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Re: [Qemu-devel] [RFC v5 2/4] hw/intc/arm_gicv3_its: Implement state sav

From: Prakash B
Subject: Re: [Qemu-devel] [RFC v5 2/4] hw/intc/arm_gicv3_its: Implement state save/restore
Date: Wed, 26 Apr 2017 17:10:15 +0530

On Fri, Apr 14, 2017 at 6:16 PM, Eric Auger <address@hidden> wrote:
> 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: Eric Auger <address@hidden>
Tested-by: Prakash, Brahmajyosyula <address@hidden>

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