Hi Jean,

quoted

Why is BTM mandated for SVA? I couldn't find this requirement in 
SMMU spec (Sorry if I missed it or this got discussed earlier). But 
if performance is the

only concern here,

quoted

is it better just to allow it with a warning rather than limiting 
SMMUs without

BTM?

It's a performance concern and requires to support multiple 
configurations, but the spec allows it. Are there SMMUs without BTM 
that need it?

The Tegra Next Generation SOC uses arm-smmu-v3, but it doesn't have support for BTM.
Do you have plan to get your earlier patch to handle invalidate notifications into upstream sometime soon? 
Can the dependency on BTM be relaxed with the patch?

PATCH v9 13/13] iommu/arm-smmu-v3: Hook up ATC invalidation to mm ops
https://www.spinics.net/lists/arm-kernel/msg825099.html

-KR

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