Il 20/09/2013 16:57, Paolo Bonzini ha scritto: > This series fixes hot-unplug of virtio devices, which can crash due to > dangling pointer accesses. > > The current implementation supports guest-initiated hot-unplug via the > virtio_bus_destroy_device function, but not hot-unplugging the virtio > device by virtue of unplugging its parent container device. > > The problem is that the callback for the bus implementation to cleanup > is placed in the wrong place; it is in virtio_bus_destroy_device, which > should be called by the bus, instead of being somewhere in device code. > We need to have the callback in device code (for example in dc->exit), > so that we invoke it on every unplug action, no matter who starts it. > > Thus, the series cleans up plugging and unplugging of virtio devices > so that it does not need any help from the bus (patches 1-4). It then > stops the virtio devices' overriding of dc->exit, moving their cleanup > code to the new exit callback in VirtioDeviceClass (patches 5-10). > Finally, patch 11 can make virtio-pci implement the device_unplugged > callback. > > Something similar is probably needed in virtio-ccw too. However, > virtio-ccw needs more surgery because it does not include a device_plugged > callback either, so I did not touch it.
Michael, I prepared a rebase of http://permalink.gmane.org/gmane.comp.emulators.qemu/225985 on top of these patches and sent it to Andreas. My understanding is that he will send them to qemu-devel. Let me know if you want to handle these patches yourself, or I can send a pull request for both directly with your Acked-bys. As to review, I think it can be usefully split as follows: - 4-10 for Andreas - 3 for Alex - 2 11 for you - 1 for either you or Andreas Paolo > > Paolo Bonzini (11): > virtio-bus: remove vdev field > virtio-pci: remove vdev field > virtio-ccw: remove vdev field > virtio-bus: cleanup plug/unplug interface > virtio-blk: switch exit callback to VirtioDeviceClass > virtio-serial: switch exit callback to VirtioDeviceClass > virtio-net: switch exit callback to VirtioDeviceClass > virtio-scsi: switch exit callback to VirtioDeviceClass > virtio-balloon: switch exit callback to VirtioDeviceClass > virtio-rng: switch exit callback to VirtioDeviceClass > virtio-pci: add device_unplugged callback > > hw/block/virtio-blk.c | 10 ++-- > hw/char/virtio-serial-bus.c | 10 ++-- > hw/net/virtio-net.c | 11 ++-- > hw/s390x/virtio-ccw.c | 80 +++++++++++++++------------ > hw/s390x/virtio-ccw.h | 1 - > hw/scsi/vhost-scsi.c | 11 ++-- > hw/scsi/virtio-scsi.c | 15 +++-- > hw/virtio/virtio-balloon.c | 10 ++-- > hw/virtio/virtio-bus.c | 81 +++++++++++++++------------ > hw/virtio/virtio-mmio.c | 9 +-- > hw/virtio/virtio-pci.c | 119 > ++++++++++++++++++++++++---------------- > hw/virtio/virtio-pci.h | 1 - > hw/virtio/virtio-rng.c | 10 ++-- > hw/virtio/virtio.c | 7 ++- > include/hw/virtio/virtio-bus.h | 22 +++++--- > include/hw/virtio/virtio-scsi.h | 2 +- > include/hw/virtio/virtio.h | 1 + > 17 files changed, 223 insertions(+), 177 deletions(-) >
