Re: [PATCH v2 8/9] qemu: Enable SCHED_CORE for domains and helper processes

On Mon, Jun 27, 2022 at 12:44:40PM +0200, Michal Privoznik wrote: > Despite all mitigations, side channel attacks when two processes > run at two Hyper Threads of the same core are still possible. > Fortunately, the Linux kernel came up with a solution: userspace > can create so called trusted groups, which are sets of processes > and only processes of the same group can run on sibling Hyper > Threads. Of course, two processes of different groups can run on > different cores, because there's no known side channel attack. > It's only Hyper Threads that are affected. The next patch deals with helper processes too. I guess the difference in this patch is that it deals with helper processes spawned /after/ QEMU, so they can inherit scheduling group at startup easily, while the next patch has to apply the group later in startup ?