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

[Boris Ostrovsky <boris.ostrovsky@oracle.com>]

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.

-borsi

>
>>>   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.