On 03/10/2017 03:40, Ken Hofsass wrote: >> I'm also not sure about the debug_regs... > > In part for completeness but also to have them available in a > non-interactive debugging/instrumentation scenario, e.g. when using > KVM to support driver/kernel development work. Since you are removing the "enable" part, querying the capability with the "check extension" ioctl can return the supported register sets. If So we can extend sync_regs to debug registers in the future! I agree that regs, sregs and events should be present since the first revision. Paolo