linux-kernel - Re: [PATCH v3 5/7] tee: Support shm registration without dma-buf backing

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Message-ID: <20210610210056.GO4910@sequoia>
Date:   Thu, 10 Jun 2021 16:00:56 -0500
From:   Tyler Hicks <tyhicks@...ux.microsoft.com>
To:     Jens Wiklander <jens.wiklander@...aro.org>
Cc:     Sumit Garg <sumit.garg@...aro.org>, Rijo-john.Thomas@....com,
        Allen Pais <apais@...ux.microsoft.com>,
        Peter Huewe <peterhuewe@....de>,
        Jarkko Sakkinen <jarkko@...nel.org>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Vikas Gupta <vikas.gupta@...adcom.com>,
        Thirupathaiah Annapureddy <thiruan@...rosoft.com>,
        Pavel Tatashin <pasha.tatashin@...een.com>,
        Rafał Miłecki <zajec5@...il.com>,
        op-tee@...ts.trustedfirmware.org,
        linux-integrity <linux-integrity@...r.kernel.org>,
        bcm-kernel-feedback-list@...adcom.com, linux-mips@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 5/7] tee: Support shm registration without dma-buf
 backing

On 2021-06-10 09:34:24, Jens Wiklander wrote:
> On Wed, Jun 09, 2021 at 08:51:04AM -0500, Tyler Hicks wrote:
> [snip]
> > > > I've just posted "[PATCH 0/7] tee: shared memory updates",
> > > > https://lore.kernel.org/lkml/20210609102324.2222332-1-jens.wiklander@linaro.org/
> > > > 
> > > > Where tee_shm_alloc() is replaced by among other functions
> > > > tee_shm_alloc_kernel_buf(). tee_shm_alloc_kernel_buf() takes care of the
> > > > problem with TEE_SHM_DMA_BUF.
> > > 
> > > Thanks! At first glance, that series would take care of the last three
> > > patches in my kexec/kdump series.
> > 
> > Correction: Your series would not completely take care of the last three
> > patches in my kexec/kdump series because your series doesn't implement
> > the .shutdown() hook for tee_bnxt_fw.
> > 
> > Does it make sense to take my series first and then rebase your series
> > on top of it? That would allow my fixes to flow back to stable, then
> > your changes would greatly clean up the implementation in future
> > releases.
> 
> Yes, we could try that. I'd like to see tee_shm_alloc_kernel_buf() being
> used instead of tee_shm_alloc() in ftpm_tee_probe() and
> tee_bnxt_fw_probe(). So it would be great if you could include "tee: add
> tee_shm_alloc_kernel_buf()" in your patch set.

That would be no problem at all. I like that idea and I've prepared a v4
with that change. I'll send it out shortly once I've finished testing.

> My patch set would then shrink a bit. By the way, thanks for reviewing
> it.

No problem! I feel like I'm starting to understand the TEE subsystem and
OP-TEE driver a bit so I'm happy to help out.

Tyler

> 
> Cheers,
> Jens
>