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Re: [Qemu-devel] [PATCH 0/2] dataplane: fix start/stop races

From: tu bo
Subject: Re: [Qemu-devel] [PATCH 0/2] dataplane: fix start/stop races
Date: Wed, 30 Mar 2016 11:04:40 +0800
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.4.0

Hi Christian:

On 03/30/2016 12:31 AM, Christian Borntraeger wrote:
On 03/29/2016 03:42 PM, Michael S. Tsirkin wrote:
This works around races that data plane introduces
simply by exiting immediately if we detect
that dataplane is active.

It's a small but ugly patch, it's only justification
is that it's minimally intrusive, and that it clearly
has no chance to break non data plane users.

The idea is to rework it all post 2.6.

Michael S. Tsirkin (2):
   virtio: add aio handler
   virtio-blk: use aio handler for data plane

  include/hw/virtio/virtio-blk.h  |  2 ++
  include/hw/virtio/virtio.h      |  4 ++++
  hw/block/dataplane/virtio-blk.c | 13 +++++++++++++
  hw/block/virtio-blk.c           | 28 ++++++++++++++++++----------
  hw/virtio/virtio.c              | 36 ++++++++++++++++++++++++++++++++----
  5 files changed, 69 insertions(+), 14 deletions(-)

This also seems to help on my setup.Tu Bo, would be good if you
can double check this patch set as well on your setup?

With qemu master +  [PATCH 0/2] dataplane: fix start/stop races,

I did NOT see any crash, result is good in my box. thanks


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