This patch added known issue for vhost multi-queue reconnection
with virtio-net/virtio-pmd.
Signed-off-by: Xuan Ding <xuan.d...@intel.com>
---
doc/guides/rel_notes/known_issues.rst | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)
diff --git a/doc/guides/rel_notes/known_issues.rst
b/doc/guides/rel_notes/known_issues.rst
index de0782136..3359cf063 100644
--- a/doc/guides/rel_notes/known_issues.rst
+++ b/doc/guides/rel_notes/known_issues.rst
@@ -888,3 +888,24 @@ Unsuitable IOVA mode may be picked as the default
**Driver/Module**:
ALL.
+
+Vhost multi-queue reconnection failed with QEMU version >= 4.2.0
+-------------------------------------------------
+
+**Description**
+ It's a QEMU regression bug (bad commit: c6beefd674ff). QEMU only saves
+ acked features for one vhost-net when vhost quits. When vhost reconnects
+ to virtio-net/virtio-pmd in multi-queue situations, the features been
+ set multiple times are not consistent.
+
+**Implication**
+ Vhost cannot reconnect back to virtio-net/virtio-pmd normally.
+
+**Resolution/Workaround**:
+ It is possible to filter the incorrect acked features at vhost-user side.
+
+**Affected Environment/Platform**:
+ ALL.
+
+**Driver/Module**:
+ Virtual Device Poll Mode Driver (PMD).
--
2.17.1
