On Wed, Apr 07, 2021 at 11:05:20AM +0800, Liuxiangdong (Aven, Cloud Infrastructure Service Product Dept.) wrote: > > > On 2021/4/6 20:47, Andi Kleen wrote: > > > 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. > Sorry. Some questions about "Pin the whole guest". Do you mean VmPin equals > VmSize > in "/proc/$(pidof qemu-kvm)/status"? Or just VmLck equals VmSize? Or > something else? Either would be sufficient. All that matters is that the EPT pages don't get unmapped ever while PEBS is active. -Andi
