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


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.


Julien Grall

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