Hi,

the vring_size() formula in section 2.3 seems to miss

(a) "vring_avail.used_event" in the first ALIGN(), and

(b) "vring_used.flags", "vring_used.idx", "vring_used.avail_event" in
the second ALIGN().

vring_size() in Appendix A fixes (b) (no rounding up to page size
though), but (a) is wrong there too, I believe.

Thanks,
Laszlo
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