[Xen-devel] Requesting a freeze exception for vm_event memory introspection helpers

[Razvan Cojocaru <rcojocaru@xxxxxxxxxxxxxxx>]

Hello,

I'd like to ask for a freeze exception for the "vm_event memory
introspection helpers" series.

[PATCH 1/3] xen/mem_access: Support for memory-content hiding
[PATCH 2/3] xen/vm_event: Support for guest-requested events
[PATCH 3/3] xen/vm_event: Deny register writes if refused by
vm_event reply

All patches have been acked by at least one person (though patch 1 is
still under some discussion).

1. Benefits of the series making it in this release:

* Probably the most important benefit is that 4.6 development has been
very open to refactoring vm_events, and patch 3/3 makes vm_events behave
in a consistent manner (all register-write vm_events are pre-write events).

* There are 3rd parties interested in these features (Tamas, for
example, has already expressed interest in uses of patch 1/1).

2. Risks of including the series:

* Since two of the three patches have already received acks from 3+
people, I would assume that the risks for those are minimal. As for the
first patch, unless a vm_event consumer uses the new
VM_EVENT_FLAG_SET_EMUL_READ_DATA vm_event response flag in conjunction
with VM_EVENT_FLAG_EMULATE, the impact should be close to 0 (only a few
"if ( unlikely(set_context_enabled) )" extra statements).

A new series will follow as soon as possible, addressing Jan's comments
on the first patch and cleaning up patch 3 a little more.


Thank you in advance for considering this,
Razvan

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