linux-kernel - Re: [PATCH 00/11] arm64: ptdump: View the host stage-2 page-tables

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Date:   Sat, 30 Sep 2023 16:31:13 +0000
From:   Sebastian Ene <sebastianene@...gle.com>
To:     Marc Zyngier <maz@...nel.org>
Cc:     linux-kernel@...r.kernel.org, kernel-team@...roid.com,
        will@...nel.org, ryan.roberts@....com, mark.rutland@....com,
        vdonnefort@...gle.com
Subject: Re: [PATCH 00/11] arm64: ptdump: View the host stage-2 page-tables

On Fri, Sep 29, 2023 at 02:11:23PM +0100, Marc Zyngier wrote:

Hello Marc,

Thanks for having a look.

> Hi Sebastian,
> 
> On Wed, 27 Sep 2023 12:25:06 +0100,
> Sebastian Ene <sebastianene@...gle.com> wrote:
> > 
> > Hi,
> > 
> > This can be used as a debugging tool for dumping the host stage-2
> > page-tables under pKVM envinronment.
> 
> Why only pKVM? Why only the host? Dumping page tables shouldn't be
> reserved to this corner case. Specially considering that pKVM is still
> really far away from being remotely useful upstream.
>

I wanted to publish the initial series which adds support for the host
and then extend it to guest VMs. 

> I'd really expect this sort of debugging information to be fully
> available for both host and guest, for all modes (nVHE, VHE, hVHE,
> protected, nested), without limitations other than the configuration
> option.

I agree, let me re-spin the series and add support for non-protected as
well.

> 
> Also, please Cc the relevant parties (I'm the only one Cc'd on the KVM
> side...)
>

Thanks,

Sebastian

> Thanks,
> 
> 	M.
> 
> -- 
> Without deviation from the norm, progress is not possible.