[Qemu-devel] [PATCH 0/3] x86: ioapic: fix fail migrate when irqchip=split

[Peter Xu <peterx@redhat.com>]

Split irqchip works based on the fact that we kept the first 24 gsi
routing entries inside KVM for userspace ioapic's use. When system
boot, we'll reserve these MSI routing entries before hand. However,
after migration, we forgot to re-configure it up in the destination
side. The result is, we'll get invalid gsi routing entries after
migration (all empty), and we get interrupts with vector=0, then
strange things happen, like keyboard hang.

The solution is simple - we update them after migration, which is a
one line fix in patch 3.

The first two patches are things I used for debugging this issue.
Though it might not be directly related, I still think it's something
good to have in case we encounter similar interrupt issues in the
future.

Please review, thanks,

Peter Xu (3):
  x86: ioapic: add traces for ioapic
  x86: ioapic: dump version for "info ioapic"
  x86: ioapic: fix fail migration when irqchip=split

 hw/intc/ioapic.c        | 22 ++++++++++++++++++++--
 hw/intc/ioapic_common.c |  3 ++-
 hw/intc/trace-events    |  7 +++++++
 3 files changed, 29 insertions(+), 3 deletions(-)

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2.7.4