linux-kernel - Re: [PATCH v2 0/7] Asynchronous notifications from secure world

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Message-ID: <CAHUa44EeAENHv+CxtXeLuqX_NGWW6w-6P8D-BLsb69+XmGaqEQ@mail.gmail.com>
Date:   Thu, 17 Jun 2021 08:10:01 +0200
From:   Jens Wiklander <jens.wiklander@...aro.org>
To:     Sumit Garg <sumit.garg@...aro.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        OP-TEE TrustedFirmware <op-tee@...ts.trustedfirmware.org>,
        Devicetree List <devicetree@...r.kernel.org>,
        Linux Doc Mailing List <linux-doc@...r.kernel.org>,
        Jerome Forissier <jerome@...issier.org>,
        Etienne Carriere <etienne.carriere@...aro.org>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Jonathan Corbet <corbet@....net>,
        Ard Biesheuvel <ardb@...nel.org>, Marc Zyngier <maz@...nel.org>
Subject: Re: [PATCH v2 0/7] Asynchronous notifications from secure world

Hi Sumit,

On Thu, Jun 17, 2021 at 6:33 AM Sumit Garg <sumit.garg@...aro.org> wrote:
>
> Hi Jens,
>
> On Wed, 16 Jun 2021 at 16:07, Jens Wiklander <jens.wiklander@...aro.org> wrote:
> >
> > Hi all,
> >
> > This adds support for asynchronous notifications from OP-TEE in secure
> > world to the OP-TEE driver. This allows a design with a top half and bottom
> > half type of driver where the top half runs in secure interrupt context and
> > a notifications tells normal world to schedule a yielding call to do the
> > bottom half processing.
> >
> > An interrupt is used to notify the driver that there are asynchronous
> > notifications pending.
> >
>
> It looks like a nice feature. I would like to get hands on with this.
> Can I test this feature on Qemu?

Absolutely, you can get this into the normal OP-TEE development repo setup with:
repo init -u https://github.com/OP-TEE/manifest.git -m default.xml
repo sync
Update optee_os with
https://github.com/jenswi-linaro/optee_os/tree/async_notif_v2
Update linux with https://github.com/jenswi-linaro/linux-1/tree/async_notif_v2
cd build
make all -j...
make run-only

If you type anything at the secure console you'll notice how it
changes behaviour once the Linux kernel has booted.

Cheers,
Jens

>
> -Sumit
>
> > v2:
> > * Added documentation
> > * Converted optee bindings to json-schema and added interrupt property
> > * Configure notification interrupt from DT instead of getting it
> >   from secure world, suggested by Ard Biesheuvel <ardb@...nel.org>.
> >
> > Thanks,
> > Jens
> >
> > Jens Wiklander (7):
> >   docs: staging/tee.rst: add a section on OP-TEE notifications
> >   dt-bindings: arm: Convert optee binding to json-schema
> >   dt-bindings: arm: optee: add interrupt property
> >   tee: fix put order in teedev_close_context()
> >   tee: add tee_dev_open_helper() primitive
> >   optee: separate notification functions
> >   optee: add asynchronous notifications
> >
> >  .../bindings/arm/firmware/linaro,optee-tz.txt |  31 ---
> >  .../arm/firmware/linaro,optee-tz.yaml         |  57 +++++
> >  Documentation/staging/tee.rst                 |  27 +++
> >  drivers/tee/optee/Makefile                    |   1 +
> >  drivers/tee/optee/call.c                      |  27 +++
> >  drivers/tee/optee/core.c                      |  87 +++++--
> >  drivers/tee/optee/notif.c                     | 226 ++++++++++++++++++
> >  drivers/tee/optee/optee_msg.h                 |   9 +
> >  drivers/tee/optee/optee_private.h             |  23 +-
> >  drivers/tee/optee/optee_rpc_cmd.h             |  31 +--
> >  drivers/tee/optee/optee_smc.h                 |  75 +++++-
> >  drivers/tee/optee/rpc.c                       |  73 +-----
> >  drivers/tee/tee_core.c                        |  37 ++-
> >  include/linux/tee_drv.h                       |  27 +++
> >  14 files changed, 576 insertions(+), 155 deletions(-)
> >  delete mode 100644 Documentation/devicetree/bindings/arm/firmware/linaro,optee-tz.txt
> >  create mode 100644 Documentation/devicetree/bindings/arm/firmware/linaro,optee-tz.yaml
> >  create mode 100644 drivers/tee/optee/notif.c
> >
> > --
> > 2.31.1
> >