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Re: [Qemu-devel] [PATCH 0/3] pci: allow PCI bus slots to be marked as re
From: |
Michael S. Tsirkin |
Subject: |
Re: [Qemu-devel] [PATCH 0/3] pci: allow PCI bus slots to be marked as reserved |
Date: |
Tue, 11 Jul 2017 18:57:54 +0300 |
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.
>
> > 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