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[Qemu-devel] [PATCH 0/3] run RCU callbacks within the iothread mutex, fi

From: Paolo Bonzini
Subject: [Qemu-devel] [PATCH 0/3] run RCU callbacks within the iothread mutex, fix PCI hotplug
Date: Wed, 11 Feb 2015 18:14:29 +0100

Patch 1 avoids that RCU callbacks are delayed forever if there's
scarcity of them, which is bad because qemu_opts_del will be called in
a RCU callbacks.

Patches 2 avoids complications due to instance_finalize callbacks that
are not thread-safe.  It's a big hammer and it is not handsome, but I
gave up on making VFIO list manipulations thread-safe.

Patch 3 avoids a use-after-free when freeing address spaces.

These patches survived several hundred hotplug cycles, with MALLOC_PERTURB_
and G_SLICE=always-malloc on.


Paolo Bonzini (3):
  rcu: do not let RCU callbacks pile up indefinitely
  rcu: run RCU callbacks under the BQL
  memory: keep the owner of the AddressSpace alive until

 memory.c       |  5 +++++
 tests/Makefile |  2 +-
 util/rcu.c     | 19 +++++++++++++------
 3 files changed, 19 insertions(+), 7 deletions(-)


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