, Sergio Lopez wrote:
> Add a new section explaining the particularities of the microvm
> machine type for triggering a guest-initiated shut down.
>
> Signed-off-by: Sergio Lopez <address@hidden>
> ---
> docs/microvm.rst | 21 +++++++++++++++++++++
> 1 file changed, 21 insertions(+)
>
> diff --git a/docs/microvm.rst b/docs/microvm.rst
> index 4cf84746b9..fcf41fc1f6 100644
> --- a/docs/microvm.rst
> +++ b/docs/microvm.rst
> @@ -106,3 +106,24 @@ disabled::
> -device virtio-blk-device,drive=test \
> -netdev tap,id=tap0,script=no,downscript=no \
> -device virtio-net-device,netdev=tap0
> +
> +
> +Triggering a guest-initiated shut down
> +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> +
> +As the microvm machine type includes just a small set of system
> +devices, some x86 mechanisms for rebooting or shutting down the
> +system, like sending a key sequence to the keyboard or writing to an
> +ACPI register, doesn't have any effect in the VM.
> +
> +The recommended way to trigger a guest-initiated shut down is by
> +generating a ``triple-fault``, which will cause the VM to initiate a
> +reboot. Additionally, if the ``-no-reboot`` argument is present in the
> +command line, QEMU will detect this event and terminate its own
> +execution gracefully.
> +
> +Linux does support this mechanism, but by default will only be used
> +after other options have been tried and failed, causing the reboot to
> +be delayed by a small number of seconds. It's possible to instruct it
> +to try the triple-fault mechanism first, by adding ``reboot=t`` to the
> +kernel's command line.
>
Queued, thanks.
Paolo