Re: Design doc of adding ACPI support for arm64 on Xen - version 2

[Ian Campbell <ian.campbell@citrix.com>]

On Tue, 2015-08-11 at 11:29 -0400, Boris Ostrovsky wrote:
> On 08/11/2015 10:21 AM, Ian Campbell wrote:
> > On Tue, 2015-08-11 at 15:19 +0100, Ian Campbell wrote:
> > > On Fri, 2015-08-07 at 10:11 +0800, Shannon Zhao wrote:
> > > > This document is going to explain the design details of Xen booting
> > > > with
> > > > ACPI on ARM. Maybe parts of it may not be appropriate. Any comments 
> > > > are
> > > > welcome.
> > > Some small subsets of this seem like they might overlap with what 
> > > will be
> > > required for PVH on x86 (a new x86 guest mode not dissimilar to the 
> > > sole
> > > ARM guest mode). If so then it would be preferable IMHO if PVH x86 
> > > could
> > > use the same interfaces.
> > > 
> > > I've trimmed the quotes to just those bits and CCd some of the PVH 
> > > people
> > > (Boris and Roger[0]) in case they have any thoughts.
> > > 
> > > Actually, having done the trimming there is only one such bit:
> > > 
> > > [...]
> > > > 4. Map MMIO regions
> > > > -------------------
> > > > Register a bus_notifier for platform and amba bus in Linux.
> > Previously PCI was included in this scheme, which is why I thought of 
> > PVH,
> > having missed that PCI wasn't mentioned here now.
> > 
> > Is it handled some other way now or is that just an accidental 
> > omission?
> 
> PCI already has a bus notifier which is probably why it's not explicitly 
> called out here.

Right, but I was more specifically thinking of the bit which followed
regarding the use of the notifier to map the MMIO, which is the more
important bit.

> 
> > > >   Add a new
> > > > XENMAPSPACE "XENMAPSPACE_dev_mmio". Within the register, check if 
> > > > the
> > > > device is newly added, then call hypercall XENMEM_add_to_physmap to 
> > > > map
> > > > the mmio regions.
> > > Ian.
> > > 
> > > [0] Roger is away for a week or so, but I'm expect feedback to be of 
> > > the
> > > "we could use one extra field" type rather than "this needs to be 
> > > done
> > > some
> > > totally different way for x86/PVH" (in which case we wouldn't want to
> > > share
> > > the interface anyway I suppose) so need to block on awaiting that
> > > feedback.
> 
> 
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