Re: [PATCH] libxl: arm: Allow grant mappings for backends running on Dom0

[Viresh Kumar <viresh.kumar@xxxxxxxxxx>]

On 05-05-23, 16:11, Oleksandr Tyshchenko wrote:
> I was going to propose an idea, but I have just realized that you already
> voiced it here [1] ))
> So what you proposed there sounds reasonable to me.
> 
> I will just rephrase it according to my understanding:
> 
> We probably need to consider transforming your "forced_grant" to something
> three-state, for example
> "grant_usage" (or "use_grant" as you suggested) which could be "default
> behaviour" or "always disabled", or "always enabled".
> 
> With "grant_usage=default" we will get exact what we have at the moment
> (only create iommu nodes if backend-domid != 0)
> With "grant_usage=disabled" we will force grants to be always disabled
> (don't create iommu nodes irrespective of the domain)
> With "grant_usage=enabled" we will force grants to be always enabled
> (always create iommu nodes irrespective of the domain)

I was wondering if "grant_usage=default" can be interpreted by the
absence of the grant_usage parameter. So just grant_usage=1 or 0,
which would mean enabled or disabled and if grant_usage isn't passed,
we would switch back to default.

-- 
viresh