Re: [RFC PATCH 12/12] virtio: guarantee a virtqueue can publish its first descriptor chain

On 8/9/26 3:41 PM, Michael S. Tsirkin wrote:
> On Sun, Aug 09, 2026 at 06:20:10PM +0000, Alexander Graf wrote:
>> A device's pool is shared by every virtqueue it has and nothing
>> partitions it between them, so a virtqueue that asks late can get
>> nothing at all. virtnet_open() pre-fills the receive queues in index
>> order and discards the result, and a queue that came up with nothing is
>> one the device cannot signal a completion on.
>>
>> Withhold a range of the pool from ordinary claims and let a virtqueue
>> whose ring is empty draw on it for one descriptor chain.
> Why bother? one chain can just go inline in the ring.

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