[Qemu-devel] [PATCH 0/5] proposal to make hostmem listener RAM unplug safe

[Liu Ping Fan <qemulist@gmail.com>]

From: Liu Ping Fan <pingfank@linux.vnet.ibm.com>

This is an proposal similar to push core listener out of biglock
     for core listener out of biglock, 
     refer to orignal plan posted by Marcelo Tosatti,
     http://lists.gnu.org/archive/html/qemu-devel/2012-06/msg04315.html

While core listener's out of biglock still no driven use case, as to
HostMem listner, it is already out of biglock, we need to ensure it RAM
unplug safe.  Currently, to handle such issue, we need to call
bdrv_drain_all() in hostmem->commit(), while these patch fix this issue
with refcnt.

RAM_Device {
  int refcnt; ---> this is what we to inc/dec when hostmem_lookup()/"req cb"
....
  MemoryRegion mr;
}

For RAM hotunplug, please refer to Vasilis Liaskovitis's patches
   http://lists.gnu.org/archive/html/qemu-devel/2012-12/msg02693.html


Liu Ping Fan (5):
  memory: add ref/unref interface for MemroyRegionOps
  hostmem: make hostmem global and RAM hotunplg safe
  vring: use hostmem's RAM safe api
  virtio-blk: release reference to RAM's memoryRegion
  hostmem: init/finalize hostmem listener

 hw/dataplane/hostmem.c    |  130 +++++++++++++++++++++++++++++++-------------
 hw/dataplane/hostmem.h    |   19 ++-----
 hw/dataplane/virtio-blk.c |   52 ++++++++++++++----
 hw/dataplane/vring.c      |   88 ++++++++++++++++++++++--------
 hw/dataplane/vring.h      |    5 +-
 include/exec/memory.h     |   10 ++++
 include/qemu/main-loop.h  |    2 +
 memory.c                  |   18 ++++++
 vl.c                      |    2 +
 9 files changed, 235 insertions(+), 91 deletions(-)

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1.7.4.4