[PATCH] coresight: etm4x: Add config to exclude kernel mode tracing
Leo Yan
leo.yan at linaro.org
Fri Oct 16 03:24:01 EDT 2020
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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