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Subject: Re: [virtio-dev] Clarification of VIRTIO_F_EVENT_IDX driver conditions.
On Thu, Jun 16, 2022 at 01:53:38PM -0700, Patrick Mosca wrote: > The issue may trigger in the unlikely uint16_t overflow case of > computing the difference between two index positions. Are you sure this is not an implementation bug? I don't see anywhere in the spec where we suggest computing the difference between two index positions. > An > example would be a network driver where the host and guest are > producing and consuming steadily but at different rates. The > producer is producing faster than the consumer such that the > consumer never needed to be notified of new events, as it is > still playing catch up processing the queue. If the producer > finally catches up to the consumer and the catchup occurs just > past the overflow point, there exists a case where a > notification must be sent but is not sent according to the > current ruleset. > > -Patrick Mosca I don't see it sorry. Example? -- MST
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