Re: [Xen-devel] [Qemu-devel] [PATCH 19/18] Introduce "xen-load-devices-state"

[Eric Blake <eblake@xxxxxxxxxx>]

On 10/24/2014 01:06 AM, Wen Congyang wrote:
> Introduce a "xen-load-devices-state" QAPI command that can be used to load
> the state of all devices, but not the RAM or the block devices of the
> VM.
> 
> We only have hmp commands savevm/loadvm, and qmp commands
> xen-save-devices-state.
> 
> We use this new command for COLO:
> 1. suspend both primay vm and secondary vm
> 2. sync the state
> 3. resume both primary vm and secondary vm
> 
> In such case, we need to update all devices's state in any time.
> 
> Signed-off-by: Wen Congyang <wency@xxxxxxxxxxxxxx>
> Cc: qemu-devl <qemu-devel@xxxxxxxxxx>
> Cc: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
> Cc: Paolo Bonzini <pbonzini@xxxxxxxxxx>
> ---
>  qapi-schema.json | 18 ++++++++++++++++++
>  qmp-commands.hx  | 27 +++++++++++++++++++++++++++
>  savevm.c         | 36 ++++++++++++++++++++++++++++++++++++
>  3 files changed, 81 insertions(+)
> 

> +#
> +# Since: 2.0
> +##
> +{ 'command': 'xen-load-devices-state', 'data': {'filename': 'str'} }

s/2.0/2.2/ - if you even get it in 2.2 (haven't we already passed soft
freeze, but this is a feature addition?)

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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