Philippe Gerum wrote: > Jan Kiszka wrote: >> Hi, >> >> doesn't this patch [1] have some relevance for us as well? As we use >> xnarch_remap_io_page_range also for non-IO memory, I'm hesitating to >> suggest that we apply this unconditionally at xnarch level. Ideas welcome. >> > > Yes, I think it makes a lot of sense on powerpc at least, since doing so will > set the PAGE_GUARDED bit as well, and we obviously want to avoid any > out-of-order access of I/O memory. > > (I don't see the reason to force the VM_RESERVED and VM_IO on the vma though, > since remap_pfn_range will do it anyway.)
No, I was talking about cases where we may pass kmalloc'ed memory to xnarch_remap_io_page_range. In that case, caching and out-of-order access may be desired for performance reasons. Jan
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