Re: [Qemu-devel] [PATCH 0/3] pci: allow PCI bus slots to be marked as reserved

[Mark Cave-Ayland]

On 11/07/17 16:57, Michael S. Tsirkin wrote:

> On Tue, Jul 11, 2017 at 06:51:50PM +0300, Marcel Apfelbaum wrote:
>> On 11/07/2017 18:31, Michael S. Tsirkin wrote:
>>> On Fri, Jul 07, 2017 at 08:43:59AM +0100, Mark Cave-Ayland wrote:
>>>> For some machines it is impossible to plug devices into a particular PCI 
>>>> bus
>>>> slot, e.g. for a real Ultra 5 there are 2 PCI bridges attached to the root
>>>> bus behind which all devices must be plugged. Ignoring this rule will cause
>>>> problems with interrupt routing since the interrupt numbers are calculated
>>>> based upon PCI bridge id and secondary PCI bus slot id.
>>>>
>>>> This patchset adds a new dev_reserved_mask property to PCIBus which is a
>>>> bitmask used to indicate whether PCI bus slots are reserved, i.e. they 
>>>> cannot
>>>> be used for hot or cold plugging on a particular PCI bus.
>>>>
>>>> Signed-off-by: Mark Cave-Ayland <address@hidden>
>>>
>>
>> Hi Michael,
>>
>>> Could you please point me at series making use of this
>>> functionality?
>>
>> There is a discussion upstream, I am not aware of patches yet.
>>
>> https://lists.gnu.org/archive/html/qemu-devel/2017-07/msg00771.html
>>
>> Thanks,
>> Marcel
> 
> It is probably a good idea to defer merging this patchset
> until there's an agreement on how it will be used.

I have a local patchset that uses it, but it has been held up by the
on-going issues with the fw_cfg patchset upon which it is also dependent.

I will try and find some time this evening to rebase the patchset and
send it out as I am aware that freeze is coming up soon.


ATB,

Mark.