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Re: [PATCH v3 11/11] hw/arm/smmuv3: Advertise SMMUv3.2 range invalidatio

From: Peter Maydell
Subject: Re: [PATCH v3 11/11] hw/arm/smmuv3: Advertise SMMUv3.2 range invalidation
Date: Fri, 10 Jul 2020 11:39:38 +0100

On Fri, 10 Jul 2020 at 11:05, Auger Eric <eric.auger@redhat.com> wrote:
> On 7/10/20 11:47 AM, Peter Maydell wrote:
> > I think that to advertise SMMUv3.2 we would also need to
> > set the IDR3.BBML field to something non-zero. That means
> > we need to analyze our implementation of the caching of page
> > table structures to see if we need to do anything different
> > (per the behaviours and guarantees described in section 3.21.1
> > of the spec).
> you're right. I need to further study this feature.
> I felt difficult to find out which features are mandatory for a given
> revision number.

Mmm. I ended up just working through all the ID register
fields looking for references to 3.1 or 3.2 in them,
but it's easy to overlook one (I failed to catch
the IDR3.HAD requirement in my initial scan,
for instance :-)).

-- PMM

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