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

[Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>]

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).
-boris

> > > > >    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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> > http://lists.xen.org/xen-devel

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