linux-kernel - Re: [PATCH 05/10] x86: jailhouse: Set up timekeeping

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Message-ID: <alpine.DEB.2.20.1711172345220.2186@nanos>
Date:   Fri, 17 Nov 2017 23:49:41 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Jan Kiszka <jan.kiszka@...mens.com>
cc:     Ingo Molnar <mingo@...hat.com>, "H . Peter Anvin" <hpa@...or.com>,
        x86@...nel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        jailhouse-dev@...glegroups.com
Subject: Re: [PATCH 05/10] x86: jailhouse: Set up timekeeping

On Thu, 16 Nov 2017, Jan Kiszka wrote:
> Calibrate the TSC and, where necessary, the APIC timer against the
> TMTIMER. We need our own implementation as neither the PIC nor the HPET
> are available, and the standard calibration routines try to make use of
> them.

Why is this needed at all?

The host the frequency already. So this can be done w/o pmtimer and extra
calibration routine.

Thanks,

	tglx