X-Git-Url: http://git.droids-corp.org/?p=dpdk.git;a=blobdiff_plain;f=doc%2Fguides%2Frel_notes%2Fknown_issues.rst;h=5fb7f834f84100b7709df32686166f26b5ccf2b5;hp=de0782136d3cc622840fe48eb5ab2c5253bc4214;hb=b37e95507e1bd77c25ce8dae947cdfdb0d5b3308;hpb=e2a1a08a763d8c20d4ac5a5be37eff88c1b9d9af

diff --git a/doc/guides/rel_notes/known_issues.rst b/doc/guides/rel_notes/known_issues.rst
index de0782136d..5fb7f834f8 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).