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

[Shannon Zhao <zhaoshenglong@xxxxxxxxxx>]

On 2015/8/11 23:52, Boris Ostrovsky wrote:
> On 08/11/2015 11:35 AM, Ian Campbell wrote:
>> 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.
> 
> This notifier calls PHYSDEVOP_pci_device_add and as far as I can tell
> MMIO is mapped there (for IOMMU, which IIUIC is the main issue here).

Right, at this moment we only add platform and amba bus bus_notifier.
The PCI device can reuse existing bus_notifier.

-- 
Shannon


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