[Xen-devel] [PATCH 0/2] Introspection optimization helpers

[Razvan Cojocaru <rcojocaru@xxxxxxxxxxxxxxx>]

Hello,

This series adds two minor patches. The first one allows finer-grained
control over the emulation behaviour of REP instructions. Previously,
once vm_event-based emulation was enabled, no optimizations were allowed.
However, this has a performance impact on the monitored guest, so I've
added a new libxc function to enable / disable this at will at any point.

The second patch addresses an older issue: in my initial series a few
years back, there was a (longish) patch that computed the length of the
current instruction, and advanced the instruction pointer past it if
it was required by the vm_event reply. However, integrating that code
has not been trivial, and so the second patch in this series simply
allows a vm_event reply to say that the instruction pointer should be
set to whatever value it sends back to the hypervisor. This way, the
computation of the instruction length is left to the userspace
application.

[PATCH 1/2] xen, libxc: Introduced XEN_DOMCTL_emulate_each_rep
[PATCH 2/2] xen: Introduce VM_EVENT_FLAG_SET_EIP


Thanks,
Razvan

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