On Wed, 11 May 2016 13:09:45 -0400, Tony Harminc wrote: > >The biggest reason to use VIO rather than the various alternatives >mentioned is that it is compatible. An existing application need know >nothing about it, and can be offered improved performance with no code >changes. In these days of large memory it may seem quaint, but it has >its place. > Compatible. I recall a time when IEBCOPY couldn't deal with VIO because IEBCOPY used EXCP V=R, but VIO relying on paging could accept only virtual addresses. (Surprisingly?) this was addressed in VIO (by a sort of reverse LRA/DAT?) rather than modifying IEBCOPY. I wonder what the cost, and whether nowadays IEBCOPY eschews EXCP V=R so it may run with AC=0.
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