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Re: [Xen-devel] [RFC v2 3/6] xen/arm: Allow platform_hvc to handle guest SMC calls
On Wed, Feb 8, 2017 at 1:31 AM, Edgar E. Iglesias <edgar.iglesias@xxxxxxxxxx> wrote:
certainly there are many cases where the system would become very complex when there is functionality like what you describe in the TZ that needs to be made accessible via SMC. The setup I described is experimental only, and the underlying assumption is that the TZ is working jointly with the monitor application (ie. both are aware of each other). So it is really not intended to work with just any firmware.
So I think for the sake of reducing complexity, having the monitor system be exclusive when enabled should make everyone's life simpler. Having a passive monitoring mode as you suggest is certainly an option, although it should not be the only option, exclusive routing of SMCs through monitor applications should still be available to be configured by the user. Since I really don't know of any usecases where passive monitoring of SMCs is required, I don't think we should go that route.
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