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

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Message-ID: <2c5101fb-f3de-7b0c-ee76-e5a0e6b32098@linaro.org>
Date:   Thu, 12 Nov 2020 12:40:53 +0100
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Wei Liu <wei.liu@...nel.org>
Cc:     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 12/11/2020 12:24, Wei Liu wrote:
> 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>

Acked-by: Daniel Lezcano <daniel.lezcano@...aro.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.
> 


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