Re: [Xen-devel] [PATCH] xen/arm: Implement domain_get_maximum_gpfn

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

On 02/07/14 12:31, Jan Beulich wrote:
>>>> On 02.07.14 at 12:19, <roger.pau@xxxxxxxxxx> wrote:
>> For PVH guests there's still no MMIO hole (or any other kind of hole) at
>> all, the hole(s) is only there for Dom0.
> 
> So where would passed through devices get their MMIO BARs located?
> (I realize pass-through isn't supported yet for PVH, but I didn't expect
> such fundamental things to be missing.)

We could always add a MMIO region to a PVH guest in backwards compatible
way, the only requirement is to make sure the e820 provided to the guest
has this hole set up, but I see no reason to add it before having this
functionality, or to add it unconditionally to guests even if no devices
are passed through.

Also, shouldn't PVH guests use pcifront/pciback, which means it won't
have any BARs mapped directly?

Roger.


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