Messages in this thread | | | Date | Fri, 16 Oct 2020 15:24:01 +0800 | From | Leo Yan <> | Subject | Re: [PATCH] coresight: etm4x: Add config to exclude kernel mode tracing |
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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
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