Re: [Xen-devel] [RFC v2] xen/arm: Suspend to RAM Support in Xen for ARM

["Edgar E. Iglesias" <edgar.iglesias@xxxxxxxxxx>]

On Tue, Jan 23, 2018 at 01:52:50PM +0200, Oleksandr Tyshchenko wrote:
> Hi Mirela,
> 
> Just some remarks regarding the scope of work:
> 
> +In addition, the following have to be implemented:
> +* Suspend/resume vCPU (triggered by vSYSTEM_SUSPEND call)
> +* Suspend/resume Xen (triggered by vSYSTEM_SUSPEND called by Dom0), 
> including:
> +       * Disable wathdog on suspend, enable it on resume
> +       * Pause domains on suspend, unpause them on resume
> +       * Disable non-boot pCPUs on suspend, enable them on resume
> +       * Save/restore of GIC configuration
> +       * Suspend/resume timer
> +       * Save/restore of EL2 context
> +       * Implement resume entry point in Xen, including MMU configuration
> 
> I think that saving/restoring IOMMU registers/context should be
> implemented as well.

Yes, good point.
Mirela, I think that in the ZU+ case the IOMMU actually gets powered down
with the FPD.


> In other words, each involved platform device driver in Xen on ARM
> (IOMMU-XX, UART-XX, etc) should have suspend/resume callbacks
> implemented.

Yes agreed.

Best regards,
Edgar


> 
> -- 
> Regards,
> 
> Oleksandr Tyshchenko

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