Re: [RFC v2 00/27] Kernel Address Space Isolation

[Peter Zijlstra]

On Fri, Jul 12, 2019 at 02:17:20PM +0200, Alexandre Chartre wrote:
> On 7/12/19 1:44 PM, Peter Zijlstra wrote:

> > AFAIK3 this wants/needs to be combined with core-scheduling to be
> > useful, but not a single mention of that is anywhere.
> 
> No. This is actually an alternative to core-scheduling. Eventually, ASI
> will kick all sibling hyperthreads when exiting isolation and it needs to
> run with the full kernel page-table (note that's currently not in these
> patches).
> 
> So ASI can be seen as an optimization to disabling hyperthreading: instead
> of just disabling hyperthreading you run with ASI, and when ASI can't preserve
> isolation you will basically run with a single thread.

You can't do that without much of the scheduler changes present in the
core-scheduling patches.