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Re: [PATCH 04/10] [WORKAROUND] xen/arm: Update hwdom's p2m to trap ECAM space
- To: Oleksandr Andrushchenko <andr2000@xxxxxxxxx>
- From: Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Date: Wed, 11 Nov 2020 15:44:22 +0100
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On Mon, Nov 09, 2020 at 02:50:25PM +0200, Oleksandr Andrushchenko wrote:
> From: Oleksandr Andrushchenko <oleksandr_andrushchenko@xxxxxxxx>
>
> Host bridge controller's ECAM space is mapped into Domain-0's p2m,
> thus it is not possible to trap the same for vPCI via MMIO handlers.
> For this to work we need to unmap those mappings in p2m.
>
> TODO (Julien): It would be best if we avoid the map/unmap operation.
> So, maybe we want to introduce another way to avoid the mapping.
> Maybe by changing the type of the controller to "PCI_HOSTCONTROLLER"
> and checking if this is a PCI hostcontroller avoid the mapping.
I know very little about Arm to be able to provide meaningful comments
here. I agree that creating the maps just to remove them afterwards is
not the right approach, we should instead avoid those mappings from
being created in the first place.
Roger.
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