netdev - [PATCH 0/2] vhost/net: Clear the pending messages when the backend is removed

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Message-Id: <20230117151518.44725-1-eric.auger@redhat.com>
Date:   Tue, 17 Jan 2023 10:15:16 -0500
From:   Eric Auger <eric.auger@...hat.com>
To:     eric.auger.pro@...il.com, eric.auger@...hat.com, mst@...hat.com,
        jasowang@...hat.com, kvm@...r.kernel.org, netdev@...r.kernel.org,
        virtualization@...ts.linux-foundation.org
Cc:     peterx@...hat.com, lvivier@...hat.com
Subject: [PATCH 0/2] vhost/net: Clear the pending messages when the backend is removed

When the vhost iotlb is used along with a guest virtual iommu
and the guest gets rebooted, some MISS messages may have been
recorded just before the reboot and spuriously executed by
the virtual iommu after the reboot. This is due to the fact
the pending messages are not cleared.

As vhost does not have any explicit reset user API,
VHOST_NET_SET_BACKEND looks a reasonable point where to clear
the pending messages, in case the backend is removed (fd = -1).

This version is a follow-up on the discussions held in [1].

The first patch removes an unused 'enabled' parameter in
vhost_init_device_iotlb().

Best Regards

Eric

History:
[1] RFC: [RFC] vhost: Clear the pending messages on vhost_init_device_iotlb()
https://lore.kernel.org/all/20221107203431.368306-1-eric.auger@redhat.com/

Eric Auger (2):
  vhost: Remove the enabled parameter from vhost_init_device_iotlb
  vhost/net: Clear the pending messages when the backend is removed

 drivers/vhost/net.c   | 5 ++++-
 drivers/vhost/vhost.c | 5 +++--
 drivers/vhost/vhost.h | 3 ++-
 3 files changed, 9 insertions(+), 4 deletions(-)

-- 
2.31.1