> AFAIK， Icelake supports adaptive PEBS and extended PEBS which Skylake > doesn't. > But we can still use IA32_PEBS_ENABLE MSR to indicate general-purpose > counter in Skylake. > Is there anything else that only Icelake supports in this patches set? Only Icelake server has the support for recovering from a EPT violation on the PEBS data structures. To use it on Skylake server you would need to pin the whole guest, but that is currently not done. > Besides, we have tried this patches set in Icelake. We can use pebs(eg: > "perf record -e cycles:pp") > when guest is kernel-5.11, but can't when kernel-4.18. Is there a minimum > guest kernel version requirement? You would need a guest kernel that supports Icelake server PEBS. 4.18 would need backports for tht. -Andi
