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Re: [RFC PATCH v5 02/26] vhost: Fix last queue index of devices with no
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From: |
Juan Quintela |
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Subject: |
Re: [RFC PATCH v5 02/26] vhost: Fix last queue index of devices with no cvq |
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Date: |
Tue, 02 Nov 2021 08:40:11 +0100 |
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User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/27.2 (gnu/linux) |
Eugenio Pérez <eperezma@redhat.com> wrote:
> The -1 assumes that all devices with no cvq have an spare vq allocated
> for them, but with no offer of VIRTIO_NET_F_CTRL_VQ. This may not be the
> case, and the device may have a pair number of queues.
>
> To fix this, just resort to the lower even number of queues.
>
> Fixes: 049eb15b5fc9 ("vhost: record the last virtqueue index for the
> virtio device")
> Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>