[PATCH v3 9/9] firmware: arm_scmi: Validate PCC shared memory signature

[Jonathan Cameron]

On Wed, 2 Sep 2026 09:25:19 +0100
Sudeep Holla <sudeep.holla at kernel.org> wrote:

> On Mon, Aug 24, 2026 at 01:24:50PM -0700, Jonathan Cameron wrote:
> > On Thu, 13 Aug 2026 12:33:04 +0100
> > Sudeep Holla <sudeep.holla at kernel.org> wrote:
> >   
> > > Validate the PCC shared memory signature when setting up an SCMI PCC
> > > channel.
> > > 
> > > Reject channels whose shared memory signature does not encode
> > > PCC_SIGNATURE combined with the PCC subspace ID, so misconfigured
> > > firmware is caught before the transport starts using the shared memory
> > > region.
> > > 
> > > Signed-off-by: Sudeep Holla <sudeep.holla at kernel.org>  
> > Interesting there aren't more checks on this in the various PCC users.
> > Question for another day perhaps.
> >   
> 
> Tried cleaning up all but some platforms like Hisilicon kunpeng complained
> it will break their platforms. So added a warning in the core but I want
> to enforce stricter check here for SCMI PCC.

Fair enough.  I'd be tempted to check in core and add a quirks list
for those broken platforms but meh, not my problem ;)


> 
> > Seems correct to me.
> > 
> > Reviewed-by: Jonathan Cameron <jonathan.cameron at oss.qualcomm.com>
> >   
> 
> Thanks!
>