[Qemu-devel] [PATCH 0/6] move interrupts from spapr to xics

[Alexey Kardashevskiy]

The existing interrupt allocation scheme in SPAPR assumes that
interrupts are allocated at the start time, continously and the config
will not change. However, there are cases when this is not going to work
such as:

1. migration - we will have to have an ability to choose interrupt
numbers for devices in the command line and this will create gaps in
interrupt space.

2. PCI hotplug - interrupts from unplugged device need to be returned
back to interrupt pool, otherwise we will quickly run out of interrupts if
we do PCI hotplug often.

First this was posted as "[PATCH 0/8] spapr: fix IOMMU and XICS/IRQs migration"
but since then we decided to migrate IOMMU in a different way and now it just
about interrupts.

This is also going to be used in spapr_pci's ibm,change-msi callback
to release interrupts and reallocate them again. At the moment spapr_pci
keeps a map of what it allocated for what device and it would be nice
to get rid of that mapping too and use this patchset instead.

Please comment. Thanks!


Alexey Kardashevskiy (6):
  xics: add flags for interrupts
  xics: add find_server
  xics: disable flags reset on xics reset
  spapr: move interrupt allocator to xics
  spapr: remove @next_irq
  xics: implement xics_ics_free()

 hw/intc/xics.c         | 150 +++++++++++++++++++++++++++++++++++++++++++++----
 hw/intc/xics_kvm.c     |   9 +--
 hw/ppc/spapr.c         |  70 +----------------------
 hw/ppc/spapr_events.c  |   2 +-
 hw/ppc/spapr_pci.c     |   6 +-
 hw/ppc/spapr_vio.c     |   2 +-
 include/hw/ppc/spapr.h |  11 ----
 include/hw/ppc/xics.h  |   9 ++-
 trace-events           |   6 ++
 9 files changed, 162 insertions(+), 103 deletions(-)

-- 
1.8.4.rc4