On Wed, 07 Oct 2015 14:20:28 +0530 "Aneesh Kumar K.V" <aneesh.ku...@linux.vnet.ibm.com> wrote:
> Stefan Hajnoczi <stefa...@gmail.com> writes: > > > On Mon, Oct 05, 2015 at 11:07:23AM +0200, Greg Kurz wrote: > >> If the user tries to hot unplug a virtio-9p device, it seems to succeed but > >> in fact: > >> - virtio-9p coroutines thread pool and async queue are leaked > >> - QEMU crashes in virtio_vmstate_change() if the user tries to live migrate > >> > >> This patch brings hot unplug support to virtio-9p-device. It fixes both > >> above issues. > >> > >> Signed-off-by: Greg Kurz <gk...@linux.vnet.ibm.com> > >> --- > >> hw/9pfs/virtio-9p-device.c | 12 ++++++++++++ > >> 1 file changed, 12 insertions(+) > > > > What happens to in-flight I/O requests? We cannot assume that the guest > > driver quiesces the device. > > We enable migration blocker when we have an active mount. So if we get > here, that should indicate no active 9p mounts. > > -aneesh Oops.. Stefan is talking about hot-unplug versus in-flight requests... not about migration. And there is no such thing as a hot-unplug blocker... -- Greg
