[dpdk-stable] [PATCH v2 v16.11 LTS] vhost-user: fix deadlock in case of NUMA realloc
Kevin Traynor
ktraynor at redhat.com
Wed Apr 4 14:57:09 CEST 2018
On 03/28/2018 08:51 PM, Maxime Coquelin wrote:
> Virtqueue's access lock was recently introduced to protect
> the device against async changes.
>
> One problem with the v16.11 backport is that in case of NUMA
> reallocation, the device gets stuck because the old access_lock
> gets unlocked instead of its reallocated copy. On the next
> vhost-user message received, the thread keeps spinning on the
> lock, as it will never be unlocked.
>
Reviewed-by: Kevin Traynor <ktraynor at redhat.com>
> Fixes: ce3b23dc9296 ("vhost: protect active rings from async ring changes")
>
> Cc: stable at dpdk.org
>
> Tested-by: Kevin Traynor <ktraynor at redhat.com>
> Signed-off-by: Maxime Coquelin <maxime.coquelin at redhat.com>
> ---
> V2: remove debug changes squashed by mistake...
>
> lib/librte_vhost/vhost_user.c | 8 ++++++--
> 1 file changed, 6 insertions(+), 2 deletions(-)
>
> diff --git a/lib/librte_vhost/vhost_user.c b/lib/librte_vhost/vhost_user.c
> index 80348dbf6..94a48a4b0 100644
> --- a/lib/librte_vhost/vhost_user.c
> +++ b/lib/librte_vhost/vhost_user.c
> @@ -327,9 +327,11 @@ qva_to_vva(struct virtio_net *dev, uint64_t qva)
> * This function then converts these to our address space.
> */
> static int
> -vhost_user_set_vring_addr(struct virtio_net *dev, struct vhost_vring_addr *addr)
> +vhost_user_set_vring_addr(struct virtio_net **pdev,
> + struct vhost_vring_addr *addr)
> {
> struct vhost_virtqueue *vq;
> + struct virtio_net *dev = *pdev;
>
> if (dev->mem == NULL)
> return -1;
> @@ -348,6 +350,8 @@ vhost_user_set_vring_addr(struct virtio_net *dev, struct vhost_vring_addr *addr)
> }
>
> dev = numa_realloc(dev, addr->index);
> + *pdev = dev;
> +
> vq = dev->virtqueue[addr->index];
>
> vq->avail = (struct vring_avail *)(uintptr_t)qva_to_vva(dev,
> @@ -1092,7 +1096,7 @@ vhost_user_msg_handler(int vid, int fd)
> vhost_user_set_vring_num(dev, &msg.payload.state);
> break;
> case VHOST_USER_SET_VRING_ADDR:
> - vhost_user_set_vring_addr(dev, &msg.payload.addr);
> + vhost_user_set_vring_addr(&dev, &msg.payload.addr);
> break;
> case VHOST_USER_SET_VRING_BASE:
> vhost_user_set_vring_base(dev, &msg.payload.state);
>
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