Re: [Xen-devel] [RFC] xen/arm: Handling cache maintenance instructions by set/way

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

.snip..
> The suggested policy is based on the KVM one:
>       - If we trap a S/W instructions, we enable VM trapping (e.g 
> HCR_EL2.TVM) to
> detect cache being turned on/off, and do a full clean.
>       - We flush the caches on both caches being turned on and off.
>       - Once the caches are enabled, we stop trapping VM instructions.
> 
> Doing a full clean will require to go through the P2M and flush the entries
> one by one. At the moment, all the memory is mapped. As you can imagine
> flushing guest with hundreds of MB will take a very long time (Linux timeout
> during CPU bring).

Yikes. Since you mention 'based on the KVM one' - did they solve this particular
problem or do they also have the same issue?

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