linux-kernel - Re: [PATCH v2 1/1] tee: add cancellation support to client interface

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Date:   Thu, 14 Feb 2019 09:42:33 +0100
From:   Jens Wiklander <jens.wiklander@...aro.org>
To:     Igor Opaniuk <igor.opaniuk@...aro.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        tee-dev@...ts.linaro.org,
        Jerome Forissier <jerome.forissier@...aro.org>,
        "Zengtao (B)" <prime.zeng@...ilicon.com>,
        Sumit Garg <sumit.garg@...aro.org>
Subject: Re: [PATCH v2 1/1] tee: add cancellation support to client interface

Hi Igor,

On Wed, Feb 13, 2019 at 2:36 PM Igor Opaniuk <igor.opaniuk@...aro.org> wrote:
>
> On Thu, 24 Jan 2019 at 19:32, Igor Opaniuk <igor.opaniuk@...aro.org> wrote:
> >
> > Add support of cancellation request to the TEE kernel internal
> > client interface. Can be used by software TPM drivers, that leverage
> > TEE under the hood (for instance TPM2.0 mobile profile), for requesting
> > cancellation of time-consuming operations (RSA key-pair generation etc.).
> >
> > Signed-off-by: Igor Opaniuk <igor.opaniuk@...aro.org>
> > ---
> >
> > v2:
> > - use tee_ioctl_cancel_arg to provide session and cancel_id
> > - fix tee_client_cancel_req function description header
> >
> >  drivers/tee/tee_core.c  | 10 ++++++++++
> >  include/linux/tee_drv.h | 12 ++++++++++++
> >  2 files changed, 22 insertions(+)
> >
> > diff --git a/drivers/tee/tee_core.c b/drivers/tee/tee_core.c
> > index 7b2bb4c..1148175 100644
> > --- a/drivers/tee/tee_core.c
> > +++ b/drivers/tee/tee_core.c
> > @@ -1027,6 +1027,16 @@ int tee_client_invoke_func(struct tee_context *ctx,
> >  }
> >  EXPORT_SYMBOL_GPL(tee_client_invoke_func);
> >
> > +int tee_client_cancel_req(struct tee_context *ctx,
> > +                         struct tee_ioctl_cancel_arg *arg)
> > +{
> > +       if (!ctx->teedev->desc->ops->cancel_req)
> > +               return -EINVAL;
> > +       return ctx->teedev->desc->ops->cancel_req(ctx, arg->cancel_id,
> > +                                                 arg->session);
> > +}
> > +EXPORT_SYMBOL_GPL(tee_client_cancel_req);
> > +
> >  static int __init tee_init(void)
> >  {
> >         int rc;
> > diff --git a/include/linux/tee_drv.h b/include/linux/tee_drv.h
> > index 6cfe058..177016e 100644
> > --- a/include/linux/tee_drv.h
> > +++ b/include/linux/tee_drv.h
> > @@ -526,6 +526,18 @@ int tee_client_invoke_func(struct tee_context *ctx,
> >                            struct tee_ioctl_invoke_arg *arg,
> >                            struct tee_param *param);
> >
> > +/**
> > + * tee_client_cancel_req() - Request cancellation of the previous open-session
> > + * or invoke-command operations in a Trusted Application
> > + * @ctx:       TEE Context
> > + * @arg:       Cancellation arguments, see description of
> > + *             struct tee_ioctl_cancel_arg
> > + *
> > + * Returns < 0 on error else 0 if the cancellation was successfully requested.
> > + */
> > +int tee_client_cancel_req(struct tee_context *ctx,
> > +                         struct tee_ioctl_cancel_arg *arg);
> > +
> >  static inline bool tee_param_is_memref(struct tee_param *param)
> >  {
> >         switch (param->attr & TEE_IOCTL_PARAM_ATTR_TYPE_MASK) {
> > --
> > 2.7.4
> >
> Hi,
>
> Just gentle reminder - v2 patch has been sitting in ML for almost 2
> weeks with no review (all issues mentioned in v1 were addressed).
> If anyone has any objections/suggestions, please let me know.

Looks good. I'll pick it up.

Thanks,
Jens