Re: [Xen-devel] [PATCH v3 05/11] optee: add fast calls handling

[Julien Grall <julien.grall@xxxxxxx>]

On 17/01/2019 20:10, Volodymyr Babchuk wrote:
> Hi,
>
> Julien Grall writes:
>
> > Hi,
> >
> > On 1/17/19 7:22 PM, Volodymyr Babchuk wrote:
> > > Julien Grall writes:
> > >
> > > [...]
> > > > > Because mediator can't share one static SHM region with all guests,
> > > > > it just disables it for all.
> > > > I haven't seen an answer to my question on the previous version. For reminder:
> > > I'm sorry, I missed this somehow.
> > >
> > >
> > > > Would it make sense to still allow the hardware domain to access static SHM?
> > > Not really. If linux drivers sees that OP-TEE support dynamic SHM, it
> > > uses it by default. And all new versions of OP-TEE support dynamic SHM.
> > >
> > > So, it will add unnecessary code to enable feature which will not be used.
> > >
> > > But, actually, there is a caveat. Right now linux driver requires static SHM,
> > > even if it will not use it. I have submitted patch that fixes it, but
> > > it still not merged.
> > >
> > > So... what do you think? Should I add piece of code which is needed
> > > right now, but will not be used later?
> > I think it would be nice to have OP-TEE working in Dom0 with current
> > Linux. For the guest, we can require a more recent Linux if there are
> > no other solution.
> Okay, I'll take a look what can be done. Can I do this in a separate patch?
I am fine with that. Please mention it in the commit message though.

Cheers,

--
Julien Grall

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