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

[Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>]

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?


-- 
Best regards,Volodymyr Babchuk
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