[dpdk-dev] [PATCH 03/21] vhost: protect virtio_net device struct

[Maxime Coquelin]

On 09/07/2017 03:44 PM, Yuanhan Liu wrote:
> On Thu, Aug 31, 2017 at 11:50:05AM +0200, Maxime Coquelin wrote:
>> virtio_net device might be accessed while being reallocated
>> in case of NUMA awareness.
> 
>  From data path? data path won't be enabled until all are ready, which is
> at a stage after numa_realloc(). Or, am I miss something?

Right, I just thought that Qemu could add queues after enabling the
first ones.

Anyway, I removed this patch from the v2 I'm preparing.

Maxime
> 	--yliu
> 
>> This case might be theoretical,
>> but it will be needed anyway to protect vrings pages against
>> invalidation.
>>
>> The virtio_net devs are now protected with a readers/writers
>> lock, so that before reallocating the device, it is ensured
>> that it is not being referenced by the processing threads.
>>
>> Signed-off-by: Maxime Coquelin <maxime.coquelin at redhat.com>