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Re: [Xen-devel] Re: Next steps with pv_ops for Xen

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.



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