[dpdk-dev] [PATCH v3 13/19] vhost: register new regions with userfaultfd
Maxime Coquelin
maxime.coquelin at redhat.com
Mon Oct 8 15:03:30 CEST 2018
On 10/05/2018 02:34 PM, Ilya Maximets wrote:
> On 04.10.2018 11:13, Maxime Coquelin wrote:
>> Signed-off-by: Dr. David Alan Gilbert <dgilbert at redhat.com>
>> Signed-off-by: Maxime Coquelin <maxime.coquelin at redhat.com>
>> ---
>> lib/librte_vhost/vhost_user.c | 33 ++++++++++++++++++++++++++++++++-
>> 1 file changed, 32 insertions(+), 1 deletion(-)
>>
>> diff --git a/lib/librte_vhost/vhost_user.c b/lib/librte_vhost/vhost_user.c
>> index ffb3ea60a..d61be2da6 100644
>> --- a/lib/librte_vhost/vhost_user.c
>> +++ b/lib/librte_vhost/vhost_user.c
>> @@ -968,6 +968,32 @@ vhost_user_set_mem_table(struct virtio_net **pdev, struct VhostUserMsg *msg,
>> mmap_size,
>> alignment,
>> mmap_offset);
>> +
>> + if (dev->postcopy_listening) {
>> +#ifdef RTE_LIBRTE_VHOST_POSTCOPY
>> + struct uffdio_register reg_struct;
>> +
>> + reg_struct.range.start = (uint64_t)(uintptr_t)mmap_addr;
>> + reg_struct.range.len = mmap_size;
>> + reg_struct.mode = UFFDIO_REGISTER_MODE_MISSING;
>> +
>> + if (ioctl(dev->postcopy_ufd, UFFDIO_REGISTER,
>> + ®_struct)) {
>> + RTE_LOG(ERR, VHOST_CONFIG,
>> + "Failed to register ufd for region %d: (ufd = %d) %s\n",
>> + i, dev->postcopy_ufd,
>> + strerror(errno));
>> + goto err_ufd;
>> + }
>> + RTE_LOG(INFO, VHOST_CONFIG,
>> + "\t userfaultfd registered for range : %llx - %llx\n",
>> + reg_struct.range.start,
>> + reg_struct.range.start +
>> + reg_struct.range.len - 1);
>> +#else
>> + goto err_ufd;
>> +#endif
>> + }
>> }
>>
>> for (i = 0; i < dev->nr_vring; i++) {
>> @@ -983,7 +1009,7 @@ vhost_user_set_mem_table(struct virtio_net **pdev, struct VhostUserMsg *msg,
>>
>> dev = translate_ring_addresses(dev, i);
>> if (!dev)
>> - goto err_mmap;
>> + goto err_ufd;
>>
>>
>> *pdev = dev;
>> @@ -994,6 +1020,11 @@ vhost_user_set_mem_table(struct virtio_net **pdev, struct VhostUserMsg *msg,
>>
>> return VH_RESULT_OK;
>>
>> +err_ufd:
>> + if (dev->postcopy_ufd >= 0) {
>> + close(dev->postcopy_ufd);
>> + dev->postcopy_ufd = -1;
>> + }
>
> It's unclear why we need to close postcopy_ufd here because this
> handler doesn't allocate it and postcopy_ufd should exist before
> calling this function.
> So, IMHO, we need to close it in all the VH_RESULT_ERR cases or
> leave it for later vhost_backend_cleanup().
Right, I agree this is vhost_backend_cleanup()'s job. I will remove it
from here.
>> err_mmap:
>> free_mem_region(dev);
>> rte_free(dev->mem);
>>
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