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[Qemu-devel] [PATCH 0/7] virtio-blk: use alias properties in transport d
From: |
Stefan Hajnoczi |
Subject: |
[Qemu-devel] [PATCH 0/7] virtio-blk: use alias properties in transport devices |
Date: |
Wed, 21 May 2014 22:22:45 +0200 |
Thanks for the feedback on the RFC. This time around the alias property is
implemented at the QOM property level instead of at the qdev property level.
The virtio transport/device split is broken as follows:
1. The virtio-blk device is never finalized because the transport devices
(virtio-blk-pci and friends) leak the refcount.
2. If we fix the refcount leak then we double-free the 'serial' string property
upon hot unplug since its char* is copied into the virtio-blk device which
has an identical 'serial' qdev property.
This series solves both of these problems as follows:
1. Introduce a QOM alias property that lets the transport device forward
property accesses into the virtio device (the child).
2. Use alias properties in transport devices, instead of keeping a duplicate
copy of the VirtIOBlkConf struct.
3. Fix the virtio-blk device refcount leak. It's now safe to do this since the
double-free has been resolved.
Stefan Hajnoczi (7):
qom: add object_property_add_alias()
virtio-blk: avoid qdev property definition duplication
virtio-blk: move x-data-plane qdev property to virtio-blk.h
virtio-blk: use aliases instead of duplicate qdev properties
virtio-blk: drop virtio_blk_set_conf()
virtio: fix virtio-blk child refcount in transports
virtio-blk: move qdev properties into virtio-blk.c
hw/block/virtio-blk.c | 42 ++++++++++++++++++++++++++++------
hw/s390x/s390-virtio-bus.c | 10 ++------
hw/s390x/s390-virtio-bus.h | 1 -
hw/s390x/virtio-ccw.c | 7 ++----
hw/s390x/virtio-ccw.h | 1 -
hw/virtio/virtio-pci.c | 7 ++----
hw/virtio/virtio-pci.h | 1 -
include/hw/virtio/virtio-blk.h | 19 +--------------
include/qom/object.h | 18 +++++++++++++++
qom/object.c | 52 ++++++++++++++++++++++++++++++++++++++++++
10 files changed, 112 insertions(+), 46 deletions(-)
--
1.9.0