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doc: fix vhost multi-queue reconnection

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Since QEMU 5.2.0 fixes the vhost split ring multi-queue reconnection
issue in commit f66337bdbfda ("vhost-user: save features of multiqueues
if chardev is closed"), this patch updates known issue to indicate
the range of affeacted QEMU versions.

Fixes: b37e95507e ("doc: add vhost multi-queue reconnection issue")
Cc: stable@dpdk.org

Signed-off-by: Xuan Ding <xuan.ding@intel.com>
Reviewed-by: Chenbo Xia <chenbo.xia@intel.com>
This commit is contained in:
Xuan Ding 2022-05-09 04:11:58 +00:00 committed by Maxime Coquelin
parent 2d47fd3dfb
commit 5d4a6a4370
1 changed files with 4 additions and 3 deletions
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7
doc/guides/rel_notes/known_issues.rst
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@ -885,14 +885,15 @@ Unsuitable IOVA mode may be picked as the default
**Driver/Module**:
ALL.
Vhost multi-queue reconnection failed with QEMU version >= 4.2.0
----------------------------------------------------------------
Vhost multi-queue reconnection failed with QEMU version 4.2.0 to 5.1.0
----------------------------------------------------------------------
**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.
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.