search for: pageforeign

...or others)? Any chance this will get into >> 3.0.2? Certainly it should be changed before attempting to push >> the drivers upstream to Linux. > >What do you think of the followings? Too hacky? > > >extern struct address_space xen_ia64_foreign_dummy_mapping; >#define PageForeign(page) \ > (page->mapping == &xen_ia64_foreign_dummy_mapping) > >#define SetPageForeign(page, dtor) do { \ > set_page_private((page), (unsigned long)dtor); \ > (page)->mapping = &xen_ia64_foreign_dummy_mapping; \ >} while (0) > >#define ClearPageForeign(page...

..._SYMBOL(gnttab_copy_grant_page); * * All other pages are simply returned as is. */ -maddr_t gnttab_dma_map_page(struct page *page) -{ - maddr_t maddr = page_to_bus(page); +void __gnttab_dma_map_page(struct page *page, + int (*local_pfn)(struct page *page)) +{ unsigned int seq; - if (!PageForeign(page)) - return maddr; + if (!is_running_on_xen() || !PageForeign(page)) + return; do { seq = read_seqbegin(&gnttab_dma_lock); - maddr = page_to_bus(page); - - /* Has it become a local MFN? */ - if (pfn_valid(mfn_to_local_pfn(maddr >> PAGE_SHIFT))) + + if (local_pfn &&amp...

...The issue is that PG_arch_1 is reserved for arch-specific > > usage, the paravirtualization changes for Xenlinux utilize > > it (to mark foreign pages) because it was otherwise unused > > in Linux/x86. But Xen is no longer an arch. > > > > Grep''ing for "PageForeign" in -sparse will show most (all?) > > of the actual uses of it. Nearly all are in x86-specific > > code. But one is in netback_init(). > > That thread seems to already have a solution. Has anybody run it past > Linux MM people? (Adding xen-devel to CC for greater expos...

>From: Isaku Yamahata >Sent: 2006年3月14日 12:43 >> > >> >What do you think of the followings? Too hacky? >> > >> > >> >extern struct address_space xen_ia64_foreign_dummy_mapping; >> >#define PageForeign(page) \ >> > (page->mapping == &xen_ia64_foreign_dummy_mapping) >> > >> >#define SetPageForeign(page, dtor) do { \ >> > set_page_private((page), (unsigned long)dtor); \ >> > (page)->mapping = &xen_ia64_foreign_dummy_mapping; \ >>...

...ck although as I say I think the class of problem reaches a bit wider than that. Whether the session will be a discussion around ways of solving the issue or a presentation on the solution remains to be seen ;-) Ian. [0] at least with a mainline kernel, in the older out-of-tree Xen stuff we had a PageForeign page-flag and a destructor function in a spare struct page field which was called from the mm free routines (free_pages_prepare and free_hot_cold_page). I''m under no illusions about the upstreamability of this approach... _______________________________________________ Xen-devel mailing...