• Eric Auger's avatar
    hw/intc/arm_gicv3_its: Implement state save/restore · cddafd8f
    Eric Auger authored
    We need to handle both registers and ITS tables. While
    register handling is standard, ITS table handling is more
    challenging since the kernel API is devised so that the
    tables are flushed into guest RAM and not in vmstate buffers.
    
    Flushing the ITS tables on device pre_save() is too late
    since the guest RAM is already saved at this point.
    
    Table flushing needs to happen when we are sure the vcpus
    are stopped and before the last dirty page saving. The
    right point is RUN_STATE_FINISH_MIGRATE but sometimes the
    VM gets stopped before migration launch so let's simply
    flush the tables each time the VM gets stopped.
    
    For regular ITS registers we just can use vmstate pre_save()
    and post_load() callbacks.
    Signed-off-by: 's avatarEric Auger <eric.auger@redhat.com>
    Message-id: 1497023553-18411-3-git-send-email-eric.auger@redhat.com
    Reviewed-by: 's avatarPeter Maydell <peter.maydell@linaro.org>
    Signed-off-by: 's avatarPeter Maydell <peter.maydell@linaro.org>
    cddafd8f
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