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Date:   Fri, 16 Oct 2020 15:24:01 +0800
From:   Leo Yan <>
To:     Denis Nikitin <>
Cc:     Mathieu Poirier <>,
        Sai Prakash Ranjan <>,,,, Stephen Boyd <>,,
        Mike Leach <>
Subject: Re: [PATCH] coresight: etm4x: Add config to exclude kernel mode

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].



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