spapr: convert TCE API to use an opaque type
The TCE table is currently returned as a DMAContext, and non-type-safe APIs are called later passing back the DMAContext. Since we want to move away from DMAContext, use an opaque type instead, and add an accessor to retrieve the DMAContext from it. Acked-by: NDavid Gibson <david@gibson.dropbear.id.au> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
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