On Fri, Jun 10, 2011 at 09:40:34AM +0100, Christoffer Dall wrote: > OK, so I looked into compiling KVM/ARM as a module and there are a few > obstacles: > > I need to export several symbols (identitiy_mapping_add, > pgd_clear_bad, __irq_svc). __irq_svc is tricky because it's in the > entry-armv.S assembly file, so it's not obvious where to export it > from. Recommendations? (dedicated KVM export file as in PPC or simply > adding EXPORT_SYMBOL_GPL(...) or alternative? There is arch/arm/kernel/armksyms.c where we export extra symbols coming from .S files. I haven't looked at the code yet, maybe some of the symbols could be avoided. > Also, iirc, modules are loaded using vmalloc, wouldn't that make it > impossible for me to use virt_to_phys, which I need to do on some of > the code pages for Hypervisor initialization? If any of the ARM people > could give an advise here, it would be much appreciated - of course I > can kmalloc a page and relocate the init code, but I really would like > to avoid this. You could alloc a page (or a few) an copy the hypervisor code in there. Just make sure that it is position independent (which is not difficult with hand-written assembly). Alternatively, you could set up the Hyp translation tables to also include the modules area (pretty much duplicating the corresponding swapper_pg_dir entries, with some attributes changed). But for now you can probably ignore this issue and get back to it once everything else is working. -- Catalin
