linux-kernel - Re: [PATCH net] virtio-net: reject small vring sizes

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Message-ID: <AM0PR04MB472392318BC9A36CBA7AF19AD4669@AM0PR04MB4723.eurprd04.prod.outlook.com>
Date:   Sun, 23 Apr 2023 08:01:35 +0000
From:   Alvaro Karsz <alvaro.karsz@...id-run.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>
CC:     Jason Wang <jasowang@...hat.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "pabeni@...hat.com" <pabeni@...hat.com>,
        "virtualization@...ts.linux-foundation.org" 
        <virtualization@...ts.linux-foundation.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net] virtio-net: reject small vring sizes

We could add a new virtio_config_ops: peek_vqs.
We can call it during virtnet_validate, and then fixup the features in case of small vrings.

If peek_vqs is not implemented by the transport, we can just fail probe later in case of small vrings.