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

[Julien Grall <julien.grall@xxxxxxx>]

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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