Re: [RFC PATCH 00/16] x86/split_lock: Enable #AC exception for split locked accesses

[Dave Hansen]

On 05/29/2018 10:25 AM, Fenghua Yu wrote:
> (By the way, ISE and SDM don't mention other important details, e.g. 
> the fact that operand is fetched to cache before split lock is
> checked. Without the fact, it's hard to explain that only split lock
> generates bus lock in chapter 8.1.4 in SDM vol3.)

That's a bummer.  You're working with the folks that own those documents
to get that fixed up, right?

> Maybe I can add "Current TEST_CTL implementation is per-core. The patches
> are supposed to work even when TEST_CTL is per-thread (or even per-
> socket) in future as well."?

Yes, that would be a very important part of the software implementation
to mention.