[dpdk-dev] [RFC 06/10] vhost: register new regions with userfaultfd

[Maxime Coquelin <maxime.coquelin@redhat.com>]

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
---
 lib/librte_vhost/vhost_user.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/lib/librte_vhost/vhost_user.c b/lib/librte_vhost/vhost_user.c
index d93febbc3..1c75d8015 100644
--- a/lib/librte_vhost/vhost_user.c
+++ b/lib/librte_vhost/vhost_user.c
@@ -926,6 +926,28 @@ vhost_user_set_mem_table(struct virtio_net **pdev, struct VhostUserMsg *pmsg)
 			mmap_size,
 			alignment,
 			mmap_offset);
+
+		if (dev->postcopy_listening) {
+			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,
+						&reg_struct)) {
+				RTE_LOG(ERR, VHOST_CONFIG,
+						"Failed to register ufd for region %d: (ufd = %d) %s\n",
+						i, dev->postcopy_ufd,
+						strerror(errno));
+				continue;
+			}
+			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);
+		}
 	}
 
 	for (i = 0; i < dev->nr_vring; i++) {
-- 
2.17.1