linux-kernel - Re: [PATCH 00/13] Tracefs support for pKVM

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Message-ID: <Z32gxHCt363ye1Vv@google.com>
Date: Tue, 7 Jan 2025 21:46:44 +0000
From: Vincent Donnefort <vdonnefort@...gle.com>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: mhiramat@...nel.org, linux-trace-kernel@...r.kernel.org, maz@...nel.org,
	oliver.upton@...ux.dev, kvmarm@...ts.linux.dev, will@...nel.org,
	qperret@...gle.com, kernel-team@...roid.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 00/13] Tracefs support for pKVM

On Tue, Jan 07, 2025 at 02:54:39PM -0500, Steven Rostedt wrote:
> 
> Hi Vincent,
> 
> Are you still working on this series? I was expecting an update.

Yes I am! I had actually a new version ready just before christmas but I thought
I'd better wait for the new year before sending it so it does not get lost in
your mailbox :)

Hopefully I'll send it this week!

> 
> -- Steve
> 
> 
> On Wed, 11 Sep 2024 10:30:16 +0100
> Vincent Donnefort <vdonnefort@...gle.com> wrote:
> 
> > The growing set of features supported by the hypervisor in protected
> > mode necessitates debugging and profiling tools. Tracefs is the
> > ideal candidate for this task:
> > 
> >   * It is simple to use and to script.
> > 
> >   * It is supported by various tools, from the trace-cmd CLI to the
> >     Android web-based perfetto.
> > 
> >   * The ring-buffer, where are stored trace events consists of linked
> >     pages, making it an ideal structure for sharing between kernel and
> >     hypervisor.
> > 
> > This series introduces a method to create events and to generate them
> > from the hypervisor (hyp_enter/hyp_exit given as an example) as well as
> > a Tracefs user-space interface to read them.
> > 
> > A presentation was given on this matter during the tracing summit in
> > 2022. [1]