"H. Peter Anvin" <h...@zytor.com> writes: > On 03/27/2013 04:25 AM, Michael S. Tsirkin wrote: >> >> Aha. Yes, good idea. As for how large the offsets are, >> I am guessing we should either just say offset is vqn * X and data is >> vqn, or give hypervisors full flexibility with 32 bit offset and >> arbitrary data. >> 16 bit offsets seem neither here nor there ... > > Shift count?
You can only have 2^16 vqs per device. Is it verboten to write 16-bit values to odd offsets? If so, we've just dropped it to 2^15 before you have to do some decoding to do. Hard to care... I dislike saying "multiply offset by 2" because implementations will get it wrong. That's because 0 will work either way, and that's going to be the common case. Cheers, Rusty. _______________________________________________ Virtualization mailing list Virtualization@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/virtualization
