Re: [RFC PATCH 00/45] KVM: arm/arm64: Rework virtual GIC emulation

Marc Zyngier
2016-03-30T12:07:06Z

On 30/03/16 12:42, Vladimir Murzin wrote:
> On 29/03/16 14:12, Vladimir Murzin wrote:
>> Hi Andre,
>>
>> On 25/03/16 02:04, Andre Przywara wrote:
>>> Please have a look at the series, review it and give the code some
>>> serious testing (and possibly debugging). All feedback is appreciated.
>>
>> I see that with the new vgic implementation kvmtool starts throwing:
>>
>> kvm [1273]: Unable to register VGICv3 redist MMIO regions
>>
>
> It comes from kvm_io_bus_register_dev()
>
> if (bus->dev_count - bus->ioeventfd_count > NR_IOBUS_DEVS - 1)
> return -ENOSPC;
>
> with bus->dev_count being 1000

Ouch. That's a consequence of having one "device" per actual register
set, I believe. So either we bump this limit up by a factor 10 (at
least), or we switch back to the old way of handling access to the GIC
regions (big "catch-all", and further demuxing).

Thoughts?

Thanks,

M.
--
Jazz is not dead. It just smells funny...