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

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Date:   Sun, 29 Jan 2023 18:58:09 +0100
From:   Eric Auger <eric.auger@...hat.com>
To:     eric.auger.pro@...il.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: Re: [PATCH 0/2] vhost/net: Clear the pending messages when the
 backend is removed

Hi,

On 1/17/23 16:15, Eric Auger wrote:
> 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().

Gentle Ping. Does it look a reasonable fix now?

Thanks

Eric
>
> 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(-)
>