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This adds a tracepoint to trace the KVM_SET_USER_MEMORY_REGION ioctl parameters which is quite useful for debugging VFIO memory regions being actually registered with KVM. Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru> Message-Id: <20171215052326.21386-1-aik@ozlabs.ru> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>