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d4236f1ef2
pKVM usage of S2 translation on the host is purely for isolation purposes, not translation. To that effect, the memory attributes being used must be that of S1. With FWB=0, this is easily achieved by using the Normal Cacheable type (which is the weakest possible memory type) at S2, and let S1 pick something stronger as required. With FWB=1, the attributes are combined in a different way, and we cannot arbitrarily use Normal Cacheable. We can, however, use a memattr encoding that indicates that the final attributes are that of Stage-1. Add these encoding and a few pointers to the relevant parts of the specification. It might come handy some day. Reviewed-by: Joey Gouly <joey.gouly@arm.com> Reviewed-by: Fuad Tabba <tabba@google.com> Tested-by: Fuad Tabba <tabba@google.com> Link: https://patch.msgid.link/20260123191637.715429-2-maz@kernel.org Signed-off-by: Marc Zyngier <maz@kernel.org>