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Date:   Fri, 16 Oct 2020 14:10:47 +0530
From:   Sai Prakash Ranjan <>
To:     Leo Yan <>
Cc:     Denis Nikitin <>,
        Mathieu Poirier <>,,,, Stephen Boyd <>,,
        Mike Leach <>,
        Suzuki K Poulose <>
Subject: Re: [PATCH] coresight: etm4x: Add config to exclude kernel mode

Hi Leo,

On 2020-10-16 12:54, Leo Yan wrote:
> 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]

What happens to the sysfs mode of tracing? For that we would still
need a config right to exclude kernel mode tracing completely.


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