Re: [Xen-devel] [PATCH v7 08/18] tools/libxl: introduce libxl__domain_restore_device_model to load qemu state

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Fri, Jan 29, 2016 at 01:27:24PM +0800, Wen Congyang wrote:
> In normal migration, the qemu state is passed to qemu as a parameter.
> With COLO, secondary vm is running. So we will do the following steps
> at every checkpoint:
> 1. suspend both primary vm and secondary vm
> 2. sync the state
> 3. resume both primary vm and secondary vm
> Primary will send qemu's state in step2, and secondary's qemu should
> read it and restore the state before it is resumed. We can not pass
> the state to qemu as a parameter because secondary QEMU already started
> at this point, so we introduce libxl__domain_restore_device_model() to
> do it. This API MUST be called before resuming secondary vm.
> 
> Signed-off-by: Yang Hongyang <hongyang.yang@xxxxxxxxxxxx>
> Signed-off-by: Wen Congyang <wency@xxxxxxxxxxxxxx>
> Cc: Anthony Perard <anthony.perard@xxxxxxxxxx>

Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>

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