PAPR has its own PCI hotplug mechanism which we implemented quite a
while ago. However, we weren't able to hotplug devices under PCI
bridges, because the pci-bridge code would try to handle the hotplug
using SHPC which won't work with PAPR.
We now have the infrastructure in the hotplug core to have the machine
take control of the hotplug before the bus tries to claim it, which
lets us address this. While we're about it, make a bunch of cleanups
and also allow hot plug of P2P bridges themselves (this turns out to
be quite straightforward once the rest is in place).
For now, we don't support hot unplug of bridges - this seems to cause
problems, at least for a Linux guest. I suspect the problem is on the
guest side, but for now just prohibit until we have time to
investigate properly.
Changes since v1:
* Added proper cover letter
* Addressed some minor comments
David Gibson (8):
spapr: Clean up device node name generation for PCI devices
spapr: Clean up device tree construction for PCI devices
spapr: Clean up dt creation for PCI buses
spapr: Clean up spapr_drc_populate_dt()
spapr: Clean up DRC index construction
spapr: Don't use bus number for building DRC ids
spapr: Direct all PCI hotplug to host bridge, rather than P2P bridge
spapr: Allow hot plug/unplug of PCI bridges and devices under PCI
bridges
hw/ppc/spapr.c | 25 +-
hw/ppc/spapr_drc.c | 13 +-
hw/ppc/spapr_pci.c | 486 ++++++++++++++++++++++--------------
include/hw/pci-host/spapr.h | 4 +-
include/hw/ppc/spapr_drc.h | 3 +-
5 files changed, 327 insertions(+), 204 deletions(-)
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2.21.0
