Re: [PATCH] xen/arm: smmuv1: remove iommu group when deassign a device

[Mykyta Poturai <mykyta.poturai@xxxxxxxxx>]

Hi Julien, Rahul
I've encountered a similar problem with IMX8 GPU recently. It wasn't probing
properly after the domain reboot.  After some digging, I came to the same
solution as Rahul and found this thread. I also encountered the occasional
"Unexpected global fault, this could be serious" error message when destroying
a domain with an actively-working GPU.

>Hmmmm.... Looking at the code, arm_smmu_alloc_smes() doesn't seem to use
>the domain information. So why would it need to be done every time it is 
>assigned?
Indeed after removing the arm_smmu_master_free_smes() call, both reboot and 
global
fault issues are gone. If I understand correctly, device removing is not yet
supported, so I can't find a proper place for the arm_smmu_master_free_smes() 
call.
Should we remove the function completely or just left it commented for later or
something else?

Rahul, are you still working on this or could I send my patch?

Regards,
Mykyta