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Re: [Xen-devel] [PATCH] xen/arm: io: add function swap_mmio_handler()



On Mon, 24 Jun 2019, Julien Grall wrote:
> Hi,
> 
> On 6/24/19 9:17 PM, Stefano Stabellini wrote:
> > On Mon, 24 Jun 2019, Julien Grall wrote:
> > > Hi Stefano,
> > > 
> > > On 24/06/2019 19:27, Stefano Stabellini wrote:
> > > > On Mon, 24 Jun 2019, Stefano Stabellini wrote:
> > > > > On Thu, 13 Jun 2019, chenbaodong wrote:
> > > > Let me add that if you prefer to document one of the other interfaces
> > > > listed above in my email, you are welcome to pick another one. For
> > > > example, we are also missing a doc about the DomU memory map, listing
> > > > all memory regions with addresses and sizes, both MMIO and normal
> > > > memory. For that, most of the information is:
> > > > 
> > > > xen/include/public/arch-arm.h
> > > > 
> > > > A well written in-code comment in arch-arm.h would be OK, or also a
> > > > document under docs/misc/arm.
> > > 
> > > Please no duplication, it is already quite hard to maintain one place.
> > > Instead, we should document all the headers in a documented format that
> > > can be extracted automatically.
> > 
> > As we have no such thing today (as far as I am aware), please make a
> > proposal with a bit more details, otherwise I don't think Baodong will
> > be able to take the next step.
> 
> I don't have a concrete proposal so far. Except that documentation outside of
> the headers is a no-go from my side. The goal of documenting within the
> headers rather than outside is you also help the developer of guest OS.
> 
> A few weeks ago Ian Jackson pointed to docs/xen-headers for a potential
> syntax. Sadly, there are no documentation of the script so far. I haven't had
> time to look it so far.

In that case, I'd suggest for Baodong to either pick the device tree
documentation item (assuming you are OK with that one being under
docs/misc/arm) or just write a normal in-code comment in arch-arm.h for
the domU memory map not worrying about the format of the in-code comment
for now.

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