linux-kernel - Re: [RFC 0/2] kvm: Use host timekeeping in guest.

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Date:   Fri, 20 Sep 2019 12:23:12 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Paolo Bonzini <pbonzini@...hat.com>
cc:     Suleiman Souhlal <suleiman@...gle.com>, rkrcmar@...hat.com,
        john.stultz@...aro.org, sboyd@...nel.org,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: Re: [RFC 0/2] kvm: Use host timekeeping in guest.

On Fri, 20 Sep 2019, Paolo Bonzini wrote:

> On 20/09/19 08:27, Suleiman Souhlal wrote:
> > To do that, I am changing kvmclock to request to the host to copy
> > its timekeeping parameters (mult, base, cycle_last, etc), so that
> > the guest timekeeper can use the same values, so that time can
> > be synchronized between the guest and the host.
> > 
> > Any suggestions or feedback would be highly appreciated.
> 
> I'm not a timekeeping maintainer, but I don't think the
> kernel/time/timekeeping.c changes are acceptable.

Indeed. #ifdef WHATEVERTHEHECK does not go anywhere. If at all this needs
to be a runtime switch, but I have yet to understand the whole picture of
this.

Thanks,

	tglx