Re: [PATCH 0/2] Xen FF-A mediator

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

On Tue, 7 Jun 2022, Jens Wiklander wrote:
> Hi,
> 
> This patch sets add a FF-A [1] mediator modeled after the TEE mediator
> already present in Xen. The FF-A mediator implements the subset of the FF-A
> 1.1 specification needed to communicate with OP-TEE using FF-A as transport
> mechanism instead of SMC/HVC as with the TEE mediator. It allows a similar
> design in OP-TEE as with the TEE mediator where OP-TEE presents one virtual
> partition of itself to each guest in Xen.
> 
> The FF-A mediator is generic in the sense it has nothing OP-TEE specific
> except that only the subset needed for OP-TEE is implemented so far. The
> hooks needed to inform OP-TEE that a guest is created or destroyed is part
> of the FF-A specification.
> 
> It should be possible to extend the FF-A mediator to implement a larger
> portion of the FF-A 1.1 specification without breaking with the way OP-TEE
> is communicated with here. So it should be possible to support any TEE or
> Secure Partition using FF-A as transport with this mediator.
> 
> [1] https://developer.arm.com/documentation/den0077/latest
> 
> Thanks,
> Jens

Hi Jens,

Many thanks for the patches! I tried to apply them to the master branch
but unfortunately they don't apply any longer. Could you please rebase
them on master (or even better rebase them on staging) and resend?

Thank you!



> Jens Wiklander (2):
>   xen/arm: smccc: add support for SMCCCv1.2 extended input/output
>     registers
>   xen/arm: add FF-A mediator
> 
>  xen/arch/arm/Kconfig         |   11 +
>  xen/arch/arm/Makefile        |    1 +
>  xen/arch/arm/arm64/smc.S     |   43 +
>  xen/arch/arm/domain.c        |   10 +
>  xen/arch/arm/ffa.c           | 1624 ++++++++++++++++++++++++++++++++++
>  xen/arch/arm/vsmc.c          |   19 +-
>  xen/include/asm-arm/domain.h |    4 +
>  xen/include/asm-arm/ffa.h    |   71 ++
>  xen/include/asm-arm/smccc.h  |   42 +
>  9 files changed, 1821 insertions(+), 4 deletions(-)
>  create mode 100644 xen/arch/arm/ffa.c
>  create mode 100644 xen/include/asm-arm/ffa.h