New upstream version 17.11-rc3

[deb_dpdk.git] / doc / guides / nics / virtio.rst

diff --git a/doc/guides/nics/virtio.rst b/doc/guides/nics/virtio.rst
index 4d6a837..af82f86 100644 (file)
--- a/doc/guides/nics/virtio.rst
+++ b/doc/guides/nics/virtio.rst
@@ -291,6 +291,13 @@ interrupt, Rx interrupts, and Tx interrupts. Config interrupt is used for
 notification of device configuration changes, especially link status (lsc).
 Interrupt mode is translated into Rx interrupts in the context of DPDK.
 
+.. Note::
+
+   Virtio PMD already has support for receiving lsc from qemu when the link
+   status changes, especially when vhost user disconnects. However, it fails
+   to do that if the VM is created by qemu 2.6.2 or below, since the
+   capability to detect vhost user disconnection is introduced in qemu 2.7.0.
+
 Prerequisites for Rx interrupts
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~