linux-kernel - Re: [EXT] Re: [PATCH v2 0/1] tee: Add tee_shm_register

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Date:   Thu, 8 Sep 2022 09:18:43 +0000
From:   Olivier Masse <olivier.masse@....com>
To:     "sumit.garg@...aro.org" <sumit.garg@...aro.org>
CC:     "sumit.semwal@...aro.org" <sumit.semwal@...aro.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linaro-mm-sig@...ts.linaro.org" <linaro-mm-sig@...ts.linaro.org>,
        "christian.koenig@....com" <christian.koenig@....com>,
        "linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
        Clément Faure <clement.faure@....com>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "jens.wiklander@...aro.org" <jens.wiklander@...aro.org>,
        "op-tee@...ts.trustedfirmware.org" <op-tee@...ts.trustedfirmware.org>,
        "etienne.carriere@...aro.org" <etienne.carriere@...aro.org>
Subject: Re: [EXT] Re: [PATCH v2 0/1] tee: Add tee_shm_register_fd

Hi Sumit

On ven., 2022-08-19 at 13:54 +0530, Sumit Garg wrote:
> Caution: EXT Email
> 
> Hi Olivier,
> 
> On Fri, 12 Aug 2022 at 20:01, Olivier Masse <olivier.masse@....com>
> wrote:
> > 
> > Add a new ioctl called TEE_IOC_SHM_REGISTER_FD to register a
> > shared memory from a dmabuf file descriptor.
> > This new ioctl will allow the Linux Kernel to register a buffer
> > to be used by the Secure Data Path OPTEE OS feature.
> > 
> > Please find more information here:
> > 
https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fstatic.linaro.org%2Fconnect%2Fsan19%2Fpresentations%2Fsan19-107.pdf&amp;data=05%7C01%7Colivier.masse%40nxp.com%7C05071ff1c28044ab740908da81bc44e2%7C686ea1d3bc2b4c6fa92cd99c5c301635%7C0%7C1%7C637964942860947359%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&amp;sdata=nYLb2iMoJExdKEg4CL4eW5%2FQ%2Bqqj4Iw1TxFsd1UqWW0%3D&amp;reserved=0
> > 
> > Patch tested on Hikey 6220.
> > 
> 
> AFAIU, for the OP-TEE SDP feature to work you need to have a DMA-BUF
> heap driver for allocating secure buffers through exposed chardev:
> "/dev/dma_heap/sdp". Have you tested it with some out-of-tree driver
> as I can't find it upstream? Also, do you plan to push that upstream
> as well?

It has been tested with linaro,secure-heap reserved dma heap memory
which is also in review for upstream.

> 
> BTW, please add a changelog while sending newer patch-set versions.
> 
> -Sumit
> 
> > Etienne Carriere (1):
> >   tee: new ioctl to a register tee_shm from a dmabuf file
> > descriptor
> > 
> >  drivers/tee/tee_core.c   | 38 +++++++++++++++
> >  drivers/tee/tee_shm.c    | 99
> > +++++++++++++++++++++++++++++++++++++++-
> >  include/linux/tee_drv.h  | 11 +++++
> >  include/uapi/linux/tee.h | 29 ++++++++++++
> >  4 files changed, 175 insertions(+), 2 deletions(-)
> > 
> > --
> > 2.25.0
> >