Re: [Xen-devel] PCI Passthrough ARM Design : Draft1

[Roger Pau Monné <roger.pau@xxxxxxxxxx>]

Hello,

El 16/06/15 a les 7.42, Manish Jaggi ha escrit:
[...]
>>>> Beware that the 1:1 mapping doesn't fit with the current guest memory
>>>> layout which is pre-defined at Xen build time. So you would also have
>>>> to make it dynamically or decide to use the same memory layout as the
>>>> host.
>>> If same layout as host used, would there be any issue?
>> I'm not sure that a 1:1 mapping is any different to the host layout. But
>> in any case, the host layout also doesn't match the guest layout, so it
>> has the same issues.
> There is a domctl on x86 DOMCTL_iomem_permission which looks doing the
> same thing as the map_mmio hypercall which I am proposing. I am not sure
> if it does a 1:1. Do you have more info on it?

No, this hypercall only sets the permissions of IO memory ranges, but
AFAICT it doesn't touch the p2m at all.

Roger.

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