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

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Message-ID: <20201112155210.dwpzbyf6ytsmt2dh@liuwe-devbox-debian-v2>
Date:   Thu, 12 Nov 2020 15:52:11 +0000
From:   Wei Liu <wei.liu@...nel.org>
To:     Vitaly Kuznetsov <vkuznets@...hat.com>
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>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        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 04:30:57PM +0100, Vitaly Kuznetsov wrote:
> Wei Liu <wei.liu@...nel.org> writes:
> 
> > Signed-off-by: Wei Liu <wei.liu@...nel.org>
> 
> In the missing commit message I'd like to see why we don't use 'TSC
> page' clocksource for the root partition. My guess would be that it's
> not available and actually we're supposed to use raw TSC value (because
> root partitions never migrate) but please spell it out.

See my exchange with Daniel.

Wei.