Re: [Xen-devel] [PATCH for-4.12] arm/p2m: do not invalidate p2m root if it is shared with IOMMU

[Andrii Anisov <andrii.anisov@xxxxxxxxx>]

On 29.01.19 15:53, Julien Grall wrote:
> Which proprietary kernel driver? And in which context are Set/Way operations 
> used?
I would not name it, it is proprietary ;) But we can't live without it.

> Using Set/Way is fundamentally broken partly because it does not deal with 
> system caches.
I already know it. I've looked at KVM presentation from 2015, your last year 
video from China, reading through ARM ARM.


> It also only applies to a given cache and the behavior will not be replicated 
> to other CPUs.
In our case cpu cache flushing by Set/Way it is propagated to all cpus with 
`on_each_cpu()`. (Here should be a facepalm emoji)

> Running such software is a call for nasty behavior in your guest.
I do understand that.
But we have to handle that. And it is a question to us how to do that.

--
Sincerely,
Andrii Anisov.

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