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

["Michael S. Tsirkin" <mst@redhat.com>]

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 <mark.cave-ayland@ilande.co.uk>
> > 
> 
> 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.


> 
> > Thanks!
> > 
> > > 
> > > Mark Cave-Ayland (3):
> > >    pci: move check for existing devfn into new pci_bus_devfn_available()
> > >      helper
> > >    pci: add dev_reserved_mask property to PCIBus
> > >    pci: add reserved slot check to do_pci_register_device()
> > > 
> > >   hw/pci/pci.c             |   34 ++++++++++++++++++++++++++++++----
> > >   include/hw/pci/pci_bus.h |    1 +
> > >   2 files changed, 31 insertions(+), 4 deletions(-)
> > > 
> > > -- 
> > > 1.7.10.4