https://bugs.dpdk.org/show_bug.cgi?id=1658
Bug ID: 1658
Summary: Vhost multi-queue reconnection failed with QEMU
version 4.2.0 to 5.1.0
Product: DPDK
Version: 18.11
Hardware: All
OS: All
Status: UNCONFIRMED
Severity: normal
Priority: Normal
Component: vhost/virtio
Assignee: dev@dpdk.org
Reporter: nandinipersad...@gmail.com
Target Milestone: ---
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).
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