On Thu, Oct 15, 2020 at 11:40:05PM -0700, Denis Nikitin wrote: > Hi Mathieu, > > I think one of the use cases could be VMs. > Is there isolation between EL1 guest kernels which we can control from perf > in a system wide mode? Sorry for suddenly jumping in. For KVM, I think we need to implement mechanism for saving/restoring CoreSight context for every guest OS, the CPU PMUs has implemented related features [1]. Thanks, Leo [1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/arm64/kvm/pmu.c
