Andrea Arcangeli wrote: > On Tue, Apr 29, 2008 at 06:12:51PM -0500, Anthony Liguori wrote: > >> IIUC PPC correctly, all IO pages have corresponding struct pages. This >> means that get_user_pages() would succeed and you can reference count them? >> In this case, we would never take the VM_PFNMAP path. >> > > get_user_pages only works on vmas where only pfn with struct page can > be mapped, but if a struct page exists it doesn't mean get_user_pages > will succeed. All mmio regions should be marked VM_IO as reading on > them affects hardware somehow and that prevents get_user_pages to work > on them regardless if a struct page exists. >
Ah, thanks for the clarification. Regards, Anthony Liguori ------------------------------------------------------------------------- This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Don't miss this year's exciting event. There's still time to save $100. Use priority code J8TL2D2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone _______________________________________________ kvm-devel mailing list kvm-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/kvm-devel
