Re: [RFC PATCH v1 11/38] KVM: arm64: CCA: register host tsm platform device

Jason Gunthorpe
2025-10-10T15:30:54Z

On Fri, Oct 10, 2025 at 10:28:36AM -0500, Jeremy Linton wrote:

> > So you could use auxiliary_device, you'd consider SMC itself to be the
> > shared HW block and all the auxiliary drivers are per-subsystem
> > aspects of that shared SMC interface. It is not a terrible fit for
> > what it was intended for at least.
>
> Turns out that changing any of this, will at the moment break systemd's
> confidential vm detection, because they wanted the earliest indicator the
> guest was capable and that turned out to be this platform device.

Having systemd detect a software created platform device sounds
compltely crazy, don't do that. Make a proper sysfs uapi for such a
general idea please.

Jason