linux-kernel - Re: [PATCH v2 05/17] clocksource/hyperv: use MSR-based access if running as root

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Date:   Thu, 12 Nov 2020 11:24:37 +0000
From:   Wei Liu <wei.liu@...nel.org>
To:     Daniel Lezcano <daniel.lezcano@...aro.org>
Cc:     Wei Liu <wei.liu@...nel.org>,
        Linux on Hyper-V List <linux-hyperv@...r.kernel.org>,
        virtualization@...ts.linux-foundation.org,
        Linux Kernel List <linux-kernel@...r.kernel.org>,
        Michael Kelley <mikelley@...rosoft.com>,
        Vineeth Pillai <viremana@...ux.microsoft.com>,
        Sunil Muthuswamy <sunilmut@...rosoft.com>,
        Nuno Das Neves <nunodasneves@...ux.microsoft.com>,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH v2 05/17] clocksource/hyperv: use MSR-based access if
 running as root

On Thu, Nov 12, 2020 at 10:56:17AM +0100, Daniel Lezcano wrote:
> On 05/11/2020 17:58, Wei Liu wrote:
> > Signed-off-by: Wei Liu <wei.liu@...nel.org>
> > ---
> 
> I would like to apply this patch but the changelog is too short (one line).
> 
> Please add a small paragraph (no need to resend just answer here, I will
> amend the log myself.

Please don't apply this to your tree. It is dependent on a previous
patch. I expect this series to go through the hyperv tree.

I will add in this small paragraph in a later version:

    When Linux runs as the root partition, the setup required for TSC page
    is different. Luckily Linux also has access to the MSR based
    clocksource. We can just disable the TSC page clocksource if Linux is
    the root partition.

If you're happy with the description, I would love to have an ack from
you. I will funnel the patch via the hyperv tree.

Wei.