Re: [PATCH v10 6/6] x86/split_lock: Enable split lock detection by kernel parameter

[Andy Lutomirski]

> On Nov 21, 2019, at 1:51 PM, Luck, Tony <tony.luck@xxxxxxxxx> wrote:
> 
> ïOn Thu, Nov 21, 2019 at 02:15:22PM +0100, Peter Zijlstra wrote:
>> Also, just to remind everyone why we really want this. Split lock is a
>> potent, unprivileged, DoS vector.
> 
> So how much do we "really want this"?
> 
> It's been 543 days since the first version of this patch was
> posted. We've made exactly zero progress.
> 
> Current cut down patch series is the foundation to move one
> small step towards getting this done.
> 
> Almost all of what's in this set will be required in whatever
> final solution we want to end up with. Out of this:

Why donât we beat it into shape and apply it, hidden behind BROKEN. Then we can work on the rest of the patches and have a way to test them.

It would be really, really nice if we could pass this feature through to a VM. Can we?