On 2013-05-07 19:26, Jan Kiszka wrote: > Well, the alternative is to handle a sub-page dispatch (ie. calling into > subpage_[ram_]read/write just like address_space_rw: take the necessary > lock that protect mapping changes, look into the sub-page and pick up > the target region, invoke memory_region_ref on it, perform the access > and unref the region again. Slow, but that's how sub-pages are. And it > only affects TCG. Hmm, or does your IOMMU core cache translations on a > per-page base as well?
OK, there is no translation caching in the memory core. So I will preserve the dispatching functions of sub-pages, just like the term "sub-page" - along with a comment why we depend on page granularity. Jan -- Siemens AG, Corporate Technology, CT RTC ITP SDP-DE Corporate Competence Center Embedded Linux
