Keir Fraser wrote:
Actually I'm not so sure now. Presumably you add VM_PFNMAP to make vm_normal_page() return NULL? But actually I would expect pte_pfn() to return max_mapnr because the mapped page is not a local page. And that should cause vm_normal_page() to return NULL always, regardless of whether you assert VM_PFNMAP. Is gntdev being used to grant-and-map local pages in the test that causes the crash?
That's right (gntdev is being used to map (but not grant) a local page). The test case creates a virtual block device in Dom0, and attempts to map its ring buffer in a user-space daemon in Dom0. Therefore pte_pfn succeeds.
Regards, Derek. _______________________________________________ Virtualization mailing list Virtualization@lists.linux-foundation.org https://lists.linux-foundation.org/mailman/listinfo/virtualization
