Re: [Xen-devel] [PATCH v2 3/4] xen/arm: introduce GNTTABOP_cache_flush

[David Vrabel <david.vrabel@xxxxxxxxxx>]

On 08/10/14 13:17, Ian Campbell wrote:
> On Wed, 2014-10-08 at 12:54 +0100, Stefano Stabellini wrote:
>>> Instead of this hypercall, could the guest clean/invalidate by set/way?
>>>  I guess this would need a suitable IPA which could be obtained by some
>>> (offset) 1:1 mapping in the stage 2 tables?
>>
>> I wish I could: as the clean/invalidate by set/way is implementation
>> specific, there is now way to use it to clean a specific range of
>> addresses.
> 
> Clean by set/way is basically unusable except in very specific
> circumstances (e.g. tearing down prior to a suspend). It's certainly not
> usable on an active SMP system.
> 
> http://lists.xen.org/archives/html/xen-devel/2014-10/msg00709.html

Yeah, I saw that email after I made my suggestion.

David

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