On 23/07/13 18:27, Stefano Stabellini wrote: > Currently ballooned out pages are mapped to 0 and have INVALID_P2M_ENTRY > in the p2m. These ballooned out pages are used to map foreign grants > by gntdev and blkback (see alloc_xenballooned_pages). > > Allocate a page per cpu and map all the ballooned out pages to the > corresponding mfn. Set the p2m accordingly. This way reading from a > ballooned out page won't cause a kernel crash (see > http://lists.xen.org/archives/html/xen-devel/2012-12/msg01154.html).
Reviewed-by: David Vrabel <david.vra...@citrix.com> A number of users of DEFINE_PER_CPU() initialize it with for_each_possible_cpu() without registering a cpu notifier, so I think there is no risk that offlining a CPU clears its per-cpu data and the code as-is is fine. David -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
