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<body><table border="1" cellspacing="0" cellpadding="8" class="bz_new_table">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_UNCONFIRMED "
title="UNCONFIRMED - Vhost multi-queue reconnection failed with QEMU version 4.2.0 to 5.1.0"
href="https://bugs.dpdk.org/show_bug.cgi?id=1658">1658</a>
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</tr>
<tr>
<th>Summary</th>
<td>Vhost multi-queue reconnection failed with QEMU version 4.2.0 to 5.1.0
</td>
</tr>
<tr>
<th>Product</th>
<td>DPDK
</td>
</tr>
<tr>
<th>Version</th>
<td>18.11
</td>
</tr>
<tr>
<th>Hardware</th>
<td>All
</td>
</tr>
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<th>OS</th>
<td>All
</td>
</tr>
<tr>
<th>Status</th>
<td>UNCONFIRMED
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>Normal
</td>
</tr>
<tr>
<th>Component</th>
<td>vhost/virtio
</td>
</tr>
<tr>
<th>Assignee</th>
<td>dev@dpdk.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>nandinipersad361@gmail.com
</td>
</tr>
<tr>
<th>Target Milestone</th>
<td>---
</td>
</tr></table>
<p>
<div class="bz_comment_block">
<pre class="bz_comment_text">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. QEMU-5.2.0 fixes this issue in commit f66337bdbfda
(“vhost-user: save features of multiqueues if chardev is closed”).
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).
</pre>
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