From: Liu Ping Fan <pingf...@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(-)
--
1.7.4.4
