On 14/08/14 17:43, Tian, Kevin wrote:

but doing so just moves from one incomplete solution (where read-modify-write is not treated as read-violation) to another incomplete solution (where all writes are treated read-violation). If there’s actual usage relying on accurate read-violation information, either solution doesn’t work. So I don’t see the value of this change.

I would agree.  Anything using this information will have to have detailed knowledge of what the hardware is capable of reporting, to understand the information it has to hand.

I think Xen should faithfully pass on what hardware reports.  It will be more useful to the consumer than blurring the details like this.

~Andrew