On 12/10/21 20:25, Jim Mattson wrote:
In the long run, I'd like to be able to override this system-wide setting on a per-VM basis, for VMs that I trust. (Of course, this implies that I trust the userspace process as well.) How would you feel if we were to add a kvm ioctl to override this setting, for a particular VM, guarded by an appropriate permissions check, like capable(CAP_SYS_ADMIN) or capable(CAP_SYS_MODULE)?
What's the rationale for guarding this with a capability check? IIRC you don't have such checks for perf_event_open (apart for getting kernel addresses, which is not a problem for virtualization).
Paolo
