On Wed, Jun 14, 2017 at 5:40 AM, Brian Gerst <[email protected]> wrote: > Since tasks using IOPL are very rare, move the switching code to the slow > path for lower impact on normal tasks.
I think that Andrew Cooper added a vmassist that we could opt in to that makes Xen PV IOPL switching work more or less just like native. We could maybe opt in to that and avoid needing this stuff at all on newer hypervisors.
