On 29/03/2017 10:37, Jason Wang wrote:
>>
>> diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c
>> index 03592c5..73e69ac 100644
>> --- a/hw/virtio/virtio.c
>> +++ b/hw/virtio/virtio.c
>> @@ -176,6 +176,10 @@ err_used:
>> address_space_cache_destroy(&new->desc);
>> err_desc:
>> g_free(new);
>> + atomic_rcu_set(&vq->vring.caches, NULL);
>> + if (old) {
>> + call_rcu(old, virtio_free_region_cache, rcu);
>> + }
>> }
>>
>> /* virt queue functions */
>>
>> Paolo
>
> This looks a good fix but may not solve this issue completely. Depends
> on the iova that guest uses, address_space_cache_init() may succeed even
> in this case since vtd does a passthrough translation in this case.
Can you explain this more?
Paolo
