Re: Xen ARM small task (WAS: Re: [Xen Question])

[Julien Grall <julien.grall@arm.com>]

Hi Stefano,

On 11/11/2016 02:24, Stefano Stabellini wrote:
> On Thu, 10 Nov 2016, Julien Grall wrote:
>> (CC Stefano and change the title)
>>
>> Hello,
>>
>> On 10/11/16 12:13, casionwoo wrote:
>>> I’m pleased about your reply and you have a lot of code to clean-up.
>>>
>>> As you mentioned, It’s really huge to digest at once. Thank you for
>>> understanding me.
>>>
>>> And that’s why i need a small fix up and todo list.
>>>
>>> I feel familiar with ARM and c language and there’s no specific area yet.
>>>
>>> I think that i can find interesting area with following up the codes.
>>>
>>> I’m looking forward to being stuck on Xen.
>>>
>>> Then it would be easier for me to understand about Xen on ARM.
>>>
>>> Please let me know the TODO and bug-fix lists.
>>
>> Stefano, before giving a list of code clean-up, do you have any small TODO on
>> ARM in mind?
>
> A simple task we talked about recently is to enable the vuart
> (xen/arch/arm/vuart.c) for all guests. At the moment it is only emulated
> for Dom0, but some guests, in particular BareMetal guests
> (https://en.wikipedia.org/wiki/BareMetal), would benefit from it.
>
> It would be best to introduce an option in libxl to explicitly
> enable/disable the vuart for DomUs. Something like vuart=1 in the VM
> config file.

The vuart has not been enabled for DomU because it the UART region may 
clash with the guest memory layout (which is static).

I don't think this option should be available until we allow the guest 
to use the same memory layout as the host (see e820_host parameter for x86).

>
> BTW we should keep this up to date:
>
> https://wiki.xenproject.org/wiki/Xen_ARM_TODO

You are right, although it might be better to use the bug tracker [1] to 
stay aligned with the rest of the hypervisor.

Note that I have got a list of TODO/bugs I track myself but never 
updated the wiki.

Cheers,

[1] https://bugs.xenproject.org/xen/

-- 
Julien Grall

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