Re: [Qemu-ppc] [RFC ppc-next PATCH 3/6] memory: add memory_region_to_address()

[Peter Maydell]

On 21 March 2013 11:49, Alexander Graf <address@hidden> wrote:
>
> On 21.03.2013, at 12:44, Peter Maydell wrote:
>> It is -- the device model is what calls kvm_arm_register_device().
>> It's just the mechanics of "how do we tell the kernel the right
>> address for this region at the point when we know it" that are
>> handled in kvm.c.
>
> I think I'm slowly grasping what you're aiming at :). Ok, that
> works. You do actually do the listener in the device model, just
> that you pass code responsibility over to kvm.c.
>
> That's perfectly valid and sounds like a good model that Scott
> probably wants to follow as well :).

Yep. We were actually originally going to make the device ioctl
a generic one, not an ARM one, because there really isn't anything
ARM specific about it. We should probably move the code from
target-arm/kvm.c into kvm-all.c with an arch hook to specify
the ioctl to use (same as irq_set_ioctl) if you want to do the
same approach with PPC.

Re multiple regions: yes, the VGIC has several. We just divide
the u32 ID into two halves, one for a device ID and one for
a region ID for that device.

-- PMM