On Mon, Jan 04, 2021 at 09:15:30PM +0800, Like Xu wrote: > When a guest counter is configured as a PEBS counter through > IA32_PEBS_ENABLE, a guest PEBS event will be reprogrammed by > configuring a non-zero precision level in the perf_event_attr. > > The guest PEBS overflow PMI bit would be set in the guest > GLOBAL_STATUS MSR when PEBS facility generates a PEBS > overflow PMI based on guest IA32_DS_AREA MSR. > > The attr.precise_ip would be adjusted to a special precision > level when the new PEBS-PDIR feature is supported later which > would affect the host counters scheduling. This seems like a random collection of changes, all required, but loosely related. > The guest PEBS event would not be reused for non-PEBS > guest event even with the same guest counter index. /me rolls eyes at the whole destroy+create nonsense...
