[Xen-devel] vm_event regression in 4.7

[Tamas K Lengyel <tamas.k.lengyel@xxxxxxxxx>]

Hello all,

with the latest master branch of Xen there is a regression enabling vm_event on a domain. If an event listener was previously active on the domain it is now not possible to reenable events as the domctl returns -EINVAL. The problem seems to stem from activating the magic page for vm_event using prepare_ring_for_helper as it returns NULL. Further looking into where things go wrong within that function it seems the page type returned by __get_gfn_type_access is p2m_ram_logdirty with an invalid mfn (0xffffffffffffffff) and then it hits "Error path: not a suitable GFN at all".

Can anyone point me to which change or what may be causing this?

Thanks,

Tamas

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